WO2020034362A1

WO2020034362A1 - Automatically closing mechanism of core drilling rig

Info

Publication number: WO2020034362A1
Application number: PCT/CN2018/109032
Authority: WO
Inventors: 陈领; 谢和平; 高明忠; 张志龙; 张茹; 张泽天; 鲁义强; 李聪; 何志强; 华夏; 明传剑; 彭高友; 陆彤
Original assignee: 四川大学; 深圳大学
Priority date: 2018-08-13
Filing date: 2018-09-30
Publication date: 2020-02-20

Abstract

An automatically closing mechanism of a core drilling rig, the mechanism comprising a flow channel blockage module, a decompression module and a central rod (6), wherein the flow channel blockage module is arranged in front of the decompression module, and the flow channel blockage module comprises a valve shell (1), a lock housing (2), a locking sleeve (3), a fixed ring (4), an outer cylinder (5) and a safety gear (51); the decompression module comprises a lock pin (82), a locking rod (81), a connecting pipe (72), a lock body (71) and a cutting plunger (9); decompression holes (7221) are provided at a pipe wall of the connecting pipe, and the lock body (71) is connected to the cutting plunger (9) by means of a shear pin; the flow channel blockage module is arranged behind a hydraulic motor, so as to block a fluid flow channel; and the decompression module pushes the cutting plunger by means of hydraulic back flushing, so that a decompression passage is opened. According to the automatically closing mechanism of a core drilling rig, a hydraulic passage can be automatically blocked when the drilling rig drills downwards to a certain depth, energy supply to the hydraulic motor is stopped, and the hydraulic pressure in the drilling rig is released.

Description

Automatic end mechanism of core drilling rig

Technical field

The invention relates to a drilling and coring system, in particular to an automatic ending mechanism of a coring rig.

Background technique

In the process of oilfield exploration, cores are important data for discovering oil and gas layers and studying formations, oil layers, reservoirs, caps, structures, etc. By observing and studying cores, you can directly understand the lithology and physical properties of underground rocks. And oily, gas, aquatic characteristics. After the oilfield is put into development, it is necessary to further study and understand the sedimentary characteristics of the reservoir through the core, the physical properties, pore structure, wettability, relative permeability, lithofacies of the reservoir, physical simulation of the reservoir, and the law of water flooding in the reservoir; Water flooding characteristics of the reservoirs in the development stage and in different water-cutting stages, to clarify the distribution of remaining oil, and to provide scientific basis for the design of oilfield development schemes, layer system, well pattern adjustment, and infill wells.

Coring is the use of special coring tools to pull underground rocks into the ground during drilling. This type of rock is called a core, which can be used to determine various properties of the rock and intuitively study the underground structure. And rock sedimentary environment, and understand the fluid properties. In the process of mineral exploration and development, it is necessary to carry out drilling according to the stratigraphic level and depth of the geological design, run core tools into the well, and drill out the rock samples.

After the rig drills to a certain depth, the internal hydraulic pressure of the rig needs to be drained and drilling stopped to prevent the motor from continuously rotating to damage the drill bit and the core.

Summary of the Invention

The invention aims to provide an automatic ending mechanism of a core drilling rig, which can automatically block the hydraulic passage after drilling to a certain depth, stop supplying power to the hydraulic motor, and drain the internal hydraulic pressure of the rig.

In order to achieve the above objective, the technical solution adopted by the present invention is as follows:

The automatic end mechanism of the core drilling rig disclosed in the present invention includes a flow blocking module, a pressure relief module and a center rod, and the flow blocking module is in front of the pressure relief module;

