Downhole butt device

Abstract

The application relates to a downhole butt joint device, which comprises a first cylinder and a second cylinder, the first cylinder is sleeved outside the second cylinder, the first cylinder and the second cylinder are detachably buckled through a buckle structure, a first hydraulic control channel is arranged in the inside of the first cylinder, and a first elastic sealing assembly is movably arranged in the first cylinder, and the first elastic sealing assembly has a sealing position and a communication position. Compared with the prior art, through the arrangement, the butt joint device can realize the effects of synchronous communication and isolation sealing of the second hydraulic control channel while butt joint or separation, the linkage arrangement can facilitate the butt joint installation and removal separation of the operators on the well, and the hydraulic control pipeline can be butt jointed and communicated or disconnected and sealed synchronously during the butt joint or separation.

Description

Technical Field

[0001] This invention relates to the field of petroleum engineering technology, and in particular to a downhole docking device. Background Technology

[0002] The completion string includes the wellbore string and the conventional string. The completion string also connects to a hydraulic control line. Under normal use, the wellbore string and the conventional string are interconnected, and their hydraulic control lines are also interconnected. In the event of a pump inspection or a downhole malfunction, the conventional string needs to be retrieved from the well.

[0003] The existing docking devices can provide a good fixed connection, but when it is necessary to retrieve the ordinary tubing string, the existing downhole docking tools can only dock the tubing string and cannot dock the hydraulic control lines. When the tubing string and the ordinary tubing string are separated, the hydraulic control lines cannot be disconnected simultaneously, which has a practical defect. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a downhole docking device that facilitates docking, installation, and dismantling by surface operators. Furthermore, during docking or dismantling, it can simultaneously connect or disconnect and seal the hydraulic control pipeline.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A downhole docking device includes a first cylinder and a second cylinder, wherein the first cylinder is sleeved on the outside of the second cylinder, and the first cylinder and the second cylinder are detachably fastened together by a snap-fit ​​structure.

[0007] The first cylinder has a first hydraulic control channel inside, and the first cylinder is also movably provided with a first elastic sealing component, which has a sealing position and a communication position.

[0008] The second cylinder has a second hydraulic control channel inside. When the second cylinder moves to be snapped together with the first cylinder, one end of the second hydraulic control channel corresponds to one end of the first hydraulic control channel. The first elastic sealing component is located at the connection between the first hydraulic control channel and the second hydraulic control channel.

[0009] When the second cylinder moves to the point of being snapped together with the first cylinder, the second cylinder, under the action of overcoming the elastic force of the first elastic sealing component, squeezes and pushes the first elastic sealing component into the communication position, and one end of the second hydraulic control channel is connected to one end of the first hydraulic control channel.

[0010] When the second cylinder disengages from the first cylinder, the first elastic sealing component elastically resets and enters the sealing position, sealing the end of the first hydraulic channel.

[0011] In one embodiment, the solution is as follows:

[0012] The inner wall of the first cylinder is provided with a first pair of interfaces, which are connected to the first hydraulic control channel;

[0013] The second cylinder has a second pair of interfaces on its outer wall, and the second pair of interfaces are connected to the second hydraulic control channel;

[0014] The first elastic sealing assembly includes a first sealing sleeve and a first elastic element, one end of the first elastic element being connected to the first sealing sleeve and the other end being connected to the first cylinder body.

[0015] The outer wall of the first sealing sleeve is slidably connected to the inner wall of the first cylinder. The outer wall of the first sealing sleeve is provided with a first annular groove, and the inner wall of the first sealing sleeve is provided with a second annular groove. The interior of the first sealing sleeve is also provided with a connecting hole. The first annular groove communicates with the second annular groove through the connecting hole. When the first sealing sleeve is in the communicating position, the first annular groove corresponds to the first pair of interfaces, and the second annular groove corresponds to the second pair of interfaces.

[0016] In one embodiment, the inner wall of the first cylinder is provided with a first limiting shaft step;

[0017] When the first cylinder body separates from the second cylinder body, the first sealing sleeve slides and presses tightly against the first limiting shaft step under the elastic force of the first elastic element, and the outer wall of the first sealing sleeve seals the first joint.

