Integrated wellhead shallow water subsea integrated terminal

Abstract

This invention relates to a shallow-water subsea integrated terminal for an integrated wellhead, comprising a support frame, a guide base, a production pipeline system, and a control unit. The support frame is a double-layer structure, with a top plate and an anti-sinking plate respectively installed around the perimeter of the top and bottom layers. Pile foundation columns are distributed at the four corners of the support frame for driving steel piles. The guide base is located in the central area of ​​the support frame. The Christmas tree is installed on the guide base. The production pipeline system is installed on the anti-sinking plate and connected to the oil outlet pipe of the Christmas tree. The control unit is located at both ends of the support frame. The umbilical cable terminal is installed at one end of the support frame via an umbilical cable terminal support. The highly integrated design of the terminal integrates the guide base, Christmas tree, control unit, production pipeline system, and anti-fishing net structure onto a single anti-sinking plate, replacing the traditional dispersed layout, significantly reducing the underwater footprint and the number of independent protective structures, and directly lowering engineering costs.

Description

Technical Field

[0001] This invention belongs to the field of offshore oil and gas field development equipment technology, specifically relating to a shallow-water subsea integrated terminal for an integrated wellhead. Background Technology

[0002] Currently, the development model for shallow-water subsea applications mainly involves cluster manifold layouts. Due to the dispersed nature of subsea facilities, crossovers, electrical fly-throughs, and hydraulic fly-throughs are required to connect the subsea production trees and subsea manifolds. Furthermore, the prevalence of fishing and maritime operations in the Bohai Sea region results in a greater number of subsea structural foundations and protective devices, increasing the workload and costs of offshore installation.

[0003] The international standard API 17D specifies the design requirements for subsea production systems, but it does not provide optimized design structures for subsea base plate manifolds for special operating conditions such as frequent surges in shallow water and the need for fishing net protection. Existing subsea cluster manifold structures often lack integrated wellheads and Christmas trees, requiring separate installation of crossovers. Furthermore, the manifold lacks an integrated control system, and electro-hydraulic flywires also require separate installation, resulting in high overall installation costs. These issues also prevent the successful installation and protection of crossovers to the Christmas tree, and hinder the control of the Christmas tree's umbilical cables and flywires. Summary of the Invention

[0004] To address at least one of the problems in the prior art, the present invention aims to provide a shallow-water subsea integrated terminal with an integrated wellhead. This addresses the issues of existing subsea manifold structures lacking integrated wellheads and Christmas trees, requiring separate installation of crossover pipes, lacking integrated control systems, and necessitating separate installation of electro-hydraulic flywires, resulting in high overall installation costs and difficulties in controlling the installation and protection of the Christmas tree's umbilical cable and flywires. The present invention constitutes an integrated device suitable for subsea production systems in shallow waters. As a subsea integrated terminal that integrates the wellhead guide base, production pipeline system, and control unit, it simplifies subsea wellhead installation, improves oil and gas extraction efficiency in shallow water areas, and reduces engineering costs.

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

[0006] A shallow-water subsea integrated terminal for an integrated wellhead, characterized in that it comprises: The support frame is configured as a double-layer structure, with a top plate and an anti-sinking plate respectively provided around the top and bottom layers of the support frame. The pile foundation columns are distributed at the four corners of the support frame and are used to drive steel piles into the piles. A guide base is disposed in the central region of the support frame; The wellhead is installed on the guide base; The production pipeline system is installed on the anti-sinking plate and connected to the oil outlet pipe of the wellhead. Control units are respectively located at both ends of the support frame; The umbilical cable terminal is mounted on one end of the support frame via an umbilical cable terminal support seat and is used for external connection of the umbilical cable.

[0007] Preferably, the support frame is composed of multiple main beams and columns welded together.

[0008] Preferably, the central area of ​​the support frame is divided into multiple guide base installation wellheads by multiple main beams.

[0009] Preferably, each of the guide bases is installed inside the guide base mounting wellhead.

[0010] Preferably, the guide base includes a guide base tube and a connecting seat. The connecting seat is sleeved and connected to the outer wall of the guide base tube. The connecting seat includes an upper connecting plate and a lower connecting plate. A stiffening plate connects the upper connecting plate and the lower connecting plate. Both the upper connecting plate and the lower connecting plate are provided with four connecting end faces. The four connecting end faces are respectively connected to the main beams around the guide base mounting well opening.

[0011] Preferably, skirts are provided at both ends of the bottom of the support frame.

[0012] Preferably, the pile foundation column is a hollow circular tube, and the steel pile is driven into the ground through the pile foundation column and connected to the pile foundation column.

