A docking device for underground safety valve control pipeline

Abstract

The invention discloses a docking device for a downhole safety valve control pipeline, comprising a main body, a sealing sleeve, a clamping ring, a sealing ring, a limiting sleeve, a first limiting shearing nail and a second limiting shearing nail, wherein the sealing sleeve is installed at the lower part of the main body; the first limiting shearing nail fixes the sealing sleeve to the main body; a clamping ring groove and a sealing ring groove are arranged on the outer wall of the main body above the sealing sleeve, the sealing ring groove is arranged between the clamping ring groove and the sealing sleeve, and a clamping ring and a sealing ring are respectively installed in the clamping ring groove and the sealing ring groove; the limiting sleeve is sleeved onto the lower end of the main body, and the second limiting shearing nail fixes the limiting sleeve to the main body; a docking hole connected to a hydraulic cavity is arranged inside the downhole safety valve, and the docking device is sealed and installed in the docking hole from the bottom of the docking hole, the clamping ring groove is located above the docking hole, the limiting sleeve is located below the docking hole, the outer diameter of the limiting sleeve is larger than the inner diameter of the docking hole, and the sealing ring and the sealing sleeve are both fitted with the hole wall of the docking hole. The operation of preventing blowout and lifting the pipe string is conveniently carried out, and the lifting speed of the pipe is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas production tools in oil fields, in particular to a docking device for a downhole safety valve control pipeline. Background Art

[0002] Downhole safety valve is installed in oil and gas wells. In the event of fire, pipeline rupture, or irresistible natural disasters (such as earthquakes, ice conditions, strong typhoons, etc.), it can close the downhole production channel in time to prevent oil and gas leakage from causing environmental pollution and other safety accidents. The control pipeline of the downhole safety valve is connected to its hydraulic chamber through a docking device, and hydraulic oil is added to the hydraulic chamber from the ground. Figure 1 As shown, high-pressure liquid enters the hydraulic chamber e through the control pipeline a, pushing the piston b downward, compressing the spring c, and the piston b pushes the valve plate d to open the downhole safety valve; maintaining the ground control pressure, the downhole safety valve remains in the open state; releasing the ground control pressure, the valve plate d is reset under the action of the torsion spring at its rotating shaft, and the downhole safety valve is closed.

[0003] like Figure 1 As shown, currently the downhole safety valve control pipeline a is connected to the outside of the oil pipe and to the outer pipe wall of the downhole safety valve. During the high-pressure well repair process, the control pipeline is also clamped on the outer wall of the oil pipe by the pipeline clamp. During the high-pressure oil, gas and water well repair process, the installation position of the control pipeline a will bring huge workload and construction risks to the pipe string for blowout prevention operations. Summary of the invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a docking device for a downhole safety valve control pipeline, through which the control pipeline and the downhole safety valve can be docked, which can well solve the technical problem of lifting the pipe string in blowout prevention operations.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A docking device for a downhole safety valve control pipeline comprises a main body, a sealing sleeve, a clamping ring, a sealing ring, a limiting sleeve, a first limiting shearing nail and a second limiting shearing nail, wherein the sealing sleeve is installed on the lower part of the main body; the sealing sleeve is provided with a radial first positioning hole, and the first limiting shearing nail passes through the first positioning hole to fix the sealing sleeve to the main body; a clamping ring groove and a sealing ring groove are provided on the outer wall of the main body above the sealing sleeve, and the sealing ring groove is provided between the clamping ring groove and the sealing sleeve, and a clamping ring and a sealing ring are respectively installed in the clamping ring groove and the sealing ring groove; the limiting sleeve is sleeved on the lower end of the main body, the limiting sleeve is provided with a radial second positioning hole, and the second limiting shearing nail passes through the second positioning hole to fix the limiting sleeve to the main body;

[0007] A docking hole connected to the hydraulic chamber is arranged inside the downhole safety valve, the docking device is sealed and installed in the docking hole from the bottom of the docking hole, the retaining ring groove is located above the docking hole, the limit sleeve is located below the docking hole, the outer diameter of the limit sleeve is larger than the inner diameter of the docking hole, and the sealing ring and the sealing sleeve are both in contact with the hole wall of the docking hole.