[0018] In one embodiment, the second cylinder is also movably provided with a second elastic sealing component;

[0019] When the second cylinder body disengages from the first cylinder body, the second elastic sealing component is squeezed into and blocks the second hydraulic control channel under the action of elastic force;

[0020] When the second cylinder moves to the point where it snaps into the first cylinder, the first cylinder squeezes the second elastic sealing assembly away from the second hydraulic channel.

[0021] In one embodiment, the second resilient sealing assembly includes:

[0022] A sealing ball is provided on the outer wall of the second cylinder, and the mounting hole is connected to the second hydraulic control channel.

[0023] A second sealing sleeve is fitted onto the outer wall of the second cylinder and slidably connected to it. The inner wall of the second sealing sleeve has a receiving groove for the movable housing of the sealing ball, and the inner wall of the receiving groove is inclined in an outwardly expanding manner.

[0024] The second elastic element is in a compressed state, with one end connected to the second cylinder and the other end connected to the second sealing sleeve;

[0025] When the second cylinder moves to be snapped into connection with the first cylinder, the first cylinder, under the action of overcoming the elastic force of the second elastic element, pushes the second sealing sleeve to slide to the receiving groove corresponding to the mounting hole. The sealing ball is squeezed into the receiving groove under fluid pressure, and the second hydraulic channel is connected.

[0026] When the second cylinder body disengages from the first cylinder body, the second elastic element elastically resets, pushes the second sealing sleeve to move, and the sealing ball enters and blocks the second hydraulic control channel under the pressure of the inner wall of the receiving groove.

[0027] In one embodiment, a first retaining ring is provided on the outer wall of the second cylinder;

[0028] When the first cylinder separates from the second cylinder, the second sealing sleeve slides and presses tightly against the first snap ring under the elastic force of the second elastic element, and the inner wall of the second sealing sleeve restricts the sealing ball from disengaging from the second hydraulic channel.

[0029] In one embodiment, the snap-fit ​​structure includes:

[0030] A snap-fit ​​hole is formed on the inner wall of the first cylinder; and

[0031] An elastic snap-fit ​​element is disposed on the second cylinder;

[0032] When the second cylinder is inserted into the first cylinder, the first cylinder compresses the elastic snap-fit ​​member and causes it to deform elastically. When the second cylinder is inserted to the snap-fit ​​connection depth, the elastic snap-fit ​​member rebounds and snaps into the snap-fit ​​hole.

[0033] In one embodiment, the latching structure further includes a first latching block and a second latching block;

[0034] The first locking block is protruding and disposed on the inner wall of the first cylinder, and several first locking blocks are evenly distributed along the circumference of the first cylinder.

[0035] The second locking block is protruding and disposed on the outer wall of the second cylinder, and several first locking blocks are evenly distributed along the circumference of the first cylinder;

[0036] There is a clearance distance between adjacent first blocks to allow a single second block to pass through. When the second cylinder is inserted to the snap-fit ​​connection depth and rotated until the elastic snap-fit ​​member snaps into the snap-fit ​​hole, the second block rotates to the back of the first block and comes into contact with the first block.

[0037] In one embodiment, the inner wall of the first cylinder is provided with a second limiting shaft step, and the outer wall of the second cylinder is provided with a second retaining spring, wherein the second limiting shaft step is located in the moving direction of the second retaining spring.

[0038] When the second cylinder is snapped together with the first cylinder, the second limiting shaft step contacts the second retaining spring.

[0039] In one embodiment, a first coil is sleeved on the inner wall of the first cylinder, and the first coil is connected to an output line;

[0040] The outer wall of the second cylinder is fitted with a second coil, and the second coil is connected to an input line;

[0041] When the second cylinder is snapped together with the first cylinder, the first coil is correspondingly sleeved outside the second coil.

