An underwater pressure boosting system with strong adaptability

Abstract

This invention discloses a highly adaptive subsea pressurization system, comprising a first manifold, a subsea pressurization device, and a second manifold. The first manifold includes a first main pipe and a second main pipe, one end of which is connected to each other. Several first connecting pipes are arranged in parallel between the first and second main pipes. The inlet of the subsea pressurization device is connected to the other end of the second main pipe. A bypass pipe is provided between the inlet and outlet of the subsea pressurization device. Valves are respectively installed on the inlet and bypass pipe of the subsea pressurization device. The second manifold includes a third main pipe and a fourth main pipe, one end of which is connected to each other. The other ends of the third and fourth main pipes are respectively connected to a shallow water treatment platform. Several second connecting pipes are arranged in parallel between the third and fourth main pipes. Compared with the prior art, this invention can achieve rational utilization of natural energy and reduce the number of subsea pressurization devices required, fully utilize the capacity of the pressurization devices, and maximize the recovery rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas development, and particularly relates to a strong self-adaptive underwater booster system. BACKGROUND

[0002] The gas field developed in the mode of underwater long-distance tie-in mainly uses the natural energy of the formation to naturally lift the oil and gas products in the early production stage. In the middle and late stages, as the formation energy declines, the production will gradually decrease, and the natural pressure cannot transport the natural gas to the production and processing platform. In order to further improve the recovery rate, an underwater booster device can be installed. The underwater booster device is an important underwater equipment for improving the recovery rate, which can prolong the production time limit of the gas field and increase the recoverable reserves.

[0003] For the gas field with multiple production wells, due to the different reservoir characteristics of each gas well, the wellhead pressures of each gas field are different in the same period, the wellhead pressure of part of the wells decays fast, and the pressure decay of part of the wells is relatively slow. In the whole life cycle, the natural energy of each gas well needs to be reasonably and fully utilized to reduce the energy consumption of the booster, reduce carbon emissions, reduce the number of compressor configurations, reduce the investment of underwater facilities, maximize the use of the capacity of the compressor for low-pressure well booster, and improve the recovery rate.

[0004] In the prior art, the booster device in the oil and gas field industry is mainly installed on the platform or land. The underwater booster device is usually installed after all wells are combined, and then the pressure is uniformly boosted, which causes the energy waste of high-pressure wells and the increase in the scale of the compressor. SUMMARY

[0005] The present application aims at the above-mentioned problems in the prior art, and provides a strong self-adaptive underwater booster system, which can fully utilize the different annual production gas and pressure characteristics of each gas well by adjusting the configuration of the pipeline and the valve, flexibly adjust the operation strategy, reasonably utilize the natural energy, reduce the number of configurations of the underwater booster device, fully utilize the capacity of the booster device, and maximize the improvement of the recovery rate.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0007] A strong self-adaptive underwater booster system, characterized in that it comprises:

[0008] A first manifold, the first manifold comprises a first main pipe and a second main pipe, one end of the first main pipe and the second main pipe is connected to each other, the first main pipe and the second main pipe are respectively provided with a valve at two ends, and a plurality of first connecting pipes are arranged in parallel between the first main pipe and the second main pipe. Each first connecting pipe is connected to one production well, and the production well connected by each first connecting pipe can selectively communicate with the first main pipe or the second main pipe.

[0009] An underwater pressurization device, wherein the inlet of the underwater pressurization device is connected to the other end of the second main pipe, a bypass pipe is provided between the inlet and outlet of the underwater pressurization device, and valves are respectively provided on the inlet of the underwater pressurization device and the bypass pipe;

[0010] The second manifold includes a third main pipe and a fourth main pipe, with one end of the third main pipe and the fourth main pipe connected to each other. The other ends of the third main pipe and the fourth main pipe are respectively connected to a shallow water treatment platform. There are several second connecting pipes arranged in parallel between the third main pipe and the fourth main pipe. One of the second connecting pipes is connected to the first main pipe, another second connecting pipe is connected to the outlet of the underwater pressurization device, and the remaining second connecting pipes are respectively connected to a production well. The first main pipe, the outlet of the underwater pressurization device, and the production well connected to each of the second connecting pipes can be selectively connected to the third main pipe or the fourth main pipe.

