Wellhead sealing device and sealing method thereof

Abstract

The invention relates to a wellhead sealing device which comprises a Christmas tree, sealing structures are connected to the positions of gates on the two sides of the Christmas tree, a blowout prevention pipe is connected to the Christmas tree, each sealing structure comprises an elastic sealing assembly, and a four-way area at the position of a gate of the Christmas tree is sealed through the elastic sealing assemblies. A driving assembly for driving the elastic sealing assembly to move transversely is arranged on one side of the elastic sealing assembly, and a pressure relief assembly is arranged in the blowout prevention pipe. The application has the effects of reducing the input of a well killing pump truck and well killing fluid, reducing the damage of the well killing fluid to an oil layer and simplifying the operation process.

Description

Technical Field

[0001] The present application relates to the field of oil production engineering, and in particular to a wellhead sealing device and a sealing method thereof. Background Art

[0002] In the field of oilfield production engineering, refer to Figure 1 The polished rod of the pumping well is the connection device between the ground pumping unit and the downhole sucker rod. It also cooperates with the blowout preventer box and the packing inside the blowout preventer box to seal the polished rod and the wellhead of the Christmas tree. Since the polished rod is at the top of the sucker rod column, it bears the upward pulling force and the weight of the entire sucker rod, pump and well fluid. It is also affected by the external environment and well fluid and is easily deformed, worn, corroded and other phenomena; the blowout preventer box is easily damaged due to the high frequency of packing replacement and improper operation; all of the above will cause the wellhead seal to fail, the well fluid to overflow out of control, and the risk of environmental pollution accidents, and the polished rod or blowout preventer box needs to be replaced.

[0003] With regard to the above-mentioned related technologies, the inventors believe that well killing operations must be performed when replacing the bare rod or the blowout preventer box on site, and the operation can only be performed after there is no overflow at the wellhead. The operation procedures are cumbersome and take a long time to produce. The injected well killing fluid will also cause varying degrees of damage to the oil layer, affecting production. Summary of the invention

[0004] In order to reduce the investment in well-killing pump trucks and well-killing fluid, reduce the damage of well-killing fluid to the oil layer, and simplify the operation process, the present application provides a wellhead sealing device and a sealing method thereof.

[0005] The present application provides a wellhead sealing device, which adopts the following technical solution:

[0006] A wellhead sealing device includes an oil tree, sealing structures are connected to gate positions on both sides of the oil tree, a blowout preventer is connected to the oil tree, the sealing structure includes an elastic sealing component, the elastic sealing component seals a four-way area at the gate position of the oil tree, a driving component for driving the elastic sealing component to move laterally is provided on one side of the elastic sealing component, and a pressure relief component is provided inside the blowout preventer.

[0007] Optionally, the driving assembly includes a horizontally arranged support frame, a driving rod is horizontally penetrated inside the support frame, the driving rod is threadedly connected to the support frame, and the driving rod is connected to the elastic sealing assembly via a connecting structure.

[0008] Optionally, the connecting structure includes a connecting head fixedly connected to the support frame, the driving rod passes through the connecting head and is relatively slidably connected, a connecting cavity is opened inside the connecting head, a connector is slidably connected inside the connecting cavity, the connector is fixedly connected to the driving rod, and the connector and the elastic sealing assembly are relatively connected via a cavity seat.

[0009] Optionally, a stuffing box is coaxially fixedly connected to the side of the support frame away from the connector, a pressure cover is threadedly connected to the side of the stuffing box away from the support frame, the interior of the stuffing box is filled with stuffing, and the drive rod passes through the pressure cover and the interior of the stuffing box.

[0010] Optionally, the elastic sealing assembly includes a sealing block, which is made of a compressible material. A sealing cavity is defined inside the sealing block. A fixed block is fixedly connected to a side of the sealing cavity close to the driving structure, and a sliding block is fixedly connected to a side of the sealing cavity away from the driving structure. An elastic member is horizontally arranged between the fixed block and the sliding block.

