An assembly tooling and assembly method for subsea production tree and wellhead connector.

Abstract

This invention discloses an assembly fixture for subsea production trees and wellhead connectors, comprising a production tree maintenance pile, a mounting base, an inner body rotating fixture, and an outer body rotating fixture. The inner body rotating fixture is located inside the production tree maintenance pile, and its upper end is connected to the inner body of the wellhead connector. The mounting base is located above the production tree maintenance pile and supports the production tree body. The inner body rotating fixture rotates the inner body of the wellhead connector. The outer body rotating fixture is located on the outside of the wellhead connector outer shell and rotates the wellhead connector outer shell. This invention, through the design of the assembly fixture and assembly method, allows the production tree body and wellhead connector to be installed in modules simultaneously, followed by docking and assembly, greatly improving installation efficiency and shortening the production cycle. The beneficial effects are even greater when the shallow-water subsea production tree body and wellhead connector are not manufactured by the same company.

Description

Technical Field

[0001] This invention relates to the field of oil and gas drilling and production equipment technology, and in particular to an assembly tool and method for subsea wellhead connectors and wellhead connectors. Background Technology

[0002] Currently, the development of offshore oil and gas fields requires two types of subsea equipment: subsea wellheads and subsea production trees. During drilling, drilling operations are carried out through the subsea wellhead to establish a production channel to the producing formation. During well completion and production, well completion, testing, and production are carried out by installing subsea production trees. The production trees are controlled to open and close the production channels and monitor the pressure and temperature information of the production channels.

[0003] Wellhead connectors are devices installed on subsea production trees to connect to subsea wellheads. During well completion and production processes, deepwater operating platforms and risers are affected by wind, waves, and currents, generating hundreds of tons of drag force and millions of Newton-meters of bending moment near the wellhead connector. This places extremely high demands on the locking mechanism and structural strength of the wellhead connector. Furthermore, to ensure no oil or gas leakage occurs during drilling, completion, and production, the sealing performance of the wellhead connectors used for connection requires extremely high standards.

[0004] To ensure that subsea production trees and wellhead connectors meet various stringent requirements, the traditional assembly method for these components involves starting with individual parts and assembling them sequentially until final assembly is complete. This results in long production cycles and high manufacturing costs. Therefore, there is an urgent need to develop a new assembly tooling and method for subsea production trees and wellhead connectors. Summary of the Invention

[0005] The purpose of this application is to provide an assembly tooling and assembly method for subsea production trees and wellhead connectors, which solves the problems existing in the traditional assembly method of production tree body and wellhead connector, improves installation efficiency, and shortens the production cycle.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] This invention provides an assembly fixture for subsea production tree and wellhead connector, comprising a production tree maintenance pile, a mounting base, an inner body rotating fixture, and an outer body rotating fixture. The inner body rotating fixture is disposed inside the production tree maintenance pile, and its upper end is connected to the inner body of the wellhead connector. The mounting base is disposed above the production tree maintenance pile and supports the production tree body. The inner body rotating fixture rotates the inner body of the wellhead connector to connect it to the production tree body. The outer body rotating fixture is disposed outside the outer body of the wellhead connector and rotates the outer body of the wellhead connector to connect it to the production tree body.

[0008] Furthermore, the inner body rotating fixture includes a rotating sleeve, a lifting sleeve, and a support block. The lower end of the rotating sleeve is connected to the middle of the wellhead maintenance pile, and the upper end of the rotating sleeve is threadedly connected to the lower end of the lifting sleeve. The support block is located at the top of the lifting sleeve and is used to connect with the limiting groove of the inner body of the wellhead connector.

[0009] Furthermore, a rotating handle is provided on the outer side of the lifting sleeve.

[0010] Furthermore, the outer casing rotating fixture includes a rotating ring and a rotating ring handle. The rotating ring has uniformly distributed rotating ring through holes on its cylindrical surface. The rotating ring through holes are used to connect with threaded holes on the side of the wellhead connector outer casing. The rotating ring handle is located on the outside of the rotating ring's cylindrical surface.

