CN106050222B

CN106050222B - Water plugging finding tubular column for open hole horizontal well

Info

Publication number: CN106050222B
Application number: CN201610586137.9A
Authority: CN
Inventors: 陈鹏; 田野; 赵旭亮; 赵平; 何传兴; 刘佳欣; 王俊英; 陈辽望; 胡燕; 江雪芹; 吕孝明; 马俊; 王晓亮
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2016-07-22
Filing date: 2016-07-22
Publication date: 2023-05-26
Anticipated expiration: 2036-07-22
Also published as: CN106050222A

Abstract

The application discloses a water shutoff tubular column is looked for to bore hole horizontal well includes: an oil pipe having a vertical well section and a horizontal well section; a release packer arranged at the vertical well section; the setting mechanism, the first packer, the sliding sleeve mechanism, the second packer and the plug are sequentially arranged on the horizontal well section; the setting mechanism and the first packer form a double-wall liquid flow channel; the double-wall liquid flow channel is communicated with or sealed with the interior of the oil pipe through the axial movement of the oil pipe; the sliding sleeve mechanism comprises an outer tube and a sliding sleeve which can horizontally slide in the outer tube; the sliding sleeve mechanism is provided with horizontal channels and radial channels which are not communicated with each other; the sliding sleeve is provided with a first position for blocking the radial channel and a second position for opening the radial channel; the horizontal passage communicates the second packer with the double-walled fluid passage; the radial passage can communicate the interior of the sliding sleeve mechanism with the exterior of the well.

Description

Water plugging finding tubular column for open hole horizontal well

Technical Field

The application relates to the field of oil exploitation, in particular to a water plugging pipe column for an open hole horizontal well.

Background

At present, in petroleum exploitation operation, partial open hole horizontal well faces the problem that water content rises rapidly and oil yield drops rapidly, so that early research on water shutoff, water shutoff and well completion modes of the open hole horizontal well of fractured carbonate is carried out, and the open hole horizontal well is an important measure for improving the yield of the horizontal well and realizing stable oil field yield. In order to realize the earlier-stage research, liquid in the open hole horizontal well section is pumped to the ground, the fluid property of the horizontal section is judged by testing water content, the temperature and pressure changes of different section liquids are obtained, and the crack development condition of the horizontal section is obtained, so that the property of a production zone is judged, and a basis is provided for the next measure of the horizontal section. However, the water shutoff technology for the naked eye horizontal well is still blank in China, and no mature water shutoff technology capable of being popularized and applied exists abroad.

In order to make up for the technical blank, a water finding pipe column for an open hole horizontal well is disclosed in Chinese patent ZL 201110345387.0, and the water finding pipe column solves the water finding problem, but the water finding pipe column disclosed in the patent is generally implemented by two pipe columns, and the water finding pipe column disclosed in the patent is implemented firstly, after a specific water outlet position is determined, the water blocking pipe column is implemented, so that the operation cost is increased, the operation period is prolonged, and the present invention provides an open hole horizontal well water finding and blocking integrated pipe column based on the related design, field experience and professional knowledge.

Disclosure of Invention

In view of the defects of the prior art, the purpose of the application is to provide the pipe column capable of realizing the functions of water finding and water shutoff of the open hole horizontal well in a segmented way, and the pipe column has the characteristics of high efficiency, high reliability, short operation period and two technological measures for finding and water shutoff by one pipe column.

In order to achieve the purpose, the application provides a water plugging pipe column for an open hole horizontal well,

in order to achieve the above-mentioned purpose, the application provides a bore hole horizontal well seek water shutoff tubular column, includes:

an oil pipe having a vertical well section and a horizontal well section;

a release packer arranged at the vertical well section;

the setting mechanism, the first packer, the sliding sleeve mechanism, the second packer and the plug are sequentially arranged on the horizontal well section;

the setting mechanism and the first packer form a double-wall liquid flow channel; the double-wall liquid flow channel is communicated with or sealed with the interior of the oil pipe through the axial movement of the oil pipe;

the sliding sleeve mechanism comprises an outer tube and a sliding sleeve which can horizontally slide in the outer tube; the sliding sleeve mechanism is provided with horizontal channels and radial channels which are not communicated with each other; the sliding sleeve is provided with a first position for blocking the radial channel and a second position for opening the radial channel; the horizontal passage communicates the second packer with the double-walled fluid passage; the radial passage can communicate the interior of the sliding sleeve mechanism with the exterior of the well.