[0011] Optionally, the fixed block includes a vertically arranged first circular plate, a side of the first circular plate close to the sliding block is coaxially fixedly connected with a first guide ring, the sliding block includes a vertically arranged second circular plate, a side of the second circular plate close to the fixed block is coaxially fixedly connected with a second guide ring, the second guide ring is located inside the first guide ring, and the inner wall of the first guide ring slides in abutment with the outer wall of the second guide ring, and the two ends of the elastic member respectively abut against the first circular plate and the second circular plate.

[0012] Optionally, the blowout preventer includes a bottom tube, the top end of the bottom tube is threadedly connected to a pressure cap, the top wall of the bottom tube is coaxially provided with a first inclined groove, the side walls of the first inclined groove are inclined, the diameter of the side walls of the first inclined groove gradually decreases along the height direction from top to bottom, the interior of the bottom tube is located inside the first inclined groove and is slidably connected with a locking block, and the side wall of the locking block relative to the position of the first inclined groove is provided with a first side wall that cooperates with the first inclined groove.

[0013] Optionally, a second side wall is opened above the first side wall of the locking block, and the diameter of the second side wall gradually increases along the height direction from top to bottom. The pressure cap has a second inclined wall at a position relative to the second side wall, and the inclination direction of the second inclined wall is the same as that of the second side wall.

[0014] Optionally, the pressure relief assembly includes a vent valve fixed on the bottom pipe, the vent valve is relatively connected to the interior of the bottom pipe, and the position where the vent valve is relatively connected to the interior of the bottom pipe is located below the locking block.

[0015] Optionally, a sealing method is also provided, comprising:

[0016] S01: close the production gate of the Christmas tree, release the pressure, disassemble the production gate valve, install the sealing device, and open the production valve;

[0017] S02: Move the sealing block into the inside of the oil pipe, seal the polished rod and the oil pipe spool through the sealing block, and cut off the pressure in the lower part of the wellbore;

[0018] S03: Release the upper pressure, disassemble the blowout preventer box, take it out and separate it from the polished rod, pass the blowout preventer through the polished rod and install it on the tubing spool, close the vent valve, separate the sealing block from the polished rod, move the polished rod upward so that it enters the bottom pipe, move the sealing block into the tubing, seal the pump rod and the tubing spool through the sealing block, and cut off the lower pressure of the wellbore;

[0019] S04: Open the vent valve to release the pressure, remove the lubricant preventer and the tubing spool, move the lubricant preventer upward, replace the polished rod, reinstall the lubricant preventer, close the vent valve, drive the sealing block to separate from the pump rod, lower the polished rod to move the polished rod back to its original position, move the sealing block to seal the polished rod and the tubing spool, and cut off the pressure in the lower part of the wellbore;

[0020] S05: Open the vent valve to release the pressure, disassemble the blowout preventer, take out and detach it from the polished rod, pass the blowout preventer box through the polished rod and install it on the tubing spool, drive the sealing block back to its original position, close the production valve, remove the sealing device, install the valve parts, and restore the original production process of the Christmas tree.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. It can effectively seal the annular space between the small four-way joint of the oil production tree and the polished rod, prevent the overflow of well fluid, and realize the replacement of the polished rod or the blowout preventer box.

[0023] 2. It can avoid using well-killing pump trucks and well-killing fluid, simplify the operation procedures, reduce the production time, and avoid the damage of well-killing fluid to the oil layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a prior art schematic diagram of the Christmas tree in this application.

[0025] Figure 2 It is a schematic diagram of the overall structural sealing state of a wellhead sealing device in an embodiment of the present application.

[0026] Figure 3 It is a schematic diagram of the sealing structure of a wellhead sealing device in an embodiment of the present application when a blowout preventer is not installed.

[0027] Figure 4 It is a schematic diagram of the unsealed state of the overall structure of a wellhead sealing device in an embodiment of the present application when a blowout preventer is not installed.

[0028] Figure 5 It is a schematic diagram of the sealing structure of a wellhead sealing device in an embodiment of the present application when a blowout preventer is installed.

[0029] Figure 6 It is a structural schematic diagram of a blowout preventer of a wellhead sealing device in an embodiment of the present application.

