An offshore oil and gas field regional development system integrating oil, gas and water pipelines

Abstract

This invention discloses an offshore oil and gas field regional development system that integrates oil, gas, and water pipeline networks. The development of new oil and gas field blocks comprehensively considers the oil, gas, and water pipeline networks of the region, systematically solving the problems of limited production water treatment capacity of existing platforms and insufficient transportation capacity of external subsea pipelines, which prevent older oilfields from increasing crude oil production through the addition of new adjustment wells or increased fluid production. Simultaneously, by rerouting the logistics of existing subsea pipelines and constructing new mixed-transport subsea pipelines and gas pipelines, a regional gas transmission network is formed, solving the problems of insufficient utilization of associated gas and resource waste and environmental pollution caused by combustion in flare systems.

Description

Technical Field

[0001] This invention belongs to the field of marine petroleum engineering technology, specifically relating to a regional development system for offshore oil and gas fields that integrates oil, gas, and water pipeline networks. Background Technology

[0002] For several years, an oil and gas field in the South China Sea has faced problems such as insufficient utilization of regional natural gas and production restrictions in older oil fields due to severe inadequate water treatment capacity. This has led to serious issues such as the large-scale burning and venting of surplus natural gas, increased carbon emissions, and failure to meet oil and gas production targets.

[0003] With the exploration and development of new oil and gas blocks, two large platforms need to be built in the area. Conventional oil and gas field development only needs to consider maximizing new production. However, given the existing problems in the area, addressing them simultaneously with the development of new oil and gas fields would fundamentally change the entire region's development. Therefore, there is an urgent need to propose a comprehensive offshore oil and gas field development system that integrates oil, gas, water, and pipeline networks, ensuring the feasibility of new oil and gas field development while also resolving long-standing problems in existing oil and gas fields.

[0004] Current status of the old oil and gas pipeline network: The oil outlet from the old area is a Floating Production Storage and Offloading (FPSO) vessel, which periodically unloads oil from the FPSO via tankers. There are four logistics branches entering the FPSO: WHP4 to WHP5 to FPSO, WHP2 and WHP3 together to WHP1 to FPSO, WHP6 to FPSO, and CEP to WHP8 to WHP7 and WHP9 together to WHP10 to FPSO. There are three gas outlets from the old area: gas from CEP is sent to city users via external gas pipelines; natural gas is utilized by turbine power plants installed on CEP, WHP9, and the FPSO; and excess natural gas is vented after combustion by flare arms installed on the FPSO. The old area's water outlet is a production water treatment system installed on the facilities. After treatment to meet standards, the water is discharged. The production water treatment capacities of each facility are as follows: FPSO: 18,000 cubic meters / day, WHP1: 3,000 cubic meters / day, WHP2: 6,400 cubic meters / day, WHP3: 5,450 cubic meters / day, WHP4: 3,500 cubic meters / day, WHP5: 23,500 cubic meters / day, WHP10: 3,000 cubic meters / day, WHP7: 4,250 cubic meters / day, and WHP8: 6,400 cubic meters / day.

[0005] See the flowchart for the logistics route of the old oil and gas pipeline network. Figure 1 .

[0006] Problems with the current state of oil and gas pipeline networks in old industrial areas:

[0007] ① The entire region has only one gas export outlet, CEP, and other facilities do not have gas pipelines connecting to CEP. The associated gas generated by other facilities can only be used for turbine power generation. Excess associated gas cannot be exported and can only be vented after combustion on FPSO, causing resource waste and environmental pollution, which is inconsistent with the "dual carbon target" proposed by the country.

[0008] ②The water treatment capacity of the entire region is severely insufficient. In addition, the transportation capacity of the submarine pipeline is limited, so the external drainage target and normal transportation of the submarine pipeline can only be met by limiting the output. Summary of the Invention

[0009] The purpose of this invention is to propose an offshore oil and gas field regional development system that integrates oil, gas and water pipeline networks, so as to address problems such as insufficient utilization of natural gas in old oil fields and production restrictions caused by severe water treatment capacity while developing new oil and gas fields.

