Oil and gas production system under seabed

Abstract

The invention discloses an oil and gas production system under a seabed, the oil and gas production system under the seabed comprises a first protective cylinder and a second protective cylinder, a Christmas tree is arranged in the second protective cylinder, a central manifold is arranged in the first protective cylinder, the second protective cylinder and the first protective cylinder are connected through a connecting groove structure, and the connecting groove structure is arranged in the connecting groove structure. A first pipe cable connected between the central manifold and the Christmas tree is arranged in the connecting groove structure; a first silt prevention structure is arranged on the first protective barrel, a second pipe cable of the central manifold is connected with the offshore platform through the first silt prevention structure, and a second silt prevention structure is arranged on the connecting groove structure to prevent silt from entering the first protective barrel or the second protective barrel. According to the oil and gas production system under the seabed, the first protection barrel and the second protection barrel are arranged on the seabed and used for arranging the central manifold and the Christmas tree connected with the central manifold, influence on a navigation area can be avoided, and damage caused by falling objects, falling anchors, fishing nets and the like is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of marine petroleum engineering, and in particular relates to an oil and gas production system under the seabed. Background Art

[0002] In marine oil and gas development, underwater production systems occupy a large area of ​​sea. With the development of marine engineering and the development and utilization of marine resources, the utilization rate of marine space resources is increasingly required to cope with oil and gas development in navigable areas and other restricted areas.

[0003] Existing underwater production systems have problems affecting navigation areas and restricted areas. In addition, underwater production systems can be damaged by fallen objects, anchors, fishing nets and other debris, affecting their use and increasing the design and maintenance costs of oil and gas development.

[0004] Therefore, it is urgent to design an oil and gas production system under the seabed to solve the above-mentioned problems. Summary of the Invention

[0005] In order to solve the technical problems mentioned in the background technology that the underwater production system affects the navigation area and restricted area, and is damaged by other debris such as fallen objects, dropped anchors and fishing nets, a subsea oil and gas production system is provided to solve the problem of underwater oil and gas production system layout.

[0006] To achieve the above objectives, the specific technical solutions of the subsea oil and gas production system of the present invention are as follows: A subsea oil and gas production system comprises a first protective cylinder and a second protective cylinder, wherein a Christmas tree is disposed in the second protective cylinder and a central manifold is disposed in the first protective cylinder, the second protective cylinder being connected to the first protective cylinder via a connecting groove structure so that a first pipe cable connecting the central manifold and the Christmas tree is arranged in the connecting groove structure; a first anti-siltation structure is provided on the first protective cylinder, a second pipe cable of the central manifold is connected to an offshore platform via the first anti-siltation structure, and a second anti-siltation structure is provided on the connecting groove structure to prevent silt from entering the first protective cylinder or the second protective cylinder.

[0007] Furthermore, a guide structure is provided on the inner wall of the first protective cylinder, and the central manifold is inserted into the first protective cylinder along the guide structure.

[0008] Furthermore, a support structure is provided on the inner wall of the first protective cylinder so that the insertion end of the central manifold abuts against the support structure.

[0009] Furthermore, a first protective cover is abutted on the first protective cylinder, and one end of the first protective cylinder away from the first protective cover is inserted into the seabed.

[0010] Furthermore, a first anti-siltation structure is provided between the first protective cylinder and the first protective cover, so that the second pipe cable of the central manifold is connected to the offshore platform through the first anti-siltation structure.

[0011] Furthermore, a second protective cover is abutted on the second protective cylinder, and an end of the second protective cylinder away from the second protective cover is inserted into the seabed.

[0012] Furthermore, a connecting groove structure is connected between the first protective cylinder and the first protective cover, and one end of the connecting groove structure away from the first protective cylinder is connected between the second protective cylinder and the second protective cover.

[0013] Furthermore, a second anti-silt structure is provided at both ends of the connecting groove structure to prevent silt from entering the first protective cylinder and the second protective cylinder.

[0014] Furthermore, the first protective cylinder and the second protective cylinder are both cylindrical structures with openings at both ends.

[0015] Furthermore, a pipe and cable protection structure is provided on the connection groove structure to protect the first pipe and cable.

[0016] The subsea oil and gas production system of the present invention has the following advantages: By installing a first and second protective cylinder on the seabed to house the central manifold and the Christmas tree connected to it, impacts on the navigation area are avoided, addressing damage caused by falling objects, dropped anchors, and fishing nets. The first and second anti-siltation structures prevent silt from entering and causing damage to the first and second protective cylinders. This application expands the space required for the underwater production system, reduces project costs, and improves the efficiency of project design. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic top view of the structure of the subsea oil and gas production system of the present invention; Figure 2 It is a side structural schematic diagram of the oil and gas production system under the seabed of the present invention.