Preferably, in the sliding sleeve mechanism, an inner sleeve, a fluid and a connector are fixedly arranged in the sliding sleeve; the inner part of the outer tube is reduced in diameter to form a reducing part; the lower end of the connector abuts against the end face of the reducing part; the sliding sleeve is sleeved in the connecting body; the overflow body is provided with a first through hole which horizontally penetrates through the overflow body; the diameter-changing part is provided with the radial channel and a second through hole which horizontally penetrates the radial channel;

the annular space between the inner sleeve and the outer tube, the annular space between the first through hole, the connecting body and the outer tube, and the second through hole Kong Shunci are communicated to form the horizontal channel.

Preferably, the inner tube is fixedly sleeved outside the sliding sleeve; the inner tube is positioned in the connecting body; the inner tube is provided with a track groove and is connected with a spring, and the connecting body is provided with a track nail extending into the track groove; the area of the upper end face of the sliding sleeve is larger than that of the lower end face of the sliding sleeve; the sliding sleeve can be switched between the first position and the second position through the cooperation of the track groove, the spring and the track nail.

Preferably, the track grooves comprise a switching groove, a first track groove extending along the axial direction of the inner tube and a second track groove extending along the axial direction of the outer tube; the first track groove and the second track groove are circumferentially spaced along the outer tube, and the first track groove, the second track groove and the spring are positioned at one side of the switching groove; the switching groove is used for communicating the first track groove with the second track groove; the spring gives the inner tube a force away from the switching groove along the axial direction of the outer tube;

the track nails can give the inner tube a force rotating along the circumferential direction of the outer tube when moving relative to the switching grooves, and the track nails are switched between the first track grooves and the second track grooves under the action of the springs;

the track nail is located at the first position when the track nail is located at the end part of the first track groove, which is far away from the switching groove, and the track nail is located at the second position when the track nail is located at the end part of the second track groove, which is far away from the switching groove.

Preferably, the switching groove, the first track groove and the second track groove are all multiple, and every two adjacent grooves in the first track groove and the second track groove are communicated through one switching groove.

Preferably, the first track grooves and the second track grooves are uniformly distributed at intervals along the circumferential direction of the inner tube.

Preferably, the switching groove is provided with an end part far away from the first track groove and the second track groove along the axial direction of the outer tube, and the switching groove comprises a first inclined edge opposite to the end part of the first track groove or the second track groove and a second inclined edge opposite to the end part of the switching groove along the axial direction of the outer tube; the first bevel edge is led into the end part of the track groove, and the second bevel edge is led into the first track groove or the second track groove.

Preferably, an inner plug is arranged between the sliding sleeve mechanism and the second packer, and a third through hole for communicating the horizontal channel and the second packer is arranged on the wall between the inner plug and the second packer.

Preferably, the ball rod seat is arranged in the oil pipe; the ball rod seat is arranged between the first packer and the sliding sleeve mechanism; the club seat can be matched with a club to be set.

Preferably, the oil pipe is further provided with at least one centralizer.

According to the open hole horizontal well water finding and plugging pipe column provided by the embodiment, the releasing packer is matched with the sliding sleeve mechanism, the sliding sleeve mechanism is utilized to determine the plugging of the radial channel by the action of the sliding sleeve mechanism after the oil layer is discharged, and finally the releasing packer is utilized to complete releasing, so that the open hole horizontal well water finding and plugging pipe column provided by the embodiment can realize the open hole horizontal well segmented water finding and plugging functions, and two technological measures for finding and plugging water can be realized by one pipe column.

Specific embodiments of the invention are disclosed in detail below with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not limited in scope thereby. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic diagram of a water plugging finding pipe column of an open hole horizontal well;

FIG. 2 is a schematic view of the setting mechanism of the present invention;

FIG. 3 is a schematic view of a first packer construction of the present invention;

FIG. 4 is an enlarged view of the portion A of FIG. 3;

FIG. 5 is a schematic view of a sliding sleeve mechanism according to the present invention;

FIG. 6 is a schematic view of the cross-sectional structure at A-A of FIG. 5;

FIG. 7 is a schematic view of the cross-sectional structure at B-B of FIG. 5;

FIG. 8 is a schematic diagram of the track groove structure of FIG. 5;

fig. 9 is a schematic view of the structure of the cue of the present invention.

Detailed Description

In order to better understand the technical solutions in the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are intended to be within the scope of the present invention based on the embodiments herein.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 9, an embodiment of the present application provides a water plugging pipe column for an open hole horizontal well, including: an oil pipe 1 with a vertical well section and a horizontal well section; a releasing packer 2 arranged at the vertical well section; the setting mechanism 4, the first packer 5, the sliding sleeve mechanism 6, the second packer 7 and the plug 14 are sequentially arranged at the tail end of the oil pipe 1; the setting mechanism 4 and the first packer 5 form a double-wall liquid flow channel; the double-wall liquid flow channel is communicated with the interior of the oil pipe 1 or is closed by the axial movement of the oil pipe 1; the sliding sleeve mechanism 6 comprises an outer tube 61 and a sliding sleeve 62 which can horizontally slide in the outer tube 61; the sliding sleeve mechanism 6 is provided with horizontal channels and radial channels 672 which are not communicated with each other; the sliding sleeve 62 has a first position blocking the radial channel 672 and a second position opening the radial channel 672; the horizontal channel communicates the second packer 7 with the double-walled flow channel; the radial channels 672 allow the interior of the slide mechanism 6 to communicate with the outside of the well.