[0010] The layout of the old oil and gas pipeline network includes: the oil outlet in the old area is a floating production storage and offloading vessel (FPSO), and oil is regularly unloaded and transported to the FPSO by oil tankers;

[0011] There are a total of four logistics branches entering the FPSO:

[0012] The first logistics branch is as follows: the logistics from wellhead platform WHP4 is transported to wellhead platform WHP5 via the oil, gas and water mixed transport subsea pipeline, and then combined with the logistics from wellhead platform WHP5 and transported to FPSO via the oil, gas and water mixed transport subsea pipeline.

[0013] The second logistics branch is as follows: the logistics of wellhead platform WHP2 and wellhead platform WHP3 are respectively transported to wellhead platform WHP1 via the oil, gas and water mixed transport subsea pipeline, and then combined with the logistics of wellhead platform WHP1 and transported to FPSO via the oil, gas and water trestle pipeline.

[0014] The third logistics branch is: the WHP6 wellhead platform's logistics are transported to the FPSO via the oil, gas and water mixed transport subsea pipeline;

[0015] The fourth logistics branch is as follows: the logistics from the central processing platform (CEP) is transported to the wellhead platform WHP8 via the oil-water mixed subsea pipeline, and together with the logistics from the wellhead platform WHP8, it is transported to the wellhead platform WHP7 via the oil-gas-water mixed subsea pipeline. The logistics from the wellhead platform WHP7 and the upstream platform, along with the logistics from the wellhead platform WHP9, are transported to the wellhead platform WHP10 via the oil-gas-water mixed subsea pipeline. Together with the logistics from the wellhead platform WHP10, they are transported to the FPSO via the oil-gas-water mixed subsea pipeline.

[0016] The gas from the central processing platform (CEP) is delivered to urban users via external gas pipelines;

[0017] Turbine power plants are installed on the central processing platform CEP and the wellhead platforms WHP9 and FPSO to utilize natural gas;

[0018] Install a flare arm on the FPSO to burn off excess natural gas and then vent it.

[0019] A production water treatment system is installed on the FPSO, and the production water treatment system has a water treatment capacity of 18,000 cubic meters / day;

[0020] A production water treatment system is installed on the wellhead platform WHP1, and the water treatment capacity of the production water treatment system is 3000 cubic meters / day;

[0021] A production water treatment system is installed on the wellhead platform WHP2, and the water treatment capacity of the production water treatment system is 6400 cubic meters / day.

[0022] A production water treatment system is installed on the wellhead platform WHP3, and the water treatment capacity of the production water treatment system is 5450 cubic meters / day.

[0023] A production water treatment system is installed on the wellhead platform WHP4, and the water treatment capacity of the production water treatment system is 3,500 cubic meters / day.

[0024] A production water treatment system is installed on the wellhead platform WHP5, and the water treatment capacity of the production water treatment system is 23,500 cubic meters / day.

[0025] A production water treatment system is installed on the wellhead platform WHP10, and the water treatment capacity of the production water treatment system is 3000 cubic meters / day;

[0026] A production water treatment system is installed on the wellhead platform WHP7, and the water treatment capacity of the production water treatment system is 4250 cubic meters / day.

[0027] A production water treatment system is installed on the wellhead platform WHP8, and the water treatment capacity of the production water treatment system is 6400 cubic meters / day.

[0028] The offshore oil and gas field regional development system that integrates oil, gas and water pipeline networks provided by this invention makes the following improvements based on the existing oil and gas pipeline network layout:

[0029] A drilling and production platform DPP2 is connected to the wellhead platform WHP1 via a trestle. A production water treatment system is installed on drilling and production platform DPP2, and the water treatment capacity of the production water treatment system is 48,000 cubic meters / day.

