阅读说明：本技术 可重复开关电动滑套及矿井注气管路更换保护液的方法 (Method for repeatedly opening and closing electric sliding sleeve and replacing protective liquid for mine gas injection pipeline ) 是由 张立义 胡承军 潘竟军 李纲要 黄建波 王如燕 李家燕 常智勇 王金龙 王柳斌 于 2018-07-17 设计创作，主要内容包括：本发明提供了一种可重复开关电动滑套及矿井注气管路更换保护液的方法。其中,可重复开关电动滑套包括：外管体,外管体具有第一开孔；旋套,旋套枢转设置在外管体内且能够封堵第一开孔,旋套具有第二开孔,当旋套转动时,第一开孔和第二开孔能够对接以使旋套内部与外管体外部连通,旋套靠近矿井的井口的一端具有与测调仪配合的连接结构,通过测调仪带动旋套转动。本发明解决了现有技术中的反循环滑套的可靠性低的问题。(The invention provides a method for repeatedly opening and closing an electric sliding sleeve and replacing a protective liquid for a mine gas injection pipeline. Wherein, repeatedly electronic sliding sleeve of switch includes: an outer tube body having a first opening; the rotary sleeve is arranged in the outer pipe body in a rotating mode and can block the first opening, the rotary sleeve is provided with the second opening, when the rotary sleeve rotates, the first opening and the second opening can be in butt joint to enable the rotary sleeve to be communicated with the outer pipe body, one end, close to a well mouth of a mine, of the rotary sleeve is provided with a connecting structure matched with a measuring and adjusting instrument, and the rotary sleeve is driven to rotate through the measuring and adjusting instrument. The invention solves the problem of low reliability of the reverse circulation sliding sleeve in the prior art.)

1. A repeatable on-off electrical sliding sleeve for a gas injection line of a mine, comprising:

an outer tube (10), the outer tube (10) having a first aperture (11);

revolve cover (20), revolve cover (20) pivot setting and be in just can the shutoff in outer body (10) first trompil (11), revolve cover (20) and have second trompil (21), work as when revolve cover (20) and rotate, first trompil (11) with second trompil (21) can the butt joint so that revolve cover (20) inside with outer body (10) outside intercommunication, revolve cover (20) be close to the one end of the well head of mine have with survey and transfer appearance complex connection structure (22), through survey and transfer the appearance drive revolve cover (20) and rotate.

2. The repeatable on-off electric sliding sleeve according to claim 1, wherein the rotating sleeve (20) has a blocking section (23) and a connecting section (24), the blocking section (23) has the second opening (21), the connecting section (24) has the connecting structure (22), and the diameter of the blocking section (23) is larger than that of the connecting section (24).

3. The repeatedly-openable electric sliding sleeve as claimed in claim 1, wherein the connecting structure (22) is a plurality of clamping grooves, and the clamping grooves are arranged at intervals along the circumferential direction of the rotating sleeve (20).

4. The re-closable electric sliding sleeve according to claim 3, wherein the clamping groove is communicated with the end of the rotating sleeve (20) close to the wellhead.

5. The re-closable electrical sliding sleeve according to claim 1,

the number of the first open holes (11) is multiple, and the first open holes (11) are arranged at intervals along the circumferential direction of the outer pipe body (10); and/or

The second open pore (21) is a plurality of, and each second open pore (21) along swivel nut (20) circumference interval sets up.

6. The re-closable electrical sliding sleeve according to claim 1, further comprising:

a first joint (30), at least a part of the first joint (30) is sleeved in the outer pipe body (10) and is abutted with the rotary sleeve (20);

and at least one part of the second joint (40) is sleeved in the outer pipe body (10) and is abutted against one end, far away from the first joint (30), of the rotary sleeve (20).

7. The re-switchable electrical sliding sleeve according to claim 6, further comprising a seal (50), the seal (50) being disposed between the first joint (30) and/or the second joint (40) and the outer body (10).

