CN109826578B

CN109826578B - Safety type natural gas hydrate rotary pressure maintaining coring device

Info

Publication number: CN109826578B
Application number: CN201910156605.2A
Authority: CN
Inventors: 秦绪文; 叶建良; 邱海峻; 谢文卫; 卢秋平; 梁金强; 张伟; 寇贝贝; 匡增桂; 熊亮; 申凯翔; 李彬; 陈靓
Original assignee: Guangzhou Marine Geological Survey
Current assignee: Guangzhou Marine Geological Survey
Priority date: 2019-03-01
Filing date: 2019-03-01
Publication date: 2023-10-27
Anticipated expiration: 2039-03-01
Also published as: CN109826578A

Abstract

The invention relates to a safe type natural gas hydrate rotary pressure maintaining coring device, which comprises an outer tube assembly and an inner tube assembly arranged in the outer tube assembly, wherein the bottom end of the outer tube assembly is provided with a drill bit; the inner pipe assembly comprises an inner pipe assembly a and an inner pipe assembly b, wherein the inner pipe assembly b is arranged in the inner pipe assembly a and can axially move along the inner pipe assembly a, and the inner pipe assembly a comprises a salvaging spearhead, a flick mechanism, a piston pipe, a middle pipe nipple, a sealing nipple, an energy accumulator connecting pipe, a middle pipe and a pressure maintaining ball valve overturning sealing mechanism which are sequentially connected from top to bottom; the inner pipe assembly b comprises a lifting device, a connecting mechanism, a spring clip hanging mechanism, a single-acting mechanism, an adapter, an adjusting joint, an energy accumulator connecting pipe, a sealing mechanism, a temperature and pressure instrument connecting pipe, a core barrel connecting nipple and a core barrel which are sequentially connected from top to bottom. The invention is safe rotary pressure maintaining sampling, can adapt to the fourth series sedimentary stratum and bedrock, and is more reliable in application.

Description

Safety type natural gas hydrate rotary pressure maintaining coring device

Technical Field

The invention relates to the technical field of drilling, in particular to a natural gas hydrate rotary pressure maintaining coring device for natural gas hydration.

Background

The natural gas hydrate is a high-efficiency clean energy source with abundant resources, is a strategic high point of future global energy development, is reserved below the Liu Pohai bottom of the deep sea or buried in sediments in polar regions, and is required to be collected in a pressure maintaining mode because the natural gas hydrate is required to be kept stable in a stable pressure maintaining state and is not decomposed. The method that the shear pin shears to trigger the core barrel to be pulled out of the pressure maintaining ball valve and then the ball valve is closed is adopted, and the shear pin works unstably and shears due to collision and impact in the process of putting the core barrel. Once the bolt is sheared by impact, the inner tube assembly of the coring device is easily released in advance, and then the ball valve is closed in advance to cause coring failure, so that the coring device using the shearing pin is poor in reliability and safety. Therefore, the core extractor with good pressure maintaining effect and reliable operation is an urgent problem to be solved in the field.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a safe type natural gas hydrate rotary pressure-maintaining coring device which can realize pressure-maintaining coring, has high reliability and safety and high coring success rate, and can be suitable for coring of hard stratum.

The technical scheme of the invention is as follows: the rotary pressure maintaining coring device for the safe natural gas hydrate comprises an outer pipe assembly and an inner pipe assembly arranged in the outer pipe assembly, wherein a drill bit is arranged at the bottom end of the outer pipe assembly;

the inner pipe assembly comprises an inner pipe assembly a and an inner pipe assembly b, wherein the inner pipe assembly a comprises a salvaging spearhead, a spring clamping mechanism, a piston pipe, a middle pipe nipple, a sealing nipple, an energy accumulator connecting pipe, a middle pipe and a pressure maintaining ball valve overturning sealing mechanism which are sequentially connected from top to bottom; the inner pipe assembly b comprises a lifting device, a connecting mechanism, a spring clip hanging mechanism, a single-acting mechanism, an adapter, an adjusting joint, an energy accumulator connecting pipe, a sealing mechanism, a temperature and pressure instrument connecting pipe, a core barrel connecting nipple and a core barrel which are sequentially connected from top to bottom; the lower part of the spring clip hanging mechanism is arranged in the middle pipe nipple, and the salvaging spearhead is used for driving the spring clip hanging mechanism to move in a direction away from the middle pipe nipple; the inner tube assembly b is axially fixed inside the inner tube assembly a through the spring clamping hanging mechanism, and can axially move upwards along the inner tube assembly a when in a clamping-off state, wherein the clamping-off state is as follows: the spring clip hanging mechanism is separated from the middle pipe nipple;

the bullet clamping mechanism and the bullet clamping hanging mechanism are mutually matched, so that the core barrel is axially fixed before fishing and coring;

The core barrel is positioned in the middle pipe;

the pressure maintaining ball valve overturning sealing mechanism comprises a spring limiting ring, a ball valve driving nipple, a spring, a ball valve driving nipple spring shoulder, a ball valve pipe shoulder, an upper ball valve seat sealing ring, an upper ball valve seat, a ball valve pipe, a ball valve overturning driving bolt, a ball valve shaft, a ball valve overturning sliding groove, a ball valve pipe slotted hole, a ball valve pipe window, a lower ball valve seat sealing ring, a bearing spring and a ball valve lower gland; the ball valve is provided with a ball valve shaft and a ball valve overturning sliding groove, and is provided with a through hole for the core barrel to pass through;

the upper end of the ball valve pipe is connected with the lower end of the middle pipe, the ball valve pipe sealing ring is arranged at the joint of the ball valve pipe and the middle pipe, a ball valve pipe window is arranged in the hollow of the ball valve pipe, a ball valve pipe oblong hole is arranged in the middle of the ball valve pipe, a ball valve overturning driving bolt positioned in the ball valve pipe oblong hole is fixed on the ball valve pipe, and the ball valve overturning driving bolt extends into a ball valve overturning sliding groove on the ball valve;

the ball valve is fixedly arranged in a ball valve pipe window on the ball valve pipe through a ball valve shaft, one end of the ball valve shaft is connected with the ball valve, and the other end of the ball valve shaft extends into the long round hole of the ball valve pipe and can rotate and slide in the long round hole of the ball valve pipe;

An upper ball valve seat and a lower ball valve seat are arranged in the ball valve pipe, the upper ball valve seat and the lower ball valve seat can axially slide in the ball valve pipe, a ball valve pipe shoulder is arranged at the upper end of the ball valve pipe, and the ball valve pipe is connected with the middle pipe;

the upper end of the upper ball valve seat is connected with the lower end of the ball valve driving nipple, the lower end of the upper ball valve seat is in contact with the upper end of the ball valve, the ball valve driving nipple is positioned below the core barrel connecting nipple, the ball valve driving nipple is positioned between the core barrel and the middle pipe, a spring is further arranged between the ball valve driving nipple and the middle pipe, the spring is sleeved on the ball valve driving nipple, the upper end of the spring is in contact with a spring limiting ring, the spring limiting ring is limited by a middle pipe shoulder through concave-convex fit, the spring limiting ring is positioned between the core barrel and the middle pipe, the lower end of the spring is in contact with the ball valve driving nipple spring and is propped by a ball valve driving nipple spring shoulder, the ball valve driving nipple spring shoulder is propped against the spring limiting ring through the spring, and the ball valve driving nipple spring shoulder is positioned above the ball valve pipe shoulder;

the pressure maintaining ball valve overturning sealing mechanism is matched with the core barrel to realize that the ball valve slides downwards and overturns by 90 degrees;

the single-acting mechanism is positioned in the middle pipe nipple and below the elastic pin nipple, the single-acting mechanism is connected with the adapter through a bearing sleeve, the adapter is connected with the upper end of the adjusting connector, the adjusting connector is sleeved with an adjusting mechanism locking nut, the adjusting mechanism locking nut is arranged at the lower end of the adapter, the adjusting connector is positioned in the connecting pipe, the lower end of the adjusting connector is connected with the upper end of the connecting pipe, and the lower end of the connecting pipe is connected with the sealing mechanism; the sealing mechanism is positioned inside the middle tube and can move axially along the middle tube;