[0030] Two 5.5MW gas turbine units are installed on the drilling and production platform DPP2;

[0031] Furthermore, the logistics originally gathered and transported to wellhead platform WHP1 (i.e., the logistics from wellhead platforms WHP2 and WHP3 together to wellhead platform WHP1) are transported via trestle to drilling and production platform DPP2 for further dehydration treatment to a water content of 50%, and then returned to FPSO.

[0032] The newly constructed drilling and production platform DPP1 is connected to the wellhead platform WHP10 and the drilling and production platform DPP2 via an oil, gas and water mixed transportation subsea pipeline, and is also connected to the central processing platform CEP via a gas transportation subsea pipeline.

[0033] A production water treatment system is installed on the drilling and production platform DPP1, with a water treatment capacity of 14,400 cubic meters per day.

[0034] Two 11.5MW gas turbine units are installed on the drilling and production platform DPP1;

[0035] The original logistics route from gathering and transporting to wellhead platform WHP10 was rerouted to drilling and production platform DPP1, freeing up the original oil, gas and water mixed transportation pipeline from wellhead platform WHP10 to FPSO. After wellhead platform WHP10 and its upstream logistics are transported to drilling and production platform DPP1, they are further dehydrated and degassed. Part of the dehydrated gas is used for gas injection development, and part is treated to meet standards and supplied to gas turbine power generation. The remaining associated gas is transported to the central processing platform CEP through a newly built gas pipeline for further processing into qualified gas, and then sent to the gas trunk line from YC to HK. The dehydrated liquid is treated to a water content of 50% and then transported to drilling and production platform DPP2 through the oil-water mixed transportation subsea pipeline.

[0036] The vacant oil, gas and water mixed pipeline from wellhead platform WHP10 to FPSO was converted into a reverse gas pipeline. After the associated gas from drilling and production platform DPP2, wellhead platform WHP1 and its upstream logistics meets the needs of gas turbine power generation, the excess associated gas is transported from FPSO to wellhead platform WHP10 through the aforementioned reverse gas pipeline, and then transported to drilling and production platform DPP1 through the oil, gas and water mixed pipeline from wellhead platform WHP10 to drilling and production platform DPP1. After being mixed with other logistics, it is further processed and transported out.

[0037] Compared with conventional oil and gas field development systems, the advantages of this invention are:

[0038] 1. By adding 48,000 cubic meters / day of water treatment capacity to the drilling and production platform DPP2, the production capacity of the wellhead platform WHP1 and its upstream facilities can be released.

[0039] 2. By adding two 5.5MW gas turbine units to the drilling and production platform DPP2, the associated gas of the drilling and production platform DPP2, the wellhead platform WHP1 and its upstream logistics can be utilized more fully, and power can be provided for the development of new oil and gas fields.

[0040] 3. By converting the original mixed-transport pipeline from the wellhead platform WHP10 to the FPSO into a reverse-transport gas pipeline, the excess associated gas from the drilling and production platform DPP2, the wellhead platform WHP1, and their upstream logistics has an outlet, reducing the waste and pollution caused by the FPSO flare combustion.

[0041] 4. By setting a water treatment capacity of 14,400 cubic meters per day on the drilling and production platform DPP1, the production capacity of the wellhead platform WHP10 and its upstream facilities can be released.

[0042] 5. By adding two 11.5MW gas turbine units to the drilling and production platform DPP1, the associated gas of the wellhead platform WHP10 and its upstream logistics can be utilized more fully, and power can be provided for the development of new oil and gas fields. Attached Figure Description

[0043] Figure 1 A flowchart illustrating the logistics route of the old oil and gas pipeline network.

[0044] Figure 2 This describes the logistics flow after using the system of the present invention. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to specific embodiments. The given embodiments are merely illustrative of the invention and not intended to limit its scope. The embodiments provided below can serve as a guide for further improvements by those skilled in the art and do not constitute a limitation on the invention in any way.

