CN219220366U - Ball-throwing-free oil sleeve annulus communication device for underground operation - Google Patents
Ball-throwing-free oil sleeve annulus communication device for underground operation Download PDFInfo
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- CN219220366U CN219220366U CN202320321162.XU CN202320321162U CN219220366U CN 219220366 U CN219220366 U CN 219220366U CN 202320321162 U CN202320321162 U CN 202320321162U CN 219220366 U CN219220366 U CN 219220366U
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Abstract
The utility model relates to a ball-free oil sleeve annular communication device for underground operation, which is provided with an inner sliding sleeve, wherein the outer wall of the inner sliding sleeve is provided with a sealing ring and is arranged outside a central tube and connected with an outer sleeve through a fixed shear pin; an inner circulation hole is formed in the pipe body of the central pipe, the upper part of the central pipe is provided with a connector, the lower part of the central pipe is provided with external threads, and the connector is provided with internal threads and external threads; the outer sleeve is connected with the central tube through a connector; the inner sliding sleeve arranged outside the central tube is blocked at the outer circulation hole of the outer sleeve. The device does not need to be provided with a ball seat and a sealing ball, does not need to control the switch of the device through a hydraulic control pipeline or press a circulating channel between a communicating oil pipe and a sleeve through the ball seat and the steel ball, is very suitable for a highly-inclined well, a horizontal well and a production pipe column with more oil dirt and impurities in the well to establish the circulating channel, effectively improves the primary success rate of underground operation construction, and has obvious use effect and application value.
Description
Technical Field
The utility model belongs to a tool for communicating oil sleeve annular space in underground well repairing operation in petroleum industry, in particular to a ball-free oil sleeve annular space communicating device for underground operation.
Background
With the advance of oilfield development technology, the operation workload of offshore and onshore horizontal wells and highly deviated wells is increased year by year, and in the offshore and onshore oil and water well measure operation process, a sliding sleeve is a common tool for communicating an annular space between an oil pipe and a casing and establishing a circulating well flushing channel.
At present, in the underground operation field, the common sliding sleeve comprises: the hydraulic sliding sleeve controlled by the hydraulic pipeline and the pressing sliding sleeve with the pressing ball seat are arranged in the inner cavity. In the construction process of the production site, the use defects of the sliding sleeve with two structures are as follows:
1. the use problem that fluid pressure type sliding sleeve exists:
(1) because of the increase of the horizontal well and the highly-inclined well, the hydraulic sliding sleeve is influenced by the well track in the well descending process, so that eccentric wear is easy to occur, the hydraulic control pipeline is worn and broken, the operation reworking is caused, high underground operation cost loss is caused, the construction period is delayed, and the loss is huge;
(2) the hydraulic pressure is fed into the underground hydraulic sliding sleeve through the hydraulic control pipeline, so that the sliding sleeve is difficult to open, the underground circulating channel cannot be communicated easily; therefore, the hydraulic sliding sleeve can only be used for shallow well sections and is not applicable to deep well sections.
2. Use problem that formula sliding sleeve exists of beating with ball seat:
(1) in the underground operation process of a horizontal well and a highly-inclined well, the pressing type sliding sleeve with the ball seat is easy to have the defect that the sliding sleeve cannot be pressed and opened because a steel ball cannot smoothly enter the ball seat due to the influence of well deviation and well path; (2) the well bore is affected by oil dirt and impurities in the well bore, the steel ball and the ball seat are not tightly sealed or sealed, the sliding sleeve cannot be opened by the pressure of liquid fed by an underground operation pipe column, the operation construction is failed, high underground operation cost loss is caused, the construction period is delayed, and the loss is huge.
In order to solve the above-mentioned problems, the following related patent technologies have appeared: the patent number CN201820745983.5 discloses a sliding sleeve, a rotary stepping sliding sleeve and a fracturing sliding sleeve, relates to the technical field of petroleum exploitation, and solves the problem that the number of fracturing stages adopted by a fracturing mechanism is limited due to the limitation of different sizes of fracturing balls in the step-difference fracturing mechanism.