When the open hole horizontal well of the present embodiment is used to find a water plugging string, the string is first lowered to the design position and the sliding sleeve 62 is positioned at the second position. First, the inner passage of the oil pipe 1 is plugged, the liquid is injected from the outside of the well and pressurized, and the liquid flows through the wall (wall-sandwiched liquid passage) of the setting mechanism 4 and enters the first packer 5. The first packer 5 is an expansion type packer, after the pressure reaches a certain value, the expansion setting can be performed, the open hole section is sealed, and liquid flow can enter a horizontal channel of the sliding sleeve mechanism 6 through a double-wall liquid flow channel and then enter the second packer 7, so that the second packer 7 is set, and a layer to be inspected can be clamped through the first packer 5 and the second packer 7. With sliding sleeve 62 in the second position, radial channel 672 in sliding sleeve mechanism 6 communicates its interior with the layer to be inspected. Then, the layer to be inspected is pumped by a pumping tool which is put into the oil pipe 1 from the outside of the well, and if the layer is discharged, the water enters the oil pipe 1 through the radial channel 672 holes of the sliding sleeve mechanism 6, and then the ground is pumped out. After the water outlet of the layer is determined, the pressure of the oil pipe 1 is increased outside the well, the sliding sleeve 62 of the sliding sleeve mechanism 6 is pushed to the first position, so that the radial channel 672 is closed through the sliding sleeve 62, at the moment, the water outlet layer (layer to be inspected) is separated from the inside of the oil pipe 1, the pressure of the oil pipe 1 is continuously increased, the releasing packer 2 is released, and the pipe column above the releasing packer 2 is taken out of the well, so that the water searching and plugging process is completed.

It can be seen from the above description that the open hole horizontal well water finding and plugging pipe column provided by the embodiment is matched with the sliding sleeve mechanism 6 by the releasing packer 2, the radial channel 672 is plugged by the action of the sliding sleeve mechanism 6 after the oil layer water is determined by the sliding sleeve mechanism 6, and finally the releasing is completed by the releasing packer 2, so that the open hole horizontal well water finding and plugging pipe column provided by the embodiment can realize the open hole horizontal well segmented water finding and plugging functions, and one pipe column can realize two technological measures of finding and plugging water.

In one embodiment, the release packer 2 may include a release portion (not shown), a packing portion (not shown), an anchor portion (not shown). The working state of the release packer 2 can be divided into a setting process, a release process, and a deblocking process. In the setting process, the releasing packer 2 is conveyed to a designed well section through the oil pipe 1, hydraulic pressure is added from the oil pipe 1, liquid enters the setting working cavity of the releasing packer 2, the connecting sleeve is pushed to move downwards, shear pins are sheared, a cone is pushed to move, the slips are propped open for anchoring, the locking piece is released when the connecting sleeve moves, the compression sleeve moves upwards, the rubber cylinder, sealing oil and the sleeve-shaped space are extruded, and the setting of the packer is completed. In the releasing process, after the packer is set, the packer is continuously pressurized, the releasing piston is hydraulically pushed to move, the shear pins are sheared, the releasing locking cylinder is moved, the locking block is released, and the releasing lower joint and the packer are left in the well, so that releasing is realized. In the deblocking process, the butt-buckling fishing spear is put into the releasing packer 2, the pipe column is pressed down, the split claws of the fishing spear enter the salvaging position at the upper part of the releasing packer 2, and the pipe column is lifted up to finish deblocking.

In one embodiment, both the setting mechanism 4 and the first packer 5 have a center tube connected to the tubing 1. The first central tube 11 is arranged in the setting mechanism 4, and the second central tube 12 is arranged in the first packer 5. The upper end of the first central tube 11 is connected with the oil tube 1, the lower end of the first central tube is connected with the second central tube 12, and the lower end of the second central tube 12 is connected with the sliding sleeve mechanism 6. The wall-clamping flow channel can be communicated or sealed with the inside of the oil pipe 1 through the axial movement of the central pipe, and the central pipe is connected with the oil pipe 1, so that the wall-clamping flow channel can be communicated or sealed with the inside of the oil pipe 1 only by pulling the oil pipe 1 or pushing the oil pipe 1 to realize the axial movement of the oil pipe 1.