Flow blocking module: including valve housing, lock housing, lock sleeve, fixing ring and outer tube, center rod, valve housing, lock housing, lock sleeve, fixing ring and outer tube coaxial, the center rod passes through the valve housing Internal cavity, the valve housing is in the lock housing, and the lock housing passes through the inner cavity of the locking sleeve. The valve housing includes a sealing section, a diversion section and a locking section A from back to front. The outer wall of the locking section A is provided with Locking groove A. The lock housing includes an inflow section, an outflow section and a lock section B from back to front. The inner diameter of the inflow section is larger than the outer diameter of the sealing section, the outer diameter of the sealing section is larger than the outer diameter of the diversion section, and the inner diameter of the outflow section. It is equal to the outer diameter of the seal section. The outflow section has an outflow hole. The lock section B has a lock hole. Both the outflow hole and the lock hole are through holes. There is a lock ball in the lock hole. The diameter of the lock ball is larger than the lock. The depth of the hole. The locking sleeve includes an impact section and a locking section C from back to front. The inner wall of the locking section C has a locking groove B. The distance from the bottom of the locking groove A to the inner wall of the locking section B is smaller than the locking ball. Diameter, the distance from the bottom of the locking groove A to the outer wall of the locking section B is not less than the diameter of the locking ball, and the distance from the bottom of the locking groove B to the outer wall of the locking section B Smaller than the diameter of the locking ball, the distance from the bottom of the locking groove B to the inner wall of the locking section B is not less than the diameter of the locking ball, the fixing ring is fixed on the outer wall of the locking section B, the fixing ring is behind the locking hole, and impacts The inner diameter of the segment is larger than the outer diameter of the fixed ring. The locking segment C is in front of the fixed ring. The inner diameter of the outer cylinder is larger than the outer diameter of the lock housing and the locking sleeve. The inner wall of the outer cylinder is connected with a safety gear. The safety gear includes clamping from back to front. The inner diameter of the front end face of the pressing part is smaller than the outer diameter of the impact section. The inner diameter of the front face of the pressing part is not less than the outer diameter of the fixed ring. The inner diameter of the front face of the clamping part is smaller than the outer diameter of the rear end face of the fixed ring. The limiting head is in the locking section B, the limiting head is in front of the locking section A, the gap between the outer wall of the limiting head and the inner wall of the lock housing is smaller than the thickness of the front end of the locking section, and the front end surface of the clamping part to the front end surface of the pressing part The axial distance is equal to the axial distance from the center of the locking hole to the center of the locking groove B before the stop of drilling. The distance from the rear end of the sealing section before the stop of drilling to the rear end of the outflow hole is greater than the distance of the center of the locking hole to the locking groove after the stop of drilling. The axial distance of the center of A is greater than the distance from the front end of the sealing section to the front end of the outflow hole before the drilling stop;

Pressure relief module: including lock pin, lock lever, connecting pipe, lock body and shear plunger, center lever, lock pin, lock lever, connecting pipe, lock body and shear plunger coaxial, lock pin from back to front The connecting part includes a connecting part and a working part. The connecting part is connected to the locking rod. The central rod passes through the locking pin and the inner cavity of the locking rod. The outer diameter of the central rod is smaller than the inner diameter of the locking pin and the locking rod. The side wall of the locking rod is provided with an inflow hole. The front part includes the connection section, the pressure relief section and the choke section. The outer diameter of the working part is equal to the inner diameter of the choke section. The inner diameter of the choke section is smaller than the inner diameter of the pressure relief section. The pressure relief section has a pressure relief hole. The pressure relief hole is a through hole. The connecting section is connected to the lock body. The inner wall of the lock body is provided with shear pin holes, and the shear pin holes have shear pins. The length of the shear pin is greater than the depth of the shear pin hole. The inner diameter of the shear plunger is greater than the outer diameter of the lock pin and the lock rod. The cutting plunger includes a shearing section and a recoil section from back to front. The outer diameter of the shearing section is equal to the inner diameter of the lock. The outer diameter of the recoiling section is equal to the inner diameter of the front part of the pressure relief hole of the pressure relief section. The outer wall of the shear section is provided with shear pins. Groove, before drilling stop, the front end of the recoil section is in front of the front of the pressure relief hole, and the inner end of the shear pin is embedded in the shear pin slot. In the front end of the rear distal relief hole;

The channel A is between the outer wall of the center rod and the inner wall of the lock rod and the lock pin. The channel B is between the inner wall of the shear plunger, the inner wall of the connecting tube and the outer wall of the lock rod and the lock pin. The inner wall of the inflow section and the outer wall of the center rod are: Liquid channel C, liquid channel A communicates with liquid channel C, liquid channel A communicates with liquid channel B through the inflow hole, and liquid channel B communicates with the liquid supply equipment. Before drilling is stopped, the front end of the sealing section is in the inflow section, and liquid channel C is connected with the outflow. The holes communicate with each other. After the drilling is stopped, the sealing section and the outflow section are tightly matched, and the liquid channel C is cut off from the outflow hole.

Further, the front end of the locking section C is supported by a spring.

Further, the outer diameter of the outflow section is larger than the outer diameter of the locking section B, and the inner diameter of the fixing ring is equal to the outer diameter of the locking section B.

Further, it also includes a snap ring, the outer diameter of the snap ring is larger than the inner diameter of the fixed ring, the inner diameter of the snap ring is smaller than the inner diameter of the fixed ring, the snap ring is embedded in the groove on the outer wall of the locking section B, and the fixed ring is connected to the rear end of the snap ring and the outflow section Between the front ends.