The connecting mechanism is arranged in the piston tube and comprises an upper part and a lower part, wherein the upper part comprises a joint, a joint inner cavity, a piston inner cavity shoulder, a piston inner cavity guide hole and an elastic bolt pulling hole, and the lower part comprises a bolt positioning cylinder, a first bolt sliding hole, a bolt spring, a sliding bolt, a spring compression ring, a supporting spring, an inserted connecting rod, a connecting rod spring shoulder and a second bolt sliding hole;

the upper end of the connector is connected with the lower end of the extension tube, the upper part of the connector is positioned in the bracket tube, the upper end of the extension tube is connected with the lower end of the lifting tube, the lower part of the extension tube is provided with an extension tube water outlet, and the extension tube water outlet is positioned above the connector; the lower end of the connector is connected with the piston, the connector is provided with a connector inner cavity, the bottom of the piston is provided with a transversely arranged elastic bolt pulling hole, the lower part of the elastic bolt pulling hole is provided with a piston inner cavity guide hole and a piston inner cavity shoulder, the piston inner cavity guide hole is provided with an axial channel, the outer wall of the piston inner cavity guide hole is in contact with the inner wall of the piston pipe, the piston inner cavity shoulder is positioned at the top of the piston inner cavity guide hole, the bottom of the piston pipe is provided with a piston pipe water outlet, the piston pipe water outlet is positioned below the elastic bolt pulling hole, and the lower end of the piston inner cavity guide hole is connected with a spring compression ring;

The inserted connecting rod sequentially passes through an axial channel formed by the spring compression ring and the guide hole 2 of the piston inner cavity and then extends into the joint inner cavity of the joint, the lower end of the inserted connecting rod is provided with a connecting rod spring shoulder, the lower part of the inserted connecting rod is sleeved with a supporting spring, and the supporting spring is positioned between the spring compression ring and the connecting rod spring shoulder;

the upper part of the inserted connecting rod is provided with a second bolt sliding hole which is transversely arranged, a bolt positioning cylinder and a sliding bolt which are transversely arranged are arranged in the second bolt sliding hole, a first bolt sliding hole is arranged in the bolt positioning cylinder, the sliding bolt comprises a body arranged in the second bolt sliding hole and an extension part arranged outside the inserted connecting rod, a bolt spring is sleeved on the body of the sliding bolt, the body of the sliding bolt stretches into the first bolt sliding hole and can transversely move along the first bolt sliding hole, and the aperture of the bolt spring is larger than that of the first bolt sliding hole;

when the sliding bolt reaches the uplink limit position, the extension part of the sliding bolt stretches into the elastic bolt pulling hole; when the piston reaches the descending limit position, the water outlet of the piston pipe is positioned above the piston and communicated with the water outlet of the distributing pipe.

Further, when the core barrel passes through the through hole of the ball valve downwards, the edge of the ball valve is tightly attached to the core barrel, the core barrel limits the ball valve to turn downwards, meanwhile, the ball valve is contacted by the core barrel to enable the ball valve to upwards prop against the upper ball valve seat, and the spring limiting ring is limited by the middle pipe shoulder on the lower middle pipe; when the core barrel is lifted out from the through hole of the ball valve, the ball valve is separated from the core barrel and turned over by 90 degrees, and the ball valve reaches the lower limit position, the bearing spring is compressed until the lower ball valve seat is contacted with the lower gland of the ball valve.

Further, the lower end connection of pressurize ball valve upset sealing mechanism is equipped with the washing mechanism that washes the core barrel, and washing mechanism is equipped with the runner that goes out, goes out the runner and is outer tube drill bit and well pipe drill bit clearance and core barrel and well pipe drill bit clearance.

Further, sealing mechanism is including inserting check valve pressure measurement joint soon, pressure channel, sealing joint sealing washer, sealing joint and sealing joint circular bead, and sealing joint's upper end is connected with the lower extreme of energy storage ware connecting pipe, and sealing joint middle part is equipped with axial pressure channel, inserts the check valve pressure measurement joint soon and stretches into in the pressure channel, and the sealing joint top cover is equipped with sealing joint sealing washer, and sealing joint both sides are equipped with sealing joint circular bead, and sealing joint's lower extreme is connected with the upper end of warm-pressing appearance connecting pipe.

Further, an upper ball valve seat sealing ring is arranged at the joint of the ball valve pipe and the upper ball valve seat, and a lower ball valve seat sealing ring is arranged at the joint of the ball valve pipe and the lower ball valve seat; the lower ball valve seat is provided with a bearing spring and a ball valve lower gland from top to bottom, the upper end and the lower end of the bearing spring are respectively connected with the lower ball valve seat and the ball valve lower gland, and the upper end of the lower ball valve seat is contacted with the lower end of the ball valve.

Further, the ball valve is in floating contact with the lower ball valve seat.

Further, bullet card mechanism includes bullet card a, bullet card bracket a, takes off card pipe, water inlet, bullet card bracket pipe long pinhole, bullet card bracket pipe a, takes off card pipe tilting part, bullet card a sets up in the bullet card is indoor, and is connected with bullet card bracket a, bullet card room sets up the inner wall at the outer tube assembly, bullet card bracket a connects and sets up inside taking off the card pipe, takes off card pipe and salvage spearhead fixed connection, take off the bottom of card pipe and be equipped with and be used for taking off the bullet card from taking off the card pipe tilting part that the card comes out of bullet card room, take off and be equipped with the water inlet on taking off the lateral wall of card pipe, bullet card bracket pipe long pinhole sets up in the interior intracavity portion of bullet card bracket pipe a.

Further, the lifting device comprises a lifting pipe, a lifting pipe long pin hole and a first elastic pin, wherein the lifting pipe long pin hole is formed in the lifting pipe; the first elastic pin penetrates through the long pin hole of the elastic clamping bracket tube and the long pin hole of the lifting tube and then is fixedly arranged on the clamping removing tube, the central axes of the long pin hole of the elastic clamping bracket tube and the long pin hole of the lifting tube are on the same straight line, and the lifting tube, the elastic clamping bracket tube a and the clamping removing tube are connected in a sleeved mode.

Further, the card ejection hanging mechanism comprises a card ejection bracket b, a card removing pipe b, a card ejection cavity, a spring piece opening, a card ejection cavity, a card ejection b, a card ejection bracket nipple and a card removing pipe inclined part b; the upper portion of bullet card suspension mechanism sets up in the inside of piston tube, and the salvage spearhead is used for driving the inclined part b of taking off the card pipe and moves towards the direction that is close to bullet card b for bullet card b breaks off with the contact of well pipe nipple joint.

Further, the single acting mechanism comprises an upper thrust bearing, a mandrel, a copper sleeve, a bearing jacket, a lower thrust bearing and a lock nut, wherein the upper end of the mandrel is in threaded connection with the bottom end of the elastic pin nipple, the bearing jacket is sleeved on the mandrel, the copper sleeve is arranged between the bearing jacket and the mandrel, the upper end and the lower end of the copper sleeve are respectively provided with the upper thrust bearing and the lower thrust bearing, the lock nut is arranged at the bottom end of the mandrel, and the lower thrust bearing is positioned above the lock nut.

The beneficial effects of the invention are as follows: the invention has the following beneficial technical effects:

1. the ball valve of the pressure maintaining ball valve overturning sealing mechanism is informed to slide downwards and overturn by 90 degrees, the ball valve is in sealing contact with the upper ball valve seat, the pressure maintaining effect of the upper area of the ball valve is achieved, at the moment, the core barrel is located in the pressure maintaining area above the ball valve, the coring sample in the core barrel is in a pressure maintaining state, the pressure maintaining sampling of the coring device is achieved, and the coring success rate is improved;

In addition, the pressure-maintaining ball valve overturning sealing mechanism for realizing 90 degrees of ball valve overturning is realized through the spring and the ball valve driving nipple, so that the structure of the pressure-maintaining ball valve overturning sealing mechanism is greatly simplified, the use and the operation are simpler and more convenient, the reliability is greatly improved, and the subsequent maintenance is also faster and more convenient;

2. the core sample coring is carried out by matching the drill bit and the middle pipe drill bit, and the double-drill-bit coring mode is adopted, so that the method can adapt to a fourth-system sedimentary stratum and bedrock, and the application range is wider;

3. through the mutual matching of the spring clamping mechanism and the spring clamping hanging mechanism, the axial fixing of the core barrel and the single action effect of maintaining the core barrel are realized before the core taking by fishing, namely, the rotary core taking is realized, and the method is simple and quick;