[0011] Furthermore, the oil well maintenance pile includes a maintenance pile main frame, guide columns, and a maintenance pile central disc. The maintenance pile central disc is located in the middle of the maintenance pile main frame, and multiple guide columns are vertically located at the edge of the maintenance pile main frame. The maintenance pile central disc is connected to the lower end of the rotating sleeve.

[0012] Furthermore, the central disc of the maintenance pile is provided with multiple threaded holes, and the lower end of the rotating sleeve is provided with a flange, and the flange is provided with multiple fixing holes corresponding to the threaded holes.

[0013] Furthermore, the mounting base includes a base main frame, base guide pile holes, and a base central disc. The base main frame is provided with base guide pile holes corresponding to the guide columns. The base central disc is located in the middle of the base main frame. A base support block is provided on the base central disc. The lower end of the tree body passes through the middle of the base central disc. The base support block supports and positions the tree body.

[0014] Furthermore, the base support block includes a first support block and a second support block. The upper surface of the first support block includes an inclined surface that slopes inward from top to bottom and a horizontal surface connected to the lower end of the inclined surface. The upper surface of the second support block is a horizontal surface. The inclined surface is adapted to the outer inclined surface at the lower end of the oil well tree body.

[0015] Furthermore, the base center disc is provided with an arc-shaped first positioning groove and a second positioning groove. The center of the first positioning groove and the second positioning groove are coaxial with the rotation center of the inner body rotating tool and the outer body rotating tool. The first support block is provided with a connecting hole. The first support block is connected to the first positioning groove by bolts. The outer side of the second support block is provided with a vertical positioning post. The upper end of the positioning post is lower than the second support block. The second positioning groove has the same radius as the first positioning groove. The positioning post passes vertically through the second positioning groove. The positioning post is provided with external threads and a nut. The positioning post is connected to the second positioning groove by the nut.

[0016] An assembly method for the aforementioned assembly tooling for subsea production tree and wellhead connector according to the present invention includes the following steps:

[0017] S1. Installation of oil well maintenance piles and internal rotating fixtures;

[0018] Step S1 includes:

[0019] S101. Place the oil well maintenance stakes on site;

[0020] S102. Place the inner body rotating fixture at the center disc of the maintenance pile of the oil well tree maintenance pile. After confirming that the fixing hole of the inner body rotating fixture matches the threaded hole of the center disc of the maintenance pile, tighten the screws to fix the inner body rotating fixture.

[0021] S2. The wellhead connector docks with the inner body rotating tooling and the outer body rotating tooling;

[0022] Step S2 includes:

[0023] S201. Lift the wellhead connector upright and place it on the upper part of the inner body rotating fixture. Ensure that the support block of the inner body rotating fixture is inserted into the limiting groove of the inner body of the wellhead connector.

[0024] S202. Fit the outer shell rotating tooling into the wellhead connector, so that the swivel through hole of the outer shell rotating tooling is aligned with the threaded hole on the side of the wellhead connector outer shell, and tighten the bolts to install the outer shell rotating tooling onto the wellhead connector outer shell.

[0025] S3. Connect the installation base to the maintenance pile of the wellhead;

[0026] Step S3 includes:

[0027] S301. By rotating the handle of the inner body rotating tool, rotate the lifting sleeve to move the wellhead connector to the lowest position;

[0028] S302. Hoist the installation base to the top of the Christmas tree maintenance pile, lower the installation base, and ensure that the guide pile hole of the base is embedded in the guide column of the Christmas tree maintenance pile to complete the connection;

[0029] S4. Install the main body of the wellhead;

[0030] Step S4 includes:

[0031] S401. Lift and level the main body of the oil wellhead;

[0032] S402. Place the entire tree body vertically onto the upper surface of the central disc of the mounting base;

[0033] S5. Connection between the wellhead connector and the Christmas tree body.