8. A method of replacing a protection liquid in a gas injection pipeline of a mine, wherein a repeatable on-off electric sliding sleeve according to any one of claims 1 to 7 is provided in the mine, the method comprising:

step S1: descending a measuring and adjusting instrument into the mine until a short-distance magnetic positioning peak appears in the measuring and adjusting instrument, wherein the measuring and adjusting instrument is positioned in a rotary sleeve (20) of the electric sliding sleeve capable of being repeatedly opened and closed;

step S2: opening an adjusting claw of the measuring and adjusting instrument, and adjusting the measuring and adjusting instrument to enable the adjusting claw to extend into a connecting structure (22) of the rotary sleeve (20);

step S3: introducing a protective liquid into a gap between the outer pipe body (10) of the electric sliding sleeve capable of being repeatedly opened and closed and the inner wall of the mine or the rotary sleeve (20), and controlling the measuring and adjusting instrument to rotate to drive the rotary sleeve (20) to rotate until a second opening (21) of the rotary sleeve (20) is aligned with a first opening (11) of the outer pipe body (10) so that the gap is filled with the protective liquid;

step S4: after the protection solution is replaced, the measuring and adjusting instrument is controlled to rotate to drive the rotary sleeve (20) to rotate, so that the second opening (21) and the first opening (11) are staggered, and the rotary sleeve (20) is used for sealing the first opening (11).

9. The method for replacing the protective solution in the gas injection pipeline of the mine shaft according to claim 8, wherein in the step S2, the tuning instrument is lifted to the position above the rotary sleeve (20) so that the distance between the tuning instrument and the rotary sleeve (20) is 1m to 3m, then the adjusting claw is opened, the tuning instrument is placed down until the tuning instrument is in the state of being blocked, and at the moment, the adjusting claw is completely butted with the connecting structure (22), and if the state of being blocked does not occur, the process is repeated until the tuning instrument is in the state of being blocked.

10. The method for replacing a protective liquid in a mine gas injection pipeline according to claim 8, wherein in the step S3, the protective liquid is introduced into the gap and flows out through the swivel sleeve (20).

11. The method for replacing the protection solution in the gas injection pipeline of the mine as claimed in claim 10, wherein in the step S3, the pressure in the gap is maintained at 2MPa to 4MPa, and then the measuring and adjusting instrument is controlled to rotate the swivel sleeve (20) until the pressure value in the gap is reduced, at which time the first opening (11) is partially communicated with the second opening (21), and the swivel sleeve (20) is continuously rotated until the first opening (11) is completely butted with the second opening (21).

12. The method for changing the protection liquid in the gas injection pipeline of the mine shaft as claimed in claim 11, wherein 13m is added into the gap after the first opening (11) is completely butted with the second opening (21)³H to 17m³The discharge volume of the/h is introduced into the protective liquid, and the volume of the introduced protective liquid is 1.3 times to 1.8 times of the clearance.

13. The method of claim 12, wherein the displacement is 15m³H; and/or the volume of the protective liquid is 1.5 times of the gap.

14. The method for replacing the protection liquid in the gas injection pipeline of the mine shaft according to claim 8, wherein in the step S4, after the protection liquid is replaced, the measuring and adjusting instrument is controlled to rotate to drive the rotating sleeve (20) to rotate until the pressure value in the gap reaches 2MPa to 4MPa, and the rotating sleeve (20) is continuously rotated to enable the rotating sleeve (20) to block the first opening (11).

Technical Field

The invention relates to the technical field of oil field pipelines, in particular to a method for repeatedly opening and closing an electric sliding sleeve and replacing a protection liquid for a mine gas injection pipeline.

Background

In order to protect a casing, a reverse circulation valve sleeve is usually added above a casing protection packer for an injection well (such as a water injection well or a gas injection well) or a production well (such as a natural gas production well).

The conventional reverse circulation sliding sleeves are mainly divided into two types: one is a pressure control opening type reverse circulation sliding sleeve, and the other is a steel wire control opening type reverse circulation sliding sleeve.