Further, a sealing groove A is formed on an outer wall of the recoil section, and a sealing ring is arranged in the sealing groove A.

Further, a seal groove B is formed on the inner wall of the lock body, a seal ring is arranged in the seal groove B, and the seal groove B is in front of the shear pin hole.

Further, the lock body is threadedly connected to the connecting pipe, the front end of the lock body is externally threaded, the rear end of the connecting pipe is internally threaded, the shear pin hole is a through hole, and the shear pin hole is at the thread of the lock body.

Further, the lock pin is threadedly connected to the lock lever.

Further, the shear pin groove, the locking groove A and the locking groove B are all annular grooves.

Further, a diversion groove is formed on the outer wall of the connecting pipe, the diversion groove is directly in front of the pressure relief hole, the diversion groove is arranged axially, and the diversion groove is in communication with the pressure relief hole.

The invention has the following beneficial effects:

1. Before stopping drilling, the locking ball is in the locking hole and locking groove A, which locks the valve housing, and maintains the fluid passage C communicating with the hydraulic motor in front through the outflow hole. When the outer cylinder moves forward to the stopping position, the outer The cylinder drives the safety gear to hit the locking sleeve, so that the locking sleeve moves forward, the locking groove B is directly opposite the locking hole, the radial constraint of the locking ball is released, and the liquid impacts the rear end of the valve housing, and the locking ball is squeezed into In the locking groove B, the valve housing moves forward, the sealing section cuts off the liquid channel C from the outflow hole, stops supplying power to the forward motor, and the motor stops. Because the liquid channel C is blocked, the liquid flows back into the liquid channel B The back end of the shear plunger is subjected to backward force, the shear plunger is sheared, the shear plunger is moved backward, the front end of the recoil section is moved behind the pressure relief hole, and the fluid channel B is connected to the outside through the pressure relief hole. Connected, the liquid is discharged from the pressure relief hole;

2. The shear pin can fix the shear plunger before stopping the drilling, so that the liquid channel B is separated from the pressure relief hole to ensure that the liquid flows forward from the liquid channel A;

3. The lock body and the connecting pipe are threaded, and the shear pin hole is at the thread, which is convenient for installation and replacement of the shear pin.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of the choke module before stopping drilling;

FIG. 2 is a schematic diagram of the choke module after stopping drilling; FIG.

Figure 3 is a schematic diagram of the pressure relief module before stopping;

4 is a schematic diagram of the pressure relief module after stopping drilling;

In the figure: 1-valve housing, 11-sealing section, 12-diversion section, 13-locking section A, 131-locking groove A, 2-locking shell, 21-inflow section, 22-outflow section, 221 -Outflow hole, 23-locking section B, 231-locking hole, 232-locking ball, 3-locking sleeve, 31-impact section, 32-locking section C, 321-locking groove B, 322- Seal groove C, 33-spring, 4-retaining ring, 41-retaining ring, 5-outer cylinder, 51-safety gear, 511-clamping portion, 512-squeezing portion, 6-center rod, 61-limiting head , 71-lock body, 711- shear pin hole, 712-sealing groove B, 72-connecting pipe, 721- connecting section, 722- pressure relief section, 7221-pressure relief hole, 7222-guide groove, 723-blocking flow Section, 81-lock lever, 811-inflow hole, 82-lock pin, 821-connection, 822-working section, 9-shear plunger, 91-shear section, 911-shear pin groove, 92- recoil Section, 921-seal groove A, 101-fluid channel A, 102-fluid channel B, 103-fluid channel C.

detailed description

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 to FIG. 4, the automatic ending mechanism of the core drilling rig disclosed in the present invention includes a flow blocking module, a pressure relief module and a center rod 6, and the flow blocking module is in front of the pressure relief module;

Flow blocking module: includes valve housing 1, lock housing 2, lock sleeve 3, fixed ring 4 and outer tube 5, center rod 6, valve housing 1, lock housing 2, lock sleeve 3, fixed ring 4 and outer The cylinder 5 is coaxial, and the central rod passes 6 through the inner cavity of the valve housing 1. The valve housing 1 is inside the lock housing 2, the lock housing 2 passes through the inner cavity of the lock sleeve 3, and the lock housing 2 has a lock ball 232. The housing 2 and the valve housing 1 are locked or released by a lock ball 232, and the lock housing 2 and the lock sleeve 3 are locked or released by a lock ball 232. Before stopping drilling, the lock housing 2 and the valve housing 1 are locked The outer cylinder 5 has a built-in safety gear 51. When the outer cylinder 5 moves forward to a limited position, the outer cylinder 5 drives the safety gear 51 to hit the lock sleeve 3, so that the lock ball 232 moves outward, and the valve housing is released. Constrained by the body 1, the valve housing 1 moves forward, closes the liquid flow path, and stops drilling.