[0008] Furthermore, the docking hole includes a first hole section located at the top and a second hole section located at the bottom, the inner diameter of the first hole section is smaller than the inner diameter of the second hole section, and the second hole section is connected to a channel connected to the hydraulic chamber; the sealing ring cooperates with the first hole section, and the sealing sleeve cooperates with the second hole section; a sliding sleeve is also installed in the second hole section, and the outer wall of the sliding sleeve is fitted with the inner wall of the second hole section, and shear pins for limiting the sliding sleeve are also installed in the second hole section, so that the sliding sleeve closes the channel.

[0009] Furthermore, first sealing grooves are provided on both upper and lower sides of the inner wall of the second hole section connected to the channel. The first sealing groove is located at the matching position between the second hole section and the sliding sleeve, and a first sealing ring is installed in the first sealing groove.

[0010] Furthermore, an axial channel and a radial channel communicating with the axial channel are provided in the main body, the axial channel passes through the upper end surface of the main body, and the radial channel radially passes through the main body; the inner wall of the lower part of the sealing sleeve is in contact with the outer wall of the main body, and there is a gap between the upper part of the sealing sleeve and the outer wall of the main body, and a radial guide hole is also provided on the upper part of the sealing sleeve; when the docking device is sealed and installed in the docking hole, the radial channel is located on the upper part of the sealing sleeve, and the guide hole corresponds to the channel.

[0011] Furthermore, a thread connected to a control pipeline joint is provided at the upper end of the axial channel.

[0012] Furthermore, a second sealing groove is provided on the inner wall and the outer wall of the lower part of the sealing sleeve, and a second sealing ring is installed in the second sealing groove.

[0013] Furthermore, the shear force of the first position-limiting shear nail is smaller than the shear force of the second position-limiting shear nail.

[0014] The docking device of the control pipeline of the downhole safety valve in the present invention seals the docking hole connected to the hydraulic chamber through the docking device. When the downhole safety valve needs to be opened, a channel connected to the hydraulic chamber can be used to supply hydraulic oil to the hydraulic chamber, and the downhole safety valve is opened; when a safety accident occurs, the docking device needs to be disengaged from the docking hole, and the control pipeline is pulled from above. After breaking the second limit shear nail, the main body is disengaged from the docking hole to achieve pressure relief of the hydraulic chamber, so that the downhole safety valve can be automatically closed. The docking device is installed inside the downhole safety valve, and accordingly, the control pipeline connected to the docking device is arranged inside the pipe string. There is no need to install a clip for fixing the control pipeline on the outer wall of the pipe string. When the well is inspected and repaired, the docking device is removed from the safety valve through the control pipeline, so that the blowout prevention pipe string operation can be carried out very conveniently, and the pipe lifting speed of the blowout prevention operation can be greatly improved, avoiding safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the connection between the hydraulic control pipeline and the downhole safety valve in the background technology;

[0016] Figure 2 This is a schematic diagram of the connection and installation between the connection device of the downhole safety valve control pipeline and the downhole safety valve in Example 1 of the present invention;

[0017] Figure 3 A schematic diagram of the structure of a docking device for a downhole safety valve control pipeline provided in Example 1 of the present invention;

[0018] Figure 4 This is a schematic structural diagram of the sealing state of a portion of a docking device and a downhole safety valve in Example 1 of the present invention;

[0019] Figure 5 for Figure 4 Schematic diagram of hydraulic oil flow in the state;

[0020] Figure 6 This is a schematic diagram of the connection device and the downhole safety valve after being disconnected in Example 1 of the present invention;

[0021] Figure 7 This is a schematic diagram of the connection and installation between the connection device of the downhole safety valve control pipeline and the downhole safety valve in Example 2 of the present invention;

[0022] Figure 8 A schematic diagram of the structure of a docking device for a downhole safety valve control pipeline provided in Example 2 of the present invention;

[0023] Fig. 9 It is a structural schematic diagram of the sealing state of a part of a docking device and a downhole safety valve in Embodiment 2 of the present invention;

[0024] Fig.10This is a schematic diagram of the connection device and the downhole safety valve after being disconnected in Embodiment 2 of the present invention;

[0025] In the figure:

[0026] 1. Docking device; 11. Main body; 111. Axial channel; 112. Radial channel; 12. Snap ring; 13. Sealing ring; 14. Sealing sleeve; 141. Diversion hole; 142. Second sealing ring; 15. First limit shear pin; 16. Limit sleeve; 17. Second limit shear pin; 18. Thread; 2. Downhole safety valve; 21. Docking hole; 211. First hole section; 212. Second hole section; 22. Sliding sleeve; 23. Shear pin; 24. Channel; 25. First sealing ring; 3. Hydraulic chamber; 4. Control pipeline joint. DETAILED DESCRIPTION

[0027] In order to clearly illustrate the design concept of the present invention, the present invention is described below in conjunction with examples.