[0042] The present invention has the following advantages due to the adoption of the above technical solutions:

[0043] When connecting and installing ordinary pipelines and well-inserted pipelines, the surface operator lowers the ordinary pipeline into the well. During the lowering process, the second cylinder is gradually inserted into the first cylinder until the two cylinders are interlocked. At this point, the second cylinder, overcoming the elastic force of the first elastic sealing component, pushes the first elastic sealing component into the connection position, and one end of the second hydraulic control channel connects with one end of the first hydraulic control channel. Therefore, after the second cylinder and the first cylinder are interlocked, the second hydraulic control channel immediately connects with the first hydraulic control channel. When the second cylinder and the first cylinder disengage, the first elastic sealing component elastically resets and enters the sealing position, sealing the end of the first hydraulic control channel. Through this setting, the docking device can simultaneously achieve the effect of connecting and isolating the second hydraulic control channel while docking or disengaging. This linkage setting facilitates docking, installation, and dismantling for surface operators, and allows for simultaneous docking, connection, and disconnection of the hydraulic control pipeline during docking or dismantling. Attached Figure Description

[0044] Figure 1This is a schematic diagram of the specific structure of the first cylinder in one embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of the specific structure of the second cylinder in one embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of the specific structure of the first elastic sealing component in one embodiment of the present invention;

[0047] Figure 4 This is a schematic diagram of the specific structure of the second hydraulic control channel in one embodiment of the present invention;

[0048] Figure 5 This is a schematic diagram of the specific structure of the second elastic sealing component in one embodiment of the present invention;

[0049] Figure 6 This is a schematic diagram of the specific structure of the first interface and the second interface in one embodiment of the present invention;

[0050] Figure 7 This is a schematic diagram of the specific structure of the first coil in one embodiment of the present invention;

[0051] The markings in the diagram are as follows:

[0052] 1. First cylinder; 11. First hydraulic control channel; 13. First mating interface; 14. First limiting shaft step; 15. Second limiting shaft step; 16. Limiting slot; 17. First coil; 18. Third coil; 19. First non-magnetic sleeve;

[0053] 12. First elastic sealing assembly; 121. First sealing sleeve; 1211. First annular groove; 1212. Second annular groove; 122. First elastic element;

[0054] 2. Second cylinder; 21. Second hydraulic control channel; 22. Second mating interface; 23. Force application shaft step; 25. First snap ring; 26. Second snap ring; 27. Second coil; 28. Fourth coil; 29. ​​Second non-magnetic sleeve;

[0055] 24. Second elastic sealing assembly; 241. Sealing ball; 242. Second sealing sleeve; 243. Second elastic element; 244. Mounting hole; 245. Receiving groove;

[0056] 3. Buckle structure; 31. Snap-fit ​​hole; 32. Elastic snap-fit ​​component; 33. First snap-fit ​​block; 34. Second snap-fit ​​block. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention are described clearly and completely below. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0058] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," "third," "fourth," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0059] Well completion strings include the well-stayed string and the conventional string. Existing docking devices can provide a good fixed connection, but when it is necessary to retrieve the conventional string, existing downhole docking tools can only dock the string itself, not the hydraulic control lines. When the well-stayed string and the conventional string are detached, the hydraulic control lines cannot be disconnected simultaneously, resulting in practical limitations. To address these technical problems, this invention provides a downhole docking device that facilitates docking, installation, and dismantling by surface operators. Furthermore, during docking or dismantling, it can simultaneously connect or disconnect and seal the hydraulic control lines. The specific solution is as follows.

[0060] The technical solution of the present invention will be described in detail below with reference to specific examples.

[0061] Reference Figure 1 , Figure 2 as well as Figure 3 As shown, the downhole docking device involved in the present invention includes a first cylinder 1 and a second cylinder 2. The first cylinder 1 is sleeved on the outside of the second cylinder 2, and the first cylinder 1 and the second cylinder 2 are detachably connected by a snap-fit ​​structure 3.

[0062] The first cylinder 1 has a first hydraulic control channel 11 inside, and a first elastic sealing assembly 12 is also movably disposed thereon. The first elastic sealing assembly 12 has a sealing position and a connecting position. Meanwhile, the second cylinder 2 has a second hydraulic control channel 21 inside. When the second cylinder 2 moves to be snapped into connection with the first cylinder 1, one end of the second hydraulic control channel 21 corresponds to one end of the first hydraulic control channel 11, and the first elastic sealing assembly 12 is located at the connection between the first hydraulic control channel 11 and the second hydraulic control channel 21.

[0063] When the second cylinder 2 moves to the point of engaging with the first cylinder 1, the second cylinder 2, under the action of overcoming the elastic force of the first elastic sealing component 12, pushes the first elastic sealing component 12 into the communication position, and one end of the second hydraulic control channel 21 is connected to one end of the first hydraulic control channel 11. When the second cylinder 2 disengages from the first cylinder 1, the first elastic sealing component 12 elastically resets and enters the sealing position, sealing the end of the first hydraulic control channel 11.

