CN-117127944-B - Marine oil-gas field area development system for overall oil-gas-water pipe network

Abstract

The invention discloses a marine oil-gas field area development system for comprehensively planning an oil-gas-water pipe network. The development of the new oil-gas field block comprehensively considers the oil, gas and water pipe networks of the supported area, and systematically solves the problems that the supported area has limited production water treatment capacity of the established platform and insufficient conveying capacity of the external-conveying submarine pipeline, so that the old oil field can not improve the crude oil yield by newly increasing an adjusting well or improving the liquid yield. Meanwhile, through the logistics redirection of the built submarine pipeline, the newly-built mixed transportation submarine pipeline and the gas transportation submarine pipeline, a regional gas transportation pipe network is formed, and the problems of resource waste and environmental pollution caused by insufficient utilization of regional associated gas and combustion of a fire-removing torch emptying system are solved.

Inventors

• LIU XIANGDONG
• ZHANG WENXIN
• JIANG SHUHONG
• XU ZHENGHAI
• ZHANG DI
• Yan Xiajing
• YU LU
• QIN XIAOGANG
• LIANG WENZHOU
• MA CHENBO

Assignees

• 中国海洋石油集团有限公司
• 中海油研究总院有限责任公司

Dates

Publication Date

20260505

Application Date

20230905

Claims (6)