[0030] Explanation of the reference numerals: 1. Christmas tree; 11. Christmas valve; 2. Sealing structure; 21. Support frame; 211. Hand wheel; 22. Driving rod; 23. Connector; 231. Stuffing box; 232. Pressure cover; 24. Connector; 25. Cavity seat; 251. Sealing ring; 26. Sealing block; 261. Sealing cavity; 262. Fixed block; 2621. First circular plate; 2622. First guide ring; 263. Sliding block; 2631. Second circular plate; 2632. Second guide ring; 264. First spring; 27. Sealing seat; 3. Blowout preventer; 31. Bottom pipe; 311. First inclined groove; 32. Pressure cap; 321. Second inclined wall; 33. Locking block; 331. First side wall; 332. Second side wall; 34. Vent valve. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0033] The following is combined with Figure 2-6 This application is described in further detail.

[0034] The present application embodiment discloses a wellhead sealing device. Figure 2 , Figure 3 A wellhead sealing device includes a vertically arranged Christmas tree 1, with Christmas tree 1 having two ends respectively provided with Christmas valves 11, a sealing structure 2 provided at a position relative to the Christmas valves 11, and a blowout preventer 3 provided at the top of the Christmas tree 1.

[0035] The sealing structure 2 includes a horizontally arranged support frame 21, which is a hollow cylindrical structure, and a driving rod 22 is coaxially penetrated inside the support frame 21, and the end of the driving rod 22 away from the Christmas tree 1 completely penetrates the support frame 21 and is relatively threadedly connected. A hand wheel 211 is coaxially rotatably connected to the outer end wall of the support frame 21, and the hand wheel 211 is threadedly connected to the driving rod 22. By rotating the hand wheel 211, the driving rod 22 is driven to move relatively along the axis direction of the support frame 21.

[0036] A connector 23 is fixedly connected to one side of the support frame 21 away from the hand wheel 211. The connector 23 is a cylindrical structure, and a clamp is fixedly connected to one end of the connector 23 away from the support frame 21. A steel ring groove is provided inside the clamp. After the steel ring is installed in the steel ring groove, the clamp is relatively connected and fixed to the valve of the Christmas tree 1.

[0037] The connector 23 is located on one side of the support frame 21 and is fixedly connected to a stuffing box 231. The stuffing box 231 is an annular structure coaxially arranged with the connector 23, and the bottom wall of the stuffing box 231 is closed by the connector 23. Stuffing is installed inside the stuffing box 231. A gland 232 is coaxially arranged at one end of the stuffing box 231 away from the connector 23. The gland 232 and the stuffing box 231 are relatively fixedly connected by bolts.

[0038] The driving rod 22 passes through the gland 232 and the stuffing box 231 , and the gland 232 compresses the stuffing inside the stuffing box 231 , so that the driving rod 22 is sealed by the stuffing.

[0039] A connector 24 is coaxially arranged at the end of the driving rod 22 at one end of the connecting head 23. A hollow circular hole is opened on the side of the connector 24 close to the driving rod 22. The inner diameter of the hollow circular hole is smaller than the outer diameter of the driving rod 22, so that the driving rod 22 can be extended into the interior of the connector 24 through a tight connection to be fixed.

[0040] A cavity seat 25 is coaxially arranged at one end of the connector 24 away from the driving rod 22, and the cavity seat 25 is threadedly connected to the connector 24. A connecting cavity is opened at a position of the connector head 23 relative to the cavity seat 25, and the connector 24 and the cavity seat 25 are located inside the connecting cavity, and the outer wall of the cavity seat 25 abuts against the side wall of the connecting cavity to slide relative to each other.

[0041] A circular hole is formed on the outer wall of the connector 24 near the cavity seat 25, and the axis of the circular hole is arranged along the radial direction of the connector 24. The connector 24 is relatively connected to the cavity seat 25 by driving the circular hole to rotate.