[0011] Preferably, one end of the first main pipe and the second main pipe are connected to each other via a U-shaped connector.

[0012] Preferably, valves are provided at both ends of the first connecting pipe.

[0013] Preferably, one end of the third main pipe and the fourth main pipe are connected to each other via a U-shaped connector.

[0014] Preferably, valves are provided at both ends of the second connecting pipe.

[0015] Preferably, there are three first connecting pipes arranged in parallel between the first main pipe and the second main pipe, and three second connecting pipes arranged in parallel between the third main pipe and the fourth main pipe.

[0016] Preferably, the underwater pressurization device is an underwater compressor.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] This invention targets deepwater gas fields developed through multiple manifold connections. It installs a subsea booster device between the manifolds. During use, while ensuring safe and minimum flow rate, it can fully utilize the gas production and pressure characteristics of each well in different years through flexible allocation of connecting pipes and valves. This reduces the amount of compressed gas required by the compressor, thereby achieving rational utilization of natural energy and reducing the number of subsea booster devices required. It fully utilizes the capacity of the booster devices to maximize the recovery rate of each well. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. It should be noted that in all the drawings, the elements or parts are not necessarily drawn to actual scale.

[0020] Figure 1 This is a schematic diagram of the overall structure of the highly adaptive underwater pressurization system described in this embodiment of the invention.

[0021] In the picture:

[0022] 1. First manifold; 11. First main pipe; 12. Second main pipe; 13. First connecting pipe; 2. Subsea pressurization device; 21. Bypass pipe; 3. Second manifold; 31. Third main pipe; 32. Fourth main pipe; 33. Second connecting pipe; 4. Production well; 5. Shallow water treatment platform; 6. First subsea pipeline; 7. Second subsea pipeline; 8. Third subsea pipeline; 9. Fourth subsea pipeline. Detailed Implementation

[0023] 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.

[0024] In the description of this invention, it should be noted that the terms "upper," "lower," "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 component 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," etc., used to define components are merely for the convenience of distinguishing the aforementioned components. Unless otherwise stated, these terms have no special meaning and should not be construed as indicating or implying relative importance.

[0025] 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.

[0026] In existing technologies, subsea booster units in the oil and gas field industry are mainly installed on platforms or on land. Subsea booster units are typically installed after all wells have been combined, resulting in energy waste in high-pressure wells and an increased size of compressors. Therefore, this invention provides a highly adaptive subsea booster system that, through adjustments to pipeline and valve configurations, can fully utilize the different gas production volumes and pressure characteristics of each well in different years, flexibly adjusting operating strategies to achieve rational utilization of natural energy, reduce the number of subsea booster units required, fully utilize the booster unit's capacity, and maximize oil recovery.

[0027] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0028] like Figure 1 As shown, this embodiment of the invention provides a highly adaptive underwater pressurization system, comprising:

[0029] The first manifold 1 includes a first main pipe 11 and a second main pipe 12. One end of the first main pipe 11 and the second main pipe 12 are connected to each other through a U-shaped connector. Valves are respectively provided at both ends of the first main pipe 11 and the second main pipe 12. There are several first connecting pipes 13 arranged in parallel between the first main pipe 11 and the second main pipe 12. Each first connecting pipe 13 is connected to a production well 4. The production well 4 connected to each first connecting pipe 13 can be selectively connected to the first main pipe 11 or the second main pipe 12.

[0030] The underwater pressurization device 2 has its inlet connected to the other end of the second main pipe 12 via the first subsea pipe 6. A bypass pipe 21 is provided between the inlet and outlet of the underwater pressurization device 2, and valves are respectively provided on the inlet and bypass pipe 21 of the underwater pressurization device 2.

