Offshore platform authigenic carbon source CCUS device and process

Abstract

The invention belongs to the technical field of offshore platform carbon dioxide oil displacement, and discloses a safe, efficient, economical and feasible offshore platform authigenic carbon source CCUS device and process. The device comprises an oil-gas separator, a membrane separation device, a first compression assembly, a second compression assembly and a bypass pipeline, outlets of the first compression assembly and the second compression assembly are connected with a CCS sealing well and a CCUS effective well respectively, an inlet of the oil-gas separator is connected with an outlet of a high-carbon gas source well and an outlet of the CCUS effective well, one end of the bypass pipeline is connected between the oil-gas separator and the membrane separation device, and the other end of the bypass pipeline is connected with the membrane separation device. The other end is connected between the membrane separation device and the first compression assembly. In the non-overload mode, output gas of the high-carbon gas source well and the CCUS effective well passes through the oil-gas separator and the membrane separation device and then passes through the first compression assembly and / or the second compression assembly to the CCUS effective well; in the overload mode, after CO2 of the high-carbon gas source well and the CCUS effective well passes through the oil-gas separator, part of the CO2 passes through the bypass pipeline and the first compression assembly to reach the CCS sealing well, and the other part of the CO2 passes through the membrane separation device and the second compression assembly to reach the CCUS effective well.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore platform carbon dioxide recovery, and in particular to an offshore platform self-generated carbon source CCUS device and process. Background Art

[0002] Under the current severe situation of global climate change, CCUS (Carbon Capture, Utilization and Storage) has attracted more and more attention as an effective means of carbon reduction. 2 Gas can reduce the viscosity of crude oil and the oil-water interfacial tension, expand the volume of crude oil, and achieve miscible displacement with crude oil under a specific pressure, thereby achieving the purpose of improving crude oil recovery. Shengli Oilfield, Daqing Oilfield, Jilin Oilfield, Xinjiang Oilfield, Changqing Oilfield, and Subei Oilfield are all developing CCUS technology in China, forming a series of supporting technologies. At present, many offshore oil and gas fields in Bohai, the eastern part of the South China Sea, and the western part of the South China Sea are actively exploring offshore oilfield CCUS business, but there is no mature technical solution yet.

[0003] Offshore oil and gas production platforms have small sites, limited areas, and high safety requirements, which brings great challenges to CCUS business. The main challenges are: 1. The CCUS process covers oil and gas separation devices, dehydration devices, dehydrogenation devices, capture devices, pressurization devices, etc. The process is complicated and the equipment occupies a large area. The space on the offshore platform is limited, and the process needs to be optimized to meet the requirements of offshore construction. For example, a CO 2 The circulating injection station covers an area of ​​more than 13,000 square meters, and it is difficult for offshore platforms to meet the requirements; 2. As CCUS business progresses, CCUS-affected wells CO 2 The output will be greatly increased, and the amount of gas source to be separated will fluctuate greatly during the entire CCUS business period, making it difficult to match the platform capture equipment; 3. The carbon source of the platform will increase significantly in the later stage of the project, and the CCUS project requires CO 2 Smooth injection to ensure oil recovery will lead to problems with carbon source matching. The excess CO 2 Unable to process.

[0004] At present, CCUS of offshore oil and gas fields at home and abroad is still in its infancy, mainly focusing on the marine transportation of carbon dioxide, safe release of carbon dioxide, injection string research and development, and parameter optimization. There are few reports on research plans for CCUS process design of offshore platform systems. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention proposes a safe, efficient and economically feasible offshore platform CCUS device and process.