1. 1. An offshore oil and gas field regional development system for comprehensively planning an oil and gas water pipe network comprises a wellhead platform WHP2, a wellhead platform WHP3, a wellhead platform WHP1, a drilling and production platform DPP2, a wellhead platform WHP4, a wellhead platform WHP5, a wellhead platform WHP6, a central processing platform CEP, a wellhead platform WHP8, a wellhead platform WHP7, a wellhead platform WHP10, a drilling and production platform DPP1, a wellhead platform WHP9, a floating production oil storage ship FPSO, a plurality of oil and gas water mixed transportation subsea pipelines, a plurality of oil and gas mixed transportation subsea pipelines, a plurality of gas transmission subsea pipelines, a plurality of gas turbine sets and a plurality of production water processing systems; the wellhead platform WHP10 is connected with the drilling and production platform DPP1 through an oil-gas-water mixed transmission submarine pipeline, and the drilling and production platform DPP1 is connected with the drilling and production platform DPP2 and the central processing platform CEP through an oil-water mixed transmission submarine pipeline and a gas transmission submarine pipeline respectively; the platform forms three logistics branches to enter the FPSO; The first logistics branch is that a wellhead platform WHP4 logistics is conveyed to a wellhead platform WHP5 through an oil-gas-water mixed conveying subsea pipeline, and the wellhead platform WHP5 logistics is converged and conveyed to an FPSO through the oil-gas-water mixed conveying subsea pipeline; The second logistics branch is that wellhead platform WHP2 logistics and wellhead platform WHP3 logistics are respectively conveyed to wellhead platform WHP1 through oil-gas-water mixed conveying submarine pipelines, conveyed to drilling and production platform DPP2 together with wellhead platform WHP1 logistics through oil-gas-water trestle pipelines, dehydrated and degassed together with drilling and production platform DPP2 logistics, discharged in situ after the dehydrated water treatment reaches the standard, a part of the dehydrated gas is used for platform gas turbine power generation, and the rest associated gas and dehydrated crude oil are returned to wellhead platform WHP1 through trestle pipelines and conveyed to FPSO through oil-gas-water mixed conveying submarine pipelines; The central processing platform CEP material flow is conveyed to a wellhead platform WHP8 through an oil-water mixed conveying submarine pipeline, the well-head platform WHP7 and the upstream platform material flow are conveyed to a wellhead platform WHP10 through an oil-water mixed conveying submarine pipeline respectively together with the wellhead platform WHP10 material flow, the well-head platform CEP material flow is conveyed to the drilling platform DPP1 through an oil-water mixed conveying submarine pipeline together with the wellhead platform WHP10 material flow, dehydration and degassing treatment are carried out, and the removed water treatment reaches the standard and then is discharged from sea in situ; the third material flow branch is that the wellhead platform WHP6 material flow is conveyed to the FPSO through an oil-gas-water mixed conveying submarine pipeline.
2. 2. The offshore oil and gas field area development system for orchestrating an oil, gas and water pipe network according to claim 1, wherein: the method comprises the steps that a wellhead platform WHP1 is connected with a drilling and production platform DPP2 through a trestle, a production water treatment system is arranged on the drilling and production platform DPP2, the production water treatment capacity of the production water treatment system is 48000 cubic meters per day, the drilling and production platform DPP2, the wellhead platform WHP1 and production water of upstream logistics thereof are dehydrated on the drilling and production platform DPP2, and the separated production water is discharged from the sea in situ after being qualified in treatment; Setting a gas turbine set on the drilling and production platform DPP2, wherein the gas turbine set is 2 gas turbine sets with the power of 5.5MW, and the drilling and production platform DPP2, a wellhead platform WHP1 and associated gas of upstream logistics thereof preferentially meet the power generation use of the drilling and production platform DPP2 gas turbine set; A production water treatment system is arranged on the drilling and production platform DPP1, the production water treatment capacity of the production water treatment system is 14400 cubic meters per day, the drilling and production platform DPP1 and the production water of the upstream logistics thereof are dehydrated on the drilling and production platform DPP1, and the separated production water is discharged from the sea in situ after being qualified in treatment; The gas turbine unit is arranged on the drilling and production platform DPP1, the gas turbine unit is 2 gas turbine units with the power of 11.5MW, and the drilling and production platform DPP1 and associated gas of upstream logistics thereof preferentially meet the power generation requirement of the newly-built drilling and production platform DPP1 gas turbine unit.
3. 3. The offshore oil and gas field area development system for orchestrating an oil, gas and water pipe network according to claim 2, wherein: A production water treatment system is arranged on a wellhead platform WHP1, and the water treatment capacity of the production water treatment system is 3000 cubic meters per day; A production water treatment system is arranged on a wellhead platform WHP2, and the water treatment capacity of the production water treatment system is 6400 cubic meters per day; a production water treatment system is arranged on a wellhead platform WHP3, and the water treatment capacity of the production water treatment system is 5450 cubic meters per day; A production water treatment system is arranged on a wellhead platform WHP4, and the water treatment capacity of the production water treatment system is 3500 cubic meters per day; a production water treatment system is arranged on a wellhead platform WHP5, and the water treatment capacity of the production water treatment system is 23500 cubic meters per day; A production water treatment system is arranged on a wellhead platform WHP10, and the water treatment capacity of the production water treatment system is 3000 cubic meters per day; A production water treatment system is arranged on a wellhead platform WHP7, and the water treatment capacity of the production water treatment system is 4250 cubic meters per day; A production water treatment system having a water treatment capacity of 6400 cubic meters per day was provided on wellhead platform WHP 8.
4. 4. The system for developing an offshore oil and gas field area for orchestrating an oil, gas and water pipe network according to claim 3, wherein the gas of the CEP of the central processing platform is sent to urban users through an external gas pipeline; providing a gas turbine unit on a central processing platform CEP and wellhead platforms WHP9 and FPSO to utilize natural gas; A flare arm is arranged on the FPSO to burn and empty the redundant natural gas; A production water treatment system is provided on the FPSO, the production water treatment system having a water treatment capacity of 18000 cubic meters per day.
5. 5. The system for developing an offshore oil and gas field area of an overall oil and gas water pipe network according to claim 4, wherein the area gas pipeline network of the system for developing an offshore oil and gas field area of the overall oil and gas water pipe network comprises the following four pipelines: (1) A gas subsea pipeline from the FPSO to the wellhead platform WHP 10; (2) An oil-gas-water mixed transmission pipeline from a wellhead platform WHP10 to the drilling and production platform DPP 1; (3) The gas transmission submarine pipeline from the drilling and production platform DPP1 to the central processing platform CEP; (4) The central processing platform CEP to the gas transfer branch line of the gas transfer trunk.
6. 6. The system for developing an offshore oil and gas field area for an integrated oil and gas water pipe network according to claim 5, wherein: After the associated gas of the drilling and production platform DPP2, the wellhead platform WHP1 and the upstream platform logistics thereof meet the requirement of the drilling and production platform DPP2 gas turbine power generation, redundant associated gas is conveyed to the FPSO through oil-gas-water mixed conveying submarine pipelines from the wellhead platform WHP1 to the FPSO; the wellhead platform WHP5 and associated gas of the upstream platform logistics are conveyed to the FPSO through an oil-gas-water mixed conveying submarine pipeline; associated gas of a wellhead platform WHP6 is conveyed to the FPSO through an oil-gas-water mixed conveying submarine pipeline; After the associated gas conveyed to the FPSO meets the requirement of power generation of an FPSO gas turbine, the redundant associated gas is conveyed to an offshore platform wellhead platform WHP10 through a gas conveying submarine pipeline from the FPSO to the wellhead platform WHP10, and then conveyed to the drilling and production platform DPP1 through an oil-gas-water mixed conveying submarine pipeline from the offshore platform wellhead platform WHP10 to the drilling and production platform DPP1; After the associated gas of the drilling and production platform DPP1 and the associated gas of the upstream logistics meet the requirements of the gas turbine power generation and gas injection of the drilling and production platform DPP1, redundant associated gas is conveyed to the central processing platform CEP through gas transmission subsea pipelines from the drilling and production platform DPP1 to the central processing platform CEP, and is conveyed to the gas transmission trunk through gas transmission branch pipelines from the central processing platform CEP to the gas transmission trunk after being further processed into qualified commodity gas.