[0031] The second manifold 3 includes a third main pipe 31 and a fourth main pipe 32. One end of the third main pipe 31 and the fourth main pipe 32 are connected to each other. There are several second connecting pipes 33 arranged in parallel between the third main pipe 31 and the fourth main pipe 32. One of the second connecting pipes 33 is connected to the first main pipe 11 through the second subsea pipe 7. Another second connecting pipe 33 is connected to the outlet of the subsea booster device 2 through the jumper pipe. The remaining second connecting pipes 33 are respectively connected to a production well 4. The first main pipe 11, the outlet of the subsea booster device 2 and the production well 4 connected to each second connecting pipe 33 can be selectively connected to the third main pipe 31 or the fourth main pipe 32. The other end of the third main pipe 31 and the fourth main pipe 32 are connected to the shallow water treatment platform 5 through the third subsea pipe 8 and the fourth subsea pipe 9, respectively.

[0032] Furthermore, valves are respectively provided at both ends of the first connecting pipe 13. In this embodiment, the oil and gas produced by the production well 4 connected to each connecting pipe can be selectively input into the first main pipe 11 or the second main pipe 12 by controlling the valves at both ends of each first connecting pipe 13. For example, when it is necessary to input the oil and gas produced by a certain production well 4 into the first main pipe 11, the valve on the first connecting pipe 13 corresponding to that production well 4 near the first main pipe 11 can be opened and the valve near the second main pipe 12 can be closed, thereby allowing the oil and gas produced by that production well 4 to be input into the first main pipe 11; conversely, when it is necessary to input the oil and gas produced by a certain production well 4 into the second main pipe 12, the valve on the first connecting pipe 13 corresponding to that production well 4 near the second main pipe 12 can be opened and the valve near the first main pipe 11 can be closed, thereby allowing the oil and gas produced by that production well 4 to be input into the second main pipe 12.

[0033] It is understood that the present invention is not limited to the method described above, which allows each production well 4 connected to the first connecting pipe 13 to selectively connect to the first main pipe 11 or the second main pipe 12. In other embodiments, other methods may also be used to achieve the same connection. For example, in some optional embodiments, the production well 4 connected to the first connecting pipe 13 can be selectively connected to the first main pipe 11 or the second main pipe 12 by providing a switching valve on the first connecting pipe 13.

[0034] Furthermore, valves are installed at both ends of the second connecting pipe 33.

[0035] In this embodiment, valves are provided at both ends of the second connecting pipe 33. During use, the valves at both ends of the second connecting pipe 33 can be controlled to selectively connect it to the third main pipe 31 or the fourth main pipe 32, thereby enabling the first main pipe 11, the outlet of the underwater pressurization device 2, and the production well 4 connected to each second connecting pipe 33 to selectively connect to the third main pipe 31 or the fourth main pipe 32.

[0036] Specifically, when it is necessary for the second connecting pipe 33 to connect with the third main pipe 31, the valve of the second connecting pipe 33 near the third main pipe 31 can be opened and the valve above it near the fourth main pipe 32 can be closed; when it is necessary for the second connecting pipe 33 to connect with the fourth main pipe 32, the valve of the second connecting pipe 33 near the fourth main pipe 32 can be opened and the valve above it near the third main pipe 31 can be closed.

[0037] Of course, the present invention is not limited to the selective connection of the first main pipe 11, the outlet of the underwater pressurization device 2, and the production well 4 connected to each second connecting pipe 33 to the third main pipe 31 or the fourth main pipe 32 by setting valves at both ends of the second connecting pipe 33. In other embodiments, the selective connection of the first main pipe 11, the outlet of the underwater pressurization device 2, and the production well 4 connected to each second connecting pipe 33 to the third main pipe 31 or the fourth main pipe 32 can also be achieved in other ways. For example, in some optional embodiments, a switching valve that can be connected to the first main pipe 11, the outlet of the underwater pressurization device 2, or the production well 4 can be provided on the second connecting pipe 33. In use, the switching valves on each second connecting pipe 33 can be controlled to selectively connect the first main pipe 11, the outlet of the underwater pressurization device 2, and the production well 4 connected to each second connecting pipe 33 to the third main pipe 31 or the fourth main pipe 32.