[0006] The offshore platform CCUS device according to the present invention comprises: an oil-gas separator, a membrane separation device connected to the oil-gas separator, a first compression assembly and a second compression assembly arranged in parallel and connected to the outlet of the membrane separation device at the same time, and a bypass pipeline, wherein the first compression assembly is connected to the CCS storage well, the second compression assembly is connected to the CCUS receiving well, the inlet of the oil-gas separator is connected to the high-carbon gas source well, the outlet of the CCUS receiving well is connected to the inlet of the oil-gas separator, one end of the bypass pipeline is connected between the oil-gas separator and the membrane separation device, and the other end is connected to the membrane separation device. Between the separation device and the first compression assembly, wherein the offshore platform CCUS device is constructed to have a non-overload mode: the produced gas from the high-carbon gas source well and the CCUS receiving well passes through the oil-gas separator and the membrane separation device in sequence, and then enters the CCUS receiving well through the first compression assembly and / or the second compression assembly; and an overload mode: after the produced gas from the high-carbon gas source well and the CCUS receiving well passes through the oil-gas separator, a part of the produced gas enters the first compression assembly through the bypass pipeline and then enters the CCS storage well, and the other part enters the second compression assembly through the membrane separation device and then enters the CCUS receiving well.

[0007] Furthermore, a first shut-off valve, a first regulating valve, a first gas flowmeter and a second shut-off valve are sequentially arranged on the bypass pipeline, the membrane separation device is connected to the first compression assembly through the first pipeline, one end of the bypass pipeline is connected to the first pipeline, a third shut-off valve is arranged on the first pipeline, the first compression assembly is connected to the CCS storage well through the second pipeline, the second compression assembly is connected to the CCUS receiving well through the third pipeline, a fourth pipeline is connected between the second pipeline and the third pipeline, a fourth shut-off valve is arranged on the fourth pipeline, a normally closed stop valve is arranged in the area between the fourth shut-off valve and the CCS storage well on the second pipeline, in the overload mode, the first shut-off valve, the first regulating valve, the second shut-off valve and the normally closed stop valve are opened, and the third shut-off valve and the fourth shut-off valve are closed; in the non-overload mode, the first shut-off valve, the second shut-off valve and the normally closed stop valve are closed, and the third shut-off valve and the fourth shut-off valve are opened.

[0008] Furthermore, a gas sampling port is provided between the first gas flow meter and the second shut-off valve.

[0009] Furthermore, the oil-gas separator is connected to the membrane separation device through a fifth pipeline, on which a second gas flow meter, a second regulating valve and a third gas flow meter are sequentially arranged, and a bypass pipeline is connected to the area on the fifth pipeline located between the second gas flow meter and the second regulating valve.

[0010] Furthermore, the oil-gas separator is connected to the high-carbon gas source well through the sixth pipeline, and a first multiphase flowmeter is arranged on the sixth pipeline. The CCUS receiving well is connected to the sixth pipeline through the seventh pipeline, and a second multiphase flowmeter is arranged on the seventh pipeline. The first multiphase flowmeter is located at the front end of the connection between the seventh pipeline and the sixth pipeline.

[0011] Furthermore, a supercritical carbon dioxide flowmeter is also provided on the third pipeline to measure the CO injected into the CCUS receiving well. 2 Generosity.

[0012] Further, the first compression assembly includes at least two stages of compressors connected in series.

[0013] Furthermore, a molecular sieve dehydration device is connected between the compressors of adjacent stages.

[0014] Further, the second compression assembly is identical to the first compression assembly.

[0015] According to the offshore platform CCUS process of the present invention, the above-mentioned offshore platform CCUS device is applied, including: when the sum of the output gas volumes of the platform's high-carbon gas source wells and the CCUS receiving wells is less than or equal to the gas volume corresponding to the processing capacity of the membrane separation device, the offshore platform CCUS device is turned on in the non-overload mode; when the sum of the output gas volumes of the platform's high-carbon gas source wells and the CCUS receiving wells is greater than the gas volume corresponding to the processing capacity of the membrane separation device, the offshore platform CCUS device is turned on in the overload mode.

[0016] Compared with the prior art, the offshore platform CCUS device and process of the present invention has the following advantages:

[0017] 1) Scientific setting: The offshore platform CCUS device and process of the present invention focuses on the small offshore site, and can realize the whole process of carbon separation, compression and reinjection on a single platform, solving the problem of CO2 produced by CCUS wells. 2 After the breakthrough, the amount of gas to be processed on the ground increased, the carbon source fluctuated greatly, which caused equipment overload, and the adjustment of injection well process parameters caused CO 2 The problem of the consumption volume being lower than the gas source volume can be solved by effectively reducing equipment investment and meeting on-site application needs.