The center rod 6 has an outer diameter of 20mm, and the valve housing 1 includes a sealing section 11, a diversion section 12 and a locking section A13 from back to front. The total length of the valve housing 1 is 119.5mm, the sealing section 11 has an outer diameter of 32mm and an inner diameter of 22mm. , 20mm in length, the inner wall of the rear end of the sealing section 11 has a protrusion A inward, the inner diameter of the protrusion A is 21mm, the outer diameter of the diversion section 12 is 25.7mm, the inner diameter is 22mm, and the length is 26mm. The inner wall of the front end of the diversion section 12 is inward. There are protrusions B, the inner diameter of the protrusion B is 21mm, the outer diameter of the locking section A13 is 32mm, the inner diameter is 22mm, the outer wall of the diversion section 12 and the sealing section 11 and the outer wall of the locking section A13 pass through the radial section 45 ° Inclined connection at an angle, the outer wall of the locking section A13 is provided with a locking groove A131, the locking groove A131 is an annular groove, the locking groove A131 is 3.15mm deep, the locking groove A131 groove bottom is 5mm wide, and the locking groove A131 groove bottom The front end is 10 mm away from the front end of the valve housing 1, and the outer wall of the locking section A13 and the groove bottom of the locking groove A131 are connected by an inclined surface at an angle of 45 ° with a radial section.

The lock housing 2 includes an inflow section 21, an outflow section 22, and a locking section B23 from back to front. The inflow section 21 has an outer diameter of 50mm, an inner diameter of 40mm, and a length of 30mm. The outflow section 22 has an outer diameter of 50mm, an inner diameter of 32mm, a length of 18mm, and an inflow section 21. The inner wall and the inner wall of the outflow section 22 are connected by a bevel. The outflow section 22 is provided with an outflow hole 221 having an aperture of 8mm, the outflow hole 221 is a through hole, and there are eight outflow holes 221, which are evenly distributed along the circumference of the outflow section in the same axial position. The axial distance from the center of the hole 221 to the front end of the outflow section 22 is 8.5mm. The outer diameter of the locking section B23 is 46mm and the inner diameter is 32mm. The locking section B23 has a locking hole 231, and the locking hole 231 is a through hole. The hole diameter of the tightening hole 231 is 10.1mm. There are three locking holes 231. The locking holes 231 are evenly distributed along the circumference of the locking section B23 at the same axial position. The axial distance from the center of the locking hole 231 to the front end of the outflow section 22 is 60mm, the outer wall of the locking section B23 is also provided with an annular card slot, the rear end of the card slot is 20mm away from the front end of the outflow section 22, the card slot width is 2mm, the card slot depth is 1.5mm, and the lock hole 231 has a lock Ball 232, locking ball 232 is a steel ball, diameter of locking ball 232 is greater than depth of locking hole 231, locking groove A131 groove bottom to locking section B23 From the wall is less than the diameter of the locking ball 232, the locking groove A131 B23 locking portion from the bottom to the outer wall 232 is not less than the diameter of the locking ball.

Locking sleeve 3 has an outer diameter of 65mm and a length of 133mm. The locking sleeve 3 includes an impact section 31 and a lock section C32 from back to front. The inner diameter of the impact section 31 is 59.3mm and a length of 20mm. The impact section 31 and the lock section C32 There is a snap ring segment, the inner diameter of the snap ring segment is 56mm, the length is 2mm, the inner diameter of the locking segment C32 is 46mm, the inner wall of the locking segment C32 has a locking groove B321, and the axial distance from the center of the locking groove B321 to the rear end of the impact section 31 is 40mm, locking groove B321 is an annular groove, the bottom of the locking groove B321 is 6.5mm wide, the depth of the locking groove B321 is 3.5mm, and the angle between the bottom of the locking groove B321 and the outer wall of the locking section C32 is 45 ° Inclined connection, the locking section C32 is provided with a sealing groove C322, the sealing groove C322 has a sealing ring, the sealing groove C322 is behind the locking groove B321, the front end of the sealing groove C322 is 28.4mm from the rear end of the impact section 31, and the width of the sealing groove C322 It is 3.4mm. The front end of the locking section C32 is supported by the spring 33. The distance from the bottom of the locking groove B321 to the outer wall of the locking section B23 is smaller than the diameter of the locking ball 232. The distance from the bottom of the locking groove B321 to the inner wall of the locking section B23 is not Less than the diameter of the locking ball 232.