However, the structure and operation of the device are complex, and the device is not suitable for conventional operation of oil-water wells and production pipe columns.
The utility model discloses a repeatable switching sliding sleeve mechanism for a sleeve sliding sleeve, which solves the problems that the existing sleeve sliding sleeve tool cannot be closed, a well completion pipe column cannot keep the full diameter and the like, and can effectively reduce construction cost of later shaft treatment, horizon blocking and the like of an oil-gas field.
However, the device has larger external dimensions and is not suitable for oil-gas-water well operation and production in the casing.
The sliding sleeve control tool and the hydraulic control sliding sleeve capable of exceeding operation disclosed in the patent number CN201310023553.4 can realize the opening and closing actions of the sliding sleeve by lifting or lowering an oil pipe or a continuous oil pipe; therefore, the defect that the traditional sliding sleeve control tool is easy to operate by mistake can be avoided, the operation efficiency is improved, and the operation is simple and convenient.
The device is simple to operate, but the pipe column is required to be lifted and put in the measure operation process of the oil-water well for multiple times, so that the device is frequently switched on and off, and the underground measure operation is easy to fail; and because the production pipe column cannot be lifted and put after being put into the well, the device cannot be applied to the production pipe column.
Patent number CN201210113663.5 discloses a multi-overflow hole sliding sleeve and horizontal well multistage fracturing sliding sleeve tubular column, belongs to oil gas field exploitation equipment field. The device does not need to reform the existing wellhead and the running pipe column, has great significance for improving the fracturing effect, and has wide application prospect.
However, the device is complex to operate, is suitable for fracturing construction, and is not suitable for being used in conventional operation of an oil-water well and a production string.
Therefore, the utility model needs to provide a ball-free oil sleeve annular communication device, which does not need ball seat and ball-throwing pressing operation, and a sliding sleeve is opened by pressing from a production string, so that an oil pipe is communicated with a sleeve, and a circulation channel is established.
Disclosure of Invention
The utility model aims to provide a ball-free oil sleeve annular communication device for underground operation, which is free of a sealing ball, does not need to control a switch of the device through a hydraulic control pipeline or press a circulating channel between a communication oil pipe and a sleeve through a ball seat and a steel ball, can be used for production pipe columns with large inclination wells, horizontal wells and pipe walls, and is deposited with more oil dirt and impurities, so that the one-time success rate of underground operation construction is improved, the working efficiency is improved, and the well repairing operation cost is reduced.
The purpose of the utility model is realized in the following way: the utility model provides a ball oil jacket annular space intercommunication device is thrown with exempting from to throw in pit operation is equipped with the inner sliding sleeve, wherein: the outer wall of the inner sliding sleeve is provided with a sealing ring and is arranged outside the central tube and connected with the outer sleeve through a fixed shear pin; an inner circulation hole is formed in the pipe body of the central pipe, the upper part of the central pipe is provided with a connector, the lower part of the central pipe is provided with external threads, and the connector is provided with internal threads and external threads; the outer sleeve is connected with the central tube through a connector; the inner sliding sleeve arranged outside the central tube is blocked at the outer circulation hole of the outer sleeve.
Preferably, the outer wall of the central tube is a non-constant diameter outer wall, the outer wall below the connector is gradually reduced, and the inner sliding sleeve is arranged below the outer wall of the tube body provided with the inner circulation hole; when the inner sliding sleeve is arranged outside the central tube, a wall-clamping cavity can be formed between the central tube and the outer sleeve for the inner circulating hole.
Preferably, the number of the internal circulation holes provided in the center pipe is two or more.
Preferably, the inner sliding sleeve is internally provided with shear pin holes the same as the fixed shear pins in number and can be filled with the fixed shear pins; the sealing ring is at least provided with two sealing rings which are uniformly distributed and arranged in the outer wall of the inner sliding sleeve below the shear pin holes, and the sealing ring is just positioned at two sides of the outer circulation hole after the inner sliding sleeve is connected between the central tube and the outer sleeve through the fixed shear pins.