[0018] 2) Good economy: The offshore CCUS device and process of the present invention optimizes the offshore CCUS process flow for the platform's self-generated carbon source. 2 All are in gas phase conditions, with no phase change, which reduces equipment requirements and does not require additional energy consumption. The adoption of the seal-drive integrated design concept reduces the processing capacity requirements of the membrane separation device, which not only reduces the platform area requirements but also reduces equipment investment;

[0019] 3) Promote technological development: At present, offshore CCUS business has not been carried out in China. The present invention will help the subsequent offshore oil and gas fields to carry out CCUS business to optimize carbon sources and optimize process design, which will help promote the development of offshore CCUS business. It can also help the advancement of offshore CCUS technology under multiple modes such as ship transportation of carbon sources and pipeline transportation of carbon sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of an offshore platform CCUS device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0022] Figure 1 FIG. 1 shows the structure of an offshore platform CCUS device 100 according to an embodiment of the present invention. Figure 1 As shown, the offshore platform CCUS device 100 may include: an oil-gas separator 2, a membrane separation device 6 connected to the oil-gas separator 2, a first compression assembly 30 and a second compression assembly 40 arranged in parallel and connected to the outlet of the membrane separation device 6, and a bypass pipeline 13, the first compression assembly 30 is connected to a CCS storage well (Carbon Capture and storage, carbon capture and storage well) 60, the second compression assembly 40 is connected to a CCUS receiving well 70, the inlet of the oil-gas separator 2 is connected to a high-carbon gas source well 50, the outlet of the CCUS receiving well 70 is connected to the inlet of the oil-gas separator 2, one end of the bypass pipeline 13 is connected between the oil-gas separator 2 and the membrane separation device 6, and the other end is connected between the membrane separation device 6 and the first compression assembly 30, wherein the offshore platform CCUS device 100 is constructed to have a non-overload mode: the gas from the high-carbon gas source well 50 is connected to the high-carbon gas source well 50, and the outlet of the CCUS receiving well 70 is connected to the inlet of the oil-gas separator 2. The produced gas from the source well 50 and the CCUS receiving well 70 passes through the oil-gas separator 2 and the membrane separation device 6 in turn, and then enters the CCUS receiving well 70 through the first compression assembly 30 and / or the second compression assembly 40; and overload mode: after a part of the produced gas from the high-carbon gas source well 50 and the CCUS receiving well 70 passes through the oil-gas separator 2, enters the first compression assembly 30 through the bypass pipeline 13, and then enters the CCS storage well 60, and the other part enters the second compression assembly 40 through the membrane separation device 6 and then enters the CCUS receiving well 70.

[0023] In the offshore platform CCUS device of the embodiment of the present invention, considering the limited area of ​​the offshore platform, a membrane separation device 6 is provided according to the CCUS injection process parameter requirements to convert the CO produced by the inherent high-carbon gas source well 50 at sea into 2 Directly applied to the production of CCUS-receiving well 70, it can effectively increase CO 2 The utilization efficiency of CCUS effective well 70 is improved, and the production cost is reduced. At the same time, the gas produced in the production of CCUS effective well 70 enters the membrane separation device 6 for treatment through the oil-gas separator 2, and the separated high hydrocarbon gas enters the natural gas pipeline network, and the separated CO 2The gas is injected into the CCUS receiving well 70 again through the first compression assembly 30 and / or the second compression assembly 40. In the early stage of the CCUS project, the membrane separation device 6 can meet the load of the CCUS receiving well 70 and the output gas from the high-carbon gas source well 50. At this time, all CO 2 All of them can be injected into the CCUS receiving well 70 for production after being compressed by the first compression assembly 30 and / or the second compression assembly 40; in the later stage of the CCUS project, the output gas volume of the CCUS receiving well 70 is greatly increased, and the excess gas volume can be directly compressed and injected into the CCS storage well 60 without separation by the membrane separation device 6. Such a setting can simultaneously solve the problems of CCUS precise injection requirements, periodic fluctuations in offshore gas sources, and small offshore platform site areas. In order to have the ability to inject into the CCUS receiving well 70 and the CCS storage well 60 at the same time, the first compression assembly 30 and the second compression assembly 40 can be equipped according to the peak gas volume, that is, at the beginning of the project, the first compression assembly 30 and the second compression assembly 40 are used and the other is reserved, and the equipment can be fully loaded after reaching the peak gas volume.