[0013] Preferably, it also includes an anti-fishing net, which is fastened above the support frame. The anti-fishing net includes an anti-fishing net frame composed of multiple circular columns welded together. A steel plate is welded onto the anti-fishing net frame to form a protective cover. The top and sides of the anti-fishing net are provided with multiple openable top covers and side covers.

[0014] Preferably, the anti-fishing net has internal support columns, which are connected to the pile foundation columns.

[0015] Preferably, the circular column in the anti-fishing net frame that contacts the seabed has a mud-inserting plate at its bottom.

[0016] The present invention has the following advantages due to the adoption of the above technical solutions: 1. The shallow water subsea integrated terminal for integrated wellheads provided by this invention features a highly integrated design that integrates the guide base, production tree, control unit, production pipeline system, and anti-fishing net structure onto a single anti-sinking plate, replacing the traditional dispersed layout. This significantly reduces the underwater footprint and the number of independent protective structures, directly lowering engineering costs.

[0017] 2. The shallow water subsea integrated terminal for the integrated wellhead provided by this invention has a guide base that is precisely welded to the support frame at four points to ensure the installation accuracy of the Christmas tree and to enable rapid connection between the oil pipe and the pipeline system; the pre-installation on land reduces the number of underwater connections by 50% and saves 50% of the installation time; the control unit is integrated into the two ends of the terminal in a skid-like manner, enabling one control unit to control two Christmas trees, saving 50% of the number of control units and costs. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of a shallow water submersible integrated terminal for an integrated wellhead provided in an embodiment of the present invention.

[0019] Figure 2 This is a top view schematic diagram of the shallow water submersible integrated terminal for the integrated wellhead provided in this embodiment of the present invention.

[0020] Figure 3 This is a front view schematic diagram of the shallow water submersible integrated terminal for the integrated wellhead provided in this embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the shallow water underwater integrated terminal of the integrated wellhead provided in this embodiment of the present invention from a bottom-up perspective.

[0022] Figure 5 This is a schematic diagram of a shallow-water subsea integrated terminal for installing an oil production tree at the integrated wellhead provided in this embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the structure of the guide base provided in this embodiment of the present invention.

[0024] Figure 7 This is a front view schematic diagram of a shallow water underwater integrated terminal for installing an anti-fishing net at an integrated wellhead provided in this embodiment of the present invention.

[0025] Figure 8 This is a three-dimensional schematic diagram of a shallow-water underwater integrated terminal for installing anti-fishing nets at an integrated wellhead, provided in this embodiment of the present invention.

[0026] Figure 9 This is a top view schematic diagram of the anti-fishing net provided in this embodiment of the present invention.

[0027] Figure 10 This is a schematic diagram of the anti-fishing net provided in this embodiment of the present invention from a downward angle.

[0028] Marked in the attached diagram: 1. First main beam, 2. Second main beam, 3. Third main beam, 4. Guide base, 401. Guide base pipe, 402. Connecting seat, 5. Pile foundation column, 6. Lifting lug, 7. Control unit, 8. Anti-sinking plate, 9. Skirt plate, 10. Main column, 11. Top plate, 12. Production pipeline system, 13. Umbilical cable terminal, 14. Umbilical cable terminal support seat, 15. Wellhead tree, 16. Oil outlet pipe, 17. Circular column, 18. Steel plate, 19. Top cover, 20. Side cover, 21. Lifting ring, 22. Fishing net reinforcing rib, 23. Support column, 24. Mud insert plate, 25. Steel pile. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0030] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 this invention. The arrow direction in the figure represents the direction of liquid flow.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "assembly," "setup," and "connection" 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.

[0032] This invention provides a shallow-water subsea integrated terminal with an integrated wellhead. As a subsea integrated terminal that integrates a guide base, a wellhead, a production pipeline system, and a control unit, it is suitable for simplifying the installation of subsea wellheads, improving the efficiency of oil and gas extraction in shallow water areas, and reducing engineering costs.

[0033] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0034] Example Please refer to the reference. Figures 1 to 10This embodiment provides a shallow water submersible integrated terminal for an integrated wellhead, including a support frame, a guide base 4, a production pipeline system 12, and a control unit 7; The support frame is set as a double-layer structure, with a top plate 11 and an anti-sinking plate 8 respectively installed around the top and bottom layers of the support frame. The pile foundation columns 5 are distributed at the four corners of the support frame and are used to drive in steel piles 25; Guide base 4 is located in the central area of ​​the support frame; The Christmas tree 15 is installed on the guide base 4; The production pipeline system 12 is installed on the anti-sinking plate 8 and connected to the oil outlet pipe of the wellhead 15; Control units 7 are respectively located at both ends of the support frame; The umbilical cable terminal 13 is mounted on one end of the support frame via the umbilical cable terminal support 14 for connecting an external umbilical cable.