Further, as shown in fig. 2, the setting mechanism 4 may include an outer sleeve 41 and an axial flow guiding channel 42, where the outer sleeve 41 is slidably sleeved on the outer side of the first central tube 11; the axial diversion channel 42 is axially arranged in the outer sleeve 41, the upper end of the axial diversion channel 42 is closed, and a liquid inlet through hole 43 is radially arranged on the pipe wall of the first central pipe 11, which is close to the upper end side of the axial diversion channel 42, so as to communicate the first central pipe 11 with the axial diversion channel 42, and the pressure liquid flowing into the first central pipe 11 can enter the axial diversion channel 42 through the liquid inlet through hole 43. When the axial diversion channel 42 is filled with enough pressure liquid, the first central tube 11 overcomes the resistance and descends relative to the outer sleeve 41 under the action of external force, so that the liquid inlet through hole 43 moves downwards to the lower side of the outer sleeve 41, and the liquid inlet through hole 43 is closed; when the pressure liquid needs to be discharged, the first central tube 11 moves upwards relative to the outer sleeve 41, so that the liquid inlet through hole 43 moves upwards and is communicated with the axial flow guide channel 42, and the liquid inlet through hole 43 is opened; thus, the opening or closing of the liquid inlet through hole 43 is controlled by the sliding of the first central tube 11 relative to the outer jacket 41.

Further, as shown in fig. 2, the setting mechanism 4 may further include: the first upper joint 44, the first lower joint 45, the coupling 46, the sheath 47, the connector 6548 and the guide member 49, the first upper joint 44 and the first lower joint 45 are respectively connected to two ends of the first central pipe 11, and the oil pipe 11 is connected with the first central pipe 11 through the first upper joint 44; the first central tube 11 is connected to the second central tube 12 by a first lower joint 45, so that the oil tube 11, the first central tube 11, and the second central tube 12 are connected. The collar 46 is sleeved outside the first lower joint 45 for connection with a first packer 55.

At least one centralizer is also arranged on the oil pipe 1. As shown in fig. 1, a horizontal well centralizer 3 is arranged between the releasing packer 2 and the setting mechanism 4, and the horizontal well centralizer 3 is positioned at a horizontal well section. A horizontal well centralizer 8 is arranged between the second packer 7 and the plug 14. The centralizer 8 may centralize the lost circulation string within the wellbore in a horizontal well section.

The first packer 5 and the second packer 7 are expansion packers, which are different from the release packer 2. The first packer 5 and the second packer 7 have only the setting and unsetting functions. And liquid is fed into the first packer 5 and the second packer 7 through the oil pipe 1, the double-wall liquid flow channel and the horizontal channel outside the well, so that the first packer 5 and the second packer 7 are inflated and sealed. The first packer 5 is a wall-clamping type packer, and the second packer 7 may be the same as the first packer 5 or different from the first packer 5.

In one embodiment, as shown in fig. 3 and 4, the first packer 55 may include: the first rubber cylinder 51 is sleeved outside the second central tube 12; a first axial gap 52 is formed between the first rubber sleeve 51 and the second central tube 12, and the first axial gap 52 is communicated with the axial diversion channel 42, so that pressure liquid enters the first axial gap 52 through the axial diversion channel 42 to expand the first packer 55, and a packing function is achieved.

Further, as shown in fig. 3, the first packer 55 may further include: the coupling 46 is connected with the first rubber cylinder 51 through the second upper joint 53, the external sleeve 54 and the connecting piece 55; the outer sleeve 54 is connected to the lower end of the first rubber cylinder 51; the connecting member 55 is connected between the outer jacket 54 and the fluid director 49.

The lower packer and the upper packer disclosed in the chinese patent ZL 201110345387.0 are the same wall-sandwiched type packer, and in actual production operation, the interval between the upper packer and the lower packer is as long as several hundred meters due to the separation of the whole layer to be inspected, and it is obvious that the axial channel of the flow dividing device of the chinese patent ZL 201110345387.0 cannot provide the length, even if the cost of providing the flow dividing device is huge, it is difficult to perform actual output, and if the oil pipe between the upper packer and the lower packer is a wall-sandwiched type oil pipe, no such type oil pipe is disclosed at present, and the manufacturing cost of producing such oil pipe is also huge, and it is also difficult to perform actual output.