The pressure control opening type reverse circulation sliding sleeve pushes the inner sliding sleeve to compress and launch upwards by means of the fact that the pressure of a casing pipe is larger than the pressure of an oil pipe (the external pressure of the sliding sleeve is larger than the internal pressure), so that a bypass is opened to achieve communication of the oil pipe, after the pressure of the casing pipe (the external pressure of the sliding sleeve) is relieved, the inner sliding sleeve descends under the action of a spring to close a circulation channel, and circulation protection liquid addition is completed. However, the pressure-opening reverse circulation sliding sleeve has the defect that when the designed opening force of the spring is small, the sliding sleeve is opened by mistake due to the fact that the sleeve pressure is too high due to the leakage of the packer and the like. When the design opening pressure of the internal spring is overlarge, the wellhead opening sleeve pressure is overlarge and even exceeds the bearing pressure of a gas production tree.

The steel wire control switch type reverse circulation sliding sleeve is characterized in that a steel wire vehicle is adopted on the ground to transfer a switch tool, the switch tool is matched with an inner sliding sleeve of the reverse circulation sliding sleeve, an inner sliding sleeve mode is struck by adopting rapid downward impact, the inner sliding sleeve is made to move downward, and the inside and the outside of the reverse circulation sliding sleeve are made to be communicated (an oil pipe and a sleeve are communicated). When the inner sliding sleeve is closed, the ground steel wire trolley is connected with the switch tool and moves down to the position below the reverse circulation sliding sleeve, then the switch tool is lifted upwards and matched with the inner sliding sleeve, the inner sliding sleeve moves upwards under the action of steel wire tension, and the circulation sliding sleeve is closed to seal the oil sleeve. Because the steel wire bearing capacity is limited, the inner sliding sleeve has the defects of not opening, not closing and the like.

Disclosure of Invention

The invention mainly aims to provide a method for repeatedly opening and closing an electric sliding sleeve and replacing a protection liquid for a mine gas injection pipeline, so as to solve the problem of low reliability of a reverse circulation sliding sleeve in the prior art.

To achieve the above object, according to one aspect of the present invention, there is provided a repeatable opening and closing electric sliding sleeve for a gas injection line of a mine, comprising: an outer tube body having a first opening; the rotary sleeve is arranged in the outer pipe body in a rotating mode and can block the first opening, the rotary sleeve is provided with the second opening, when the rotary sleeve rotates, the first opening and the second opening can be in butt joint to enable the rotary sleeve to be communicated with the outer pipe body, one end, close to a well mouth of a mine, of the rotary sleeve is provided with a connecting structure matched with a measuring and adjusting instrument, and the rotary sleeve is driven to rotate through the measuring and adjusting instrument.

Furthermore, the rotary sleeve is provided with a plugging section and a connecting section, the plugging section is provided with a second opening, the connecting section is provided with a connecting structure, and the diameter of the plugging section is larger than that of the connecting section.

Furthermore, the connecting structure is a plurality of clamping grooves which are arranged along the circumferential direction of the rotary sleeve at intervals.

Further, the clamping groove is communicated with the end part of the rotary sleeve close to the wellhead.

Furthermore, the first openings are multiple and are arranged at intervals along the circumferential direction of the outer pipe body; and/or the second open pore is a plurality of, and each second open pore is along rotating the cover circumference interval setting.

Further, the repeatable opening and closing electric sliding sleeve further comprises: at least one part of the first joint is sleeved in the outer tube body and is abutted with the rotary sleeve; at least one part of the second joint is sleeved in the outer tube body and is abutted with one end of the rotary sleeve far away from the first joint.

Further, the repeatable opening and closing electric sliding sleeve further comprises a sealing member, and the sealing member is arranged between the first joint and/or the second joint and the outer pipe body.