[0038] Furthermore, the underwater pressurization device 2 in this embodiment includes a general pressurization device such as an underwater compressor or a pressurization pump.

[0039] It should be noted that the number of first connecting pipes 13 of the first manifold 1 and the number of second connecting pipes 33 of the second manifold 3 can be set according to actual needs, and this embodiment does not impose any restrictions on this.

[0040] Below, this embodiment will further describe the operating conditions of this embodiment using the example of a first connecting pipe 13 with three parallel connections between the first main pipe 11 and the second main pipe 12, and a second connecting pipe 33 with three parallel connections between the third main pipe 31 and the fourth main pipe 32.

[0041] Specifically, in this embodiment, the first manifold 1 connects to three wells, and the second manifold 3 connects to one high-yield well. Among them, the production wells 4 connected to the first manifold 1 are quite diverse, with some wells experiencing rapid pressure decay after development, while others experience relatively slower pressure decay.

[0042] Because the distance between the second manifold 3 and the shallow water platform is long and the elevation difference is large, as the gas field production gradually decreases, the gas-carrying capacity of the pipeline will decrease accordingly, resulting in a larger amount of stagnant liquid in the pipeline. The pressure drop on the pipeline will change from being dominated by friction loss to being dominated by hydrostatic pressure loss. The pipeline inlet pressure will increase after it is lower than a certain flow rate, and this will cause instability in the production of the subsea production system. In order to ensure the safety of the pipeline flow, under the platform pressure P1, there is a minimum flow rate limit Q1 for the pipeline.

[0043] Assuming the gas production rate of production well 4 connected to the first manifold 1 is Q2, and the gas production rate of production well 4 connected to the second manifold 3 is Q3, in the entire subsea gas field production process, based on the pressure and gas production rate of each production well 4, this embodiment can be divided into the following operating conditions:

[0044] (1) In the early stage of gas field production, Q2+Q3 is greater than twice Q1, and the pressure of each well is sufficient, so there is no need for underwater pressurization: Under this condition, the third subsea pipeline 8 and the fourth subsea pipeline 9 between the second manifold 3 and the shallow water treatment platform 5 operate simultaneously to reduce the gas transmission volume of a single subsea pipeline and reduce the pipeline transmission pressure drop; by controlling the valves at both ends of the first connecting pipe 13 on the first manifold 1, the gas volume input to the first main pipe 11 or the second main pipe 12 of different production wells 4 is adjusted to ensure that the gas transmission volume Q2a of the first subsea pipeline 6 is greater than Q1, and the gas transmission volume Q2b of the second subsea pipeline 7 and the production volume Q3 of the second manifold 3 are greater than Q1.

[0045] Specifically, open the valve on the second connecting pipe 33 connected to the first subsea pipeline 6 near the third main pipe 31, and close the valve on the second connecting pipe 33 connected to the first subsea pipeline 6 near the fourth main pipe 32. The oil and gas input from the first main pipe 11 are transported to the shallow water platform via the first subsea pipeline 6, the third main pipe 31, and the third subsea pipeline 8. Close the valve at the outlet of the subsea booster device 2, open the valve on the bypass pipe 21, open the valve on the second connecting pipe 33 connected to the jumper pipe near the fourth main pipe 32, close the valve on the second connecting pipe 33 connected to the jumper pipe near the third main pipe 31, open the valves on the remaining second connecting pipes 33 near the fourth main pipe 32, and close the valves on the remaining second connecting pipes 33 near the third main pipe 31. This allows the oil and gas input from the second main pipe 12 and the oil and gas produced by the production well 4 connected to the second manifold 3 to be simultaneously input into the fourth main pipe 32 and transported to the shallow water platform via the fourth subsea pipeline 9.