The fixing ring 4 is a steel ring. The fixing ring 4 has an outer diameter of 58.7mm, an inner diameter of 46mm, and a length of 20mm. The outer wall of the fixing ring 4 has a non-slip pattern. The fixing ring 4 is fixed to the outer wall of the locking section B23. The front end of segment 22 is in contact. The front end of the fixing ring 4 is fixed by the retaining ring 41 partially embedded in the retaining groove of the outer wall of the locking segment B23. The locking hole 231 and the locking segment C32 are in front of the fixing ring 4. The outer diameter of the retaining ring 41 is larger than the inner diameter of the fixing ring 4. The inner diameter of the snap ring 41 is smaller than the inner diameter of the fixed ring 4. The fixed ring 4 is caught between the ring 41 and the front end of the outflow section 22. Before the drilling is stopped, the rear end of the impact section 31 is flush with the rear end of the fixed ring 4.

The inner diameter of the outer cylinder 5 is 80mm. The inner wall of the outer cylinder 5 is connected with a safety gear 51. The outer diameter of the safety gear 51 is 86mm. The safety gear 51 includes a clamping portion 511 and a pressing portion 512 from rear to front. The inner diameter of the front surface of the clamping portion 511 It is 55mm in length, 10mm in length, the inner diameter of the front end surface of the pressing portion 512 is 60.4mm, and the length is 20mm. The front end of the pressing portion 512 is also connected with a front convex portion, the inner diameter of the front convex portion is 70mm, and the length is 10mm.

The front end of the center rod 6 is connected with a limiting head 61, the limiting head 61 is in the locking section B23, the limiting head 61 is in front of the locking section A13, the outer diameter of the limiting head 61 is 31 mm, and the rear end of the outer wall of the limiting head 61 and the center The front end of the outer wall of the rod 6 is connected by a 45 ° inclined surface with a radial cross-section. The axial distance from the front end surface of the clamping portion 511 to the front end surface of the pressing portion 512 is equal to the distance from the center of the locking hole 231 to the center of the locking groove B321 before drilling is stopped. Axial distance, the distance from the rear end of the sealing section 11 to the back end of the outflow hole 221 before the drilling stop is greater than the axial distance from the locking hole 231 hole center to the center of the locking groove A131 after the drilling stop is greater than the front end of the sealing section 11 to the outflow hole after drilling stop The distance of the front end of 221.

Pressure relief module: including lock pin 82, lock lever 81, connecting tube 72, lock body 71, and shear plunger 9, center rod 6, lock pin 82, lock lever 81, connecting tube 72, lock body 71, and shear column The plug 9 is coaxial, and the lock body 71 is connected to the rear of the connection tube 72. The lock pin 82 and the lock lever 81 are in the connection tube 72 and the lock body 71. The lock lever 81 is behind the lock pin 82. The shear plunger 9 is in the lock body 71 and The shearing plunger 9 is connected to the lock body 71 through a shear pin inside the connecting tube 72 and outside the lock lever 81.

The locking pin 82 has an inner diameter of 32mm and a length of 220mm. The locking pin 82 connects the part 821, the working part 822, and the insertion part in order from back to front. The connecting part 821 is 38mm long, the outer diameter of the connecting part 821 is 38mm, and the outer wall of the connecting part 821 has M40. × 1.5 thread, the area on the outer wall of the connection part 821 is not more than 8mm from the front end surface of the working part 822, the working part 822 is 63mm long and the outer diameter is 50mm, the outer wall of the working part 822 has a groove, and the bottom surface of the groove is away from the lock pin The distance between the 82 axis is 22.5mm, the distance between the front end of the connecting part 821 and the front end of the groove opening is 59mm, and the width of the groove opening is 25.5mm. The bottom surface of the groove is connected to the outer wall of the working part 822 through a slope with a horizontal angle of 45 °. The minister is 98mm and the outer diameter is 48mm.

The connecting portion 821 is threaded to the front end of the locking rod 81. The outer diameter of the locking rod 81 is 45 mm. The inner diameter of the locking rod 81 is larger than the outer diameter of the center rod 6. The side wall of the locking rod 81 is provided with an inflow hole 811 with a diameter of 16 mm. The inflow holes 811 are not in the same axial position. Any one of the inflow holes 811 is not on the same side of the lock lever 81. The two adjacent inflow holes 811 are circumferentially spaced by 90 °. The center rod 6 passes through the lock pin 82 and the inner cavity of the lock lever 81. .