[0064] It should be noted that in this embodiment, the docking device is used as a whole in the installation and docking of the completion tubing string. The first cylinder 1 is used to connect one end of the well-staying pipe, and the second cylinder 2 is used to connect one end of the ordinary pipe. In actual installation, the ordinary pipe is connected to the well-staying pipe through the docking device. The hydraulic control line on the ordinary pipe is also connected to the hydraulic control line on the well-staying tubing string in sequence through the second hydraulic control channel 21 and the first hydraulic control channel 11.

[0065] For example, when connecting and installing a regular pipe and a manhole-insertion pipe, the surface operator lowers the regular pipe into the well. During the lowering process, the second cylinder 2 is gradually inserted into the first cylinder 1 until the second cylinder 2 and the first cylinder 1 are interlocked. At this point, the second cylinder 2, under the action of overcoming the elastic force of the first elastic sealing component 12, pushes the first elastic sealing component 12 into the communication position, and one end of the second hydraulic control channel 21 is correspondingly connected to one end of the first hydraulic control channel 11. Therefore, after the second cylinder 2 and the first cylinder 1 are interlocked, the second hydraulic control channel 21 is immediately connected to the first hydraulic control channel 11. When the second cylinder 2 is disengaged from the first cylinder 1, the first elastic sealing component 12 elastically resets and enters the sealing position, sealing the end of the first hydraulic control channel 11. With this setting, the docking device can simultaneously achieve the effect of connecting and isolating the second hydraulic control channel 21 while docking or disengaging. Such a linkage setting can facilitate docking, installation and dismantling by well operators, and can simultaneously connect or disconnect the hydraulic control pipeline during docking or disengagement.

[0066] In one embodiment, the snap-fit ​​structure 3 is further refined, including a snap-fit ​​hole 31 and an elastic snap-fit ​​member 32. The snap-fit ​​hole 31 is formed on the inner wall of the first cylinder 1, and the elastic snap-fit ​​member 32 is disposed on the second cylinder 2.

[0067] When the second cylinder 2 is inserted into the first cylinder 1, the first cylinder 1 gradually compresses the elastic snap-fit ​​member 32 to deform elastically. When the second cylinder 2 is inserted to the snap-fit ​​connection depth, the elastic snap-fit ​​member 32 rebounds and snaps into the snap-fit ​​hole 31.

[0068] Specifically, the latching structure 3 further includes a first latching block 33 and a second latching block 34. The first latching block 33 protrudes from the inner wall of the first cylinder 1, and several first latching blocks 33 are evenly distributed along the circumference of the first cylinder 1. The second latching block 34 protrudes from the outer wall of the second cylinder 2, and several first latching blocks 33 are evenly distributed along the circumference of the first cylinder 1. It should be noted that in this embodiment, six of each type of latching block are provided.

[0069] It should be noted that in this embodiment, the snap-fit ​​hole 31 is provided with a corresponding elastic snap-fit ​​member 32. Each first snap-fit ​​block 33 is provided with a snap-fit ​​hole 31, so the first cylinder 1 is provided with 6 elastic snap-fit ​​members 32.

[0070] There is a clearance distance between adjacent first locking blocks 33 for a single second locking block 34 to pass through. When the second cylinder 2 is inserted to the locking connection depth and rotated until the elastic locking member 32 is locked with the locking hole 31, the second locking block 34 rotates to the back of the first locking block 33 and the second locking block 34 contacts the first locking block 33.