[0046] (2) After the gas field is put into production, Q2+Q3 is less than twice Q1, but greater than Q1. At the same time, the pressure of each well is sufficient and there is no need for underwater pressurization: In this working condition, the third subsea pipeline 8 between the second manifold 3 and the shallow water treatment platform 5 is in operation, and the fourth subsea pipeline 9 is out of operation; by controlling the valves at both ends of the first connecting pipes 13 on the first manifold 1, the gas volume input to the first main pipe 11 or the second main pipe 12 of different production wells 4 is adjusted so that the gas volume of the first subsea pipeline 6 and the gas volume of the second subsea pipeline 7 are basically the same, and the gas volumes are Q2a and Q2b respectively. The pressure drop of pipeline transportation is reduced by using dual pipes, thereby reducing the demand for pipeline wellhead pressure.

[0047] Specifically, open the valve on the second connecting pipe 33 connected to the first subsea pipeline 6 near the third main pipe 31, close the valve on the second connecting pipe 33 connected to the first subsea pipeline 6 near the fourth main pipe 32, close the valve at the outlet of the subsea booster device 2, open the valve on the bypass pipe 21, open the valve on the second connecting pipe 33 connected to the jumper pipe near the third main pipe 31, close the valve on the second connecting pipe 33 connected to the jumper pipe near the fourth main pipe 32, open the valves on the remaining second connecting pipes 33 near the third main pipe 31, and close the valves on the remaining second connecting pipes 33 near the fourth main pipe 32, so that the oil and gas input from the first main pipe 11 and the second main pipe 12, as well as the oil and gas produced by the production well 4 connected to the second manifold 3, are simultaneously input into the third main pipe 31 and transported to the shallow water platform via the third subsea pipeline 8.

[0048] (3) After the gas field is put into production, Q2+Q3 is less than twice Q1, but greater than Q1. Some wells connected to the first manifold 1 have sufficient pressure and do not require subsea pressurization, while some wells have insufficient pressure and require pressurization. The wells on the second manifold 3 have sufficient pressure and do not require pressurization. Under this condition, the third subsea pipeline 8 between the second manifold 3 and the shallow water treatment platform 5 is in operation, and the fourth subsea pipeline 9 is out of operation. By controlling the valves at both ends of the first connecting pipes 13 on the first manifold 1, the wells with sufficient pressure and the wells with insufficient pressure are connected to the first main pipe 11 and the second main pipe 12, respectively.

[0049] Specifically, open the valve on the second connecting pipe 33 connected to the first subsea pipeline 6 near the third main pipe 31, and close the valve on the second connecting pipe 33 connected to the first subsea pipeline 6 near the fourth main pipe 32, so that the oil and gas in the first main pipe 11 can be input into the third main pipe 31; open the valve at the outlet of the subsea booster device 2, close the valve on the bypass pipe 21, open the valve on the second connecting pipe 33 connected to the jumper pipe near the third main pipe 31, and close the valve on the second connecting pipe 33 connected to the jumper pipe near the fourth main pipe 32, so that the oil and gas in the second main pipe 12 can be pressurized by the subsea booster device 2 and then input into the third main pipe 31; open the valves on the remaining second connecting pipes 33 near the third main pipe 31, and close the valves on the remaining second connecting pipes 33 near the fourth main pipe 32, so that the oil and gas produced by the production well 4 connected to the second manifold 3 can be input into the third main pipe 31; the oil and gas input into the third main pipe 31 is finally transported to the shallow water treatment platform 5 via the third subsea pipeline 8.

[0050] (4) After the gas field is put into production, Q2+Q3 is less than twice Q1, but greater than Q1. The pressure of all wells connected to the first manifold 1 is insufficient and pressurization is required, but the pressure of the wells connected to the second manifold 3 is sufficient and pressurization is not required. In this operating condition, the third subsea pipeline 8 between the second manifold 3 and the shallow water treatment platform 5 is in operation, and the fourth subsea pipeline 9 is out of operation. By controlling the valves at both ends of the first connecting pipes 13 on the first manifold 1, all wells connected to the first manifold 1 are connected to the second main pipe 12, so that the oil and gas produced by all wells connected to the first manifold 1 are input into the second main pipe 12.