[0034] S501. By rotating the handle of the inner body rotating tool, rotate the lifting sleeve to lift the wellhead connector until the wellhead connector housing contacts the tree body of the production tree body;

[0035] S502. Hover the wellhead connector, continue to rotate the lifting sleeve, and rotate the inner body of the wellhead connector so that the inner body of the wellhead connector is connected to the threaded connection of the tree body;

[0036] S503. By rotating the housing tool, the wellhead connector housing is rotated so that the wellhead connector housing is connected to the tree body threaded connection;

[0037] S504. Repeat step S502 to connect the inner body of the wellhead connector to the threaded connection of the tree body in place;

[0038] S505. Repeat step S503 to connect the wellhead connector housing to the tree body threaded connection in place;

[0039] S506. Install the limiting screws of the wellhead connector and the tree body, and then vertically lift out the oil production tree body and the wellhead connector to complete the assembly.

[0040] In summary, the technical effects and advantages of this invention are as follows: Through the design of assembly tooling and assembly methods, this invention enables the production tree body and the wellhead connector to be installed in modules simultaneously and then assembled together, which greatly improves installation efficiency and shortens the production cycle. In particular, the beneficial effects are even better when the production tree body and the wellhead connector in shallow water are not produced by the same manufacturer. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the assembly tooling for subsea production tree and wellhead connector in one embodiment of the present invention;

[0043] Figure 2 This is a schematic diagram of the mounting base in one embodiment of the present invention;

[0044] Figure 3 This is a schematic diagram of the internal rotating tooling in one embodiment of the present invention;

[0045] Figure 4This is a schematic diagram of the outer shell rotating tool in one embodiment of the present invention.

[0046] Among them, 1. Christmas tree maintenance pile; 11. Maintenance pile main frame; 12. Guide column; 13. Maintenance pile center disc; 2. Installation base; 21. Base main frame; 22. Base guide pile hole; 23. Base center disc; 24. First support block; 25. Second support block; 26. Positioning column; 231. First positioning groove; 232. Second positioning groove; 3. Inner body rotating fixture; 31. Rotating sleeve; 32. Lifting sleeve; 33. Support block; 34. Rotating handle; 4. Outer body rotating fixture; 41. Rotary ring; 42. Rotary ring handle; 43. Rotary ring through hole; 01. Wellhead connector inner body; 02. Christmas tree body; 03. Wellhead connector outer body. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0051] This embodiment proposes an assembly tooling for subsea production tree and wellhead connector, such as... Figures 1-4 As shown, the assembly includes a Christmas tree maintenance pile 1, a mounting base 2, an inner body rotating fixture 3, and an outer shell rotating fixture 4. The inner body rotating fixture 3 is located inside the Christmas tree maintenance pile 1, and its upper end is connected to the inner body 01 of the wellhead connector. The mounting base 2 is located above the Christmas tree maintenance pile 1 and is used to support the Christmas tree body 02. The inner body rotating fixture 3 is used to rotate the inner body 01 of the wellhead connector, so that the inner body 01 of the wellhead connector is connected to the Christmas tree body 02. The outer shell rotating fixture 4 is located outside the outer shell 03 of the wellhead connector and is used to rotate the outer shell 03 of the wellhead connector, so that the outer shell 03 of the wellhead connector is connected to the Christmas tree body 02.

[0052] Specifically, the inner body rotating fixture 3 includes a rotating sleeve 31, a lifting sleeve 32, and a support block 33. The lower end of the rotating sleeve 31 is connected to the middle of the wellhead maintenance pile 1, and the upper end of the rotating sleeve 31 is threadedly connected to the lower end of the lifting sleeve 32. The upper part of the rotating sleeve 31 has external threads, and the lower part of the lifting sleeve 32 has internal threads. The support block 33 is located at the top of the lifting sleeve 32 and is used to connect with the limiting groove of the inner body 01 of the wellhead connector. The support block 33 is bolted to the top of the lifting sleeve 32 and can be embedded in the limiting groove of the inner body 01 of the wellhead connector, thereby realizing the docking of the inner body rotating fixture 3 and the inner body 01 of the wellhead connector.