[0071] For example, when the second cylinder 2 is inserted into the first cylinder 1, the second locking block 34 slides axially along the inner wall of the first cylinder 1. At this time, the second locking block 34 and the first locking block 33 are offset from each other. The second locking block 34 passes through the first locking block 33 through the clearance distance between adjacent first locking blocks 33. When the second cylinder 2 is inserted to the snap-fit ​​connection depth, the second cylinder 2 is rotated through a normal pipe. At this time, the elastic snap-fit ​​member 32 is on the rotation path of the snap-fit ​​hole 31. When the second cylinder 2 rotates to the point where the elastic snap-fit ​​member 32 snaps into the snap-fit ​​hole 31, the second locking block 34 rotates to the back of the first locking block 33 and the second locking block 34 contacts the first locking block 33. At this time, the first locking block 33 restricts the reverse movement of the second locking block 34, thus realizing the snap-fit ​​connection of the snap-fit ​​structure 3. When it is necessary to release the snap-fit ​​connection, the well operator only needs to rotate the second cylinder 2 through the ordinary pipe. After the rotation of the second cylinder 2 deforms the elastic snap-fit ​​32, the snap-fit ​​hole 31 disengages from the elastic snap-fit ​​32. At this time, rotate the second cylinder 2 until the second snap-fit ​​block 34 is offset from the first snap-fit ​​block 33, and then the second cylinder 2 can be taken out.

[0072] Reference Figure 3 , Figure 4 as well as Figure 5 As shown, in one embodiment, the first elastic sealing assembly 12 is further refined, wherein a first pair of interfaces 13 are provided on the inner wall of the first cylinder 1, and the first pair of interfaces 13 are connected to the first hydraulic control channel 11. A second pair of interfaces 22 are provided on the outer wall of the second cylinder 2, and the second pair of interfaces 22 are connected to the second hydraulic control channel 21.

[0073] The first elastic sealing assembly 12 includes a first sealing sleeve 121 and a first elastic element 122. One end of the first elastic element 122 is connected to the first sealing sleeve 121, and the other end is connected to the first cylinder 1. The outer wall of the first sealing sleeve 121 is slidably connected to the inner wall of the first cylinder 1. The outer wall of the first sealing sleeve 121 has a first annular groove 1211, and the inner wall of the first sealing sleeve 121 has a second annular groove 1212. A connecting hole (not shown in the figure) is also provided inside the first sealing sleeve 121, and the first annular groove 1211 communicates with the second annular groove 1212 through the connecting hole. When the first sealing sleeve 121 is in the communicating position, the first annular groove 1211 corresponds to the first mating interface 13, and the second annular groove 1212 corresponds to the second mating interface 22.

[0074] For example, refer to Figure 3 as well as Figure 4 As shown, a force-applying step 23 is provided on the outer wall of the second cylinder 2. When the second cylinder 2 is gradually inserted into the interior of the first cylinder 1, the force-applying step 23 on the outer wall of the second cylinder 2 will gradually approach the first sealing sleeve 121. As insertion continues, the force-applying step 23 will gradually push the first sealing sleeve 121 to move under the action of overcoming the elastic force of the first elastic element 122. When the second cylinder 2 and the first cylinder 1 are snapped together, the first sealing sleeve 121 moves to the communication position. At this time, the first annular groove 1211 corresponds to the first interface 13, and the second annular groove 1212 corresponds to the second interface 22. Therefore, the second hydraulic control channel 21 is connected to the first hydraulic control channel 11.

[0075] When it is necessary to disassemble the ordinary pipeline and the well-stayed pipeline, the operators on the well lift the ordinary pipeline, causing the second cylinder 2 to disengage from the first cylinder 1. At this time, the first sealing sleeve 121 gradually returns to its original position under the elastic force of the first elastic element 122, so the first annular groove 1211 disengages from the first pair of interfaces 13. Under the action of the elastic force, the first sealing sleeve 121 gradually enters the sealing position, and at this time, the inner wall of the first sealing sleeve 121 seals the first pair of interfaces 13. In this way, a synchronous linkage effect is achieved, so when the first cylinder 1 and the second cylinder 2 are disengaged, the first hydraulic control channel 11 of the first cylinder 1 on the well-stayed pipeline can achieve a synchronous sealing effect.

[0076] More preferably, in this embodiment, to improve the sealing stability of the first sealing sleeve 121, a first limiting shaft step 14 is provided on the inner wall of the first cylinder 1. When the first cylinder 1 is separated from the second cylinder 2, the first sealing sleeve 121 slides and presses tightly against the first limiting shaft step 14 under the elastic force of the first elastic member 122, and the outer wall of the first sealing sleeve 121 seals the first mating interface 13. Therefore, the first sealing sleeve 121 can be pressed tightly against the first limiting shaft step 14 under the elastic force of the first elastic member 122.