[0051] Specifically, the valves at one end of the first main pipe 11 connected to the first subsea pipeline 6 and the valves on the second connecting pipe 33 connected to the first subsea pipeline 6 are closed. The valve at the outlet of the subsea booster device 2 is opened. The valve on the bypass pipe 21 is closed. The valve on the second connecting pipe 33 connected by the jumper pipe near the third main pipe 31 is opened. The valve on the second connecting pipe 33 connected by the jumper pipe near the fourth main pipe 32 is closed. The oil and gas in the second main pipe 12 are pressurized by the subsea booster device 2 and then input into the third main pipe 31. The valves on the remaining second connecting pipes 33 near the third main pipe 31 are opened. The valves on the remaining second connecting pipes 33 near the fourth main pipe 32 are closed. This allows the oil and gas produced by the production well 4 connected to the second manifold 3 to be input into the third main pipe 31. The oil and gas input into the third main pipe 31 are finally transported to the shallow water treatment platform 5 via the third subsea pipeline 8.

[0052] (5) After the gas field is put into production, Q2+Q3 is less than twice Q1, but greater than Q1. The pressure of all wells on the first manifold 1 and the second manifold 3 is insufficient, and pressurization is required. Under this condition, the third subsea pipeline 8 between the second manifold 3 and the shallow water treatment platform 5 is in operation, and the fourth subsea pipeline 9 is stopped. By controlling the valves at both ends of the first connecting pipes 13 on the first manifold 1, all wells connected to the first manifold 1 are connected to the second main pipe 12, so that the oil and gas produced by all wells connected to the first manifold 1 are input into the second main pipe 12.

[0053] Specifically, the valves on the second connecting pipes 33 corresponding to each well connected to the second manifold 3, near the third main pipe 31, are closed; the valves on the second connecting pipes 33 corresponding to each well connected to the second manifold 3, near the fourth main pipe 32, are opened, allowing the oil and gas produced by the production well 4 connected to the second manifold 3 to enter the fourth main pipe 32; the valves on the second connecting pipes 33 connected to the first subsea pipeline 6, near the fourth main pipe 32, are opened; the valves on the second connecting pipes 33 connected to the first subsea pipeline 6, near the third main pipe 31, are closed, allowing the oil and gas in the fourth main pipe 32 to enter the first main pipe 11; the valves at the interconnecting ends of the first main pipe 11 and the second main pipe 12 are opened respectively, allowing the oil and gas in the first main pipe 11 to enter the second main pipe 12; the valve at the outlet of the subsea booster device 2 is opened; the valve on the bypass pipe 21 is closed; the valve on the second connecting pipe 33 connected to the jumper pipe, near the third main pipe 31, is opened; the valve on the second connecting pipe 33 connected to the jumper pipe, near the fourth main pipe 32, is closed; the oil and gas in the second main pipe 12, after being pressurized by the subsea booster device 2, is entered into the third main pipe 31 and transported to the shallow water platform via the third subsea pipeline 8.

[0054] (6) After the gas field is put into production, Q2+Q3 is less than Q1, and all wells on the first manifold 1 and the second manifold 3 have insufficient pressure and need to be pressurized. At the same time, under this condition, in order to ensure that the gas volume delivered by the pipeline is greater than Q1, gas needs to be transported in reverse from the shallow water treatment platform 5 through the fourth subsea pipeline 9 to supplement the gas volume Q4. The gas volume of Q4 is equal to Q1-Q2.