[0053] Furthermore, a rotating handle 34 is provided on the outer side of the lifting sleeve 32. Optionally, the rotating handle 34 is symmetrically welded to the outer side of the lifting sleeve 32, serving as a force application point for rotating the lifting sleeve 32. When the lifting sleeve 32 is rotated by the rotating handle 34, the inner body 01 of the wellhead connector will rotate together. At the same time, through the threaded action between the rotating sleeve 31 and the lifting sleeve 32, the rotational motion can be converted into linear motion in the vertical direction of the wellhead connector.

[0054] Specifically, the outer casing rotating fixture 4 includes a rotating ring 41 and a rotating ring handle 42, which can optionally be welded together. The cylindrical surface of the rotating ring 41 is evenly distributed with rotating ring through holes 43, which are used to connect with threaded holes on the side of the wellhead connector outer casing 03. The outer casing rotating fixture 4 can be installed onto the wellhead connector outer casing 03 using bolts. The rotating ring handle 42 is located on the outer side of the cylindrical surface of the rotating ring 41. Rotating the outer casing rotating fixture 4 via the rotating ring handle 42 will cause the wellhead connector outer casing 03 to rotate together.

[0055] Specifically, the oil well maintenance pile 1 includes a main frame 11, guide posts 12, and a central disc 13. In this embodiment, these three components may be welded together. The central disc 13 is located in the middle of the main frame 11, and multiple guide posts 12 are vertically positioned along the edge of the main frame 11. The central disc 13 is connected to the lower end of the rotating sleeve 31.

[0056] Furthermore, the central disc 13 of the maintenance pile is provided with multiple threaded holes, and the lower end of the rotating sleeve 31 is provided with a flange, the flange having multiple fixing holes corresponding to the threaded holes. The rotating sleeve 31 can be fixed to the central disc 13 of the maintenance pile of the oil well maintenance pile 1 by screws.

[0057] Specifically, the mounting base 2 includes a base main frame 21, base guide pile holes 22, and a base central disk 23. The base main frame 21 has base guide pile holes 22 corresponding to the guide columns 12. The base central disk 23 is located in the middle of the base main frame 21. A base support block is provided on the base central disk 23. The lower end of the tree body 02 passes through the middle of the base central disk 23. The base support block supports and positions the tree body 02. Further, the base support block includes a first support block 24 and a second support block 25. The upper surface of the first support block 24 includes an inclined surface that slopes inward from top to bottom and a horizontal surface connected to the lower end of the inclined surface. The upper surface of the second support block 25 is a horizontal surface. The inclined surface is adapted to the outer inclined surface of the lower end of the tree body 02. The first support block 24 provides support and positioning, while the second support block 25 provides support. The base center disc 23 has an arc-shaped first positioning groove 231, the center of which is coaxial with the rotation centers of the inner body rotating fixture 3 and the outer body rotating fixture 4. The first support block 24 has a connecting hole and is connected to the first positioning groove 231 by bolts. The outer side of the second support block 25 has a vertical positioning post 26, and the base center disc 23 has an arc-shaped second positioning groove 232, the center of which is coaxial with the center of the first positioning groove 231 and the radius is similar. Similarly, the positioning post 26 vertically passes through the second positioning groove 232. The positioning post 26 is provided with external threads and a nut. The positioning post 26 is connected to the second positioning groove 232 by tightening the nut. The first support block 24 contacts one side wall of the tree body 02, and the positioning post 26 contacts the other side wall of the tree body 02. Since the rotation centers of the first positioning groove 231, the second positioning groove 232, the inner body rotating tool 3, and the outer body rotating tool 4 are coaxial, the tree body 02 and the wellhead connector are coaxial. Optionally, the base main frame 21 is square, and the base guide pile holes 22 are located at the four corners of the base main frame 21. Optionally in this embodiment, the base main frame 21, the base guide pile holes 22, and the base center disk 23 are welded together, and the base support block is fixed to the upper surface of the base center disk 23 with bolts. The mounting base 2 can support the weight of the tree body 02 and limit the tree body 02 by the first support block 24 and the positioning post 26. The base guide pile hole 22 of the mounting base 2 can be embedded into the guide post 12 of the tree maintenance pile 1 to realize the docking of the mounting base 2 and the tree maintenance pile 1.