[0018] Description of the marks in the figure: 1. First protective cylinder; 2. Second protective cylinder; 3. Central manifold; 4. Christmas tree; 5. Connection trough structure; 6. First umbilical cable; 7. Second umbilical cable; 8. First anti-siltation structure; 9. Second anti-siltation structure; 10. Guide structure; 11. Support structure; 12. First protective cover; 13. Second protective cover; 14. Umbilical cable protection structure; 15. Seabed surface. DETAILED DESCRIPTION

[0019] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] Those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is intended to be within the scope of the present invention and to form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0021] Please refer to the attached Figure 1 To the attached Figure 2 The subsea oil and gas production system of the present invention is described.

[0022] like Figure 1 As shown, the oil and gas production system under the seabed in the present invention includes a first protective cylinder 1 and a second protective cylinder 2, a Christmas tree 4 is arranged in the second protective cylinder 2, a central manifold 3 is arranged in the first protective cylinder 1, the second protective cylinder 2 and the first protective cylinder 1 are connected by a connecting groove structure 5, so that the first pipe cable 6 connecting the central manifold 3 and the Christmas tree 4 is arranged in the connecting groove structure 5; a first anti-siltation structure 8 is provided on the first protective cylinder 1, and the second pipe cable 7 of the central manifold 3 is connected to the offshore platform through the first anti-siltation structure 8, and a second anti-siltation structure 9 is provided on the connecting groove structure 5 to prevent silt from entering the first protective cylinder 1 or the second protective cylinder 2.

[0023] By installing first and second protective cylinders 1 and 2 on the seabed to house the central manifold 3 and the Christmas tree 4 connected to it, impacts on the navigation area are avoided, addressing damage caused by falling objects, dropped anchors, and fishing nets. First and second anti-siltation structures 8 and 9 are used to prevent silt from entering and causing damage to the first and second protective cylinders 1 and 2. This application expands the space required for the underwater production system, reduces project costs, and improves project design efficiency.

[0024] Further, if Figure 1 As shown, a guide structure 10 is provided on the inner wall of the first protective cylinder 1 , and the central manifold 3 is inserted into the first protective cylinder 1 along the guide structure 10 ; a support structure 11 is provided on the inner wall of the first protective cylinder 1 so that the insertion end of the central manifold 3 abuts against the support structure 11 .

[0025] A first protective cover 12 is abutted against the first protective cylinder 1, and the end of the first protective cylinder 1 away from the first protective cover 12 is inserted into the seabed; a first anti-siltation structure 8 is provided between the first protective cylinder 1 and the first protective cover 12, so that the second cable 7 of the central manifold 3 is connected to the offshore platform through the first anti-siltation structure 8.

[0026] In this embodiment, preferably, a guide structure 10 is connected to the inner wall of the first protective cylinder 1 along the length direction of the first protective cylinder 1, and the central manifold 3 is lifted and inserted into the interior of the first protective cylinder 1 along the guide structure 10, and the highest point of the central manifold 3 is ensured to be below the seabed surface 15.

[0027] A support structure 11 is fixedly connected to the inside of the first protective cylinder 1. The support structure 11 is located at one end of the guide structure 10, that is, away from the end where the central manifold 3 is inserted. When the central manifold 3 abuts against the support structure 11, the central manifold 3 is stably set in the first protective cylinder 1.

[0028] Preferably, the bottom end of the first protective cylinder 1 is inserted into the seabed. When the central manifold 3 is arranged in place inside the first protective cylinder 1, the first protective cover 12 is lifted and the first protective cover 12 is abutted against the first protective cylinder 1, thereby ensuring that the central manifold 3 in the first protective cylinder 1 is not damaged by falling objects, anchors and fishing nets.

[0029] A first connection port is provided on the first protective cylinder 1 , and a first anti-siltation structure 8 is provided on the first connection port. The second cable 7 connecting the central manifold 3 and the offshore platform is connected through the first anti-siltation structure 8 to prevent mud and sand from entering the first protective cylinder 1 through the first connection port and wearing the central manifold 3 .

[0030] Further, if Figure 1 and Figure 2 As shown, the second protective cylinder 1 is abutted with a second protective cover 13, and the second protective cylinder 2 is inserted into the seabed at one end away from the second protective cover 13; a connecting groove structure 5 is connected between the first protective cylinder 1 and the first protective cover 12, and the connecting groove structure 5 is connected between the second protective cylinder 2 and the second protective cover 13 at one end away from the first protective cylinder 1; second anti-siltation structures 9 are provided at both ends of the connecting groove structure 5 to prevent silt from entering the first protective cylinder 1 and the second protective cylinder 2.

[0031] In this embodiment, preferably, the second protective cylinder 2 is inserted into the seabed by hoisting, an oil production tree 4 is set in the second protective cylinder, and then the second protective cover 13 is abutted against the second protective cylinder 2 by hoisting, thereby ensuring that the oil production tree 4 in the second protective cylinder 2 is not damaged by falling objects, dropped anchors and fishing nets; the first protective cover 12 and the second protective cover 13 are flush with the seabed surface 15.

[0032] A second connection port is provided on the first protective cylinder body 1, and a connection groove structure 5 is connected to the second connection port. The connection groove structure 5 is connected to the third connection port of the second protective cylinder body 2 at one end away from the first protective cylinder body 1, so that the first pipe cable 6 connecting the central manifold 3 and the oil production tree 4 is connected through the connection groove structure 5.