Preferably, a group of shear pin holes in the outer wall of the inner sliding sleeve are arranged above the sealing ring; the number of the group of shear pin holes is set to be more than three, and the aperture of the shear pin holes, the outer diameter of the fixed shear pins and the installation number are determined by the running depth of the ball-free oil sleeve annular communication device connected in the production string.
Preferably, the shear pin holes on the outer wall of the inner sliding sleeve are provided with two groups of shear pin holes and are respectively arranged above and below the sealing rings on two sides of the outer circulation hole, the shear pin holes below the sealing rings are replaced shear pin holes, the number and the positions of the replaced shear pin holes are the same as those of the shear pin holes above the sealing rings, and no fixed shear pin is arranged in the replaced shear pin holes.
Preferably, the upper inner cavity of the outer sleeve is provided with an internal thread and can be connected with an external thread in the connector, the central hole at the lower part of the outer sleeve can penetrate into the central pipe, and the central hole at the lower part of the outer sleeve is in clearance fit with the central pipe.
Preferably, the outer circulation holes in the outer sleeve are set to be more than two.
Preferably, the height of the inner cavity below the outer circulation hole in the outer sleeve is greater than or equal to the height of the inner sliding sleeve.
Preferably, the external thread at the lower part of the central tube and the internal thread in the upper connector are oil tube threads, the internal thread and the external thread in the connector are staggered in the inner cavity and the outer wall of the connector, and the body in which the internal thread is arranged in the connector is higher than the body of the outer sleeve.
Compared with the prior art, the utility model has the following remarkable use effects: the utility model relates to a ball-free oil sleeve annular communication device, wherein a ball seat and a sealing ball are not required, a hydraulic control pipeline is not required to control a switch of the device or a circulation channel between an oil pipe and a sleeve is connected through the ball seat and the ball, the device is very suitable for a highly-inclined well, a horizontal well and a production pipe column with more oil dirt and impurities therein, and the circulation channel can be established by only depending on the pressure difference between the oil pipe and the sleeve, sending liquid from the production pipe column and pressing down and then knocking down an inner sliding sleeve arranged in the liquid.
The device can be used for a production string with more oil dirt and impurities deposited in a highly-inclined well, a horizontal well and a pipe wall, can conveniently establish a circulating channel between an oil pipe and a casing, and effectively improves the primary success rate of underground operation construction.
The utility model has the characteristics of simple structure, easy processing, detachable and replaceable fixed shear pins and repeated use; in order to facilitate disassembly and replacement of the fixed shear pins, two groups of shear pin holes are correspondingly arranged on the outer wall of the inner sliding sleeve and the outer circulation holes in the outer sleeve, so that the inner sliding sleeve can be connected with and installed in the outer sleeve in the positive and negative directions. Meanwhile, the device can be applied to different well depths according to the shearing force required by fixing the shear pins.
In summary, the device has simple structure, no sealing ball is arranged in the device, the construction is convenient, the success rate of one-time construction is high, the use defect of the traditional sliding sleeve device which controls the switch of the device through a hydraulic control pipeline or presses a circulating channel between a communicating oil pipe and a sleeve through a ball seat and a steel ball can be avoided, various adverse consequences caused by the failure of opening the circulating channel are avoided, the construction time is obviously shortened, the underground operation cost is reduced, and the device has obvious use effect and application value.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings: fig. 1 is a schematic structural view of the present utility model.
In the figure: the device comprises a connector 1, an inner circulation hole 2, a fixed shear pin 3, an outer circulation hole 4, an outer sleeve 5, a sealing rubber ring 6, an inner sliding sleeve 7, a central tube 8 and a replacement shear pin hole 9.