[0058] This embodiment also provides an assembly method for the aforementioned assembly fixture for subsea production tree and wellhead connector, comprising a mounting base 2, a production tree maintenance pile 1, an inner body rotating fixture 3, and an outer shell rotating fixture 4. The mounting base 2 and the production tree maintenance pile 1 are connected vertically through guide pile holes and remain concentric, forming a platform foundation for assembling the production tree body 02 and the wellhead connector. The production tree body 02 is located at the center of the upper surface of the mounting base 2, the inner body rotating fixture 3 is located at the center of the upper surface of the production tree maintenance pile 1, the wellhead connector is placed on the upper part of the inner body rotating fixture 3, and the outer shell rotating fixture 4 is installed on the outer shell of the wellhead connector. By rotating the inner body rotating fixture 3 and the outer shell rotating fixture 4, the wellhead connector is lifted until its outer shell contacts the tree body of the wellhead tree body 02. Then, the inner body rotating fixture 3 and the outer shell rotating fixture 4 are rotated sequentially to connect the bottom threaded connection of the tree body to the outer shell and inner body of the wellhead connector, thus completing the assembly of the wellhead tree body 02 and the wellhead connector. In this embodiment, the wellhead tree body 02 is illustrated using a shallow water subsea wellhead tree body as an example. The method specifically includes the following steps:

[0059] S1: Installation of oil well maintenance pile 1 and inner rotating fixture 3

[0060] S101. Use slings to place the oil well maintenance pile 1 on the site;

[0061] S102. Use slings to place the inner body rotating fixture 3 at the center disc 13 of the maintenance pile of the oil well maintenance pile 1. After confirming that the fixing hole of the inner body rotating fixture 3 matches the threaded hole of the center disc 13 of the maintenance pile, tighten the screws to fix the inner body rotating fixture 3.

[0062] S2: Wellhead connector docking with rotary tooling

[0063] S201. Using a four-point lifting sling, the wellhead connector is mechanically unlocked and shackled to lift it upright and slowly place it on the upper part of the inner body rotating fixture 3. It must be ensured that the support block 33 of the inner body rotating fixture 3 is inserted into the limiting groove of the inner body 01 of the wellhead connector.

[0064] S202. Using slings, fit the outer casing rotating fixture 4 into the wellhead connector, so that the swivel through hole 43 of the outer casing rotating fixture 4 is aligned with the threaded hole on the side of the wellhead connector outer casing 03, and tighten the screws to install the outer casing rotating fixture 4 onto the wellhead connector outer casing 03.

[0065] S3: Connect base 2 to tree trunk maintenance pile 1

[0066] S301. By rotating the handle 34 of the inner body rotating tool 3, the lifting sleeve 32 is rotated to move the wellhead connector to the lowest position;

[0067] S302. Using slings, hoist the mounting base 2 to the upper part of the tree maintenance pile 1, lower the mounting base 2, and ensure that its base guide pile hole 22 is embedded in the guide column 12 of the tree maintenance pile 1 to complete the connection.

[0068] S4: Install the wellhead unit 02

[0069] S401. The shallow water subsea production tree body is lifted and leveled using tools such as four-point lifting slings, electric hoists, and levels.

[0070] S402. Slowly and vertically lower the shallow water subsea tree body to the upper surface of the base center disc 23 of the mounting base 2, and use the first support block 24, the second support block 25 and the positioning column 26 to position and support the tree body 02.