In view of this problem, as shown in fig. 1, in the water finding and plugging string of the present embodiment, the oil pipe 1 is provided with an inner plug 9 between the sliding sleeve mechanism 6 and the second packer 7. The inner plug 9 divides the interior of the oil pipe 1 into two sections which are not communicated with each other at the position. The oil pipe 1 is provided with a third through hole (not numbered) communicating with the horizontal channel and the second packer 7 on the wall between the inner plug 9 and the second packer 7. The radial channel 672 communicates the inspection layer with the interior of the oil pipe 1 above the inner plug 9, and the third through hole communicates the horizontal channel with the interior of the oil pipe 1 below the inner plug 9 (in this embodiment, both the upper and lower sides may be opposite to the end of the oil pipe 1, i.e. the end relatively far from the oil pipe 1 is the upper side, and the end relatively close to the oil pipe 1 is the lower side). The setting liquid inlet of the second packer 7 is directly led into the oil pipe 1 without a wall. The pressurizing liquid enters the oil pipe 1 below the inner plug 9 through the double-wall liquid inlet channel, the horizontal channel and the third through hole and then enters the second packer 7, so that the second packer 7 can be inflated and sealed.

It can be seen that, in this embodiment, by setting the inner plug 9, the present embodiment can utilize the oil pipe 1 with a part of length to realize the flow channel of the setting fluid, which can reduce the cost, better adapt to the oilfield production field, and can be better applied to the oilfield actual production.

As shown in fig. 5 to 8, in the slide bush mechanism 6, an inner sleeve 68, a fluid 63, and a connecting body 65 are fixedly provided in the slide bush 62. The inner portion of the outer tube 61 is reduced in diameter to form a reduced diameter portion 67. The lower end of the connector 65 abuts against the end face of the variable diameter portion 67. The sliding sleeve 62 is sleeved in the connecting body 65. As shown in fig. 6, the fluid 63 is provided with a first through hole 631 horizontally penetrating therethrough. As shown in fig. 7, the diameter-changing portion 67 is provided with the radial passage 672 and a second through hole 671 horizontally penetrating it. The annular space between the inner sleeve 68 and the outer tube 61, the annular space between the first through hole 631, the connecting body 65 and the outer tube 61, and the second through hole 671 are sequentially communicated to form the horizontal passage.

Specifically, the inner sleeve 68, the fluid 63, and the connecting body 65 are all of a tubular structure and are sleeved outside the sliding sleeve 62. The fluid 63 is axially connected between the inner sleeve 68 and the connecting body 65 along the outer tube 61, and the fluid 63 may be fixedly connected, such as screwed, with the inner wall of the outer tube 61 to provide a fixed position for the inner sleeve 68 and the connecting body 65.

Further, an inner tube 69 is fixedly sleeved outside the sliding sleeve 62; the inner tube 69 is positioned within the connector 65. The inner tube 69 is provided with a track groove and is connected with a spring 66. The connecting body 65 is provided with a track nail 64 extending into the track groove. The upper end surface area of the sliding sleeve 62 is larger than the lower end surface area thereof. The sliding sleeve 62 is switchable between the first position and the second position by engagement of the track grooves, the springs 66, and the track pins 64. By means of the area difference between the upper end face and the lower end face of the sliding sleeve 62, the pressure of the upper end face of the sliding sleeve 62 is larger than that of the lower end face during pressurizing, so that the sliding sleeve 62 descends.

The track grooves include a switching groove, a first track groove extending axially along the inner tube 69, and a second track groove extending axially along the outer tube 61; the first track groove and the second track groove are circumferentially spaced along the outer tube 61, and the first track groove, the second track groove and the spring 66 are located at one side of the switching groove; the switching groove is used for communicating the first track groove with the second track groove; the spring 66 gives the inner tube 69 a force axially along the outer tube 61 away from the switch groove.

The track pin 64 can give the inner tube 69 a force rotating circumferentially along the outer tube 61 when the track pin 64 moves relative to the switching slot (in practice, the track pin 64 is fixed in position, and the switching slot and the track pin 64 are in relative motion), and the track pin 64 is switched between the first track slot and the second track slot by the action of the spring 66. Wherein the sliding sleeve 62 is in the first position when the track pin 64 is located at the end of the first track groove away from the switching groove, and the sliding sleeve 62 is in the second position when the track pin 64 is located at the end of the second track groove away from the switching groove.

In connection with the above description, when sliding sleeve 62 moves down under the action of pressure difference, it is switched from the first track groove (for example, the second track groove may be the second track groove at present) to the second track groove by means of the switching groove, and after stopping pressing, it is pushed by means of spring 66 to push sliding sleeve 62 up to make track nail 64 be located at the end position of the second track groove, so as to complete the switching between the first position and the second position.

Specifically, the side wall of the inner tube 69 is provided with a track groove, and the track groove may be an irregularly shaped through hole on the outer wall of the inner tube 69 or a groove formed by partially recessing the outer surface, which can allow the track nail 64 to extend into and limit the movement track of the track nail 64. The track groove may be provided near the upper end of the inner tube 69. By raising or lowering (left or right movement) the inner tube 69, the track pin 64 can be switched between a first position and a second position, so that it can be cycled for water exploration of different reservoirs.