[0046] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Unless otherwise specified, the materials and reagents used in the following examples are commercially available.

[0047] Example

[0048] For old oil and gas pipeline networks ( Figure 1 Based on the above, an integrated offshore oil and gas field regional development system will be established, encompassing oil, gas, and water pipeline networks.

[0049] The layout of the old oil and gas pipeline network includes: the oil outlet in the old area is a floating production storage and offloading vessel (FPSO), and oil is regularly unloaded and transported to the FPSO by oil tankers;

[0050] The old area's oil and gas pipeline network has four logistics branches entering the FPSO:

[0051] The first logistics branch is as follows: the logistics from wellhead platform WHP4 is transported to wellhead platform WHP5 via the oil, gas and water mixed transport subsea pipeline, and then combined with the logistics from wellhead platform WHP5 and transported to FPSO via the oil, gas and water mixed transport subsea pipeline.

[0052] The second logistics branch is as follows: the logistics of wellhead platform WHP2 and wellhead platform WHP3 are respectively transported to wellhead platform WHP1 via the oil, gas and water mixed transport subsea pipeline, and then combined with the logistics of wellhead platform WHP1 and transported to FPSO via the oil, gas and water trestle pipeline.

[0053] The third logistics branch is: the WHP6 wellhead platform's logistics are transported to the FPSO via the oil, gas and water mixed transport subsea pipeline;

[0054] The fourth logistics branch is as follows: the logistics from the central processing platform (CEP) is transported to the wellhead platform WHP8 via the oil-water mixed subsea pipeline, and together with the logistics from the wellhead platform WHP8, it is transported to the wellhead platform WHP7 via the oil-gas-water mixed subsea pipeline. The logistics from the wellhead platform WHP7 and the upstream platform, along with the logistics from the wellhead platform WHP9, are transported to the wellhead platform WHP10 via the oil-gas-water mixed subsea pipeline. Together with the logistics from the wellhead platform WHP10, they are transported to the FPSO via the oil-gas-water mixed subsea pipeline.

[0055] The gas from the central processing platform (CEP) is delivered to urban users via external gas pipelines;

[0056] Turbine power plants are installed on the central processing platform CEP and the wellhead platforms WHP9 and FPSO to utilize natural gas;

[0057] Install a flare arm on the FPSO to burn off excess natural gas and then vent it.

[0058] A production water treatment system is installed on the FPSO, and the production water treatment system has a water treatment capacity of 18,000 cubic meters / day;

[0059] A production water treatment system is installed on the wellhead platform WHP1, and the water treatment capacity of the production water treatment system is 3000 cubic meters / day;

[0060] A production water treatment system is installed on the wellhead platform WHP2, and the water treatment capacity of the production water treatment system is 6400 cubic meters / day.

[0061] A production water treatment system is installed on the wellhead platform WHP3, and the water treatment capacity of the production water treatment system is 5450 cubic meters / day.

[0062] A production water treatment system is installed on the wellhead platform WHP4, and the water treatment capacity of the production water treatment system is 3,500 cubic meters / day.

[0063] A production water treatment system is installed on the wellhead platform WHP5, and the water treatment capacity of the production water treatment system is 23,500 cubic meters / day.

[0064] A production water treatment system is installed on the wellhead platform WHP10, and the water treatment capacity of the production water treatment system is 3000 cubic meters / day;

[0065] A production water treatment system is installed on the wellhead platform WHP7, and the water treatment capacity of the production water treatment system is 4250 cubic meters / day.

[0066] A production water treatment system is installed on the wellhead platform WHP8, and the water treatment capacity of the production water treatment system is 6400 cubic meters / day.