Detailed Description
The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present utility model. The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, in the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1, an annular communication device of a ball-free oil jacket for downhole operation is provided with an inner sliding sleeve 7, wherein: the outer wall of the inner sliding sleeve 7 is provided with a sealing ring 6 and is arranged outside the central tube 8 and connected with the outer sleeve 5 through the fixed shear pin 3; an inner circulation hole 2 is arranged in the pipe body of the central pipe 8, the upper part is provided with a connector 1, the lower part is provided with external threads, and the connector 1 is provided with internal threads and external threads; an outer circulation hole 4 is arranged in the pipe body of the outer sleeve 5, and the outer sleeve 5 is connected with the central pipe 8 through a connector 1; an inner sliding sleeve 7 arranged outside the central tube 8 is blocked at the outer circulation hole 4 of the outer sleeve 5.
As the oil sleeve annulus communication device for underground operation, the device is not provided with a sealing ball, the assembled ball-free oil sleeve annulus communication device is used for sealing the outer circulation hole 4 in the outer sleeve 5 through the inner sliding sleeve 7, and the inner sliding sleeve 7 is connected with the outer sleeve 5 through the fixed shear pin 3.
The device is connected in a downhole operation pipe column, and as the bottom end of the downhole operation pipe column is provided with a plug or a single-flow tool, the downhole operation pipe column is used for pressing into a well, and liquid from the downhole operation pipe column returns out of an inner circulation hole 2 in a central pipe 8. Under the action of hydraulic pressure, the fixed shear pin 3 connected between the inner sliding sleeve 7 and the outer sleeve 5 is sheared, then the inner sliding sleeve 7 is hit down, the outer circulation hole 4 is exposed, the communication of the annular space between the oil pipe and the sleeve is realized under the condition that the sealing ball is not arranged, a circulation channel is formed, and the forward flushing and backwashing operation and the oil sleeve annulus communication can be realized and then the production string production is realized.
Because do not establish the sealing ball in this device, circulation channel is compared to the device that realizes oil jacket annular space intercommunication through the sliding sleeve that has set up the sealing ball, does not establish the sealing ball just and does not have the ball seat, and its circulation channel's interior latus rectum is big and avoided setting up the sliding sleeve of sealing ball and all drawbacks that the fluid pressure type sliding sleeve brought, say: the hydraulic sliding sleeve controlled by the hydraulic pipeline is easy to wear and break, so that huge economic loss is lost due to reworking of the construction process; the hydraulic control pipeline has high pressure supplementing difficulty, can only be used for shallow well sections, and is not applicable to deep well sections; the problem that a sliding sleeve cannot be pressed and opened due to the fact that a steel ball cannot smoothly enter a ball seat due to well deviation and well path influence; the steel ball and the ball seat are not tightly sealed due to the influence of impurities in the shaft, so that the process failure caused by the fact that the sliding sleeve cannot be opened under the condition of pressure is avoided.
The utility model has simple structure and convenient use, is not controlled to open and close by the sealing ball, is convenient to construct, can greatly improve the construction efficiency and the success rate of construction, and avoids the huge operation cost caused by the incapability of opening the sealing ball problem and the hydraulic control problem of the traditional sliding sleeve device, thereby obviously reducing the production cost and improving the economic benefit.
On the basis of the first embodiment, the present utility model also has the following embodiments:
one preferred embodiment is: the outer wall of the central tube 8 is a non-constant diameter outer wall, the outer wall below the connector 1 is gradually reduced, and the inner sliding sleeve 7 is arranged below the outer wall of the tube body provided with the inner circulation hole 2; after the inner sliding sleeve 7 is arranged outside the central tube 8, a wall clamping cavity can be formed between the central tube 8 and the outer sleeve 5 for the inner circulating hole 2, the inner sliding sleeve 7 which is conveniently connected below is successfully knocked down, the outer circulating hole 4 is exposed, and the oil sleeve annulus is communicated.
One preferred embodiment is: the number of the inner circulation holes 2 provided in the center pipe 8 is two or more.
One preferred embodiment is: the inner sliding sleeve 7 is provided with shear pin holes the same as the fixed shear pins 3 in number and can be filled with the fixed shear pins 3; the sealing ring 6 is at least provided with two sealing rings which are uniformly distributed and arranged in the outer wall of the inner sliding sleeve 7 below the shear pin holes, and the sealing ring 6 is just positioned at two sides of the outer circulation hole 4 after the inner sliding sleeve 7 is connected between the central tube 8 and the outer sleeve 5 through the fixed shear pin 3.