Description

Marine oil-gas field area development system for overall oil-gas-water pipe network Technical Field The invention belongs to the technical field of offshore oil engineering, and particularly relates to a marine oil and gas field area development system for comprehensively planning an oil and gas water pipe network. Background For several years, a certain oil-gas field in south China sea faces the problems of insufficient utilization of regional natural gas, limited production caused by serious insufficient water treatment capacity of old oil fields and the like. Thereby bringing serious problems of burning and emptying a large amount of residual natural gas, increasing carbon emission, and substandard oil gas yield. With the exploration and development of new hydrocarbon blocks, two large platforms need to be newly built in the area. The development of conventional oil and gas fields only needs to consider the excavation of new yield, but in view of a series of problems existing in the area, if the problems can be solved simultaneously when the development of the new oil and gas fields is carried out, the development of the whole area can be changed in quality. Therefore, it is highly desirable to provide a system for developing offshore oil and gas field areas for comprehensively planning oil and gas water pipe networks, which solves the old problems of the old oil and gas fields for many years on the premise of ensuring the development feasibility of new oil and gas fields. The current situation of old oil-gas pipe network describes that the oil outlet of old area is a floating production oil storage ship (FPSO), and the FPSO is discharged and output through the tanker periodically. There are four branches into the FPSO, WHP4 to WHP5 to FPSO, WHP2 to WHP1 to FPSO together with WHP3, WHP6 to FPSO, CEP to WHP8 to WHP7 to WHP10 to FPSO together with WHP9, respectively. The gas outlet paths of the old area are three types, namely CEP gas is sent to urban users through an external gas pipeline, turbine power stations are arranged on CEP, WHP9 and FPSO, natural gas is utilized by the turbine power stations, and a flare arm is arranged on the FPSO to burn and empty the redundant natural gas. The water outlet of the old area is provided with a production water treatment system on facilities, and the production water is discharged after reaching the treatment standard, wherein the production water treatment capacity of each facility is as follows, FPSO is 18000 square/day, WHP1 is 3000 square/day, WHP2 is 6400 square/day, WHP3 is 5450 square/day, WHP4 is 3500 square/day, WHP5 is 23500 square/day, WHP10 is 3000 square/day, WHP7 is 4250 square/day, and WHP8 is 6400 square/day. The flow direction block diagram of the old oil-gas pipe network is shown in figure 1. The current situation of the oil-gas pipe network in the old area is that: ① The whole region is provided with only one outlet CEP, other facilities do not have gas pipelines communicated with the CEP, the associated gas generated by other facilities can only be utilized through turbine power generation, the redundant associated gas cannot be externally transmitted, and can only be discharged after being burnt on an FPSO (floating production storage and offloading), so that the problems of resource waste, environmental pollution and the like are caused, and the problems are not consistent with the double-carbon target proposed by the country. ② The whole area has serious insufficient water treatment capacity, and in addition, the submarine pipeline conveying capacity is limited, so that the external drainage index and the normal conveying of the submarine pipeline can be met only by limiting the yield. Disclosure of Invention The invention aims to provide a marine oil and gas field region development system for comprehensively planning an oil and gas water pipe network, which solves the problems of insufficient utilization of natural gas in an old oil field, limited production caused by serious insufficient water treatment capacity and the like while developing a new oil and gas field. The old oil-gas pipe network layout comprises that an oil outlet path of an old area is a floating production oil storage ship (FPSO), and the FPSO is discharged and conveyed out through an oil tanker periodically; A total of four streams branch into the FPSO: The first logistics branch is that a wellhead platform WHP4 logistics is conveyed to a wellhead platform WHP5 through an oil-gas-water mixed conveying subsea pipeline, and the wellhead platform WHP5 logistics is converged and conveyed to an FPSO through the oil-gas-water mixed conveying subsea pipeline; the second logistics branch is that wellhead platform WHP2 logistics and wellhead platform WHP3 logistics are respectively conveyed to wellhead platform WHP1 through oil-gas-water mixed conveying submarine pipelines, and together with wellhead platform WHP1 logistics, conveyed to FPSO through oil-gas-water trestle pipelin