[0024] The technical idea of ​​the present invention is to combine land CO 2 Based on the design principles of the circulating injection station and the current status of offshore oil and gas separation and decarbonization technology, the surface oil and gas separation, carbon separation, compression and injection processes were optimized. The integrated sealing and drive design concept was adopted, and two backup emergency pipelines were designed, one for direct compression injection into the CCUS effective well 70 after carbon source separation, and the other for direct injection of excess carbon source into the CCS storage well 60, which solved the problem of CO2 generation in the later stage of the CCUS project. 2 The increase in gas volume leads to overloading of membrane separation device 6 and platform CO 2 The gas source is higher than the designed injection volume, resulting in CO 2 It can solve difficult problems by carrying out CCUS operations in the limited space of offshore oil and gas platforms. At the same time, it can realize long-term full-load operation of equipment when the gas source and injection parameters fluctuate, thereby effectively reducing the investment in ground equipment and improving equipment utilization.

[0025] In such Figure 1In the preferred embodiment shown in the figure, the bypass pipeline 13 is provided with a first shut-off valve 16, a first regulating valve 17, a first gas flow meter 18 and a second shut-off valve 20 in sequence, the membrane separation device 6 is connected to the first compression assembly 30 through the first pipeline 102, one end of the bypass pipeline 13 is connected to the first pipeline 102, the first pipeline 102 is provided with a third shut-off valve 7, the first compression assembly 30 is connected to the CCS storage well 60 through the second pipeline 104, the second compression assembly 40 is connected to the CCUS receiving well 70 through the third pipeline 105, and the second pipeline 104 is connected to the third pipeline 106. A fourth pipeline 107 is connected between the three pipelines 105, and a fourth shut-off valve 11 is provided on the fourth pipeline 107. A normally closed stop valve 21 is provided in the area between the fourth shut-off valve 11 and the CCS storage well 60 on the second pipeline 104. In the overload mode, the first shut-off valve 16, the first regulating valve 17, the second shut-off valve 20 and the normally closed stop valve 21 are opened, and the third shut-off valve 7 and the fourth shut-off valve 11 are closed; in the non-overload mode, the first shut-off valve 16, the second shut-off valve 20 and the normally closed stop valve 21 are closed, and the third shut-off valve 7 and the fourth shut-off valve 11 are opened.

[0026] Preferably, if Figure 1 As shown, a gas sampling port 19 is also provided between the first gas flow meter 18 and the second shut-off valve 20. The gas sampling port 19 can be used to sample the gas that has not passed through the membrane separation device 6, and the CO in the gas sample can be obtained through indoor experiments. 2 Gas content, thus obtaining the CO stored in CCS wells 2 of gas content.

[0027] In such Figure 1 In the preferred embodiment shown, the oil-gas separator 2 is connected to the membrane separation device 6 through a fifth pipeline 108, on which the second gas flow meter 3, the second regulating valve 4 and the third gas flow meter 5 are sequentially arranged, and the bypass pipeline 13 is connected to the area between the second gas flow meter 3 and the second regulating valve 4 on the fifth pipeline 108. In this embodiment, the second gas flow meter 3 can obtain the gas that needs to be CO 2 The total amount of separated gas, if the gas volume is higher than the processing capacity of the membrane separation device 6, the overload mode is activated; if the gas volume is lower than the processing capacity of the membrane separation device 6, the unload mode is activated. The gas volume entering the membrane separation device 6 and the gas volume injected into the CCS storage well 60 after direct compression can be obtained by the third gas flow meter 5 and the first gas flow meter 18 respectively.