[0033] Preferably, both ends of the connecting groove structure 5 are connected to the first protective cylinder 1 and the second protective cylinder 2 through the second anti-silt structure 9 , thereby preventing silt from entering the first protective cylinder 1 and the second protective cylinder 2 .

[0034] As a preferred embodiment, a plurality of second connection ports may be opened on the first protective cylinder body 1, and each of the plurality of second connection ports is connected to a connection groove structure 5, and the plurality of connection groove structures 5 are respectively connected to the second protective cylinder body 2, thereby enabling the oil production trees 4 in the plurality of second protective cylinder bodies 2 to be connected to the central manifold 3.

[0035] Further, if Figure 1 As shown, the first protective cylinder 1 and the second protective cylinder 2 are both cylindrical structures with openings at both ends; preferably, a pipe and cable protection structure 14 is provided on the outer wall of the connecting groove structure 5 to further protect the first pipe and cable 6.

[0036] The construction steps of the oil and gas production system under the seabed of this application are as follows: First, the first protective cylinder 1 and the second protective cylinder 2 are sunk into a predetermined position below the seabed by driving or vibrating; Then, the soil between the first protective cylinder 1 and each second protective cylinder 2 is removed, and the connecting groove structure 5 is connected; Then, the central manifold 3 is hoisted, and the guide structure 10 is used to connect the central manifold 3 with the first protective cylinder 1 and lower it to the support structure 11; Then, after drilling is completed in the second protective cylinder 2, the Christmas tree 4 is installed; Then, the first umbilical cable 6 is connected between the central manifold 3 and the Christmas tree 4, and the first umbilical cable 6 passes through the second anti-siltation structure 9; Then, the second umbilical cable 7 is connected between the central manifold 3 and the offshore platform, and the second umbilical cable 7 passes through the first anti-siltation structure 8; Then, the first protective cover 12 and the second protective cover 13 are lifted and placed on the first protective cylinder 1 and the second protective cylinder 2 respectively; Finally, the pipe and cable protection structure 14 is connected to the connection groove structure 5, and the overall installation work is completed.

[0037] The subsea oil and gas production system, based on the installation of a first and second protective cylinders 1 and 2 on the seabed for arranging a central manifold 3 and a Christmas tree 4 connected thereto, can avoid impacts on the navigable area and address damage caused by falling objects, dropped anchors, and fishing nets. The first and second anti-siltation structures 8 and 9 are utilized to prevent silt from entering the first and second protective cylinders 1 and 2 and causing damage. This application expands the space required for the subsea production system, reduces project costs, and improves project design efficiency.

[0038] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A subsea oil and gas production system, characterized in that: The first protective cylinder comprises a first protective cylinder and a second protective cylinder, wherein a Christmas tree is arranged in the second protective cylinder, and a central manifold is arranged in the first protective cylinder. The second protective cylinder is connected to the first protective cylinder via a connecting groove structure, so that a first pipe cable connecting the central manifold and the Christmas tree is arranged in the connecting groove structure. A first anti-siltation structure is provided on the first protective cylinder, and the second cable of the central manifold is connected to the offshore platform through the first anti-siltation structure. A second anti-siltation structure is provided on the connecting groove structure to prevent silt from entering the first protective cylinder or the second protective cylinder.

2. The subsea oil and gas production system according to claim 1, characterized in that: A guide structure is provided on the inner wall of the first protective cylinder, and the central manifold is inserted into the first protective cylinder along the guide structure.

3. The subsea oil and gas production system according to claim 2, characterized in that: A supporting structure is provided on the inner wall of the first protective cylinder so that the insertion end of the central manifold abuts against the supporting structure.

4. The oil and gas production system under the seabed according to claim 1, characterized in that: The first protective cylinder is in contact with a first protective cover, and one end of the first protective cylinder away from the first protective cover is inserted into the seabed.

5. The subsea oil and gas production system according to claim 4, characterized in that: A first anti-siltation structure is provided between the first protective cylinder and the first protective cover, so that the second pipe cable of the central manifold is connected to the offshore platform through the first anti-siltation structure.

6. The subsea oil and gas production system according to claim 1, characterized in that: The second protective cylinder is in contact with a second protective cover, and one end of the second protective cylinder away from the second protective cover is inserted into the seabed.

7. The subsea oil and gas production system according to claim 5, characterized in that: A connecting groove structure is connected between the first protective cylinder and the first protective cover. One end of the connecting groove structure away from the first protective cylinder is connected between the second protective cylinder and the second protective cover.

8. The subsea oil and gas production system according to claim 7, characterized in that: A second anti-silt structure is provided at both ends of the connecting groove structure to prevent silt from entering the first protective cylinder and the second protective cylinder.

9. The subsea oil and gas production system according to claim 1, characterized in that: The first protective cylinder and the second protective cylinder are both cylindrical structures with openings at both ends.

10. The subsea oil and gas production system according to claim 1, wherein: A pipe and cable protection structure is provided on the connection groove structure to protect the first pipe and cable.

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