4. the fragile parts such as the shear pins are not used any more, the upper part and the lower part of the connecting mechanism are not fixedly connected before the coring device is put in and put in the outer tube assembly to sit the card, the connection is realized through the hydraulic thrust of slurry in the coring process, and when the coring device is salvaged after the coring, the upper part and the lower part of the connecting mechanism are fixedly connected, the control and the card release of the b spring card hanging mechanism of the inner tube assembly are realized, the ball valve is not closed in advance before the coring is finished, and the safety, the reliability and the success rate of the coring device are further improved.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is an enlarged schematic view of the area A of FIG. 1;

FIG. 3 is an enlarged schematic view of the section B of FIG. 1;

FIG. 4 is an enlarged schematic view of the area C of FIG. 1;

FIG. 5 is an enlarged schematic view of the section D of FIG. 1;

FIG. 6 is an enlarged schematic view of the area E of FIG. 1;

fig. 2 to 6 are schematic views of sectional structures constituting fig. 1, the lower end of fig. 2 being connected to the upper end of fig. 3, the lower end of fig. 3 being connected to the upper end of fig. 4, the lower end of fig. 4 being connected to the upper end of fig. 5, and the lower end of fig. 5 being connected to the upper end of fig. 6;

FIG. 7 is an enlarged schematic view at A' in FIG. 3;

FIG. 8 is a schematic structural view of an outer tube assembly;

FIG. 9 is a schematic structural view of the inner tube assembly;

FIG. 10 is a schematic view of the construction of the inner tube assembly a;

FIG. 11 is a schematic structural view of the inner tube assembly b;

FIG. 12 is one of the schematic diagrams of the state in the process of salvaging and unclamping after the coring is completed (the first elastic pin reaches the top end of the long pin hole of the lifting pipe);

FIG. 13 is a schematic diagram of a state in the process of salvaging and releasing the card after the core is taken out (the card-ejecting suspension mechanism completes the releasing action);

FIG. 14 is an enlarged schematic view at A in FIG. 13;

FIG. 15 is one of the schematic views of the state during the ball valve flip (core barrel has been pulled out of the ball valve through hole);

FIG. 16 is an enlarged schematic view at B in FIG. 15;

FIG. 17 is an enlarged schematic view at C in FIG. 15;

FIG. 18 is an enlarged schematic view at D in FIG. 15;

FIG. 19 is an enlarged schematic view at E in FIG. 15;

FIG. 20 is a schematic view of the cross-sectional structure of line A-A1 of FIG. 2;

FIG. 21 is a schematic view of the sectional structure of line B-B1 in FIG. 6;

FIG. 22 is a schematic view of a partial structure of the sliding bolt when it reaches the upper limit position;

in the drawing the view of the figure, 10-outer tube assembly, 20-inner tube assembly, 201-inner tube assembly a, 202-inner tube assembly b, 110-bullet clamping chamber, 120-seat ring, 130-centralizing ring, 140-outer tube drill bit, 141-torque transmission shoulder, 21-salvage spearhead, 22-bullet clamping mechanism, 221-bullet clamping a, 222-bullet clamping bracket a, 223-stripping tube, 224-bullet clamping bracket tube long pin hole, 225-water inlet, 226-bullet clamping bracket tube a, 227-stripping tube inclined part, 23-lifting device, 231-lifting tube long pin hole, 232-lifting tube, 233-first elastic pin, 24-hanging ring, 25-distributing tube, 251-distributing tube water outlet, 26-connecting mechanism, 261-connector, 2611-connector inner chamber, 262-piston 2621-piston inner chamber shoulder, 2622-piston inner chamber guide hole, 2623-spring bolt pull hole, 263-bolt positioning cylinder, 2631-first bolt sliding hole, 264-bolt spring, 265-sliding bolt, 266-spring press ring, 267-supporting spring, 268-insertion connecting rod, 2681-connecting rod spring shoulder, 2682-second bolt sliding hole, 27-card ejection hanging mechanism, 271-card ejection bracket b, 272-card release tube b, 273-card ejection cavity, 274-card ejection hole, 275-card ejection cavity, 276-card ejection b, 277-card release tube inclined portion b, 28-base block, 29-card ejection bracket nipple, 291-seat shoulder, 292-spring pin slotted hole, 293-second spring pin, 30-middle pipe nipple, 301-middle pipe nipple shoulder, 31-single acting mechanism, 311-upper thrust bearing, 312-bearing housing, 313-copper housing, 314-lower thrust bearing, 315-spindle, 316-lock nut, 32-adapter, 33-adjustment mechanism lock nut, 34-adjustment joint, 35-seal nipple, 351-seal nipple shoulder, 36-accumulator connection pipe, 37-accumulator, 38-seal mechanism, 381-quick-insert check valve pressure tap, 382-pressure channel, 383-seal joint seal ring, 384-seal joint shoulder, 385-seal joint, 40-check ball valve cavity, 41-ball valve seat, 42-check ball valve, 43-thermometer connection pipe, 44-thermometer test chamber 46-core barrel connecting nipple, 47-core barrel, 48-middle barrel, 481-middle barrel shoulder, 49-pressure maintaining ball valve overturning sealing mechanism, 4901-spring limiting ring, 4902-ball valve driving nipple, 4903-spring, 4904-ball valve driving nipple spring shoulder, 4905-ball valve barrel shoulder, 4906-upper ball valve seat sealing ring, 4907-upper ball valve seat, 4908-ball valve pipe, 4909-ball valve, 4910-ball valve shaft, 4911-ball valve overturning sliding groove, 4912-ball valve overturning driving bolt, 4913-ball valve pipe slotted hole, 4914-ball valve pipe window, 4915-lower ball valve seat, 4916-lower ball valve seat sealing ring, 4917-bearing spring, 4918-ball valve lower gland, 50-piston pipe, 501-piston pipe water outlet, 51-flushing water inlet, 52-flushing water outlet, 53-torque transmission spline, 54-water outlet, 55-petal blocking spring and 56-middle tube drill bit.

Detailed Description

The invention will be further described with reference to the accompanying drawings and detailed description below:

as shown in fig. 1 to 22, a safety type natural gas hydrate rotary pressure maintaining coring device comprises an outer tube assembly 10 and an inner tube assembly 20, wherein the inner tube assembly 20 is arranged in the outer tube assembly 10, a spring clamping chamber 110, a seat ring 120 and a centralizing ring 130 are sequentially arranged on the inner wall of the outer tube assembly 10 from top to bottom, and a drill bit is arranged at the bottom end of the outer tube assembly 10;

the inner pipe assembly 20 comprises an inner pipe assembly a 201 and an inner pipe assembly b 202, the inner pipe assembly b 202 is arranged in the inner pipe assembly a 201 and can axially move along the inner pipe assembly a 201, and the inner pipe assembly a 201 comprises a fishing spearhead 21, a bullet clamping mechanism 22, a piston pipe 50, a middle pipe nipple 30, a sealing nipple 35, an energy accumulator connecting pipe 36, a middle pipe 48 and a pressure maintaining ball valve overturning sealing mechanism 49 which are sequentially connected from top to bottom; the inner pipe assembly b 202 comprises a lifting device 23, a connecting mechanism 26, a spring clip hanging mechanism 27, a single-acting mechanism 31, an adapter 32, an adjusting joint 34, an energy accumulator connecting pipe 36, a sealing mechanism 38, a temperature and pressure instrument connecting pipe 43, a core barrel connecting nipple 46 and a core barrel 47 which are sequentially connected from top to bottom;

The salvaging spearhead 21, the spring clamping mechanism 22, the piston pipe 50, the middle pipe nipple 30, the sealing nipple 35, the energy accumulator connecting pipe 36, the middle pipe 48 and the ball valve pipe 4908 on the pressure maintaining ball valve overturning sealing mechanism 49 are all in threaded connection or an integrated structure; the lifting device 23, the connecting mechanism 26 and the spring clip hanging mechanism 27, as well as the single acting mechanism 31, the conversion joint 32, the adjusting joint 34, the energy accumulator connecting pipe 36, the sealing mechanism 38, the temperature and pressure instrument connecting pipe 43, the core barrel connecting nipple 46 and the core barrel 47 are all connected by screw threads, an integrated structure or other fixed connection modes, such as stable clamping, buckling, welding and other connection modes;

the outer wall of the nipple (not shown) of the center tube bit 56 is in contact, preferably sealed contact, with the inner wall of the centralizer ring 130 and no drilling fluid can pass through;

the card ejection mechanism 22 comprises a card ejection a 221, a card ejection bracket a 222, a card release pipe 223, a water inlet 225, a card ejection bracket pipe long pin hole 224, a card ejection bracket pipe a 226 and a card release pipe inclined part 227, wherein the card ejection a 221 is arranged in the card ejection chamber 110 and is connected with the card ejection bracket a 222, the card ejection bracket a 222 is connected and arranged in the card release pipe 223, the card release pipe 223 is fixedly connected with a salvage spear 21, the bottom end of the card release pipe 223 is provided with a card release pipe inclined part 227 for releasing a card from the card ejection chamber 110, the side wall of the card release pipe 223 is provided with the water inlet 225, and the card ejection bracket pipe long pin hole 224 is arranged in the middle cavity of the card ejection bracket pipe a 226;