[0071] S5: The production tree body 02 connects to the wellhead connector.

[0072] S501. By rotating the handle 34 of the inner body rotating tool 3, the lifting sleeve 32 is rotated to lift the wellhead connector until the wellhead connector outer shell 03 contacts the tree body of the shallow water subsea oil production tree body 02.

[0073] S502. Hover the wellhead connector, continue to rotate the lifting sleeve 32, rotate the inner body 01 of the wellhead connector, so that the inner body 01 of the wellhead connector is connected to the threaded connection of the tree body;

[0074] S503, by rotating the outer casing tool 4, the wellhead connector outer casing 03 is rotated, so that the wellhead connector outer casing 03 is connected to the tree body threaded connection;

[0075] S504. Repeat the method in S502, and connect the inner body 01 of the wellhead connector to the tree body threaded connection in place;

[0076] S505. Repeat the S503 method, observe through the tooling observation hole, and connect the wellhead connector housing 03 to the tree body threaded connection in place (align with the limit screw hole);

[0077] S506, install the limiting screws of the wellhead connector and the tree body, and then vertically lift out the shallow water subsea oil production tree body and the wellhead connector body to complete the assembly.

[0078] This embodiment, through the design of assembly tooling and assembly methods, enables the production tree body and wellhead connector to be installed in modules simultaneously and then assembled together, greatly improving installation efficiency and shortening the production cycle. The beneficial effects are even better when the production tree body and wellhead connector in shallow water are not manufactured by the same company.

[0079] Although preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not limiting. Those skilled in the art can make many specific modifications under the guidance of the present invention without departing from the spirit of the invention and the scope of protection of the claims, and these modifications all fall within the scope of protection of the present invention.

Claims

1. An assembly tooling for subsea production tree and wellhead connector, characterized in that: The device includes a Christmas tree maintenance pile, an installation base, an inner body rotating fixture, and an outer body rotating fixture. The inner body rotating fixture is located inside the Christmas tree maintenance pile, and its upper end is connected to the inner body of the wellhead connector. The installation base is located above the Christmas tree maintenance pile and is used to support the Christmas tree body. The inner body rotating fixture is used to drive the inner body of the wellhead connector to rotate, so that the inner body of the wellhead connector is connected to the Christmas tree body. The outer body rotating fixture is located on the outside of the outer body of the wellhead connector and is used to drive the outer body of the wellhead connector to rotate, so that the outer body of the wellhead connector is connected to the Christmas tree body. The inner body rotating fixture includes a rotating sleeve, a lifting sleeve, and a support block. The lower end of the rotating sleeve is connected to the middle of the wellhead maintenance pile, and the upper end of the rotating sleeve is threadedly connected to the lower end of the lifting sleeve. The support block is located at the top of the lifting sleeve and is used to connect with the limiting groove of the inner body of the wellhead connector. The lifting sleeve is provided with a rotating handle on the outside of the sleeve body; The outer casing rotating fixture includes a rotating ring and a rotating ring handle. The rotating ring has rotating ring through holes evenly distributed on its cylindrical surface. The rotating ring through holes are used to connect with threaded holes on the side of the wellhead connector outer casing. The rotating ring handle is located on the outside of the rotating ring's cylindrical surface.

2. The assembly tool for a subsea Christmas tree to wellhead connector of claim 1, wherein: The oil well maintenance pile includes a main frame, guide columns, and a central disc. The central disc is located in the middle of the main frame, and multiple guide columns are vertically located at the edge of the main frame. The central disc is connected to the lower end of a rotating sleeve.

3. The assembly tool for a subsea Christmas tree to wellhead connector of claim 2, wherein: The central disc of the maintenance pile has multiple threaded holes, and the lower end of the rotating sleeve has a flange with multiple fixing holes corresponding to the threaded holes.