[0042] The cavity seat 25 is a cylindrical structure, and a sealing ring 251 is coaxially sleeved on the outer wall of the cavity seat 25. The sealing ring 251 is fixedly connected to the cavity seat 25. The end of the cavity seat 25 away from the connector 24 is connected to a sealing block 26 through a pin. The sealing block 26 is a deformable elastic structure, and a sealing cavity 261 is opened inside the sealing block 26. A fixed block 262 is fixedly connected to the side of the sealing cavity 261 close to the cavity seat 25, and a sliding block 263 is fixedly connected to the side of the sealing cavity 261 away from the cavity seat 25.

[0043] The fixed block 262 includes a vertically arranged first circular plate 2621 , which is coaxially arranged with the sealing block 26 , and a first guide ring 2622 is coaxially fixedly connected to one side of the first circular plate 2621 close to the moving block, and the outer diameter of the first guide ring 2622 is the same as the outer diameter of the first circular plate 2621 .

[0044] The sliding block 263 includes a vertically arranged second circular plate 2631, which is coaxially arranged with the sealing block 26, and a second guide ring 2632 is coaxially fixedly connected to the side of the second circular plate 2631 close to the fixed block 262, the outer diameter of the second guide ring 2632 is the same as the outer diameter of the first guide ring 2622, and the second guide ring 2632 is located inside the first guide ring 2622, so that the inner wall of the first guide ring 2622 and the outer wall of the second guide ring 2632 are relatively abutted and slidably connected.

[0045] A first spring 264 is horizontally disposed between the first disk and the second disk. One end of the first spring 264 abuts against and is relatively fixed to the first disk, and the other end of the first spring 264 abuts against and is relatively fixed to the second disk.

[0046] Reference Figure 4 , Figure 5 When the two relative driving rods 22 drive the two relative sealing blocks 26 to move toward a relatively close side and abut against each other, the two sealing blocks 26 are compressed and deformed, and the fixed block 262 and the movable block move toward a relatively close direction, compressing the first spring 264, and the side wall of the sealing block 26 seals the gap between the four-way of the pipeline and the light rod.

[0047] When the two opposite driving rods 22 drive the two opposite sealing blocks 26 to move toward the opposite side, the first spring 264 pushes the fixed block 262 and the movable block to move in the opposite direction, thereby restoring the sealing block 26 to the initial state.

[0048] Reference Figure 3 , Figure 4The sealing block 26 is fixedly connected to the side away from the cavity seat 25 with a sealing seat 27. Two sealing seats 27 are arranged along the height direction, and a gap is left between the two sealing seats 27. The sealing seats 27 of the two opposite sealing blocks 26 are staggered along the height direction. The side wall of the sealing seat 27 on the side away from the sealing block 26 is vertically provided with an avoidance hole, and the avoidance hole can be inserted into the polished rod, so that the polished rod is sealed by the sealing seat 27.

[0049] Reference Figure 2 , Figure 6 The blowout preventer 3 includes a vertically arranged bottom pipe 31, which is a hollow structure, and a clamp head is arranged on the outer side of the bottom end of the bottom pipe 31, a steel ring groove is opened inside the clamp head, and an aperture is installed to relatively connect the bottom pipe 31 with the cross.

[0050] The top end of the lubricator 3 is threadedly connected with a pressure cap 32 , and the top end side wall inside the lubricator 3 is provided with a first inclined groove 311 , the side wall of the first inclined groove 311 is inclined, and the diameter gradually decreases along the height direction from top to bottom.

[0051] A locking block 33 is provided at the top end of the bottom tube 31 and inside the pressure cap 32. A first side wall 331 is opened at the outer wall of the locking block 33 and the position of the first inclined groove 311. The first side wall 331 is inclined, and the inclination direction of the first side wall 331 is the same as the inclination direction of the first inclined groove 311. The first side wall 331 slides in contact with the first inclined groove 311.

[0052] A second inclined wall 321 is provided at the bottom wall of the pressing cap 32. The second inclined wall 321 is inclined and its diameter gradually increases along the height direction from top to bottom. A second side wall 332 is provided above the first side wall 331 of the locking block 33. The second side wall 332 has the same inclination direction as the second inclined wall 321. When the pressing cap 32 moves downward, the second side wall 332 of the locking block can be inserted into the interior of the second inclined wall 321. By pressing the pressing cap 32 downward, the locking block is pushed to be locked.