The lifting device 23 comprises a lifting pipe 232, a lifting pipe long pin hole 231 and a first elastic pin 233, wherein the lifting pipe long pin hole 231 is arranged in the lifting pipe 232;

the first elastic pin 233 arranged in the inner pipe assembly a 201 is fixedly arranged on the releasing pipe 223 after penetrating through the long pin hole 224 of the elastic clamping bracket pipe and the long pin hole 231 of the lifting pipe, and as the central axes 315 of the long pin hole 224 of the elastic clamping bracket pipe and the long pin hole 231 of the lifting pipe are on the same straight line, the first elastic pin 233 can slide freely in the long pin hole 224 of the elastic clamping bracket pipe and the long pin hole 231 of the lifting pipe at the same time, so that the sleeved connection among the lifting pipe 232, the elastic clamping bracket pipe a 226 and the releasing pipe 223 is realized, and the connection between the lifting device 23 and the elastic clamping mechanism 22 is realized;

the upper part of the lifting tube 232 is arranged inside the card spring bracket tube a 226 and can axially move along the card spring bracket tube a 226, and the lower part is arranged inside the piston tube 50; the top end of the lifting tube 232 is positioned below the long pin hole 224 of the spring clip bracket tube;

the piston tube 50 is provided with a piston tube water outlet 501 which is obliquely arranged, the upper end of the piston tube 50 is connected with the lower end of the spring clip bracket tube a 226, the lower end of the piston tube 50 is connected with the upper end of the middle tube nipple 30, and the middle tube nipple 30 is provided with a middle tube nipple shoulder 301;

The connection part of the spring clip bracket tube a 226 and the piston tube 50 is provided with a suspension ring 24, the suspension ring 24 is seated on the seat ring 120, and the inner tube assembly 20 is suspended and installed inside the outer tube assembly 10 through the suspension ring 24, namely, the weight of the whole inner tube assembly 20 is placed on the outer tube assembly 10;

the connection mechanism 26 provided inside the piston tube 50 includes an upper portion including a joint 261, a joint inner chamber 2611, a piston 262, a piston inner chamber shoulder 2621, a piston inner chamber guide hole 2622, and an elastic plug pull hole 2623, and a lower portion including a plug positioning cylinder 263, a first plug sliding hole 2631, a plug spring 264, a sliding plug 265, a spring pressing ring 266, a support spring 267, an insertion connection rod 268, a connection rod spring shoulder 2681, and a second plug sliding hole 2682;

the upper end of the joint 261 of the connecting mechanism 26 is connected with the lower end of the extension tube 25, the joint 261 is positioned in the extension tube 25, the upper end of the extension tube 25 is connected with the lower end of the lifting tube 232, the lower part of the extension tube 25 is provided with an extension tube water outlet 251, and the extension tube water outlet 251 is positioned above the joint 261; the lower end of the joint 261 is connected with the piston 262, the joint 261 is provided with a joint inner chamber 2611, the bottom of the piston 262 is provided with a transversely arranged elastic plug pulling hole 2623, the lower part of the elastic plug pulling hole 2623 is provided with a piston inner chamber guide hole 2622 and a piston inner chamber shoulder 2621, the piston inner chamber guide hole 2622 is in a horn shape with a narrow upper part and a wide lower part, the left and the right are respectively axially arranged in the piston tube 50, the left and the right piston inner chamber guide holes 2622 form an axial channel, the outer wall of the piston inner chamber guide hole 2622 is contacted with the inner wall of the piston tube 50, the piston inner chamber shoulder 2621 is positioned at the top of the piston inner chamber guide hole 2622, the bottom of the piston tube 50 is provided with a piston tube water outlet 501, the piston tube water outlet 501 is contacted with the outer wall of the piston inner chamber guide hole 2622, namely the piston tube water outlet 501 is positioned below the elastic plug pulling hole 2623, and the lower end of the piston inner chamber guide hole 2622 is connected with the spring pressing ring 266;

The inserted connecting rod 268 sequentially passes through the axial channel formed by the spring pressing ring 266 and the piston inner chamber guide hole 2622 and then extends into the joint inner chamber 2611 of the joint 261, a connecting rod spring shoulder 2681 is arranged at the lower end of the inserted connecting rod 268, a supporting spring 267 is sleeved at the lower part of the inserted connecting rod 268, and the supporting spring 267 is positioned between the spring pressing ring 266 and the connecting rod spring shoulder 2681, so that the expansion range of the supporting spring 267 is between the spring pressing ring 266 and the connecting rod spring shoulder 2681;

the upper portion of the insertion connecting rod 268 is provided with a second bolt sliding hole 2682 which is transversely arranged, a bolt positioning cylinder 263 and a sliding bolt 265 which are transversely arranged are arranged in the second bolt sliding hole 2682, a first bolt sliding hole 2631 is arranged in the bolt positioning cylinder 263, the sliding bolt 265 comprises a body which is arranged in the second bolt sliding hole 2682 and an extension part which is arranged outside the insertion connecting rod 268, namely the extension part extends out of the insertion connecting rod 268, a bolt spring 264 is sleeved on the body of the sliding bolt 265, the body of the sliding bolt 265 extends into the first bolt sliding hole 2631 and can transversely move along the first bolt sliding hole 2631, the aperture of the bolt spring 264 is larger than that of the first bolt sliding hole 2631, and the bolt spring 264 cannot extend into the first bolt sliding hole 2631 and is limited by the bolt positioning cylinder 263, namely the whole bolt spring 264 is positioned in the second bolt sliding hole 2682;

The card ejection hanging mechanism 27 comprises a card ejection bracket b 271, a card removing pipe b 272, a card ejection cavity 273, a card ejection opening 274, a card ejection cavity 275, a card ejection b 276, a card ejection bracket nipple 29 and a card removing pipe inclined portion b 277;

the upper part of the spring clip hanging mechanism 27 is arranged in the piston tube 50, and the lower part is arranged in the middle tube nipple 30;

the disengaging pipe b 272 is arranged in the piston pipe 50, the upper end of the disengaging pipe b 272 is connected with the lower end of the inserting connecting rod 268, the lower end of the disengaging pipe b 272 is provided with a disengaging pipe inclined part b 277 for disengaging the elastic clamping b 276 from the elastic clamping cavity 275, the disengaging pipe inclined part b 277 is arranged in the middle pipe nipple 30, a spring plate opening 274 is further arranged between the disengaging pipe inclined part b 277 and the disengaging pipe b 272, an elastic clamping bracket b 271 is transversely arranged in the disengaging pipe b 272, an elastic clamping cavity 273 is arranged below the elastic clamping bracket b 271, two elastic clamping b 276 are arranged below the elastic clamping cavity 273, the upper ends of the two elastic clamping b 276 are fixed on the elastic clamping cavity 273 through a connecting piece (not shown in the drawing), the two elastic clamping b 276 are positioned in the elastic clamping cavity 275, the elastic clamping cavity 275 is positioned in the middle pipe nipple 30, the lower end of the elastic clamping b 276 is arranged on a lower base block 28, the base block 28 is arranged in the middle pipe nipple 30, and the elastic clamping nipple b cannot move axially upwards in the middle pipe nipple 30 even if the elastic clamping cavity 276 is not axially stretched out of the elastic clamping cavity 276;