According to another aspect of the invention, there is provided a method for replacing a protective liquid in a gas injection pipeline of a mine, wherein the repeatable opening and closing electric sliding sleeve is arranged in the mine, the method comprises the following steps: step S1: the testing and adjusting instrument is put into a mine until a short-distance magnetic positioning peak appears in the testing and adjusting instrument, and the testing and adjusting instrument is positioned in a rotary sleeve of the electric sliding sleeve capable of being repeatedly opened and closed; step S2: opening an adjusting claw of the measuring and adjusting instrument, and adjusting the measuring and adjusting instrument to enable the adjusting claw to extend into the connecting structure of the rotary sleeve; step S3: introducing a protective liquid into a gap between an outer pipe body of the electric sliding sleeve capable of being repeatedly opened and closed and the inner wall of a mine or the rotary sleeve, and simultaneously controlling the measuring and adjusting instrument to rotate to drive the rotary sleeve to rotate until a second opening of the rotary sleeve is aligned with a first opening of the outer pipe body, so that the protective liquid is filled in the gap; step S4: after the protection liquid is replaced, the testing and adjusting instrument is controlled to rotate to drive the rotary sleeve to rotate, so that the second opening and the first opening are staggered, and the rotary sleeve seals the first opening.

Further, in step S2, the testing and adjusting instrument is lifted to the top of the rotary sleeve so that the distance between the testing and adjusting instrument and the rotary sleeve is 1m to 3m, then the adjusting claw is opened, the testing and adjusting instrument is lowered until the testing and adjusting instrument is in a resistance state, at this time, the adjusting claw is in butt joint with the connecting structure, and if the resistance state does not occur, the above process is repeated until the testing and adjusting instrument is in the resistance state.

Further, in step S3, a protective liquid is introduced into the gap and flows out through the sleeve.

Further, in step S3, the pressure in the gap is maintained at 2MPa to 4MPa, and then the dial gauge is controlled to rotate the rotating sleeve until the pressure in the gap is reduced, at which time the first opening is partially communicated with the second opening, and the rotating sleeve is continuously rotated until the first opening is completely butted with the second opening.

Further, after the first opening and the second opening are completely butted, 13m is arranged in the gap³H to 17m³The discharge volume of the/h is filled with the protective liquid, and the volume of the filled protective liquid is 1.3 times to 1.8 times of the clearance.

Further, the discharge capacity is 15m³H; and/or the volume of the protective liquid is 1.5 times the volume of the gap.

Further, in step S4, after the protection solution is completely replaced, the testing and adjusting instrument is controlled to rotate to drive the rotating sleeve to rotate until the pressure value in the gap reaches 2MPa to 4MPa, and the rotating sleeve continues to rotate to plug the first opening.

By applying the technical scheme of the invention, the rotary sleeve can rotate relative to the outer pipe body, when the inside and the outside of the outer pipe body need to be communicated, the first opening and the second opening can be communicated by butting the first opening and the second opening only by matching the measuring and adjusting instrument with the connecting structure of the rotary sleeve and controlling the rotary sleeve to rotate through the measuring and adjusting instrument, so that the rotary sleeve does not need to move up and down, the problem that the electric sliding sleeve capable of being repeatedly opened and closed is unreliable due to unstable opening and closing by adopting a steel wire or a spring is avoided, and the electric sliding sleeve capable of being repeatedly opened and closed can be effectively opened and closed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic structural view of a repeatable opening and closing electric sliding sleeve of the present invention;

FIG. 2 is a schematic view of the structure of the rotating sleeve of the re-openable and re-closable electric sliding sleeve of FIG. 1; and

fig. 3 shows a front cross-sectional view of the swivel sleeve of fig. 2.

Wherein the figures include the following reference numerals:

10. an outer tubular body; 11. a first opening; 20. screwing a sleeve; 21. a second opening; 22. a connecting structure; 23. a plugging section; 24. a connecting section; 30. a first joint; 40. a second joint; 50. and a seal.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, 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 application belongs.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

In order to solve the problem of low reliability of the reverse circulation sliding sleeve in the prior art, the invention provides a method for repeatedly opening and closing an electric sliding sleeve and replacing a protection liquid for a mine gas injection pipeline.

The repeatable-opening and closing electric sliding sleeve for the gas injection pipeline of the mine as shown in figure 1 comprises an outer pipe body 10 and a rotary sleeve 20, wherein the outer pipe body 10 is provided with a first opening 11; the rotary sleeve 20 is pivoted in the outer pipe body 10 and can block the first open pore 11, the rotary sleeve 20 is provided with a second open pore 21, when the rotary sleeve 20 rotates, the first open pore 11 and the second open pore 21 can be butted to enable the rotary sleeve 20 to be communicated with the outside of the outer pipe body 10, one end of the rotary sleeve 20 close to a wellhead of a mine is provided with a connecting structure 22 matched with a measuring and adjusting instrument, and the rotary sleeve 20 is driven to rotate through the measuring and adjusting instrument.