4. The assembly tool for a subsea Christmas tree to wellhead connector of claim 2 or 3, wherein: The mounting base includes a main base frame, base guide pile holes, and a base center disc. The base main frame has base guide pile holes corresponding to the guide columns. The base center disc is located in the middle of the base main frame. A base support block is provided on the base center disc. The lower end of the tree body passes through the middle of the base center disc. The base support block supports and positions the tree body.

5. The assembly tool for a subsea Christmas tree to wellhead connector of claim 4, wherein: The base support block includes a first support block and a second support block. The upper surface of the first support block includes an inclined surface that slopes inward from top to bottom and a horizontal surface connected to the lower end of the inclined surface. The upper surface of the second support block is a horizontal surface. The inclined surface is adapted to the outer inclined surface at the lower end of the oil well tree body.

6. The assembly tooling for subsea production tree and wellhead connector according to claim 5, characterized in that: The base has an arc-shaped first positioning groove and a second positioning groove on its central disc. The centers of the first and second positioning grooves are coaxial with the rotation centers of the inner body rotating tool and the outer body rotating tool. The first support block has a connecting hole and is connected to the first positioning groove by bolts. The outer side of the second support block has a vertical positioning post. The upper end of the positioning post is lower than the second support block. The second positioning groove has the same radius as the first positioning groove. The positioning post passes vertically through the second positioning groove. The positioning post has external threads and a nut and is connected to the second positioning groove by the nut.

7. An assembly method for the assembly tooling for the subsea production tree and wellhead connector as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Installation of oil well maintenance piles and internal rotating fixtures; Step S1 includes: S101. Place the oil well maintenance stakes on site; S102. Place the inner body rotating fixture at the center disc of the maintenance pile of the oil well tree maintenance pile. After confirming that the fixing hole of the inner body rotating fixture matches the threaded hole of the center disc of the maintenance pile, tighten the screws to fix the inner body rotating fixture. S2. The wellhead connector docks with the inner body rotating tooling and the outer body rotating tooling; Step S2 includes: S201. Lift the wellhead connector upright and place it on the upper part of the inner body rotating fixture. Ensure that the support block of the inner body rotating fixture is inserted into the limiting groove of the inner body of the wellhead connector. S202. Fit the outer shell rotating tooling into the wellhead connector, so that the swivel through hole of the outer shell rotating tooling is aligned with the threaded hole on the side of the wellhead connector outer shell, and tighten the bolts to install the outer shell rotating tooling onto the wellhead connector outer shell. S3. Connect the installation base to the maintenance pile of the wellhead; Step S3 includes: S301. By rotating the handle of the inner body rotating tool, rotate the lifting sleeve to move the wellhead connector to the lowest position; S302. Hoist the installation base to the top of the Christmas tree maintenance pile, lower the installation base, and ensure that the guide pile hole of the base is embedded in the guide column of the Christmas tree maintenance pile to complete the connection; S4. Install the main body of the wellhead; Step S4 includes: S401. Lift and level the main body of the oil wellhead; S402. Place the entire tree body vertically onto the upper surface of the central disc of the mounting base; S5. Connection between the wellhead connector and the Christmas tree body. S501. By rotating the handle of the inner body rotating tool, rotate the lifting sleeve to lift the wellhead connector until the wellhead connector housing contacts the tree body of the production tree body; S502. Hover the wellhead connector, continue to rotate the lifting sleeve, and rotate the inner body of the wellhead connector so that the inner body of the wellhead connector is connected to the threaded connection of the tree body; S503. By rotating the housing tool, the wellhead connector housing is rotated so that the wellhead connector housing is connected to the tree body threaded connection; S504. Repeat step S502 to connect the inner body of the wellhead connector to the threaded connection of the tree body in place; S505. Repeat step S503 to connect the wellhead connector housing to the tree body threaded connection in place; S506. Install the limiting screws of the wellhead connector and the tree body, and then vertically lift out the oil production tree body and the wellhead connector to complete the assembly.

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