[0055] Specifically, because gas needs to be pumped back from the platform to the central manifold, the wells under the jurisdiction of the second manifold 3 cannot bypass the first manifold 1 to enter the subsea booster 2 for pressurization through the second subsea pipeline 7. Therefore, it is necessary to close the valves on the second connecting pipes 33 corresponding to each well connected to the second manifold 3 to shut down the wells under the jurisdiction of the second manifold 3. By controlling the valves at both ends of each first connecting pipe 13 on the first manifold 1, all wells connected to the first manifold 1 are connected to the second main pipe 12, so that the oil and gas produced by all wells connected to the first manifold 1 are input into the second main pipe 12. The valve at the outlet of the subsea booster 2 is opened, and the valve on the bypass pipe 21 is closed. Open the valve on the second connecting pipe 33 near the third main pipe 31, and close the valve on the second connecting pipe 33 near the fourth main pipe 32. The oil and gas in the second main pipe 12 are pressurized by the underwater pressurization device 2 and then input into the third main pipe 31. The supplementary gas volume Q4 is input from the shallow water treatment platform 5 into the fourth main pipe 32 through the fourth subsea pipeline 9. Open the valves at the interconnecting ends of the third main pipe 31 and the fourth main pipe 32 respectively. The supplementary oil and gas input from the fourth main pipe 32 enters the third main pipe 31 and mixes with the gas field's self-produced gas volume Q2. Then, it is transported to the shallow water treatment platform 5 through the third subsea pipeline 8.

[0056] 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 self-adapting underwater pressure boosting system, characterized in that, The utility model relates to a kind of underwater production system, comprising: First manifold (1), the first manifold (1) includes first main pipe (11) and second main pipe (12), one end of the first main pipe (11) and the second main pipe (12) is connected with each other, the first main pipe (11) and the second main pipe (12) are respectively provided with valve at both ends, the first main pipe (11) and the second main pipe (12) between there are several first connecting pipes (13) arranged in parallel, each first connecting pipe (13) is connected with a production well (4) respectively, the production well (4) connected with each first connecting pipe (13) can selectively communicate with the first main pipe (11) or the second main pipe (12); Subsea booster device (2), the inlet of the subsea booster device (2) is connected with the other end of the second main pipe (12), bypass pipe (21) is arranged between the inlet and the outlet of the subsea booster device (2), valve is respectively arranged on the inlet of the subsea booster device (2) and the bypass pipe (21); Second manifold (3), the second manifold (3) includes third main pipe (31) and fourth main pipe (32), one end of the third main pipe (31) and the fourth main pipe (32) is connected with each other, the other end of the third main pipe (31) and the fourth main pipe (32) is connected with shallow water treatment platform (5), the third main pipe (31) and the fourth main pipe (32) between there are several second connecting pipes (33) arranged in parallel, one of the second connecting pipes (33) is connected with the first main pipe (11), another second connecting pipe (33) is connected with the outlet of the subsea booster device (2), the rest second connecting pipe (33) is connected with a production well (4) respectively, the first main pipe (11), the outlet of the subsea booster device (2) and the production well (4) connected with each second connecting pipe (33) can selectively communicate with the third main pipe (31) or the fourth main pipe (32) respectively.

2. The self-adapting underwater booster system of claim 1, wherein, One end of the first main pipe (11) and the second main pipe (12) is connected with each other by U-shaped pipe.

3. The self-adapting underwater booster system of claim 1, wherein, The first connecting pipe (13) is respectively provided with valve at both ends.

4. The self-adapting underwater booster system of claim 1, wherein, One end of the third main pipe (31) and the fourth main pipe (32) is connected with each other by U-shaped pipe.

5. The self-adapting underwater booster system of claim 1, wherein, The second connecting pipe (33) is respectively provided with valve at both ends.

6. The self-adapting underwater booster system of claim 1, wherein, The first main pipe (11) and the second main pipe (12) between there are three first connecting pipes (13) arranged in parallel, the third main pipe (31) and the fourth main pipe (32) between there are three second connecting pipes (33) arranged in parallel.

7. The self-adapting underwater booster system according to any one of claims 1 to 6, wherein, The subsea booster device (2) is subsea compressor.

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