This embodiment is through setting up the rotary sleeve 20, make the rotary sleeve 20 can rotate for outer body 10, when needs communicate the inside and outside of outer body 10, only need to examine and transfer the appearance and the connection structure 22 cooperation back of rotary sleeve 20, rotate through examining and transferring appearance control rotary sleeve 20, make first opening and second opening butt joint can realize the intercommunication, needn't make rotary sleeve 20 up-and-down motion like this, thereby avoided adopting the steel wire or the spring make the unreliable problem of electronic sliding sleeve of repeatedly opening and closing that leads to of switching, guarantee that electronic sliding sleeve of repeatedly opening and closing can effectively open and close.

It should be noted that the electric sliding sleeve with repeatable opening and closing is a sliding sleeve valve, wherein the repeatable opening and closing means that the outer pipe body 10 and the rotating sleeve 20 can be opened and closed repeatedly, so that the first opening 11 and the second opening 21 can be switched between being communicated and being closed repeatedly.

As shown in fig. 2 and 3, the swivel sleeve 20 has a blocking section 23 and a connecting section 24, the blocking section 23 has a second opening 21, the connecting section 24 has a connecting structure 22, and the diameter of the blocking section 23 is larger than that of the connecting section 24.

Specifically, the plugging section 23 serves as a control part for communication between the inside and the outside of the outer tube body 10, when the second opening hole 21 of the plugging section 23 is in butt joint with the first opening hole 11, the outer tube body 10 and the rotating sleeve 20 are in an open state, when the other part of the plugging section 23 except the second opening hole 21 is in butt joint with the first opening hole 11, the outer tube body 10 and the rotating sleeve 20 are in a closed state, the diameter of the outer ring of the plugging section 23 is generally set to be approximately the same as the diameter of the inner ring of the outer tube body 10, so that the plugging section 23 is in clearance fit with the outer tube body 10, and during manufacturing, it is ensured that the surface between the plugging section 23 and the outer tube body 10 has higher surface precision, so. The connecting section 24 is closer to the well mouth of the mine for the plugging section 23, so the demodulation instrument only needs to be put down to the connecting section 24 with a higher position, meanwhile, the diameter of the connecting section 24 is smaller than that of the plugging section 23, a gap is formed between the connecting section 24 and the outer pipe body 10, the wall thickness of the rotary sleeve 20 is not large generally, the matching space between the adjusting claw of the demodulation instrument and the connecting structure 22 is smaller, the matching space between the adjusting claw and the connecting structure 22 is enlarged by reducing the diameter of the connecting section 24, and the reliability of connection is guaranteed.

In this embodiment, the connecting structure 22 is a plurality of clamping grooves, and each clamping groove is arranged along the circumferential direction of the rotating sleeve 20 at intervals.

Specifically, the joint groove is rectangular shape and extends along the axial of rotating cover 20, the one end in joint groove with the tip intercommunication of rotating cover 20 that is close to the well head, and be provided with six joint grooves along the circumference of rotating cover 20, can just stretch into the joint inslot near the in-process of rotating cover 20 gradually when adjusting the claw butt joint connection structure 22 like this, realize the joint to the degree of difficulty of adjusting the claw with the butt joint of joint groove has been reduced, the operation has been simplified, the reliability of butt joint has been guaranteed.

In an embodiment, not shown, the first opening 11 is a plurality of openings, each first opening 11 is circumferentially spaced along the outer body 10, the second opening 21 is a plurality of openings, each second opening 21 is circumferentially spaced along the rotating sleeve 20.