[0035] Specifically, the support frame is composed of multiple main beams and columns welded together. The main beams include a first main beam 1, a second main beam 2, a third main beam 3, and main columns 10, all of which are made of H-beams and are welded together to form the support frame structure for the production integrated terminal; the upper and lower main beams are connected by multiple main columns 10, making it a double-layer frame structure.

[0036] In this embodiment, the anti-sinking plate 8 and the top plate 11 are square steel grating plates, and the anti-sinking plate 8 and the top plate 11 are located on the surrounding supporting structure; this facilitates the installation of other equipment and allows personnel to stand and walk.

[0037] In this embodiment, skirts 9 are provided at both ends of the bottom of the support frame.

[0038] Specifically, the skirt plate 9 is welded to the bottom of the support frame. Both ends of the skirt plate 9 are U-shaped, with the notches facing inwards. The sides of the skirt plate 9 are closed and connected. During installation, the skirt plate 9 extends deep below the mud surface to grip the mud for load-bearing. The anti-sinking plate 8, the skirt plate 9, and the steel piles 25 constitute the basic support structure of the support frame, which bears the total load of the underwater integrated terminal.

[0039] In this embodiment, the central area of ​​the support frame is divided into multiple guide base installation wellheads by multiple main beams.

[0040] Specifically, the guide base installation well opening is square, which facilitates the installation of the guide base 4 inside the guide base installation well opening.

[0041] In this embodiment, the guide base 4 includes a guide base tube 401 and a connecting seat 402. The connecting seat 402 is sleeved and connected to the outer wall of the guide base tube 401. The connecting seat 402 includes an upper connecting plate and a lower connecting plate. A stiffening plate is connected between the upper connecting plate and the lower connecting plate. Both the upper connecting plate and the lower connecting plate are provided with four connecting end faces. The four connecting end faces are respectively connected to the main beams around the guide base mounting well opening.

[0042] Specifically, the guide base tube 401 and the connecting seat 402 are connected by welding. The four extended end faces of the connecting seat 402 are welded to the main beam of the support frame, which can realize the precise positional connection between the guide base 4 and the guide base installation wellhead.

[0043] In this embodiment, the lower end of the wellhead 15 extends into the guide base tube 401. The top end of the guide base tube 401 is an open conical opening that fits into a groove at the bottom of the wellhead 15, ensuring accurate positioning of the connection and enabling rapid installation. After the wellhead 15 is installed on the guide base 4, the oil outlet pipe 16 on the wellhead 15 is connected to the production pipeline system 12, enabling the flow of production materials. The production pipeline system 12 includes branch pipes, elbows, gate valves, and flanges connected to the oil outlet pipe 16.

[0044] In this embodiment, the pile foundation column 5 is set as a hollow circular tube, and the steel pile 25 is driven into the ground through the pile foundation column 5 and connected to the pile foundation column 5 to realize the overall connection between the steel pile 25 and the support frame.

[0045] In this embodiment, each pile column 5 is welded with a lifting lug 6, which can be used to lift the entire support frame.

[0046] In this embodiment, the control unit 7 is arranged as a separate skid at the front and rear ends of the support frame, and is connected to the wellhead 15 via cables to control the wellhead 15. The control unit 7 is also connected to the umbilical cable terminal 13 via cables, thereby enabling external connectivity.

[0047] In this embodiment, the production pipeline system 12 is supported by the anti-sinking plate 8 structure and installed between the anti-sinking plate 8 and the top plate 11.

[0048] The shallow-water subsea integrated terminal of the integrated wellhead in this embodiment also includes an anti-fishing net, which is fastened above the support frame to protect the integrated terminal and prevent marine organisms from damaging components such as the wellhead 15, control unit 7, and production pipeline system 12 inside.

[0049] In this embodiment, the anti-fishing net includes an anti-fishing net frame composed of multiple circular columns 17 welded together. The circular columns 17, which serve as the main support columns of the anti-fishing net frame, are made of circular steel and are connected to each other by welding to form the anti-fishing net frame. Multiple steel plates 18 are welded onto the anti-fishing net frame to form a protective cover.

[0050] In this embodiment, the top and sides of the fishing net are provided with multiple openable top covers 19 and side covers 20.