[0053] A through hole for the polished rod to pass through is provided at the top wall of the pressing cap 32 and the center position of the locking block, so as to facilitate the installation of the polished rod.

[0054] A vent valve 34 is fixedly connected to the side wall of the bottom pipe 31 . The vent valve 34 is relatively connected to the inside of the bottom pipe 31 , and the position where the vent valve 34 is relatively connected to the bottom pipe 31 is located below the locking block 33 .

[0055] The present application also provides a sealing method, comprising the following steps:

[0056] S01: Close the production gates on both sides of the Christmas tree 1, release the pressure, remove the pipe valves on both sides of the production gates; install the sealing device 1 on both sides, and open the production gates;

[0057] S02: Rotate the hand wheels 21111 on both sides simultaneously to move the sealing block 26 into the interior of the oil pipe, and seal the polished rod and the oil pipe spool through the sealing block 26 to cut off the pressure in the lower part of the wellbore;

[0058] S03: After releasing the upper pressure, disassemble the blowout preventer box, take it out and separate it from the polished rod, pass the blowout preventer 3 through the polished rod and install it on the tubing spool, close the vent valve 34, separate the sealing block 26 from the polished rod, move the polished rod upward so that it enters the bottom pipe 31, move the sealing block 26 into the tubing, seal the pump rod and the tubing spool through the sealing block 26, and cut off the lower pressure of the wellbore;

[0059] S04: Open the vent valve 34 to release the pressure, disassemble the lubricant preventer 3 and the tubing spool, move the lubricant preventer 3 upward, replace the polished rod, reinstall the lubricant preventer 3, close the vent valve 34, drive the sealing block 26 to disengage from the pump rod, lower the polished rod to move the polished rod back to its original position, move the sealing block 26 to seal the polished rod and the tubing spool, and cut off the pressure in the lower part of the wellbore;

[0060] S05: Open the vent valve 34 to release the pressure, disassemble the blowout preventer 3, take out and detach it from the polished rod, pass the blowout preventer box through the polished rod and install it on the tubing spool, drive the sealing block 26 back to its original position, close the production valve, remove the sealing device, install the valve parts, and restore the original production process of the Christmas tree 1.

[0061] In the present invention, the term "plurality" means at least two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0062] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A wellhead sealing device, comprising a Christmas tree (1), characterized in that: The gate positions on both sides of the Christmas tree (1) are connected to sealing structures (2), the Christmas tree (1) is connected to a lubricating preventer (3), the sealing structure (2) comprises an elastic sealing component, the elastic sealing component seals the four-way area at the gate position of the Christmas tree (1), one side of the elastic sealing component is provided with a driving component for driving the elastic sealing component to move laterally, and the lubricating preventer (3) is provided with a pressure relief component inside.

2. A wellhead sealing device according to claim 1, characterized in that: The driving assembly comprises a horizontally arranged support frame (21), a driving rod (22) is horizontally penetrated inside the support frame (21), the driving rod (22) is threadedly connected to the support frame (21), and the driving rod (22) is connected to the elastic sealing assembly via a connecting structure.

3. A wellhead sealing device according to claim 2, characterized in that: The connection structure comprises a connecting head (23) fixedly connected to the support frame (21); the driving rod (22) penetrates the connecting head (23) and is relatively slidably connected thereto; a connecting cavity is provided inside the connecting head (23); a connector (24) is slidably connected inside the connecting cavity; the connector (24) is fixedly connected to the driving rod (22); and the connector (24) and the elastic sealing component are relatively connected via a cavity seat (25).

4. A wellhead sealing device according to claim 3, characterized in that: A stuffing box (231) is coaxially fixedly connected to the side of the support frame (21) facing away from the connector (23), and a pressure cover (232) is threadedly connected to the side of the stuffing box (231) facing away from the support frame (21). The stuffing box (231) is filled with stuffing, and the drive rod (22) passes through the pressure cover (232) and the stuffing box (231).