Referring to fig. 8, the track grooves may include the switching groove 111, the first track groove 112, and the second track groove 113. The switching groove 111 communicates the first track groove 112 and the second track groove 113 in the circumferential direction of the inner tube 69. The first track groove 112 and the second track groove 113 extend along the axial direction of the inner tube 69, specifically, the first track groove 112 and the second track groove 113 extend toward the lower end 13 of the inner tube 69. The switching groove 111 communicates the first trajectory groove 112 with an end of the second trajectory groove 113 remote from the lower end of the inner tube 69.

The widths of the first track groove 112 and the second track groove 113 are adapted to the track nail 64, so as to ensure that the track nail 64 is circumferentially not swayed when being positioned in the first track groove 112 or the second track groove 113. The first track groove 112 and the second track groove 113 are spaced by a preset distance along the circumferential direction of the inner tube 69, where the preset distance is set according to the angle of the actual required orientation, for example: the angle corresponding to the preset distance may be 15 degrees, and thus the inner tube 69 rotates by 15 degrees when the track pin 64 is switched from the second track groove 113 to the first track groove 112.

Specifically, the switching groove 111 has an end portion distant from the first track groove 112 and the second track groove 113 in the axial direction of the inner tube 69. The switching groove 111 includes a first oblique side 1111 facing an end of the first track groove 112 or the second track groove 113 in the axial direction of the inner tube 69, and a second oblique side 1112 facing an end of the switching groove 111. The first oblique side 1111 opens into the end of the track groove, and the second oblique side 1112 opens into the first track groove 112 or the second track groove 113. The first inclined edge 1111 and the second inclined edge 1112 intersect with the axis of the inner tube 69, so that the first inclined edge 1111 and the second inclined edge 1112 give a certain force component to the track pin 64 along the circumferential direction of the inner tube 69 when the track pin 64 moves axially along the inner tube 69.

Taking fig. 8 as an example, the end position of the switching groove 111 is a point a, the end position of the first track groove 112 away from the switching groove 111 is a point B, the end position of the second track groove 113 away from the switching groove 111 is a point C, and an included angle between the point C and the point B is 60 degrees. When the water plugging string is lowered to the specified position, the track nail 64 is located at the position B, at this time, the well external oil pipe 1 presses and pushes the inner pipe 69 to descend, and then the track nail 64 ascends to the first inclined edge 1111, the first inclined edge 1111 gives the track nail 64 a force along the circumferential direction of the inner pipe 69, so that the track nail 64 moves along the circumferential direction of the inner pipe 69, at the same time, the trend of the track nail 64 ascending is not changed until the track nail 64 moves to the position a, at this time, the well is pressed, the track nail 64 ascends under the thrust of the spring 66, at this time, the track nail 64 descends to a second inclined edge 1112 opposite to the position a from the position a, and at this time, the second inclined edge 1112 also gives a force along the circumferential direction of the inner pipe 69 to the track nail 64, so that the track nail 64 moves along the circumferential direction of the inner pipe 69, at the same time, the trend of the track nail 64 descending along the inner pipe 69 is not changed until the track nail 64 enters the second track groove 113, and the track nail 64 continues to descend in the second track groove 113 until the track nail 64 is located at the position C62, and the radial sliding sleeve 62 is located at the position C.

The length of the first trajectory groove 112 in the axial direction of the inner tube 69 may be greater than the length of the second trajectory groove 113 in the axial direction of the inner tube 69. This allows the inner tube 69 to move downward a distance as the track pin 64 is transferred from the first track slot 112 to the second track slot 113, thereby blocking the radial channel 672. That is, the first position is the end of the first trajectory groove 112, and the second position is the end of the second trajectory groove 113 is the end of the trajectory nail 64.

The number of the switching grooves 111, the number of the first track grooves 112 and the number of the second track grooves 113 are all plural, and every two adjacent grooves in the first track grooves 112 and the second track grooves 113 are communicated through one switching groove 111. The ends of all the switching grooves 111 are inclined the same to ensure that the moving direction of the track pins 64 is uniform. Further, the first track grooves 112 and the second track grooves 113 may be uniformly spaced apart along the circumference of the inner tube 69. As shown in fig. 8, the number of the switching grooves 111 is 2 times the number of the first track grooves 112 and the second track grooves 113. In fig. 8, the number of the switching grooves 111 is 6, and the number of the first track grooves 112 and the second track grooves 113 is 3.