In the present embodiment, all of the "upward" means an upward direction toward the salvaging spearhead 21, and the "downward" means a downward direction downward from the salvaging spearhead 21;

a spring clip bracket short joint 29 is arranged below the base block 28, and the upper part of the spring clip bracket short joint 29 is positioned in the inclined part b 277 of the clip removing pipe;

in this embodiment, the cartridge holder nipple 29 and the cartridge holder b 271 are of one integral structure;

the elastic clamping bracket nipple 29 is internally provided with an axially arranged elastic pin slotted hole 292, a second elastic pin 293 is arranged in the elastic pin slotted hole 292, the second elastic pin 293 penetrates through the elastic pin slotted hole 292 and the elastic clamping bracket nipple 29 and is fixedly arranged on the pipe-disengaging inclined part b 277, and the second elastic pin 293 can freely slide in the elastic pin slotted hole 292;

the inclined part b 277 of the card removing pipe is located on the locating shoulder 291 of the short joint 29 of the card ejecting bracket, so that the inclined part b 277 of the card removing pipe can move upwards relative to the short joint 29 of the card ejecting bracket axially;

the lower part of the bullet card bracket nipple 29 is positioned in the middle pipe nipple 30 and is located on a middle pipe nipple shoulder 301 of the middle pipe nipple 30, so that the bullet card bracket nipple 29 is propped by the middle pipe nipple 30 and cannot move downwards axially, and further the bullet card hanging mechanism 27 cannot move downwards axially;

The inside of the middle pipe nipple 30 is also provided with a single-acting mechanism 31, and the single-acting mechanism 31 is positioned below the bullet card bracket nipple 29;

the single-acting mechanism 31 comprises an upper thrust bearing 311, a mandrel 315, a copper sleeve 313, a bearing jacket 312, a lower thrust bearing 314 and a lock nut 316, wherein the upper end of the mandrel 315 is in threaded connection with the bottom end of the bullet card bracket pup joint 29, the bearing jacket 312 is sleeved on the mandrel 315, the copper sleeve 313 is arranged between the bearing jacket 312 and the mandrel 315, the upper end and the lower end of the copper sleeve 313 are respectively provided with the upper thrust bearing 311 and the lower thrust bearing 314, the bottom end of the mandrel 315 is provided with the lock nut 316, and the lower thrust bearing 314 is positioned above the lock nut 316;

the single-acting mechanism 31 is connected with the adapter 32 through a bearing jacket 312, the adapter 32 is connected with the upper end of the adjusting joint 34, the adjusting joint 34 is sleeved with an adjusting mechanism locking nut 33, the adjusting mechanism locking nut 33 is arranged at the lower end of the adapter 32, the adjusting joint 34 is positioned in the accumulator connecting pipe 36, the lower end of the adjusting joint 34 is connected with the upper end of the accumulator connecting pipe 36, and the lower end of the accumulator connecting pipe 36 is connected with the sealing mechanism 38;

the single-acting mechanism 31 prevents the core tube 47 from rotating along with the outer tube assembly 10, so that the core is prevented from being worn;

The sealing mechanism 38 includes a quick-connect check valve pressure tap 381, a pressure channel 382, a sealing tap seal ring 383, a sealing tap 385 and a sealing tap shoulder 384,

the upper end of the sealing joint 385 is connected with the lower end of the accumulator connecting pipe 36, an axial pressure channel 382 is arranged in the middle of the sealing joint 385, a quick-insertion one-way valve pressure measuring joint 381 extends into the pressure channel 382, a sealing joint sealing ring 383 is sleeved on the sealing joint 385, sealing joint shoulders 384 are arranged on two sides of the sealing joint 385, and the lower end of the sealing joint 385 is connected with the upper end of the temperature and pressure meter connecting pipe 43, preferably in threaded connection;

the sealing mechanism 38 is located inside the accumulator connecting pipe 36 and can move axially along the accumulator connecting pipe 36, when the sealing mechanism 38 reaches an uplink limit position, the sealing joint shoulder 384 contacts the sealing nipple 35, the sealing mechanism 38 stops moving upwards, when the sealing mechanism 38 reaches a downlink limit position, the adjusting joint 34 contacts the accumulator connecting pipe 36, and the sealing mechanism 38 stops moving downwards;

a one-way ball valve 42 is connected below the sealing mechanism 38, the one-way ball valve 42 is arranged in the one-way ball valve cavity 40, the one-way ball valve cavity 40 is arranged in the sealing joint 385, and the one-way ball valve 42 is arranged so that air flow can only flow into a pressure channel 382 of the sealing mechanism 38 from bottom to top through the one-way ball valve 42;

The lower end of the one-way ball valve 42 is arranged on the ball valve seat 41, an axial channel is arranged on the ball valve seat 41, the ball valve seat 41 is fixedly connected with the sealing joint 385, and the ball valve seat 41 is positioned in the temperature and pressure instrument connecting pipe 43;

the lower end of the temperature and pressure instrument connecting pipe 43 is connected with the upper end of the core connecting nipple 46, the lower end of the core connecting nipple 46 is fixedly connected with the upper end of the core 47, preferably in threaded connection, the lower end of the core 47 is connected with a petal blocking spring 55 for acquiring and fixing a core sample, and the core 47 is positioned in the middle pipe 48;

the pressure maintaining ball valve overturning sealing mechanism 49 comprises a spring limiting ring 4901, a ball valve driving nipple 4902, a spring 4903, a ball valve driving nipple spring shoulder 4904, a ball valve pipe shoulder 4905, an upper ball valve seat sealing ring 4906, an upper ball valve seat 4907, a ball valve pipe 4908, a ball valve 4909, a ball valve overturning driving bolt 4912, a ball valve shaft 4910, a ball valve overturning sliding groove 4911, a ball valve pipe oblong hole 4913, a ball valve pipe window 4914, a lower ball valve seat 4915, a lower ball valve seat sealing ring 4916, a bearing spring 4917 and a ball valve lower gland 4918; the ball valve 4909 is provided with a ball valve shaft 4910 and a ball valve overturning sliding groove 4911, and the ball valve 4909 is provided with a through hole for the core tube 47 to pass through;

a ball valve tube 4908 sealing ring (not shown in the figure), a ball valve overturning driving bolt 4912 and a ball valve tube oblong hole 4913 are sequentially arranged on the ball valve tube 4908 on the inner tube assembly a 201 from top to bottom;

The upper end of the ball valve tube 4908 is connected with the lower end of the middle tube 48, preferably the upper end of the ball valve tube 4908 is connected with the lower end of the middle tube 48 through threaded connection, a ball valve tube 4908 sealing ring is arranged at the joint of the ball valve tube 4908 and the middle tube 48, a ball valve tube window 4914 is arranged in the hollow of the ball valve tube 4908, a ball valve tube oblong hole 4913 is arranged in the middle of the ball valve tube 4908, a ball valve overturning driving bolt 4912 positioned in the ball valve tube oblong hole 4913 is fixed on the inner wall of the ball valve tube 4908, and the ball valve overturning driving bolt 4912 extends into a ball valve overturning sliding groove 4911 on the ball valve 4909;

the ball valve 4909 is fixedly arranged in a ball valve tube window 4914 on the ball valve tube 4908 through a ball valve shaft 4910, one end of the ball valve shaft 4910 is connected with the ball valve 4909, and the other end of the ball valve shaft extends into a ball valve tube oblong hole 4913 and can freely slide in the ball valve tube oblong hole 4913 along the axial direction;

an upper ball valve seat 4907 and a lower ball valve seat 4915 are arranged in the ball valve tube 4908, an upper ball valve seat sealing ring 4906 is arranged at the joint of the ball valve tube 4908 and the upper ball valve seat 4907, a lower ball valve seat sealing ring 4916 is arranged at the joint of the ball valve tube 4908 and the lower ball valve seat 4915, sealing contact is formed between the upper ball valve seat 4907 and the ball valve tube 4908 by arranging the upper ball valve seat sealing ring 4906 at the gap between the upper ball valve seat 4907 and the inner wall of the ball valve tube 4908, sealing contact is formed between the lower ball valve seat 4915 and the ball valve tube 4908 by arranging the lower ball valve seat sealing ring 4916 at the gap between the lower ball valve seat 4915 and the ball valve tube 4908, a ball valve tube shoulder 4905 is arranged at the upper end of the ball valve tube 4908, the middle part of the ball valve tube 4908 contacts with the middle tube 48 through concave-convex matching and props against the middle tube 48, and the lower part of the ball valve tube 4908 is connected with the middle tube 48, preferably in threaded connection, so that the connection between the middle tube 48 and the ball valve tube 4908 is ensured to be more firm;