The connection pipe 72 includes a connection section 721, a pressure relief section 722, and a flow blocking section 723 from back to front. The outside diameter of the connection section 721 is 91 mm, and the inner wall of the connection section 721 is threaded, and the outside diameter of the pressure relief section 722 is 94.5 mm. 722 has a pressure relief hole 7221, the pressure relief hole 7221 is a through hole, the pressure relief section 722 pressure relief hole 7221 has an inner diameter of 72mm in front, the pressure relief section 722 pressure relief hole 7221 has an inner diameter of 74mm behind, and the front surface of the pressure relief hole 7221 is The inner wall of the pressure section 722 is connected to the inclined surface with an angle of 76 ° in the radial section. The pressure relief hole 7221 is a strip-shaped hole. The pressure relief hole 7221 is arranged in the axial direction. The width of the pressure relief hole 7221 is 16 mm. It is a semi-circular arc surface with a radius of 8 mm. The outer wall of the connecting pipe 72 is provided with a diversion groove 7222. The diversion groove 7222 has a width of 15 mm and a depth of 5 mm. The diversion groove 7222 is disposed axially. Directly in front of the pressure relief hole 7221, the diversion groove 7222 communicates with the pressure relief hole 7221. There are two pressure relief holes 7221 and the diversion groove 7222, which are evenly distributed along the circumference. The inner diameter of the flow blocking section 723 is 50 mm and the outer diameter is 78 mm. The inner wall of the flow-blocking section 723 and the inner wall of the pressure-relief section 722 are connected by an inclined surface having an angle of 45 ° with a radial section.

The connecting section 721 is threadedly connected to the lock body 71. The front end of the lock body 71 is an external thread, and the rear end of the connecting tube 721 is an internal thread. The inner wall of the lock body 71 is provided with a shear pin hole 711 in the radial direction, and the shear pin hole 711 is a through hole. The hole 711 is at the thread of the lock body 71. The shear pin hole 711 has a shear pin. The length of the shear pin is greater than the depth of the shear pin hole 711. The inner wall of the lock body 71 is provided with a seal groove B712, a seal ring in the seal groove B712, and a seal groove B712 in In front of the shear pin hole 711, the shear plunger 9 is 191.5mm long and 53mm in diameter. The shear plunger 9 includes a shearing section 91 and a recoil section 92 from back to front. The outer diameter of the shearing section 91 is 65mm. The outer diameter of segment 91 is equal to the inner diameter of lock body 71. The outer diameter of recoil segment 92 is 72mm. The recoil segment 92 is 15mm long. Shear segment 91 has a shear pin groove 911 on the outer wall. The shear pin groove 911 is an annular groove. The shear pin groove 911 The width is 8mm. The front end of the shear pin groove 911 is 25.5mm away from the rear end of the shear plunger 9. The outer wall of the recoil section 92 is provided with a seal groove A921. The seal groove A921 has a seal ring. The width of the seal groove A921 is 5.5mm. The distance from the front end of the shear plunger 9 is 10.5mm. Before the drilling stop, the front end of the recoil section 92 is in front of the front of the pressure relief hole 7221. The inner end of the shear pin is embedded in the shear pin groove 911. After the drilling stop, the front end of the recoil section 92. 7221 distal relief behind the hole, shear the shear pin;

The liquid channel A101 is between the outer wall of the center rod 6 and the inner wall of the locking rod 81 and the lock pin 82, and the liquid channel B102 is between the inner wall of the shear plunger 9 and the inner wall of the connecting tube 72 and the outer wall of the locking rod 81 and the lock pin 82. Inflow section 21 Between the inner wall and the outer wall of the center rod 6, there is a liquid channel C103, the liquid channel A101 communicates with the liquid channel C103, the liquid channel A101 communicates with the liquid channel B102 through the inflow hole, and the liquid channel B102 communicates with the liquid supply device.

The front of the outer cylinder 5 is connected to the hydraulic motor rotor and the drill bit. When the rig is working, the outer cylinder 5 moves from back to front. The liquid channel B102 is connected to the rear mud pump. The liquid channel C103 communicates with the front hydraulic motor through the outflow hole 221. In the locking groove A131 and the locking hole 231, the valve housing 1 is restricted from moving forward, and the outer cylinder 5 drives the safety gear 51 to move forward until the safety gear 51 hits the locking sleeve 3, so that the locking groove B321 and the locking hole 231 are positive. Yes, the liquid in the liquid passage C103 hits the rear end of the valve housing 1 and squeezes the locking ball 232 into the locking groove B321. The valve housing 1 is released from restraint and moves forward. The sealing section 11 moves into the outflow section 22, blocking Cut off the passage between the liquid channel C103 and the outflow hole 221, cut off the liquid channel, the motor stops rotating, the liquid surges up, flows back to liquid channel B102, recoils the recoil section 31, moves the recoil section 31 backward, and cuts the shear pin , Communicates with the passage B102 and the pressure relief hole 7221, and releases the pressure through the pressure relief hole 7221.