As shown in fig. 1, in this embodiment, the open hole horizontal well water logging string may further include a club seat 15 disposed in the oil pipe 1. The ball rod seat 15 is arranged between the first packer 5 and the sliding sleeve mechanism 6. The club seat 15 is capable of being set in cooperation with a club 10. By setting the ball seat 15 with the ball rod 10, unnecessary movements of the sliding sleeve mechanism 6 when the first packer 5 and the second packer 7 are set can be prevented.

Further, as shown in fig. 9, the cue 10 may include a leather cup 15, a central rod 16 and a tail plug 17 connected in sequence, a protrusion 18 is provided on the central rod 16, a pawl spring 19 is sleeved outside the central rod 16, the pawl spring 19 is matched with the protrusion 18 and can slide axially along the central rod 16, and the pawl spring 19 is connected with the central rod 16 through a shear pin 20. After the cue 10 is put into the central tube, a first setting part 21 matched with the cue 10 is arranged at the lower part of the first central tube 11, and the first setting part 21 is positioned at the lower side of the liquid inlet through hole 43; the cue 10 falls down, and a second setting part 22 matched with the cue 10 is arranged at the bottom of the connecting sleeve 65 of the diversion device 6, so that the cue 10 can realize setting of a central pipe at the first setting part 21 and the second setting part 22. In use, the cue stick 10 is thrown into the central tube and is first set in the first setting section 21; after the packing is completed, the central rod 16 transmits the external force to the shear pin 20 under the pushing of the external force, when the external force reaches the rated value of the shear pin 20, the shear pin 20 is sheared, the central rod 16 descends, the claw springs 19 are separated from the convex parts 18, the claw springs 19 are compressed and contracted, the ball rod 10 can pass through the first setting part 21 and fall to the second setting part 22 to realize setting, and liquid in a water finding well section of a horizontal well to be tested is ensured to be blocked in the central pipe, so that extraction operation is performed.

The invention aims at an open hole horizontal well with high water content, divides the horizontal well section into a plurality of target horizontal sections according to geological analysis and the like, then utilizes an oil pipe 1 to lower a first packer 5, a second packer 7 and a matched tool (comprising a sliding sleeve mechanism 6) into a designed well section, utilizes a suction tool to produce, and determines the fluid property of the horizontal section by testing the water content.

The working principle of the present application will be described in detail below: the well is run from the lowest layer to be inspected according to the water finding and plugging tubular column connected in fig. 1. During the down-hole process, the radial channel 672 of the sliding sleeve mechanism 6 communicates the inside and the outside of the oil pipe 1, and the sliding sleeve 62 is in the second position, so that the same annular pressure of the oil pipe 1 and the oil sleeve is ensured. After the pipe column is lowered to a preset position, a club is thrown into the well, and after the club is seated on a club seat, the interior of the oil pipe 1 is pressurized. At this point, as shown by the arrows in FIG. 1, the fluid flow enters the first packer 5 through the setting mechanism 4 and then through the sliding sleeve mechanism 6 into the tubing 1 space between the inner plug 9 and the plug 14. The first packer 5 and the second packer may be set at this point. The first packer 5 and the second packer 7 clamp the layer to be inspected, the lifting pipe column and the liquid inlet of the setting mechanism 4 are closed, the liquid in the first packer 5 and the second packer 7 is locked, and the first packer 5 and the second packer 7 can keep the setting state. Then a suction tool is placed into the water finding and plugging tubular column, at the moment, the radial channel 672 of the sliding sleeve mechanism 6 is in an open state (not plugged by the sliding sleeve 62), and whether water is discharged from the layer can be judged through the volume of liquid pumped to the ground. If water is not discharged, the water plugging pipe column is pressed down, the liquid inlet hole of the setting mechanism 4 is opened, the liquid in the first packer 5 and the second packer 7 is released, and the first packer 5 and the second packer 7 realize deblocking. Lifting the water plugging pipe column, lifting the water plugging pipe column to the last layer to be inspected, and repeating the last operation procedure. If the water injection of the layer is judged, a water blocking process is required to be implemented. Firstly, the pressure in the oil pipe 1 is increased, a ball rod is knocked off, the pressure in the oil pipe 1 is continuously increased, the difference between the upper end face and the lower end face of the sliding sleeve 62 of the sliding sleeve mechanism 6 starts to work under the action of pressure, the sliding sleeve 62 is pushed to switch to a first position, the sliding sleeve 62 closes a radial channel 672, at the moment, a water layer is clamped through a first packer 5 and a second packer 7, the oil pipe 1 and an oil sleeve annulus are sealed through closing the radial channel 672, and the purpose of blocking the water layer is achieved. And then continuously increasing the pressure, setting the hydraulic release on the upper part, releasing the hydraulic release, and lifting the upper pipe column into the well to complete the whole water finding and plugging process.