[0077] Reference Figure 2 as well as Figure 6 As shown, in one embodiment, the second cylinder 2 is also movably provided with a second elastic sealing component 24.

[0078] When the second cylinder 2 is disengaged from the first cylinder 1, the second elastic sealing component 24 is squeezed into and blocks the second hydraulic channel 21 under the action of elastic force.

[0079] When the second cylinder 2 moves to the point where it snaps into the first cylinder 1, the first cylinder 1 squeezes the second elastic sealing assembly 24 to disengage from the second hydraulic control channel 21.

[0080] It should be noted that the second elastic sealing component 24 and the first elastic sealing component 12 have the same linkage sealing and linkage connection effects. In actual use, the docking device can simultaneously achieve the connection and isolation sealing effects of the first hydraulic control channel 11 and the second hydraulic control channel 21 while docking or disengaging. This linkage setting facilitates the docking, installation, and dismantling of ordinary pipelines and well-stayed pipelines by well operators, and can simultaneously connect or disconnect the hydraulic control pipelines during docking or disengagement.

[0081] In this embodiment, the second elastic sealing assembly 24 specifically includes a sealing ball 241, a second sealing sleeve 242, and a second elastic member 243. The outer wall of the second cylinder 2 has a mounting hole 244 for the sealing ball 241 to be inserted, and the mounting hole 244 communicates with the second hydraulic control channel 21. The second sealing sleeve 242 is fitted onto the outer wall of the second cylinder 2 and is slidably connected to the second cylinder 2. The inner wall of the second sealing sleeve 242 has a receiving groove 245 for the sealing ball 241 to be movably received, and the inner wall of the receiving groove 245 is inclined in an outwardly expanding manner. The second elastic member 243 is in a compressed state, with one end connected to the second cylinder 2 and the other end connected to the second sealing sleeve 242.

[0082] It should be noted that, in this embodiment, when the second cylinder 2 moves to be snapped into connection with the first cylinder 1, the first cylinder 1, under the action of overcoming the elastic force of the second elastic element 243, pushes the second sealing sleeve 242 to slide into the receiving groove 245 corresponding to the mounting hole 244. The sealing ball 241 is squeezed into the receiving groove 245 under fluid pressure, and the second hydraulic control channel 21 is connected. When the second cylinder 2 disengages from the first cylinder 1, the second elastic element 243 elastically resets, pushes the second sealing sleeve 242 to move, and the sealing ball 241 enters and blocks the second hydraulic control channel 21 under the pressure of the inner wall of the receiving groove 245, thereby realizing the linkage sealing of the second sealing assembly.

[0083] Specifically, in this embodiment, both the first elastic element 122 and the second elastic element 243 are springs.

[0084] More preferably, in this embodiment, to improve the sealing stability of the second sealing sleeve 242, a first retaining spring 25 is provided on the outer wall of the second cylinder 2. When the first cylinder 1 is separated from the second cylinder 2, the second sealing sleeve 242 slides and presses tightly against the first retaining spring 25 under the elastic force of the second elastic member 243. The inner wall of the second sealing sleeve 242 restricts the sealing ball 241 from disengaging from the second hydraulic control channel 21. Therefore, the second sealing sleeve 242 can be pressed tightly against the first retaining spring 25 under the elastic force of the second elastic member 243.

[0085] In one embodiment, in order to improve the installation and positioning effect of the docking device, two positioning structures are provided on the first cylinder 1 and the second cylinder 2.

[0086] Firstly, a second limiting step 15 is provided on the inner wall of the first cylinder 1, and a second retaining spring 26 is provided on the outer wall of the second cylinder 2. The second limiting step 15 is located in the moving direction of the second retaining spring 26. When the second cylinder 2 is snapped into the first cylinder 1, the second limiting step 15 contacts the second retaining spring 26. Therefore, when the second cylinder 2 is inserted into the first cylinder 1, the second retaining spring 26 will gradually move towards the second limiting step 15. When the second limiting step 15 contacts the second retaining spring 26, the second cylinder 2 reaches the depth for snapping into place, thus achieving the positioning function.