The upper end of the upper ball valve seat 4907 is connected with the lower end of the ball valve driving nipple 4902, the lower end is contacted with the upper end of the ball valve 4909, the ball valve driving nipple 4902 is positioned below the core tube connecting nipple 46, the ball valve driving nipple 4902 is positioned between the core tube 47 and the middle tube 48, a spring 4903 is further arranged between the ball valve driving nipple 4902 and the middle tube 48, the spring 4903 is sleeved on the ball valve driving nipple 4902, the upper end of the spring 4903 is contacted with the spring limiting ring 4901 and is pressed by the spring limiting ring 4901, namely, the opened upper limiting position of the spring 4903 is limited by the spring limiting ring 4901, the spring limiting ring 4901 is limited by the middle tube shoulder 481 through concave-convex fit, the spring limiting ring 4901 is compressed by the spring limiting ring 4901, the spring limiting ring 4901 is positioned between the core tube 47 and the middle tube 48, the lower end of the spring limiting ring 4901 is contacted with the ball valve driving nipple spring 4904 and is propped against the spring limiting ring 4904 of the ball valve driving nipple 4904, the upper end of the spring 4903 is contacted with the spring limiting ring 4901 and is a convex limiting ring 4901 of the ball valve driving nipple 4902 or the ball valve driving nipple 4902 is fixedly connected with the ball valve driving nipple 4902;

By disposing the spring 4903 between the spring retainer ring 4901 and the ball valve drive nipple spring shoulder 4904 such that the spring 4903 is in a compressed state, the ball valve tube shoulder 4905 is located between the ball valve drive nipple 4902 and the middle tube 48 and above the upper ball valve seat 4907;

the lower ball valve seat 4915 is provided with a bearing spring 4917 and a ball valve lower gland 4918 from top to bottom, the upper and lower ends of the bearing spring 4917 are respectively connected with the lower ball valve seat 4915 and the ball valve lower gland 4918, and the upper end of the lower ball valve seat 4915 is contacted with the lower end of the ball valve 4909;

a load-bearing spring 4917 for realizing the floating contact between the ball valve 4909 and the lower ball valve seat 4915;

the upper end of the ball valve tube 4908 is connected with the lower end of the middle tube 48, so that the connection between the pressure-maintaining ball valve overturning sealing mechanism 49 and the middle tube 48 is realized, and the spring 4903 in a compressed state pushes the ball valve 4909 of the pressure-maintaining ball valve overturning sealing mechanism 49 to slide downwards and overturn by 90 degrees through the ball valve driving nipple 4902.

In specific use, as shown in the figure, before coring and fishing, that is, when the invention is used for coring installation, the core barrel 47 passes through the through hole of the ball valve 4909, the core barrel 47 is closely attached to the ball valve 4909, after the core barrel 47 is installed, the bullet clamping mechanism 22 is limited in the bullet clamping chamber 110 and cannot pass through the bullet clamping chamber 110 upwards, and the bullet clamping suspension mechanism 27 is limited in the middle pipe nipple 30 and cannot pass through the middle pipe nipple 30, so that the inner pipe assembly b 202 cannot axially move at the moment, and the core barrel 47 cannot axially move, that is, remains axially fixed; the ball valve 4909 is subjected to the thrust force transmitted by the spring 4903 under the compressed state through the ball valve driving nipple 4902, and because the ball valve 4909 is tightly attached to the core barrel 47 at this time, the transverse resistance of the core barrel 47 to the ball valve 4909 is equivalent to that of the core barrel 47, so that the ball valve 4909 cannot be turned downwards due to the thrust force given by the spring 4903, namely, the core barrel 47 limits the ball valve 4909 to be turned downwards, meanwhile, the ball valve 4909 is contacted by the core barrel 47, so that the ball valve 4909 upwards abuts against the upper ball valve seat 4907, the upper ball valve seat 4907 upwards abuts against the ball valve driving nipple 4902 to upwards move the ball valve driving nipple spring shoulder 4904 on the ball valve driving nipple 4902 correspondingly upwards, and the spring limiting ring 4901 is limited by the middle pipe shoulder 481 on the middle pipe 48, so that the spring 4903 is compressed and the elastic potential energy is increased; after the coring is completed and salvaged, as shown in the figures and drawings, after the core barrel 47 is lifted upwards from the through hole of the ball valve 4909, the transverse resistance of the core barrel 47 to the ball valve 4909 disappears, namely the core barrel 47 does not limit the ball valve 4909 to overturn downwards, the ball valve 4909 moves downwards along the long round hole 4913 of the ball valve pipe integrally under the thrust given by the spring 4903 because the elastic potential energy of the spring 4903 is enough, when the ball valve shaft 4910 connected with the ball valve 4909 contacts the ball valve overturning driving bolt 4912, the ball valve overturning driving bolt 4912 is pushed by the thrust generated by the spring 4903, and the ball valve overturning driving bolt 4912 is propped against a torque on the ball valve 4909 because the ball valve overturning driving bolt 4912 gives a torque to the ball valve 4909, so that the ball valve 4909 slides downwards and overturns 90 degrees, and during the ball valve 4909 slides downwards, the ball valve 4909 pushes the lower ball valve seat 4915 downwards, and the lower ball valve seat 4917 compresses and moves downwards until the lower ball valve seat 4915 contacts the ball valve overturning seat 4918, namely reaches the lower ball valve seat 4918;

Through the above operation, the pressure-maintaining ball valve overturning sealing mechanism 49 and the core barrel 47 are mutually matched to realize that the ball valve 4909 slides downwards and overturns by 90 degrees;

ball valve 4909 and last ball valve seat 4907 sealing contact realize the pressurize effect in ball valve 4909 upper region, and core barrel 47 is located the pressurize region of ball valve 4909 top this moment for core sample in the core barrel 47 is in the pressurize state, realizes the pressurize sample of core barrel.

Further, an energy storage chamber is arranged between the lower part of the adjusting joint 34 and the upper part of the sealing mechanism 38, the energy storage chamber is positioned in the energy storage connecting pipe 36, an energy storage device 37 is arranged in the energy storage chamber, the energy storage device 37 is connected with the quick-insertion check valve pressure measuring joint 381, and the energy storage device 37 is used for maintaining stable pressure.

Further, a temperature and pressure testing chamber 44 is arranged between the lower part of the ball valve seat 41 and the upper part of the core barrel connecting nipple 46, the temperature and pressure testing chamber 44 is positioned in the temperature and pressure instrument connecting pipe 43, and equipment for measuring temperature and pressure parameters is arranged in the temperature and pressure testing chamber 44.

Further, a flushing mechanism (not shown in the figure) for flushing the core tube 47 is connected to the lower end of the pressure maintaining ball valve overturning sealing mechanism 49, and is installed on the inner tube assembly a 201, so that pollutants such as cuttings on the core tube 47 are prevented from being brought into the coring device, particularly into a pressure maintaining area, the pressure maintaining effect is further affected, and even the pressure maintaining is possibly not realized;

The flushing mechanism comprises a flushing water inlet 51 and a flushing water outlet 52, and is used for carrying out high-pressure rapid flushing on the rock debris on the core tube 47 after the high-pressure drilling fluid enters from the flushing water inlet 51, and then the drilling fluid is discharged from the flushing water outlet 52, is in threaded connection with the lower end of the ball valve tube 4908 and is connected with the lower end of the ball valve lower gland 4918.

In this embodiment, the flushing mechanism is provided with two water outlet channels, namely, a first water outlet channel formed by the gap between the outer tube drill bit 140 and the middle tube drill bit 56 and a second water outlet channel formed by the gap between the core barrel 47 and the middle tube drill bit 56, drilling fluid enters the inner tube assembly b 202 from the water inlet 225, flows out of the distributing tube water outlet 251 and enters between the inner tube assembly a 201 and the inner tube assembly b 202, then flows out of the piston tube water outlet 501 and enters the area between the outer tube assembly 10 and the inner tube assembly 20, and because the centralizing ring 130 is in sealing contact with the flushing mechanism, the drilling fluid between the outer tube assembly 10 and the inner tube assembly 20 enters the flushing mechanism through the flushing water inlet 51, one path of the drilling fluid entering the flushing mechanism from the flushing water inlet 51 is discharged from the first water outlet channel, namely, from the gap between the outer tube drill bit 140 and the middle tube drill bit 56, and the other path of the drilling fluid is discharged from the second water outlet channel, namely, from the gap between the core barrel 47 and the middle tube drill bit 56, so that the flushing fluid is jointly realized.