[0067] The offshore oil and gas field regional development system that integrates oil, gas and water pipeline networks provided by this invention makes the following improvements based on the existing oil and gas pipeline network layout:

[0068] A drilling and production platform DPP2 is connected to the wellhead platform WHP1 via a trestle. A production water treatment system is installed on drilling and production platform DPP2, and the water treatment capacity of the production water treatment system is 48,000 cubic meters / day.

[0069] Two 5.5MW gas turbine units are installed on the drilling and production platform DPP2;

[0070] Furthermore, the logistics originally gathered and transported to wellhead platform WHP1 (i.e., the logistics from wellhead platforms WHP2 and WHP3 together to wellhead platform WHP1) are transported via trestle to drilling and production platform DPP2 for further dehydration treatment to a water content of 50%, and then returned to FPSO.

[0071] The newly constructed drilling and production platform DPP1 is connected to the wellhead platform WHP10 and the drilling and production platform DPP2 via an oil, gas and water mixed transportation subsea pipeline, and is also connected to the central processing platform CEP via a gas transportation subsea pipeline.

[0072] A production water treatment system is installed on the drilling and production platform DPP1, with a water treatment capacity of 14,400 cubic meters per day.

[0073] Two 11.5MW gas turbine units are installed on the drilling and production platform DPP1;

[0074] The original logistics route from gathering and transporting to wellhead platform WHP10 was rerouted to drilling and production platform DPP1, freeing up the original oil, gas and water mixed transportation pipeline from wellhead platform WHP10 to FPSO. After wellhead platform WHP10 and its upstream logistics are transported to drilling and production platform DPP1, they are further dehydrated and degassed. Part of the dehydrated gas is used for gas injection development, and part is treated to meet standards and supplied to gas turbine power generation. The remaining associated gas is transported to the central processing platform CEP through a newly built gas pipeline for further processing into qualified gas, and then sent to the gas trunk line from YC to HK. The dehydrated liquid is treated to a water content of 50% and then transported to drilling and production platform DPP2 through the oil-water mixed transportation subsea pipeline.

[0075] The vacant oil, gas and water mixed pipeline from wellhead platform WHP10 to FPSO was converted into a reverse gas pipeline. After the associated gas from drilling and production platform DPP2, wellhead platform WHP1 and its upstream logistics meets the needs of gas turbine power generation, the excess associated gas is transported from FPSO to wellhead platform WHP10 through the aforementioned reverse gas pipeline, and then transported to drilling and production platform DPP1 through the oil, gas and water mixed pipeline from wellhead platform WHP10 to drilling and production platform DPP1. After being mixed with other logistics, it is further processed and transported out.

[0076] System such as Figure 2 As shown.

[0077] The present invention has been described in detail above. Those skilled in the art will recognize that the invention can be practiced in a wide range of ways with equivalent parameters, concentrations, and conditions without departing from its spirit and scope, and without requiring unnecessary experiments. While specific embodiments have been provided, it should be understood that further modifications can be made to the invention. In summary, according to the principles of the invention, this application is intended to include any changes, uses, or improvements to the invention, including changes made using conventional techniques known in the art that depart from the scope disclosed herein.