[0087] Secondly, a limiting slot 16 is provided on the inner wall of the first cylinder 1 for the end of the second cylinder 2 to be inserted. Therefore, when the second cylinder 2 is inserted into the first cylinder 1, the end of the second cylinder 2 will gradually move toward the limiting slot 16. When the end of the second cylinder 2 is inserted into the limiting slot 16, the second cylinder 2 reaches the depth of the snap-fit ​​connection, thus achieving the positioning function.

[0088] It should be noted that in current application scenarios, in order to achieve downhole electrical control, electrical control lines and hydraulic control lines are commonly used in some completion strings to monitor and control the downhole producing fluid for a long time. In order to achieve the connection of the completion string, electrical control lines and hydraulic control lines during operation, and to disconnect the ordinary pipeline from the well-stayed pipeline during retrieval, while simultaneously disconnecting the electrical control lines and hydraulic control lines, electronic components are also installed on the first cylinder 1 and the second cylinder 2. The specific scheme is as follows.

[0089] Reference Figure 7 As shown, in an extended embodiment, a first coil 17 is sleeved on the inner wall of the first cylinder 1, and the first coil 17 is connected to an output line. A second coil 27 is sleeved on the outer wall of the second cylinder 2, and the second coil 27 is connected to an input line. When the second cylinder 2 is snapped together with the first cylinder 1, the first coil 17 is correspondingly sleeved outside the second coil 27.

[0090] For example, after docking is completed, the first coil 17 and the second coil 27 are aligned. When the second coil 27 is energized through the input line, the first coil 17 is induced with voltage under the action of electromagnetic induction, thereby realizing wireless transmission of power and signal. At the same time, when the ordinary pipeline and the well-stayed pipeline are disconnected, the disconnection of the second cylinder 2 will cause the second coil 27 to disconnect from the first coil 17, thereby realizing the simultaneous disconnection and separation of the electrical control pipeline and the hydraulic control pipeline, making this docking device highly practical.

[0091] Even better, to enable independent control of the power supply signal and the control signal, in this embodiment, a third coil 18 is also fitted on the inner wall of the first cylinder 1, and the third coil 18 is connected to a control output line. A fourth coil 28 is also fitted on the outer wall of the second cylinder 2, and the fourth coil 28 is connected to a control input line. When the second cylinder 2 and the first cylinder 1 are snapped together, the third coil 18 is fitted outside the fourth coil 28. In addition, in this embodiment, to avoid interference between the control signal and the power supply signal, a first non-magnetic sleeve 19 is provided between the first coil 17 and the third coil 18 on the first cylinder 1; and a second non-magnetic sleeve 29 is provided between the second coil 27 and the fourth coil 28 on the second cylinder 2.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A downhole docking device, characterized by, It includes a first cylinder and a second cylinder, the first cylinder being sleeved on the outside of the second cylinder, and the first cylinder and the second cylinder being detachably connected by a snap-fit ​​structure; The first cylinder has a first hydraulic control channel inside, and a first elastic sealing component is also movably disposed in the first cylinder. The first elastic sealing component has a sealing position and a communication position. A first pair of interfaces is provided on the inner wall of the first cylinder, and the first pair of interfaces communicates with the first hydraulic control channel. The second cylinder has a second hydraulic control channel inside. When the second cylinder moves to be snapped together with the first cylinder, one end of the second hydraulic control channel corresponds to one end of the first hydraulic control channel. The first elastic sealing component is located at the connection between the first hydraulic control channel and the second hydraulic control channel. The second cylinder has a second pair of interfaces on its outer wall, and the second pair of interfaces are connected to the second hydraulic control channel; When the second cylinder moves to the point of being snapped together with the first cylinder, the second cylinder, under the action of overcoming the elastic force of the first elastic sealing component, squeezes and pushes the first elastic sealing component into the communication position, and one end of the second hydraulic control channel is connected to one end of the first hydraulic control channel. When the second cylinder body disengages from the first cylinder body, the first elastic sealing component elastically resets and enters the sealing position, sealing the end of the first hydraulic channel. The first elastic sealing assembly includes a first sealing sleeve and a first elastic element, one end of the first elastic element being connected to the first sealing sleeve and the other end being connected to the first cylinder body. The outer wall of the first sealing sleeve is slidably connected to the inner wall of the first cylinder. The outer wall of the first sealing sleeve is provided with a first annular groove, and the inner wall of the first sealing sleeve is provided with a second annular groove. A connecting hole is also provided inside the first sealing sleeve. The first annular groove communicates with the second annular groove through the connecting hole. When the first sealing sleeve is in the communicating position, the first annular groove corresponds to the first mating interface, and the second annular groove corresponds to the second mating interface. The snap-fit ​​structure includes: A snap-fit ​​hole is formed on the inner wall of the first cylinder; and An elastic snap-fit ​​element is disposed on the second cylinder; When the second cylinder is inserted into the first cylinder, the first cylinder compresses the elastic snap-fit ​​member and causes it to deform elastically. When the second cylinder is inserted to the snap-fit ​​connection depth, the elastic snap-fit ​​member rebounds and snaps into the snap-fit ​​hole.