Of course, the present invention may have various other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications according to the present invention, but these corresponding changes All modifications and variations shall fall within the protection scope of the appended claims.

Claims

An automatic ending mechanism for a core drilling rig is characterized in that it includes a flow blocking module, which includes a valve housing (1), a lock housing (2), and a trigger mechanism, a valve housing (1), and a lock housing ( 2) Coaxial with the trigger mechanism, the center rod (6) passes through the inner cavity of the valve housing (1), the valve housing (1) is inside the lock housing (2), and the valve housing (1) includes a seal from back to front Section (11) and diversion section (12), the lock housing (2) includes the inflow section (21) and the outflow section (22) from back to front, and there is a liquid channel C between the center rod (6) and the inflow section (21) (103), the inner diameter of the inflow section (21) is larger than the outer diameter of the seal section (11), the outer diameter of the seal section (11) is greater than the outer diameter of the diversion section (12), and the inner diameter of the outflow section (22) is equal to the seal section ( 11) Outer diameter, the outflow section (22) is provided with an outflow hole (221). Before drilling is stopped, the front end of the sealing section (11) is in communication with the outflow hole (221) in the liquid channel C (103) of the inflow section (21). Then, the sealing section (11) and the outflow section (22) are hermetically matched, and the liquid passage C (103) is isolated from the outflow hole (221).
The automatic ending mechanism for a core drilling rig according to claim 1, characterized in that the valve housing (1) further comprises a locking section A (13), a locking section A (13) and a diversion section (12) The front end is connected, the lock housing (2) includes a lock section B (23), the lock section B (23) is connected to the front end of the outflow section (22), and the trigger mechanism includes a lock sleeve (3), a fixing ring ( 4) Outer cylinder (5), locking section A (13) and locking section B (23), the lock housing (2) passes through the inner cavity of the locking sleeve (3), and the outer wall of the locking section A (13) is described A locking groove A (131) is opened, a locking hole (231) is provided on the locking section B (23), the locking holes (231) are all through holes, and a locking ball (232) is provided in the locking hole (231). , The diameter of the locking ball (232) is greater than the depth of the locking hole (231), the locking sleeve (3) includes the impact section (31) and the locking section C (32) from back to front, and the inner wall of the locking section C (32) There is a locking groove B (321), the distance from the bottom of the locking groove A (131) to the inner wall of the locking section B (23) is smaller than the diameter of the locking ball (232), and the locking groove A (131) groove The distance from the bottom to the outer wall of the locking section B (23) is not less than the diameter of the locking ball (232). The distance from the bottom of the locking groove B (321) to the outer wall of the locking section B (23) is less than the locking ball (232). ) Diameter, said locking groove B (321) groove bottom to locking The distance of the inner wall of the segment B (23) is not less than the diameter of the locking ball (232). The fixing ring (4) is fixed on the outer wall of the locking segment B (23). The fixing ring (4) is behind the locking hole (231). The inner diameter of the impact section (31) is larger than the outer diameter of the fixed ring (4), the locking section C (32) is in front of the fixed ring (4), and the inner diameter of the outer cylinder (5) is larger than the lock housing (2) and the locking sleeve (3) The outer diameter of the outer cylinder (5) is connected with a safety gear (51). The safety gear (51) includes a clamping portion (511) and a pressing portion (512) from the back to the front, and the front end of the pressing portion (512). The inner diameter of the face is smaller than the outer diameter of the impact section (31), the inner diameter of the pressing part (512) is not less than the outer diameter of the fixing ring (4), the inner diameter of the front face of the clamping part (511) is smaller than the outer diameter of the rear end face of the fixing ring (4), and the center rod (6) The front end is connected with a limiting head (61), the limiting head (61) is in the locking section B (23), the limiting head (61) is in front of the locking section A (13), and the limiting head (61) The gap between the outer wall and the inner wall of the lock housing (2) is smaller than the thickness of the front end of the locking section A (13), and the axial distance from the front end surface of the clamping portion (511) to the front end surface of the pressing portion (512) is equal to the locking hole before drilling ( 231) The axial distance from the center of the hole to the center of the locking groove B (321). The distance from the rear end of the sealing section (11) to the back end of the outflow hole (221) before drilling is greater than the locking hole (23) 1) The axial distance from the center of the hole to the center of the locking groove A (131) is greater than the distance from the front end of the sealing section (11) to the front end of the outflow hole (221) before stopping drilling.
The automatic ending mechanism for a core drilling rig according to claim 2, further comprising a pressure relief module, the pressure relief module is behind the choke module, and the pressure relief module includes a lock pin (82) and a lock lever (81) , Connecting tube (72), lock body (71) and shear plunger (9), center rod (6), lock pin (82), lock rod (81), connecting tube (72), lock body (71) Coaxial with the shear plunger (9), the lock pin (82) includes a connection part (821) and a work part (822) from back to front, and the connection part (821) is connected to the lock lever (81) and the center lever (6) Pass through the inner cavity of the locking pin (82) and the locking rod (81), the outer diameter of the central rod (6) is smaller than the inner diameter of the locking pin (82) and the locking rod (81), and an inflow hole (811) is formed in the side wall of the locking rod (81) ), The connecting pipe (72) includes the connecting section (721), the pressure relief section (722), and the blocking section (723) from back to front. The outer diameter of the working section (822) is equal to the inner diameter of the blocking section (723). The inner diameter of the section (723) is smaller than the inner diameter of the pressure relief section (722). The pressure relief section (722) has a pressure relief hole (7221). The pressure relief hole (7221) is a through hole. The connection section (721) and the lock body (71) Connection, the inner wall of the lock body (71) is radially opened with shear pin holes (711), the shear pin holes (711) have shear pins, the length of the shear pins is greater than the depth of the shear pin holes (711), and the shear plunger (9) The inner diameter is larger than the outer diameter of the lock pin (82) and the lock lever (81). The shear plunger (9) includes the shear section (91) and the recoil section (92) from the back to the front, and the outer diameter of the shear section (91). It is equal to the inner diameter of the lock body (71), and the outer diameter of the recoil section (92) is equal to the inner diameter of the front part of the pressure relief section (722) and the pressure relief hole (7221). The outer wall of the shear section (91) is provided with a shear pin groove (911). Before drilling, the front end of the recoil section (92) is in front of the front end of the pressure relief hole (7221), and the inner end of the shear pin is inserted into the shear pin slot (911). After stopping the drill, the front end of the recoil section (92) is at the pressure relief hole (7221) Front and rear