[0028] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the drawings in the examples of the present invention. Obviously, the described examples are only part of the examples of the present invention, not all of the examples. Based on the examples in the present invention, all other implementation methods obtained by ordinary technicians in the field without making creative work should fall within the scope of protection of the present invention.

[0029] In the description of the present embodiment, the terms "upper", "lower", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish similar objects, and cannot be understood as a specific order or sequence, and it should be understood that such usage can be interchangeable under appropriate circumstances.

[0030] The present invention provides a docking device for a downhole safety valve control pipeline, comprising a main body, a sealing sleeve, a clamping ring, a sealing ring, a limiting sleeve, a first limiting shearing nail and a second limiting shearing nail, wherein the sealing sleeve is installed on the lower part of the main body; the sealing sleeve is provided with a radial first positioning hole, and the first limiting shearing nail passes through the first positioning hole to fix the sealing sleeve to the main body; a clamping ring groove and a sealing ring groove are provided on the outer wall of the main body above the sealing sleeve, and the sealing ring groove is provided between the clamping ring groove and the sealing sleeve, and a clamping ring and a sealing ring are respectively installed in the clamping ring groove and the sealing ring groove; the limiting sleeve is sleeved on the lower end of the main body, the limiting sleeve is provided with a radial second positioning hole, and the second limiting shearing nail passes through the second positioning hole to fix the limiting sleeve to the main body;

[0031] A docking hole connected to the hydraulic chamber is arranged inside the downhole safety valve, and the docking device is sealed and installed into the docking hole from the bottom of the docking hole, the retaining ring groove is located above the docking hole, the limit sleeve is located below the docking hole, the outer diameter of the limit sleeve is larger than the inner diameter of the docking hole, and the sealing ring and the sealing sleeve are both in contact with the hole wall of the docking hole.

[0032] The docking device of the control pipeline of the downhole safety valve in the present invention seals the docking hole connected to the hydraulic chamber through the docking device. When the downhole safety valve needs to be opened, a channel connected to the hydraulic chamber can be used to supply hydraulic oil to the hydraulic chamber, and the downhole safety valve is opened; when a safety accident occurs, the docking device needs to be disengaged from the docking hole, and the control pipeline is pulled from above. After breaking the second limit shear nail, the main body is disengaged from the docking hole to achieve pressure relief of the hydraulic chamber, so that the downhole safety valve can be automatically closed. The docking device is installed inside the downhole safety valve, and accordingly, the control pipeline connected to the docking device is arranged inside the pipe string. There is no need to install a clip for fixing the control pipeline on the outer wall of the pipe string. When the well is inspected and repaired, the docking device is removed from the safety valve through the control pipeline, so that the blowout prevention pipe string operation can be carried out very conveniently, and the pipe lifting speed of the blowout prevention operation can be greatly improved, avoiding safety hazards.

[0033] In order to more clearly explain the technical solution in the present invention, the present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. In the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0034] Example 1

[0035] like Figure 2-6 As shown, a first embodiment of a docking device for a downhole safety valve control pipeline of the present invention is provided, the docking device 1 comprises a main body 11, a sealing sleeve 14, a clamping ring 12, a sealing ring 13, a limiting sleeve 16, a first limiting shearing nail 15 and a second limiting shearing nail 17, the sealing sleeve 14 is installed on the lower part of the main body 11; the sealing sleeve is provided with a radial first positioning hole, and the first limiting shearing nail 15 passes through the first positioning hole to fix the sealing sleeve 14 to the main body 11; a clamping ring groove and a sealing ring groove are provided on the outer wall of the main body 11 above the sealing sleeve 14, the sealing ring groove is provided between the clamping ring groove and the sealing sleeve 14, and the clamping ring 12 and the sealing ring 13 are respectively installed in the clamping ring groove and the sealing ring groove; the limiting sleeve 16 is sleeved on the lower end of the main body 11, the limiting sleeve 16 is provided with a radial second positioning hole, and the second limiting shearing nail 17 passes through the second positioning hole to fix the limiting sleeve 16 to the main body 11;