Claims

1. A comprehensive offshore oil and gas field regional development system that integrates oil, gas and water pipeline networks, including wellhead platforms WHP2, WHP3, WHP1, DPP2, WHP4, WHP5, WHP6, CEP, WHP8, WHP7, WHP10, DPP1, WHP9, FPSO, several oil, gas and water mixed subsea pipelines, several gas subsea pipelines, several gas turbine units, and several production water treatment systems; Wellhead platform WHP10 is first connected to drilling and production platform DPP1 via oil, gas and water mixed subsea pipeline. DPP1 is connected to drilling and production platform DPP2 and central processing platform CEP via oil-water mixed subsea pipeline and gas subsea pipeline, respectively. The aforementioned platforms constitute three logistics branches leading to the FPSO; The first logistics branch is as follows: the logistics from wellhead platform WHP4 is transported to wellhead platform WHP5 via the oil, gas and water mixed transport subsea pipeline, and then combined with the logistics from wellhead platform WHP5 and transported to FPSO via the oil, gas and water mixed transport subsea pipeline. The second logistics branch is as follows: the logistics from wellhead platform WHP2 and wellhead platform WHP3 are respectively transported to wellhead platform WHP1 via the oil-gas-water mixed subsea pipeline. They are then combined with the logistics from wellhead platform WHP1 and transported to the drilling and production platform DPP2 via the oil-gas-water trestle pipeline. Together with the logistics from drilling and production platform DPP2, they undergo dehydration and degassing treatment. The dehydrated water is discharged into the sea after meeting the treatment standards. Part of the dehydrated gas is used to power the platform's gas turbine for power generation. The remaining associated gas and dehydrated crude oil are returned to wellhead platform WHP1 via the trestle pipeline and then transported to the FPSO via the oil-gas-water mixed subsea pipeline. The logistics from the central processing platform (CEP) are transported to wellhead platform WHP8 via an oil-water mixed transport subsea pipeline. The logistics from WHP8, along with the logistics from WHP7, are then transported to wellhead platform WHP7 via an oil-gas-water mixed transport subsea pipeline. Logistics from WHP7 and upstream platforms, along with logistics from WHP9, are then transported to wellhead platform WHP10 via separate oil-gas-water mixed transport subsea pipelines. Finally, the logistics from WHP10, together with the logistics from WHP10, are transported to drilling and production platform DPP1 for dehydration and degassing. The dehydrated water, after meeting treatment standards, is discharged into the sea on-site. A portion of the degassing is used to supply fuel to the platform. The associated gas generated by the gas turbine is partially processed and supplied to the platform for gas injection and development. The remaining associated gas is transported to the central processing platform (CEP) via a newly constructed subsea pipeline. After being combined with the CEP logistics, it is further processed into qualified commercial gas and then transported to the main gas pipeline via a branch pipeline from the CEP to the main pipeline. The dehydrated crude oil is transported to the drilling and production platform (DPP2) via an oil-water mixed subsea pipeline. After being combined with the DPP2 logistics, it is returned to the wellhead platform (WHP1) via a trestle pipeline and then transported to the FPSO via an oil-gas-water mixed subsea pipeline. The third logistics branch is: the WHP6 wellhead platform's logistics are transported to the FPSO via the oil, gas and water mixed transport subsea pipeline.

2. The offshore oil and gas field regional development system integrating oil, gas, and water pipeline networks as described in claim 1, characterized in that: The drilling and production platform DPP2 is connected to the wellhead platform WHP1 by a trestle. A production water treatment system is installed on the drilling and production platform DPP2. The production water treatment system has a production water treatment capacity of 48,000 cubic meters / day. The production water from the drilling and production platform DPP2, the wellhead platform WHP1 and its upstream logistics are dehydrated on the drilling and production platform DPP2. After the dehydrated production water meets the treatment requirements, it is discharged into the sea on-site. A gas turbine unit is installed on the drilling and production platform DPP2. The gas turbine unit consists of two 5.5MW gas turbine units. The associated gas from the drilling and production platform DPP2, the wellhead platform WHP1, and its upstream logistics is given priority to meet the power generation needs of the gas turbine unit on the drilling and production platform DPP2. A production water treatment system is installed on the drilling and production platform DPP1. The production water treatment system has a production water treatment capacity of 14,400 cubic meters per day. The production water of the drilling and production platform DPP1 and its upstream logistics is dehydrated on the drilling and production platform DPP1. After the dehydrated production water meets the treatment requirements, it is discharged into the sea on-site. A gas turbine unit is installed on the drilling and production platform DPP1. The gas turbine unit consists of two 11.5MW gas turbine units. The associated gas from the drilling and production platform DPP1 and its upstream logistics will be used to generate electricity for the newly built gas turbine unit of the drilling and production platform DPP1.