In this embodiment, there is only one in each of the first opening 11 and the second opening 21, and the square holes are equal in size, and the square holes facilitate calculating whether the first opening 11 and the second opening 21 are completely butted when the rotating sleeve 20 is rotated, that is, when determining that the first opening 11 and the second opening 21 start to be butted by using the measuring and adjusting instrument, the rotating time for completely butting the first opening 11 and the second opening 21 can be calculated according to the size of the square holes and the rotating speed of the rotating sleeve 20. For example, the length of the square hole along the circumferential direction of the rotating sleeve 20 is 40mm, and the rotating speed of the rotating sleeve 20 is 40mm/min, so that the first opening 11 and the second opening 21 can be completely butted by rotating the rotating sleeve 20 for about 1 minute when the first opening 11 and the second opening 21 are butted.

As shown in fig. 1, the electrical sliding sleeve for repeated opening and closing further comprises a first joint 30 and a second joint 40, at least a portion of the first joint 30 is sleeved in the outer tube 10 and abuts against the rotating sleeve 20; at least a portion of the second joint 40 is disposed in the outer tube 10 and abuts against an end of the rotary sleeve 20 away from the first joint 30. That is to say, the rotating sleeve 20 is arranged between the first joint 30 and the second joint 40, and the first joint 30 and the second joint 40 abut against the rotating sleeve 20, so that the rotating sleeve 20 cannot slide but can only rotate, thereby avoiding the problem that the first opening 11 and the second opening 21 are axially dislocated due to the axial sliding of the rotating sleeve 20.

Meanwhile, the repeatable opening and closing electric sliding sleeve further comprises a sealing member 50, and the sealing member 50 is arranged between the first joint 30, the second joint 40, the rotary sleeve 20 and the outer pipe body 10 to ensure the sealing performance between the first joint 30, the second joint 40, the rotary sleeve 20 and the outer pipe body 10. The seal 50 may be an elastic ring such as a rubber ring.

The embodiment also provides a method for replacing the protective liquid in the gas injection pipeline of the mine, wherein the electric sliding sleeve capable of being repeatedly opened and closed is arranged in the mine, and the method comprises the following steps: step S1: the testing and adjusting instrument is put into a mine until a short-distance magnetic positioning peak appears in the testing and adjusting instrument, and the testing and adjusting instrument is positioned in a rotary sleeve 20 of the electric sliding sleeve capable of being repeatedly opened and closed; step S2: opening the adjusting claw of the measuring and adjusting instrument, and adjusting the measuring and adjusting instrument to enable the adjusting claw to extend into the connecting structure 22 of the rotary sleeve 20; step S3: introducing a protective liquid into a gap between the outer pipe body 10 of the electric sliding sleeve capable of being repeatedly opened and closed and the inner wall of the mine or the rotary sleeve 20, and simultaneously controlling the measuring and adjusting instrument to rotate to drive the rotary sleeve 20 to rotate until the second opening 21 of the rotary sleeve 20 is aligned with the first opening 11 of the outer pipe body 10, so that the protective liquid is filled in the gap; step S4: after the protection solution is replaced, the measuring and adjusting instrument is controlled to rotate to drive the rotary sleeve 20 to rotate, so that the second opening 21 and the first opening 11 are staggered, and the rotary sleeve 20 seals the first opening 11.

Specifically, when being provided with foretell electronic sliding sleeve's of repeatable switch mine need change the protective solution, with ground cable car connecting cable, measure and regulate the appearance income well (measure and regulate the appearance and take magnetism positioning system certainly) is connected to the bottom of cable, when measuring and regulating the appearance through revolving cover 20, can appear short distance magnetic positioning peak and two peak distances and equal to revolve the length of cover 20, combines the sleeve pipe to go into the well data, confirms that the short distance magnetic positioning peak that appears this moment shows that measure and regulate the appearance and lie in the top of revolving cover 20.

After the position of the rotary sleeve 20 is determined, the testing and adjusting instrument is lifted to a position 2m above the rotary sleeve 20 through a cable, the adjusting claw of the testing and adjusting instrument is opened under ground control, the cable is slowly placed, and when the adjusting claw is placed to be in contact with the bottom of the clamping groove, a resistance state occurs, and at the moment, the testing and adjusting instrument is in butt joint with the clamping groove. If the resistance state does not occur, the testing and adjusting instrument is lifted up to the position 2m above the rotary sleeve 20 again, and the cable is slowly placed until the resistance state occurs. The position can also be adjusted to 1m to 3m above the swivel nut 20.