[0036] A docking hole 21 connected to the hydraulic chamber 3 is arranged inside the downhole safety valve 2. The docking device 1 is sealed and installed in the docking hole from the bottom of the docking hole 21. The retaining ring groove is located above the docking hole 21. The limit sleeve 16 is located below the docking hole 21. The outer diameter of the limit sleeve 16 is larger than the inner diameter of the docking hole 21. The sealing ring 13 and the sealing sleeve 14 are both in contact with the hole wall of the docking hole 21. Specifically, the docking hole 21 includes a first hole section 211 located at the upper part and a second hole section 212 located at the lower part. The inner diameter of the first hole section 211 is smaller than the inner diameter of the second hole section 212. The second hole section 212 is connected to the channel 24 connected to the hydraulic chamber 3. The sealing ring 13 cooperates with the first hole section 211, and the sealing sleeve 14 cooperates with the second hole section 212. The second hole section 212 is also equipped with a sleeve 22, and the outer wall of the sleeve 22 is in contact with the inner wall of the second hole section 212. The second hole section 212 is also equipped with a shear nail 23 for limiting the position of the sleeve 22, so that the sleeve 22 closes the channel 24. The upper and lower sides of the inner wall of the second hole section 212 connected to the channel 24 are both provided with a first sealing groove, and the first sealing groove is located at the cooperation position between the second hole section 212 and the sleeve 22. The first sealing ring 25 is installed in the first sealing groove. When the docking device 1 is not docked with the downhole safety valve 2, the sealing of the sleeve 22 to the channel 24 can also be ensured.

[0037] In particular, an axial channel 111 and a radial channel 112 communicating with the axial channel 111 are provided in the main body 11; the axial channel 111 passes through the upper end surface of the main body 11, and the radial channel 112 radially passes through the main body 11; the inner wall of the lower portion of the sealing sleeve 14 fits with the outer wall of the main body 11, and there is a gap between the upper portion of the sealing sleeve 14 and the outer wall of the main body 11; a radial guide hole 141 is also provided on the upper portion of the sealing sleeve 14; when the docking device 1 is sealed and installed in the docking hole 21, the radial channel 112 is located on the upper portion of the sealing sleeve 14, and the guide hole 141 corresponds to the channel 24. A thread 18 connected to the control pipeline joint 4 is provided on the upper end of the axial channel 111. At this time, hydraulic oil can be input into the hydraulic chamber through the control pipeline, Figure 5 The arrow direction in the figure is the flow direction of the hydraulic oil when the downhole safety valve 2 is to be opened. The hydraulic oil enters the radial channel 112 through the axial channel 111 and then enters the guide hole 141 and the channel 24 corresponding to the guide hole 141 through the gap between the main body 11 and the sealing sleeve 14, and then enters the hydraulic cavity to open the downhole safety valve 2. When an accident occurs and the downhole safety valve 2 needs to be closed, the ground control stops supplying fluid to the hydraulic cavity 3, and then the control pipeline is pulled up to break the second limit shear nail 17, and the main body 11 is pulled out of the docking hole 21. Figure 6As shown, the hydraulic chamber 3 is depressurized and the downhole safety valve is automatically closed. The downhole safety valve control pipeline docking device can achieve three functions: 1. Achieve sealed docking with the inside of the downhole safety valve 2; 2. When the docking device 1 is sealed and installed in the docking hole 21, it can be connected with the hydraulic chamber 3, and hydraulic oil is input through the control pipeline to open the downhole safety valve 2; 3. By pulling the main body 11 out of the docking hole 21, the hydraulic chamber 3 is depressurized to achieve the closure of the downhole safety valve 2.

[0038] In this embodiment, the inner wall and the outer wall of the lower part of the sealing sleeve 14 are both provided with a second sealing groove, and the second sealing ring 142 is installed in the second sealing groove to ensure the sealing of the sealing sleeve 14 with the main body 11 and the second hole section 212.

[0039] In this embodiment, the shear force of the first limit shear nail 15 is smaller than the shear force of the second limit shear nail 17, so as to prevent the second limit shear nail 17 from being broken when the docking device 1 and the downhole safety valve 2 are sealed and docked.