In this embodiment, the middle pipe drill 56 is connected with the flushing mechanism and is located below the flushing mechanism, the middle pipe drill 56 is a five-wing cemented carbide drag bit or a PDC bit or a bit made of other materials, and the middle pipe drill 56 is connected with the flushing mechanism, the flushing mechanism is connected with the ball valve pipe 4908 and the ball valve pipe 4908 is connected with the middle pipe 48, so that the middle pipe drill 56 is connected with the middle pipe 48, and further, the middle pipe drill 56 is connected with the inner pipe assembly 20, that is, the inner pipe assembly 20 can drive the middle pipe drill 56 to rotate.

In this embodiment, the outer tube drill bit 140 is provided with an inwardly protruding torque transmission shoulder 141, and the torque transmission shoulder 141 is mutually meshed with an outwardly protruding torque transmission spline 53 arranged on the middle tube drill bit 56, so that the outer tube drill bit 140 transmits torque to the middle tube drill bit 56 and drives the middle tube drill bit 56 to mutually cooperate and rotate together, so that the outer tube drill bit 140 cooperates with the middle tube drill bit 56 to perform core sample coring; a certain gap is arranged between the petal blocking spring 55 and the middle pipe drill bit 56, and the inner diameter of the petal blocking spring 55 is larger than that of the middle pipe drill bit 56, so that in the rotary coring process, the middle pipe drill bit 56 rotates to a length, the petal blocking spring 55 does not rotate and keeps single action, and a core sample subjected to rotary trimming of the middle pipe drill bit 56 is facilitated to enter the petal blocking spring 55 and the core barrel 47.

In particular use, when the inner tube assembly 20 is successfully installed inside the outer tube assembly 10, then: the card ejection a 221 on the card ejection mechanism 22 is in an open state and is limited in the card ejection chamber 110, so that the card ejection mechanism 22 is limited by the card ejection chamber 110 and cannot move upwards axially;

the spring clip hanging mechanism 27 is in an open state through the spring clip b 276 on the spring clip hanging mechanism 27 and is limited by the middle pipe nipple 30, namely, the open spring clip b 276 contacts with the shoulder of the middle pipe nipple 30 to be limited, so that the spring clip hanging mechanism 27 is limited to prevent the spring clip hanging mechanism 27 from moving upwards axially; the whole inner tube assembly 20 cannot move downwards axially due to being limited by the suspension ring 24, the inner tube assembly 20 reaches the lower limit position, and the inner tube assembly 20 cannot move upwards due to the limitation of the inner tube assembly 20 by the spring clip mechanism 22 and the spring clip suspension mechanism 27.

Before the fishing core is taken, the upper part and the lower part of the connecting mechanism 26 are in contact connection, and when the inner pipe assembly 20 is successfully installed inside the outer pipe assembly 10, the fishing core taking process is started: firstly, slurry is injected into the inner pipe assembly 20 through a slurry pump, the slurry enters the inner pipe assembly 20 from the water inlet 225, then, the slurry flows out from the water outlet 251 of the distributing pipe and then impacts the piston 262 below, hydraulic pressure generated by the slurry pushes the piston 262 downwards, the piston 262 compresses the supporting spring 267 downwards through the spring compression ring 266, so that the shaft of the inserted connecting rod 268 moves upwards relatively relative to the piston inner chamber guide hole 2622, the sliding bolt 265 slides upwards axially along the piston inner chamber guide hole 2622, the piston inner chamber guide hole 2622 pushes the sliding bolt 265 to retract towards the inside of the second bolt sliding hole 2682, and the body of the sliding bolt 265 slides into the first bolt sliding hole 2631, so that the bolt spring 264 is compressed; when the sliding bolt 265 moves up to the upper part of the shoulder 2621 of the inner chamber of the piston, the elastic bolt pulling hole 2623 moves down continuously, the elastic bolt pulling hole 2623 is positioned below the water outlet 501 of the piston tube, so that the piston tube 501 and the chamber between the piston tube 50 and the distributing tube 25 are communicated, the water outlet 501 of the piston tube is communicated with the water outlet 251 of the distributing tube, a mud circulation channel is formed, mud in the inner tube assembly 20 flows out from the water outlet 501 of the piston tube to the area between the outer tube assembly 10 and the inner tube assembly 20 through the water outlet 251 of the distributing tube, the hydraulic pressure generated by mud in the inner tube assembly 20 is reduced, the piston 262 stops moving down axially, and at the moment, when the elastic bolt pulling hole 2623 reaches the upper limit position, the extension part of the sliding bolt 265 is in the elastic bolt pulling hole 2623, so that the upper part and the lower part of the connecting mechanism 26 are changed into a fixed connection state from a contact state;

When the upper part and the lower part of the connecting mechanism 26 become fixedly connected, the salvaging spearhead 21 drives the disengaging pipe 223 and the first elastic pin 233 on the disengaging pipe 223 to move upwards axially along the lifting pipe long pin hole 231 and the elastic clamping bracket pipe long pin hole 224, the first elastic pin 233 moves upwards to be in contact with the top of the lifting pipe long pin hole 231, then the first elastic pin 233 continues to move upwards axially along the elastic clamping bracket pipe long pin hole 224 under the driving of the disengaging pipe 223 and moves upwards axially along the lifting pipe 232, and the salvaging spearhead 21 moves upwards axially along the lifting device 23 through the elastic clamping mechanism 22;

before the first elastic pin 233 contacts the upper end of the elastic clamping bracket pipe long pin hole 224, the first elastic pin 233 drives the releasing pipe b 272 to move upwards through the lifting pipe 232 of the lifting device 23 and the inserting connecting rod 268 of the connecting mechanism 26, the releasing pipe b 272 drives the releasing pipe inclined part b 277 to move upwards axially, the releasing pipe inclined part b 277 drives the second elastic pin 293 connected with the releasing pipe inclined part b 277 to move upwards along the elastic pin long round hole 292 until the second elastic pin 293 contacts the top end of the elastic pin long round hole 292, the releasing pipe inclined part b 277 also contacts the elastic clamping b 276 while the second elastic pin 293 contacts the top end of the elastic pin long round hole 292, the releasing pipe b 272 continues to drive the releasing pipe inclined part b 276 to move upwards and downwards so that the contact with the middle pipe nipple 30 is broken, and the releasing pipe b 277 completes the releasing action, namely the releasing pipe b 277 drives the releasing pipe inclined part b 277 to move upwards by driving the releasing pipe b 277 to move upwards until the releasing pipe b 277 contacts the releasing pipe inclined part b 276 to be far away from the elastic nipple 276, and the releasing pipe 276 is in a state of being far away from the releasing pipe 276;

In the process that the disengaging tube b 272 drives the disengaging tube inclined portion b 277 to move upwards axially to contact the card spring b 276, namely, the disengaging tube inclined portion b 277 moves towards the direction approaching the card spring b 276;

then, the whole spring clip hanging mechanism 27 can move upwards and axially, and the spring clip hanging mechanism 27 sequentially drives the single-acting mechanism 31, the sealing mechanism 38, the core tube 47 and the petal blocking spring 55 to move upwards and axially through the second elastic pin 293;

the salvaging spearhead 21 continues to drive the bullet clip hanging mechanism 27, the single action mechanism 31, the sealing mechanism 38, the core barrel 47 and the petal blocking springs 55 to move upwards axially through the clip removing pipe 223, and the core barrel 47 and the petal blocking springs 55 continue to move upwards axially until the sealing joint shoulder 384 of the sealing mechanism 38 contacts the sealing nipple shoulder 351 of the sealing nipple 35 to stop moving upwards, i.e. when the core barrel 47 reaches the upward limit position, the sealing joint shoulder 384 contacts the sealing nipple shoulder 351 as shown in the figure;

before the inclined part 227 of the unclamping tube contacts the elastic clamp a 221, the core barrel 47 and the petal blocking spring 55 are lifted upwards in advance from the through hole of the ball valve 4909, so that the transverse resistance of the core barrel 47 to the ball valve 4909 disappears, namely the core barrel 47 does not block the ball valve 4909 from turning downwards, at the moment, the ball valve 4909 moves downwards along the long round hole 4913 of the ball valve tube integrally under the thrust given by the spring 4903, and in the process of moving downwards of the ball valve 4909, the ball valve turning sliding groove 4911 is caused to slide and rotate around the ball valve 4909 turning driving pin fixed on the ball valve tube 4908, and meanwhile, the ball valve 4909 is given turning torque and is driven to turn 90 degrees;

After the ball valve 4909 slides downwards and turns over by 90 degrees, the salvaging spearhead 21 drives the disengaging pipe inclined portion b 277 to move towards the direction approaching the card b 276, so that the disengaging pipe inclined portion 227 contacts the card a 221, the card a 221 breaks contact with the card ejection chamber 110, and the disengaging action is completed; after the disengaging action is completed, the salvaging spearhead 21 drives the disengaging pipe 223 to move upwards and axially, so that the whole inner pipe assembly 20 can be pulled out from the outer pipe assembly 10, namely after the disengaging of the inner pipe assembly b 202 is completed, the inner pipe assembly b 202 can move upwards and axially under the driving of the salvaging spearhead 21, further, a core sample of the inner pipe assembly 20 is taken out, and the whole coring process is completed.