In this embodiment, a reverse circulation manner is adopted to introduce the protection liquid into the mine pipeline, specifically, a casing is usually sleeved on the inner wall of the mine, an oil pipe is coaxially arranged in the casing, and an electric sliding sleeve capable of being repeatedly opened and closed is arranged on the oil pipe, so that the electric sliding sleeve capable of being repeatedly opened and closed is arranged in the casing, a gap between the outer pipe 10 and the inner wall of the mine is a gap between the outer pipe 10 and the casing, and because the electric sliding sleeve capable of being repeatedly opened and closed is connected with the oil pipe, the gap is also a gap between the casing and the oil pipe, more specifically, a part of the gap between the casing and the oil pipe, which is sealed by a. The protection liquid is introduced into the gap between the outer tube body 10 and the sleeve, and when the rotary sleeve 20 and the outer tube body 10 are in an open state, the protection liquid flows out from the top outlet of the outer tube body 10 through the inner portion of the outer tube body 10, so that the protection liquid is introduced into the circulation mode flowing out from the inner portion of the outer tube body 10 between the outer tube body 10 and the sleeve, namely reverse circulation.

After the butt joint is finished, the ground controls the rotation of the measuring and adjusting instrument, the measuring and adjusting instrument drives the rotary sleeve 20 to rotate along the axis, and the ground cannot judge whether the space between the outer pipe body 10 and the rotary sleeve 20 is in an opening state or a closing state, so that the protection liquid needs to be replaced by matching with a ground pump truck. Firstly, a pumping pressure of 2MPa is kept between the sleeve and the outer pipe body 10, the ground controls the measuring and regulating instrument to rotate, when the ground pumping pressure is instantly reduced, the measuring and regulating instrument enables the outer pipe body 10 and the rotary sleeve 20 to be in a just opened state, at the moment, the first opening hole 11 is partially communicated with the second opening hole 21, then the measuring and regulating instrument is continuously controlled to rotate according to the time obtained through pre-calculation until the first opening hole 11 is completely butted with the second opening hole 21, and therefore the protection liquid is introduced between the outer pipe body 10 and the sleeve and flows out from the top opening of the outer pipe body 10 through the rotary sleeve 20.

In the present embodiment, the displacement of the ground pump truck is controlled at 15m³And h, until the replacement of the protective solution is completed. While the amount of protective liquid is set to 1.5 times the volume of the gap between the sleeve and the outer body 10. Of course, the above parameters can be adjusted according to actual conditions, and the displacement can be set at 13m³H to 17m³The dosage of the protective solution can be between 1.3 times and 1.8 times of the gap between the first and the second substrates.

When the ground pump truck finishes replacing all the protective liquid, the ground control measuring and adjusting instrument rotates, when the pump pressure of the ground pump truck is suppressed to be higher than the pressure 2MPa to 4MPa when the protective liquid is replaced, the measuring and adjusting instrument enables the outer pipe body 10 and the rotary sleeve 20 to be in a closed state, the measuring and adjusting instrument continues to be controlled to rotate according to the time obtained by pre-calculation until the first opening 11 and the second opening 21 are completely staggered, and the rotary sleeve 20 blocks the first opening 11, so that the electric sliding sleeve which can be repeatedly opened and closed is ensured to be closed. And then directly lifting the cable, driving the testing and adjusting instrument to be directly separated from the clamping groove by the cable, and continuously lifting the testing and adjusting instrument until the testing and adjusting instrument is lifted out of the well, so that the whole process is finished.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

1. the problem of low reliability of the reverse circulation sliding sleeve in the prior art is solved;

2. overall structure is simple, can accurately guarantee repeatedly opening and closing of switch electric sliding sleeve, and the good reliability.

3. The problem that the existing structure needs to be opened and closed unstably by pushing and pulling the sliding sleeve is effectively avoided by arranging the rotary sleeve, and the actual opening and closing state between the outer pipe body and the rotary sleeve is consistent with the expected opening and closing state.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.