2. The downhole mating device of claim 1, wherein, The inner wall of the first cylinder is provided with a first limiting shaft step; When the first cylinder body separates from the second cylinder body, the first sealing sleeve slides and presses tightly against the first limiting shaft step under the elastic force of the first elastic element, and the outer wall of the first sealing sleeve seals the first joint.

3. The downhole docking device according to claim 1, characterized in that, The second cylinder is also movably provided with a second elastic sealing assembly; When the second cylinder body disengages from the first cylinder body, the second elastic sealing component is squeezed into and blocks the second hydraulic control channel under the action of elastic force; When the second cylinder moves to the point where it snaps into the first cylinder, the first cylinder squeezes the second elastic sealing assembly away from the second hydraulic channel.

4. The downhole mating device of claim 3, wherein, The second resilient sealing assembly includes: A sealing ball is provided on the outer wall of the second cylinder, and the mounting hole is connected to the second hydraulic control channel. A second sealing sleeve is fitted onto the outer wall of the second cylinder and slidably connected to it. The inner wall of the second sealing sleeve has a receiving groove for the movable housing of the sealing ball, and the inner wall of the receiving groove is inclined in an outwardly expanding manner. The second elastic element is in a compressed state, with one end connected to the second cylinder and the other end connected to the second sealing sleeve; When the second cylinder moves to be snapped into connection with the first cylinder, the first cylinder, under the action of overcoming the elastic force of the second elastic element, pushes the second sealing sleeve to slide to the receiving groove corresponding to the mounting hole. The sealing ball is squeezed into the receiving groove under fluid pressure, and the second hydraulic channel is connected. When the second cylinder body disengages from the first cylinder body, the second elastic element elastically resets, pushes the second sealing sleeve to move, and the sealing ball enters and blocks the second hydraulic control channel under the pressure of the inner wall of the receiving groove.

5. The downhole mating device of claim 4, wherein, A first retaining ring is provided on the outer wall of the second cylinder; When the first cylinder separates from the second cylinder, the second sealing sleeve slides and presses tightly against the first snap ring under the elastic force of the second elastic element, and the inner wall of the second sealing sleeve restricts the sealing ball from disengaging from the second hydraulic channel.

6. The downhole mating device of claim 1, wherein, The buckle structure also includes a first locking block and a second locking block; The first locking block is protruding and disposed on the inner wall of the first cylinder, and several first locking blocks are evenly distributed along the circumference of the first cylinder. The second locking block is protruding and disposed on the outer wall of the second cylinder, and several first locking blocks are evenly distributed along the circumference of the first cylinder; There is a clearance distance between adjacent first blocks to allow a single second block to pass through. When the second cylinder is inserted to the snap-fit ​​connection depth and rotated until the elastic snap-fit ​​member snaps into the snap-fit ​​hole, the second block rotates to the back of the first block and comes into contact with the first block.

7. The downhole mating device of claim 1, wherein, The inner wall of the first cylinder is provided with a second limiting shaft step, and the outer wall of the second cylinder is provided with a second retaining spring. The second limiting shaft step is located in the moving direction of the second retaining spring. When the second cylinder is snapped together with the first cylinder, the second limiting shaft step contacts the second retaining spring.

8. The downhole mating device of claim 1, wherein, The inner wall of the first cylinder is fitted with a first coil, and the first coil is connected to an output line. The outer wall of the second cylinder is fitted with a second coil, and the second coil is connected to an input line; When the second cylinder is snapped together with the first cylinder, the first coil is correspondingly sleeved outside the second coil.

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