The area from the above part where the ball valve 4909 contacts the upper ball valve seat 4907 to the below part where the sealing joint shoulder 384 contacts the sealing nipple 35 is a stable pressure maintaining area, and the core barrel 47 filled with the core sample is located in the pressure maintaining area, so that the core is ensured to be in the pressure maintaining area, the core is in a pressure maintaining state under high pressure, and pressure maintaining and coring are realized.

The connecting mechanism 26 is separated from the upper part and the lower part of the connecting mechanism 26 in the process of hoisting and putting the inner pipe assembly 20 at the hole bottom before putting the inner pipe assembly at the hole bottom, and only in the process of coring, after the drilling mud circularly pushes the piston to move downwards, the extension part of the sliding bolt 265 can extend into the elastic bolt pulling hole 2623, so that the upper part and the lower part of the connecting mechanism 26 are fixedly connected. Therefore, in the process of hoisting before putting the ball valve 4909 into the hole bottom and putting the ball valve 4909 into the hole bottom, due to the disconnection of the connecting mechanism 26, the salvaging spearhead 21 does not lift the seizing-off pipe b of the inner pipe assembly b 202, so that the inner pipe assembly b 202 does not seize from the inner pipe assembly a 201, the core barrel 47 does not move upwards, the core barrel 47 does not lift upwards from the through hole 4909 of the ball valve 4909, the ball valve 4909 is prevented from overturning downwards in advance before coring, and accidents that the ball valve 4909 is closed in advance before coring is avoided.

Various other corresponding changes and modifications will occur to those skilled in the art from the foregoing description and the accompanying drawings, and all such changes and modifications are intended to be included within the scope of the present invention as defined in the appended claims.

Claims

1. A safe type natural gas hydrate rotary pressure maintaining coring device is characterized in that: the drill bit is arranged at the bottom end of the outer tube assembly;

the core barrel is positioned in the middle pipe;

The inserted connecting rod sequentially passes through an axial channel formed by the spring compression ring and the guide hole of the inner cavity of the piston and then extends into the inner cavity of the joint, the lower end of the inserted connecting rod is provided with a connecting rod spring shoulder, the lower part of the inserted connecting rod is sleeved with a supporting spring, and the supporting spring is positioned between the spring compression ring and the connecting rod spring shoulder;

when the sliding bolt reaches the uplink limit position, the extension part of the sliding bolt stretches into the elastic bolt pulling hole; when the piston reaches the descending limit position, the water outlet of the piston pipe is positioned above the piston and communicated with the water outlet of the distributing pipe,

When the core barrel passes through the through hole of the ball valve downwards, the edge of the ball valve is tightly attached to the core barrel, the core barrel limits the ball valve to turn downwards, meanwhile, the ball valve is contacted by the core barrel to enable the ball valve to upwards prop against the upper ball valve seat, and the spring limiting ring is limited by the middle pipe shoulder on the lower middle pipe; when the core barrel is lifted out from the through hole of the ball valve, the ball valve is separated from the core barrel and turned over by 90 degrees, and the ball valve reaches the lower limit position, the bearing spring is compressed to the lower ball valve seat to be contacted with the lower gland of the ball valve,

the lower end connection of pressurize ball valve upset sealing mechanism is equipped with the washing mechanism that washes the core barrel, and washing mechanism is equipped with the water outlet channel, and the water outlet channel is outer tube drill bit and well pipe drill bit clearance and core barrel and well pipe drill bit clearance.

2. The safety type natural gas hydrate rotary pressure maintaining coring device according to claim 1, wherein: the sealing mechanism comprises a quick-insertion one-way valve pressure measuring joint, a pressure channel, sealing joint sealing rings, sealing joints and sealing joint shoulders, wherein the upper end of each sealing joint is connected with the lower end of each energy accumulator connecting pipe, the axial pressure channel is arranged in the middle of each sealing joint, the quick-insertion one-way valve pressure measuring joint extends into each pressure channel, the sealing joint sealing rings are sleeved on the sealing joints, the sealing joint shoulders are arranged on two sides of each sealing joint, and the lower end of each sealing joint is connected with the upper end of each temperature and pressure meter connecting pipe.

3. The safety type natural gas hydrate rotary pressure maintaining coring device according to claim 1, wherein: an upper ball valve seat sealing ring is arranged at the joint of the ball valve pipe and the upper ball valve seat, and a lower ball valve seat sealing ring is arranged at the joint of the ball valve pipe and the lower ball valve seat; the lower ball valve seat is provided with a bearing spring and a ball valve lower gland from top to bottom, the upper end and the lower end of the bearing spring are respectively connected with the lower ball valve seat and the ball valve lower gland, and the upper end of the lower ball valve seat is contacted with the lower end of the ball valve.

4. A safety type natural gas hydrate rotary pressure maintaining coring device according to claim 1 or 3, wherein: the ball valve is in floating contact with the lower ball valve seat.

5. The safety type natural gas hydrate rotary pressure maintaining coring device according to claim 1, wherein: the bullet card mechanism includes bullet card a, bullet card bracket a, take off the card pipe, the water inlet, bullet card bracket pipe long pinhole, bullet card bracket pipe a, take off card pipe tilting part, bullet card a sets up in the bullet card is indoor, and be connected with bullet card bracket a, bullet card room sets up the inner wall at the outer tube assembly, bullet card bracket a connects and sets up inside taking off the card pipe, take off card pipe and salvage spearhead fixed connection, take off the bottom of card pipe and be equipped with be used for taking off the bullet card from bullet card room take off the card pipe tilting part that comes out, take off and be equipped with the water inlet on the lateral wall of card pipe, bullet card bracket pipe long pinhole sets up at bullet card bracket pipe a's well intracavity portion.

6. The safety type natural gas hydrate rotary pressure maintaining coring device according to claim 1, wherein: the lifting device comprises a lifting pipe, a lifting pipe long pin hole and a first elastic pin, wherein the lifting pipe long pin hole is formed in the lifting pipe; the first elastic pin penetrates through the long pin hole of the elastic clamping bracket tube and the long pin hole of the lifting tube and then is fixedly arranged on the clamping removing tube, the central axes of the long pin hole of the elastic clamping bracket tube and the long pin hole of the lifting tube are on the same straight line, and the lifting tube, the elastic clamping bracket tube a and the clamping removing tube are connected in a sleeved mode.

7. The safety type natural gas hydrate rotary pressure maintaining coring device according to claim 1, wherein: the spring card hanging mechanism comprises a spring card bracket b, a card removing pipe b, a spring card cavity, a spring card opening, a spring card cavity, a spring card b, a spring card bracket nipple and a card removing pipe inclined part b; the upper portion of bullet card suspension mechanism sets up in the inside of piston tube, and the salvage spearhead is used for driving the inclined part b of taking off the card pipe and moves towards the direction that is close to bullet card b for bullet card b breaks off with the contact of well pipe nipple joint.

8. The safety type natural gas hydrate rotary pressure maintaining coring device according to claim 1, wherein: the single-acting mechanism comprises an upper thrust bearing, a mandrel, a copper sleeve, a bearing jacket, a lower thrust bearing and a locking nut, wherein the upper end of the mandrel is in threaded connection with the bottom end of the elastic pin nipple, the bearing jacket is sleeved on the mandrel, the copper sleeve is arranged between the bearing jacket and the mandrel, the upper end and the lower end of the copper sleeve are respectively provided with the upper thrust bearing and the lower thrust bearing, the locking nut is arranged at the bottom end of the mandrel, and the lower thrust bearing is positioned above the locking nut.