There is a liquid channel A (101) between the center rod (6), the lock rod (81) and the lock pin (82), the shear plunger (9), the connecting tube (72), the lock rod (81) and the lock pin ( 82) There is liquid channel B (102), and liquid channel A (101) communicates with liquid channel C (103). Liquid channel A (101) and liquid channel B (102) communicate through the inflow hole (811). B (102) communicates with the liquid supply equipment at the rear.
The automatic end mechanism of a core drilling rig according to claim 3, characterized in that the outer diameter of the outflow section (22) is larger than the outer diameter of the locking section B (23), and the inner diameter of the fixing ring (4) is equal to the locking section B ( 23) Outside diameter.
The automatic ending mechanism for a core drilling rig according to claim 4, further comprising a snap ring (41), the outer diameter of the snap ring (41) is larger than the inner diameter of the fixed ring (4), and the inner diameter of the snap ring (41) is smaller than the fixed ring (4) Inner diameter, the snap ring (41) is inserted into the snap groove on the outer wall of the locking section B (23), and the fixing ring (4) is snapped between the rear end of the snap ring (41) and the front end of the outflow section (22).
The automatic end mechanism of a core drilling rig according to claim 3, wherein a seal groove A (921) is opened on the outer wall of the recoil section (92), a seal ring is arranged in the seal groove A (921), and the lock The inner wall of the body (71) is provided with a seal groove B (712), a seal ring is arranged in the seal groove B (712), and the seal groove B (712) is in front of the shear pin hole (711).
The automatic ending mechanism for a core drilling rig according to claim 3, wherein the lock body (71) is screw-connected to the connecting pipe (72), the front end of the lock body (71) is externally threaded, and the connecting pipe (72) The end is an internal thread, the shear pin hole (711) is a through hole, the shear pin hole (711) is at the thread of the lock body (71), and the lock pin (82) is threadedly connected to the lock lever (81).
The automatic ending mechanism for a core drilling rig according to claim 3, wherein the shear pin groove (911), the locking groove A (131), and the locking groove B (321) are all annular grooves.
The automatic ending mechanism for a core drilling rig according to claim 3, wherein a diversion groove (7222) is opened on the outer wall of the connecting pipe (72), and the diversion groove (7222) is directly in front of the pressure relief hole (7221). The guide groove (7222) is axially arranged, and the guide groove (7222) is in communication with the pressure relief hole (7221).