One preferred embodiment is: the shear pin holes in the outer wall of the inner sliding sleeve 7 are provided with a group and are arranged above the sealing ring 6; the number of the group of shear pin holes is set to be more than three, the aperture of the shear pin holes, the outer diameter of the fixed shear pin 3 and the installation number are determined by the running depth of the ball-free oil sleeve annular communication device connected in the production pipe column, so that the device is applicable to different well depths.
One preferred embodiment is: the shear pin holes on the outer wall of the inner sliding sleeve 7 are provided with two groups of shear pin holes which are respectively arranged above and below the sealing rings 6 on two sides of the outer circulation hole 4, the shear pin holes below the sealing rings 6 are replaced shear pin holes 9, the number and the positions of the replaced shear pin holes 9 are the same as those of the shear pin holes above the sealing rings 6, and the fixed shear pins 3 are not installed in the replaced shear pin holes 9. The shear pin holes 9 are used for facilitating the connection and installation of the inner sliding sleeve 7 in the device, namely, the inner sliding sleeve 7 can be used positively and negatively, and both the positive and the negative can be installed outside the central tube 8.
One preferred embodiment is: the upper inner cavity of the outer sleeve 5 is provided with an internal thread and can be connected with an external thread in the connector 1, the central hole at the lower part of the outer sleeve 5 can penetrate into the central tube 8, and the central hole at the lower part of the outer sleeve 5 is in clearance fit with the central tube 8.
One preferred embodiment is: the outer circulation holes 4 in the outer sleeve 5 are set to be more than two.
One preferred embodiment is: the height of the inner cavity below the outer circulation hole 4 in the outer sleeve 5 is greater than or equal to the height of the inner sliding sleeve 7. When the inner slide sleeve 7 is knocked down into the lower inner cavity of the outer sleeve 5, the outer circulation hole 4 can be completely exposed.
One preferred embodiment is: the external thread at the lower part of the central tube 8 and the internal thread in the upper connector 1 are oil tube threads, the internal thread and the external thread in the connector 1 are staggered in the inner cavity and the outer wall of the connector 1, and the body provided with the internal thread in the connector 1 is higher than the body of the outer sleeve 5. The connector 1 can be used as a tubing coupling, the upper part of the central tube 8 is connected with a tubing in the underground operation tubular column through the connector 1, and the lower part of the central tube 8 can be connected with the tubing coupling in the underground operation tubular column through external threads, so that the device can be conveniently connected to a set position in the underground operation tubular column.
The specific use method of the device is as follows:
the bottom of the underground operation pipe column or the well string is connected with a blind plug or a single-flow tool, and the device is connected with the underground operation pipe column and is lowered to the operation depth in the operation well.
When the reverse circulation well flushing operation is required, liquid is fed from the underground operation tubular column, and the liquid pressure enters a wall-clamping cavity between the central tube 8 and the outer sleeve 5 through the inner circulation hole 2. When the liquid pressure rises to the shearing value set by the fixed shear pin 3, the inner sliding sleeve 7 is pushed to move downwards, the fixed shear pin 3 is sheared off, the inner sliding sleeve 7 moves downwards to the lower inner cavity of the outer sleeve 5, and is limited and contained by the outer sleeve 5. The outer circulation hole 4 is communicated with the inner circulation hole 2 to form a circulation channel, so that the operation of positive and reverse flushing or production of a production pipe column can be performed.
The embodiments described above are only exemplary embodiments, but the present utility model is not limited to these embodiments, and modifications may be made by those skilled in the art without departing from the spirit and scope of the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and concept of the present utility model should be included in the scope of the present utility model. Therefore, the scope of protection is not limited to the description above.