[0051] Specifically, the top cover 19 and the side cover 20 can be movably installed on the top and sides of the fishing net. The top cover 19 and the side cover 20 are equivalent to skylights. The top cover 19 and the side cover 20 can be connected to the fishing net frame by pins. Divers can open the top cover 19 and the side cover 20 for underwater well repair and maintenance of manifold components.

[0052] In this embodiment, multiple reinforcing ribs 22 are provided at the four corners of the anti-fishing net, specifically five ribs, which are used for multiple circular posts 17 on the top and sides of the anti-fishing net to increase the overall strength of the anti-fishing net structure.

[0053] In this embodiment, the interior of the anti-fishing net is provided with a support column 23. The end of the support column 23 is a flared opening, which can be connected to the pile foundation column 5. The connection between the anti-fishing net and the support frame is realized through the connection between the support column 23 and the pile foundation column 5.

[0054] In this embodiment, the circular column 17 in the anti-fishing net frame that contacts the seabed has a mud-inserting plate 24 at its bottom end.

[0055] Specifically, the mud-insertion plate 24 is a triangular steel plate, which is easy to insert into the seabed mud surface to fix the fishing net.

[0056] In this embodiment, lifting rings 21 are provided at the four corners of the top of the anti-fishing net, and the entire anti-fishing net can be hoisted through the lifting rings 21.

[0057] The installation method of the shallow water submersible integrated terminal for the integrated wellhead in this embodiment includes the following steps: Step 1: [The following text appears to be a separate, unrelated section:] ... Figure 1 The underwater integrated terminal shown is installed on the underwater mud surface; Step 2: Drive rigid piles 25 into the pile foundation column 5 to fix the underwater integrated terminal; Step 3: Install the oil wellhead, such as... Figure 5 As shown, it is connected to the guide base 4; Step 4: Install fishing nets, such as Figure 7 As shown.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A shallow-water submersible integrated terminal for integrating wellheads, characterized in that, include: The support frame is configured as a double-layer structure, with a top plate and an anti-sinking plate respectively provided around the top and bottom layers of the support frame. The pile foundation columns are distributed at the four corners of the support frame and are used to drive steel piles into the piles. A guide base is disposed in the central region of the support frame; The wellhead is installed on the guide base; The production pipeline system is installed on the anti-sinking plate and connected to the oil outlet pipe of the wellhead. Control units are respectively located at both ends of the support frame; The umbilical cable terminal is mounted on one end of the support frame via an umbilical cable terminal support seat and is used for external connection of the umbilical cable.

2. The shallow water submersible integrated terminal for the integrated wellhead according to claim 1, characterized in that, The support frame is composed of multiple main beams and columns welded together.

3. The shallow-water submersible integrated terminal for the integrated wellhead according to claim 2, characterized in that, The central area of ​​the support frame is divided into multiple guide base installation wellheads by multiple main beams.

4. The shallow-water submersible integrated terminal for the integrated wellhead according to claim 3, characterized in that, Each of the guide bases is installed inside the guide base mounting wellhead.

5. The shallow-water submersible integrated terminal for the integrated wellhead according to claim 4, characterized in that, The guide base includes a guide base tube and a connecting seat. The connecting seat is sleeved on the outer wall of the guide base tube. The connecting seat includes an upper connecting plate and a lower connecting plate. A stiffening plate connects the upper connecting plate and the lower connecting plate. Both the upper connecting plate and the lower connecting plate are provided with four connecting end faces. The four connecting end faces are respectively connected to the main beams around the wellhead of the guide base.

6. The shallow-water submersible integrated terminal for the integrated wellhead according to claim 1, characterized in that, Skirts are provided at both ends of the bottom of the support frame.

7. The shallow-water submersible integrated terminal for the integrated wellhead according to claim 1, characterized in that, The pile foundation column is a hollow circular tube, and the steel pile is driven into the ground through the pile foundation column and connected to the pile foundation column.

8. The shallow-water submersible integrated terminal for the integrated wellhead according to claim 1, characterized in that, It also includes a fishing net, which is fastened above the support frame. The fishing net includes a fishing net frame composed of multiple circular columns welded together. A steel plate is welded onto the fishing net frame to form a protective cover. The top and sides of the fishing net are provided with multiple openable top covers and side covers.

9. The shallow-water submersible integrated terminal for the integrated wellhead according to claim 8, characterized in that, The fishing net is equipped with internal support columns, which are connected to the pile foundation columns.

10. The shallow-water submersible integrated terminal for the integrated wellhead according to claim 8, characterized in that, The circular column in the anti-fishing net frame that contacts the seabed has a mud-inserting plate at its bottom.

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