3. The offshore oil and gas field regional development system integrating oil, gas, and water pipeline networks as described in claim 2, characterized in that: A production water treatment system is installed on the wellhead platform WHP1, and the water treatment capacity of the production water treatment system is 3000 cubic meters / day; A production water treatment system is installed on the wellhead platform WHP2, and the water treatment capacity of the production water treatment system is 6400 cubic meters / day. A production water treatment system is installed on the wellhead platform WHP3, and the water treatment capacity of the production water treatment system is 5450 cubic meters / day. A production water treatment system is installed on the wellhead platform WHP4, and the water treatment capacity of the production water treatment system is 3,500 cubic meters / day. A production water treatment system is installed on the wellhead platform WHP5, and the water treatment capacity of the production water treatment system is 23,500 cubic meters / day. A production water treatment system is installed on the wellhead platform WHP10, and the water treatment capacity of the production water treatment system is 3000 cubic meters / day; A production water treatment system is installed on the wellhead platform WHP7, and the water treatment capacity of the production water treatment system is 4250 cubic meters / day. A production water treatment system is installed on the wellhead platform WHP8, and the water treatment capacity of the production water treatment system is 6400 cubic meters / day.

4. The offshore oil and gas field regional development system integrating oil, gas, and water pipeline networks as described in claim 3, characterized in that: The gas from the central processing platform (CEP) is delivered to urban users via external gas pipelines; Gas turbine units are installed on the central processing platform CEP and the wellhead platforms WHP9 and FPSO to utilize natural gas; Install a flare arm on the FPSO to burn off excess natural gas and then vent it. A production water treatment system is installed on the FPSO, and the water treatment capacity of the production water treatment system is 18,000 cubic meters / day.

5. The offshore oil and gas field regional development system integrating oil, gas, and water pipeline networks according to claim 4, characterized in that: The regional gas transmission pipeline network of the offshore oil and gas field regional development system, which integrates oil, gas and water pipeline networks, consists of the following four pipelines: (1) Subsea gas pipeline from FPSO to wellhead platform WHP10; (2) Oil, gas and water mixed transportation pipeline from wellhead platform WHP10 to drilling and production platform DPP1; (3) The subsea gas pipeline from the drilling and production platform DPP1 to the central processing platform CEP; (4) Gas transmission branch lines from the central processing platform (CEP) to the main gas transmission line.

6. The offshore oil and gas field regional development system integrating oil, gas, and water pipeline networks as described in claim 5, characterized in that: After the associated gas from the drilling and production platform DPP2, wellhead platform WHP1 and its upstream platform logistics meets the needs of the gas turbine power generation of the drilling and production platform DPP2, the excess associated gas is transported to the FPSO through the oil, gas and water mixed transport subsea pipeline from wellhead platform WHP1. Associated gas from the wellhead platform WHP5 and upstream platform logistics is transported to the FPSO via the oil, gas and water mixed transport subsea pipeline. The associated gas from the WHP6 wellhead platform is transported to the FPSO via the oil, gas and water mixed transport subsea pipeline; After the associated gas supplied to the FPSO meets the needs of the FPSO gas turbine power generation, the excess associated gas is transported to the offshore platform WHP10 via the gas transmission subsea pipeline from the FPSO to the wellhead platform WHP10, and then to the drilling and production platform DPP1 via the oil, gas and water mixed transmission subsea pipeline from the offshore platform WHP10 to the drilling and production platform DPP1. After the associated gas from the drilling and production platform DPP1 and the associated gas from its upstream logistics meet the needs of the gas turbine power generation and gas injection of the drilling and production platform DPP1, any excess associated gas is transported to the central processing platform CEP via the subsea gas pipeline from the drilling and production platform DPP1. After further processing into qualified commercial gas, it is then transported to the main gas transmission line via the gas branch pipeline from the central processing platform CEP to the main gas transmission line.

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