Claims (10)
1. Ball-free oil sleeve annulus communication device for underground operation is provided with an inner sliding sleeve and is characterized in that: the outer wall of the inner sliding sleeve is provided with a sealing ring and is arranged outside the central tube and connected with the outer sleeve through a fixed shear pin; an inner circulation hole is formed in the pipe body of the central pipe, the upper part of the central pipe is provided with a connector, the lower part of the central pipe is provided with external threads, and the connector is provided with internal threads and external threads; the outer sleeve is connected with the central tube through a connector; the inner sliding sleeve arranged outside the central tube is blocked at the outer circulation hole of the outer sleeve.
2. The ball-free oil sleeve annulus communication device for downhole operation according to claim 1, wherein the outer wall of the central tube is a non-constant diameter outer wall, the outer wall below the connector is gradually reduced, and the inner sliding sleeve is arranged below the outer wall of the tube body provided with the inner circulation hole; when the inner sliding sleeve is arranged outside the central tube, a wall-clamping cavity can be formed between the central tube and the outer sleeve for the inner circulating hole.
3. A ball-free oil casing annulus communication device for downhole operation according to claim 1 or 2, wherein the number of the internal circulation holes provided in the central tube is two or more.
4. The ball-free oil sleeve annular communication device for downhole operation according to claim 1 or 2, wherein the inner sliding sleeve is provided with shear pin holes the same as the number of the fixed shear pins and can be filled with the fixed shear pins; the sealing ring is at least provided with two sealing rings which are uniformly distributed and arranged in the outer wall of the inner sliding sleeve below the shear pin holes, and the sealing ring is just positioned at two sides of the outer circulation hole after the inner sliding sleeve is connected between the central tube and the outer sleeve through the fixed shear pins.
5. The ball-free oil sleeve annulus communication device for downhole operation of claim 4, wherein a group of shear pin holes in the outer wall of the inner sleeve are arranged above the sealing ring; the number of the group of shear pin holes is set to be more than three, and the aperture of the shear pin holes, the outer diameter of the fixed shear pins and the installation number are determined by the running depth of the ball-free oil sleeve annular communication device connected in the production string.
6. The ball-free oil sleeve annulus communication device for downhole operation according to claim 5, wherein the shear pin holes on the outer wall of the inner sleeve are provided with two groups of shear pin holes which are respectively arranged above and below the sealing rings on two sides of the outer circulation hole, the shear pin holes below the sealing rings are replaced shear pin holes, the number and the positions of the replaced shear pin holes are the same as those of the shear pin holes above the sealing rings, and no fixed shear pin is arranged in the replaced shear pin holes.
7. The ball-free oil sleeve annulus communication device for downhole operation according to claim 1 or 2, wherein the upper inner cavity of the outer sleeve is provided with an inner thread and can be connected with an outer thread in the connector, the central hole of the lower part of the outer sleeve can penetrate into the central tube, and the central hole of the lower part of the outer sleeve is in clearance fit with the central tube.
8. The ball-free oil casing annulus communication device for downhole operation of claim 7, wherein the outer circulation holes in the outer casing are set to be more than two.
9. The ball-free oil casing annulus communication device for downhole operations of claim 8, wherein the height of the inner cavity below the outer circulation hole in the outer casing is greater than or equal to the height of the inner sliding sleeve.
10. The ball-free oil sleeve annulus communication device for downhole operation according to claim 3, wherein the external thread at the lower part of the central tube and the internal thread in the upper connector are oil pipe threads, the internal thread and the external thread in the connector are arranged in the inner cavity and the outer wall of the connector in a staggered manner, and the body in which the internal thread is arranged in the connector is higher than the body of the outer sleeve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320321162.XU CN219220366U (en) | 2023-02-27 | 2023-02-27 | Ball-throwing-free oil sleeve annulus communication device for underground operation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320321162.XU CN219220366U (en) | 2023-02-27 | 2023-02-27 | Ball-throwing-free oil sleeve annulus communication device for underground operation |
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| CN219220366U true CN219220366U (en) | 2023-06-20 |
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| CN202320321162.XU Active CN219220366U (en) | 2023-02-27 | 2023-02-27 | Ball-throwing-free oil sleeve annulus communication device for underground operation |
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