5. A wellhead sealing device according to claim 1, characterized in that: The elastic sealing component comprises a sealing block (26), the sealing block (26) is made of a compressible material, a sealing cavity (261) is provided inside the sealing block (26), a fixed block (262) is fixedly connected to a side of the sealing cavity (261) close to the driving structure, a sliding block (263) is fixedly connected to a side of the sealing cavity (261) away from the driving structure, and an elastic member is horizontally arranged between the fixed block (262) and the sliding block (263).

6. A wellhead sealing device according to claim 5, characterized in that: The fixed block (262) includes a first circular plate (2621) arranged vertically, and a first guide ring (2622) is coaxially fixedly connected to the first circular plate (2621) on one side close to the sliding block (263); the sliding block (263) includes a second circular plate (2631) arranged vertically, and a second guide ring (2632) is coaxially fixedly connected to the second circular plate (2631) on one side close to the fixed block (262); the second guide ring (2632) is located inside the first guide ring (2622), and the inner wall of the first guide ring (2622) abuts and slides with the outer wall of the second guide ring (2632); and the two ends of the elastic member abut with the first circular plate (2621) and the second circular plate (2631) respectively.

7. A wellhead sealing device according to claim 1, characterized in that: The blowout preventer (3) comprises a bottom tube (31), the top end of the bottom tube (31) is threadedly connected with a pressure cap (32), the top wall of the bottom tube (31) is coaxially provided with a first inclined groove (311), the side wall of the first inclined groove (311) is inclined, the diameter of the side wall of the first inclined groove (311) gradually decreases along the height direction from top to bottom, the inside of the bottom tube (31) is slidably connected with a locking block (33) located inside the first inclined groove (311), and the side wall of the locking block relative to the position of the first inclined groove (311) is provided with a first side wall (331) corresponding to the first inclined groove (311).

8. A wellhead sealing device according to claim 7, characterized in that: A second side wall (332) is provided above the first side wall (331) of the locking block (33), and the diameter of the second side wall (332) gradually increases along the height direction from top to bottom. A second inclined wall (321) is provided at a position of the pressure cap (32) relative to the second side wall (332), and the inclination direction of the second inclined wall (321) is the same as that of the second side wall (332).

9. A wellhead sealing device according to claim 7, characterized in that: The pressure relief assembly comprises a vent valve (34) fixed on the bottom pipe (31), the vent valve (34) being relatively connected to the interior of the bottom pipe (31), and the position where the vent valve (34) is relatively connected to the interior of the bottom pipe (31) is located below the locking block (33).

10. A wellhead sealing method, characterized in that: A wellhead sealing device according to any one of claims 1 to 9, the method comprising: S01: closing the production gate of the Christmas tree (1), releasing the pressure, disassembling the production gate valve components, installing the sealing device, and opening the production valve; S02: moving the sealing block (26) into the interior of the oil pipe, sealing the polished rod and the oil pipe spool by the sealing block (26), and cutting off the pressure in the lower part of the wellbore; S03: Release the upper pressure, disassemble the blowout preventer box, take it out and separate it from the polished rod, pass the blowout preventer (3) through the polished rod and install it on the tubing spool, close the vent valve (34), separate the sealing block (26) from the polished rod, move the polished rod upward so that the polished rod enters the bottom pipe (31), move the sealing block (26) into the tubing, seal the pump rod and the tubing spool through the sealing block (26), and cut off the lower pressure of the wellbore; S04: open the vent valve (34) to release the pressure, disassemble the lubricant preventer (3) and the tubing spool, move the lubricant preventer (3) upward, replace the polished rod, reinstall the lubricant preventer (3), close the vent valve (34), drive the sealing block (26) to separate from the pump rod, lower the polished rod so that the polished rod moves back to its original position, move the sealing block (26) to seal the polished rod and the tubing spool, and cut off the pressure in the lower part of the wellbore; S05: Open the vent valve (34) to release the pressure, disassemble the blowout preventer (3), take out and detach the polished rod, pass the blowout preventer box through the polished rod and install it on the tubing spool, drive the sealing block (26) back to its original position, close the production valve, remove the sealing device, install the valve parts, and restore the original production process of the Christmas tree (1).

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