[0040] like Figure 2 , 4 6, which reflects the docking and use process of the docking device 1 and the downhole safety valve 2 in this embodiment:

[0041] Downhole safety valve into the well process: Figure 2 As shown, after the control pipeline is connected to the docking device 1 through the control pipeline joint 4, it is suspended in the downhole safety valve 2 and passes through the docking hole 21. The downhole safety valve 2 is sealed by the sliding sleeve 22. At this time, the clamping ring 12 and the sealing ring 13 are respectively inserted into the clamping ring groove and the sealing ring groove provided on the main body 11;

[0042] The docking device 1 and the downhole safety valve 2 are connected and the process of opening the downhole safety valve 2 is as follows: After the oil pipe string is lowered, the control pipeline is fished out by using a fishing tool through a steel wire operation or other operation and a certain pulling force is applied to make the docking device 1 connected to the lower end of the control pipeline dock with the docking hole 21 of the downhole safety valve 2. Figure 4 As shown, during the docking process, the sleeve 22 moves upward, the docking device 1 seals the channel 24, and then the main body 11 is lifted up through the control pipeline, and the docking device 1 is fixed through the first limit shear nail 15. At this time, the clamping ring 12 is disengaged from the clamping ring groove, the wellhead downhole control pipeline control system is connected and the wellhead is installed and put into production, and hydraulic oil is input into the hydraulic chamber 3 through the control pipeline through the axial channel 111 and the radial channel 112, and the downhole safety valve 2 is opened;

[0043] The process of closing the downhole safety valve and lifting the pipe string: dismantle the wellhead, increase the force to lift the control pipeline, so that the second limit shear nail 17 fixed on the docking device 1 is pulled off, the limit sleeve 16 falls off from the main body 11, the main body 11 escapes from the docking hole 21, and the hydraulic oil flows out from the channel 24 to the inside of the downhole safety valve 2, completing the pressure relief of the hydraulic chamber 3, and the downhole safety valve 2 closes automatically. In this way, since there is no influence of the fixed control pipeline clip, it is very convenient and quick to lift the downhole pipe string and supporting tools in the blowout prevention operation, which greatly reduces the construction difficulty and safety risks and improves work efficiency.

[0044] Example 2

[0045] like Figure 7-10 As shown, this embodiment is an improvement on the docking device 1 based on the embodiment 1, and accordingly, the structure of the downhole safety valve 2 is also adaptively improved. The improvement lies in that the channel for inputting hydraulic oil to the hydraulic chamber 3 is arranged on the end face of the downhole safety valve 2, and a plug for the input hydraulic oil channel is arranged at the end face. At this time, the docking device only provides the functions of sealing docking and relieving pressure on the hydraulic chamber.

[0046] like Figure 7 , 9 10, which reflects the docking and use process of the docking device 1 and the downhole safety valve 2 in this embodiment:

[0047] Downhole safety valve into the well process: Figure 7 As shown, after the control pipeline is connected to the docking device 1 through the control pipeline joint 4, it is suspended in the downhole safety valve 2 and passes through the docking hole 21. The downhole safety valve 2 is sealed by the sliding sleeve 22. At this time, the clamping ring 12 and the sealing ring 13 are respectively inserted into the clamping ring groove and the sealing ring groove provided on the main body 11;

[0048] The docking device 1 and the downhole safety valve 2 are connected and the process of opening the downhole safety valve 2 is as follows: After the oil pipe string is lowered, the control pipeline is fished out by using a fishing tool through a steel wire operation or other operation and a certain pulling force is applied to make the docking device 1 connected to the lower end of the control pipeline dock with the docking hole 21 of the downhole safety valve 2. Fig. 9 As shown, during the docking process, the sleeve 22 moves upward, the docking device 1 seals the channel 24, and then the main body 11 is lifted up through the control pipeline, and the docking device 1 is fixed through the first limit shear nail 15. At this time, the clamping ring 12 is disengaged from the clamping ring groove, the wellhead and downhole control pipeline control system are connected and the wellhead is installed and put into production, the plug on the hydraulic oil delivery channel in the downhole safety valve 2 is opened, hydraulic oil is input into the hydraulic chamber 3, and the downhole safety valve 2 is opened. After the downhole safety valve 2 is opened, the channel for delivering hydraulic oil is closed again by the plug;