Any numerical value recited herein includes all values of the lower and upper values that increment by one unit from the lower value to the upper value, as long as there is a spacing of at least two units between any lower value and any higher value. For example, if it is stated that the number of components or the value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, then the purpose is to explicitly list such values as 15 to 85, 22 to 68, 43 to 51, 30 to 32, etc. in this specification as well. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples that are intended to be explicitly recited in this description, and all possible combinations of values recited between the lowest value and the highest value are believed to be explicitly stated in the description in a similar manner.

Unless otherwise indicated, all ranges include endpoints and all numbers between endpoints. "about" or "approximately" as used with a range is applicable to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30," including at least the indicated endpoints.

All articles and references, including patent applications and publications, disclosed herein are incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not substantially affect the essential novel features of the combination. The use of the terms "comprises" or "comprising" to describe combinations of elements, components, or steps herein also contemplates embodiments consisting essentially of such elements, components, or steps. By using the term "may" herein, it is intended that any attribute described as "may" be included is optional.

Multiple elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, component, section or step is not intended to exclude other elements, components, sections or steps.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of completeness. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to forego such subject matter, nor should the inventors regard such subject matter as not be considered to be part of the disclosed subject matter.

Claims

1. The utility model provides a water pipe column is looked for to bore hole horizontal well which characterized in that includes:

an oil pipe having a vertical well section and a horizontal well section;

a release packer arranged at the vertical well section;

the sliding sleeve mechanism comprises an outer tube and a sliding sleeve which can horizontally slide in the outer tube; the sliding sleeve mechanism is provided with horizontal channels and radial channels which are not communicated with each other; the sliding sleeve is provided with a first position for blocking the radial channel and a second position for opening the radial channel; the horizontal passage communicates the second packer with the double-walled fluid passage; the radial channel can communicate the interior of the sliding sleeve mechanism with the outside of the well;

an inner plug is arranged between the sliding sleeve mechanism and the second packer, and a third through hole for communicating the horizontal channel and the second packer is arranged on the wall between the inner plug and the second packer;

in the sliding sleeve mechanism, an inner sleeve, a fluid and a connector are fixedly arranged in the sliding sleeve; the inner part of the outer tube is reduced in diameter to form a reducing part; the lower end of the connector abuts against the end face of the reducing part; the sliding sleeve is sleeved in the connecting body; the overflow body is provided with a first through hole which horizontally penetrates through the overflow body; the diameter-changing part is provided with the radial channel and a second through hole which horizontally penetrates the radial channel;

the annular space between the inner sleeve and the outer tube, the annular space between the first through hole, the connecting body and the outer tube and the second through hole Kong Shunci are communicated to form the horizontal channel;

the ball rod seat is arranged in the oil pipe; the ball rod seat is arranged between the first packer and the sliding sleeve mechanism; the club seat can be matched with a club to be set.

2. The tubing string of claim 1, wherein: an inner pipe is fixedly sleeved outside the sliding sleeve; the inner tube is positioned in the connecting body; the inner tube is provided with a track groove and is connected with a spring, and the connecting body is provided with a track nail extending into the track groove; the area of the upper end face of the sliding sleeve is larger than that of the lower end face of the sliding sleeve; the sliding sleeve can be switched between the first position and the second position through the cooperation of the track groove, the spring and the track nail.

3. The tubing string of claim 2, wherein: the track grooves comprise switching grooves, first track grooves extending along the axial direction of the inner tube and second track grooves extending along the axial direction of the outer tube; the first track groove and the second track groove are circumferentially spaced along the outer tube, and the first track groove, the second track groove and the spring are positioned at one side of the switching groove; the switching groove is used for communicating the first track groove with the second track groove; the spring gives the inner tube a force away from the switching groove along the axial direction of the outer tube;

4. A pipe string as claimed in claim 3, wherein: the switching grooves, the first track grooves and the second track grooves are all multiple, and every two adjacent grooves in the first track grooves and the second track grooves are communicated through one switching groove.

5. The tubing string of claim 4, wherein: the first track grooves and the second track grooves are uniformly distributed at intervals along the circumferential direction of the inner tube.

6. A pipe string as claimed in claim 3, wherein: the switching groove is provided with end parts far away from the first track groove and the second track groove along the axial direction of the outer tube, and comprises a first inclined edge and a second inclined edge, wherein the first inclined edge is opposite to the end parts of the first track groove or the second track groove along the axial direction of the outer tube, and the second inclined edge is opposite to the end parts of the switching groove; the first bevel edge is led into the end part of the track groove, and the second bevel edge is led into the first track groove or the second track groove.

7. The tubing string of claim 1, wherein: and at least one centralizer is further arranged on the oil pipe.