[0049] The process of closing the downhole safety valve and lifting the pipe string: dismantle the wellhead, increase the force to lift the control pipeline, so that the second limit shear nail 17 fixed on the docking device 1 is pulled off, the limit sleeve 16 falls off from the main body 11, the main body 11 escapes from the docking hole 21, and the hydraulic oil flows out from the channel 24 to the inside of the downhole safety valve 2, completing the pressure relief of the hydraulic chamber 3, and the downhole safety valve closes automatically. In this way, since there is no influence of the fixed control pipeline clip, it is very convenient and quick to lift the downhole pipe string and supporting tools in the blowout prevention operation, which greatly reduces the construction difficulty and safety risks and improves work efficiency.

[0050] In the above process, the docking device 1 can achieve sealing with the downhole safety valve 2 to ensure the opening of the downhole safety valve, and can also relieve pressure in the hydraulic chamber 3 to achieve the closing of the downhole safety valve 2.

[0051] It should be noted that the “upper” and “lower” mentioned in the above implementation refer to the relative directions of the docking device 1 and the downhole safety valve 2 when in use.

[0052] Finally, it is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the principles and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A docking device for a downhole safety valve control pipeline, characterized in that: It comprises a main body, a sealing sleeve, a snap ring, a sealing ring, a limiting sleeve, a first limiting shear nail and a second limiting shear nail, wherein the sealing sleeve is installed on the lower part of the main body; the sealing sleeve is provided with a radial first positioning hole, and the first limiting shear nail passes through the first positioning hole to fix the sealing sleeve to the main body; a snap ring groove and a sealing ring groove are provided on the outer wall of the main body above the sealing sleeve, and the sealing ring groove is provided between the snap ring groove and the sealing sleeve, and a snap ring and a sealing ring are respectively installed in the snap ring groove and the sealing ring groove; the limiting sleeve is sleeved on the lower end of the main body, the limiting sleeve is provided with a radial second positioning hole, and the second limiting shear nail passes through the second positioning hole to fix the limiting sleeve to the main body; A docking hole connected to the hydraulic chamber is arranged inside the downhole safety valve, the docking device is sealed and installed in the docking hole from the bottom of the docking hole, the retaining ring groove is located above the docking hole, the limit sleeve is located below the docking hole, the outer diameter of the limit sleeve is larger than the inner diameter of the docking hole, and the sealing ring and the sealing sleeve are both in contact with the hole wall of the docking hole.

2. The docking device according to claim 1, characterized in that: The docking hole includes a first hole section located at the upper part and a second hole section located at the lower part, the inner diameter of the first hole section is smaller than the inner diameter of the second hole section, and the second hole section is connected to a channel connected to the hydraulic chamber; the sealing ring cooperates with the first hole section, and the sealing sleeve cooperates with the second hole section; a sliding sleeve is also installed in the second hole section, and the outer wall of the sliding sleeve is in contact with the inner wall of the second hole section, and shear pins for limiting the sliding sleeve are also installed in the second hole section, so that the sliding sleeve closes the channel.

3. The docking device according to claim 2, characterized in that: First sealing grooves are provided on both upper and lower sides of the inner wall of the second hole section connected to the channel. The first sealing groove is located at the matching position of the second hole section and the sliding sleeve. A first sealing ring is installed in the first sealing groove.

4. The docking device according to claim 2, characterized in that: An axial channel and a radial channel communicating with the axial channel are arranged in the main body, the axial channel passes through the upper end surface of the main body, and the radial channel radially passes through the main body; the inner wall of the lower part of the sealing sleeve is in contact with the outer wall of the main body, a gap exists between the upper part of the sealing sleeve and the outer wall of the main body, and a radial flow guide hole is also arranged on the upper part of the sealing sleeve; when the docking device is sealed and installed in the docking hole, the radial channel is located on the upper part of the sealing sleeve, and the flow guide hole corresponds to the channel.

5. The docking device according to claim 4, characterized in that: The upper end of the axial channel is provided with a thread connected to a control pipeline joint.

6. The docking device according to claim 4, characterized in that: The inner wall and the outer wall of the lower part of the sealing sleeve are both provided with a second sealing groove, and the second sealing ring is installed in the second sealing groove.

7. The docking device according to claim 1, characterized in that: The shear force of the first position-limiting shear nail is smaller than the shear force of the second position-limiting shear nail.

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