[0028] Furthermore, if Figure 1As shown, the oil-gas separator 2 is connected to the high-carbon gas source well 50 through the sixth pipeline 101, the sixth pipeline 101 is provided with a first multiphase flowmeter 1, the CCUS receiving well 70 is connected to the sixth pipeline 101 through the seventh pipeline 106, the seventh pipeline 106 is provided with a second multiphase flowmeter 22, and the first multiphase flowmeter 1 is located at the front end of the connection between the seventh pipeline 106 and the sixth pipeline 101. In this embodiment, the first multiphase flowmeter 1 is used to monitor the oil and gas output of the high-carbon gas source well 50, and the second multiphase flowmeter 22 is used to monitor the oil and gas output of the CCUS receiving well 70. The above two data can obtain the total amount of oil and gas to be processed by the oil-gas separator 2.

[0029] Furthermore, if Figure 1 As shown, a supercritical carbon dioxide flowmeter 15 is also provided on the third pipeline 105 for measuring the CO injected into the CCUS receiving well 70. 2 The supercritical carbon dioxide flowmeter 15 is used to measure the CO injected into the CCUS receiving well 70. 2 The second gas flowmeter 3 is combined with the supercritical carbon dioxide flowmeter 15 to obtain the CO stored in the CCS storage well 60. 2 Total amount.

[0030] According to the present invention, the first compression assembly 30 may include at least two compressors connected in series to increase the CO 2 Preferably, if Figure 1 As shown, a molecular sieve dehydration device 9 is also connected between the compressors of adjacent stages. The molecular sieve dehydration device 9 is used to reduce CO 2 The water content in the 2 corrosion properties.

[0031] In such Figure 1 In the preferred embodiment shown, the first compression assembly 30 may include a first compressor 8 and a second compressor 10 connected in series, and a molecular sieve dehydration device 9 is disposed between the first compressor 8 and the second compressor 10 .

[0032] Furthermore, if Figure 1 As shown, the second compression assembly 40 may be identical to the first compression assembly 30 .

[0033] The offshore platform CCUS process according to an embodiment of the present invention, using the above-mentioned offshore platform CCUS device 100, may include: when the sum of the output gas volumes of the platform high-carbon gas source well 50 and the CCUS receiving well 70 is less than or equal to the gas volume corresponding to the processing capacity of the membrane separation device 6, the offshore platform CCUS device 100 is turned on in the non-overload mode; when the sum of the output gas volumes of the platform high-carbon gas source well 50 and the CCUS receiving well 70 is greater than the gas volume corresponding to the processing capacity of the membrane separation device 6, the offshore platform CCUS device 100 is turned on in the overload mode.

[0034] In the offshore platform CCUS process of the embodiment of the present invention, when the oil and gas output of the platform (the sum of the output gas of the platform high carbon gas source well 50 and the CCUS effective well 70) is lower than the processing capacity of the membrane separation device 6 at the initial stage of the project, the oil and gas produced by the platform high carbon gas source well enters the oil and gas separator 2 for gas-liquid separation, the natural gas enters the membrane separation device 6, the separated high hydrocarbon gas enters the natural gas pipeline network, and the separated CO 2 The oil and gas produced by the CCUS receiving well 70 are injected into the CCUS receiving well 70 through the first compression assembly 30 and / or the second compression assembly 40. The oil and gas produced by the CCUS receiving well 70 enter the oil-gas separator 2 through the seventh pipeline 106 together with the oil and gas produced by the high-carbon gas source well 50, and enter the subsequent processing flow.

[0035] In the later stage of the project, when the gas output of the platform exceeds the processing capacity of the membrane separation device 6, the produced oil and gas are separated after passing through the oil-gas separator 2, and a part is used to be injected into the CCUS effective well 70, and the rest is used to be injected into the CCS storage well. By opening the first shut-off valve 16, the first regulating valve 17, the second shut-off valve 20 and the normally closed stop valve 21, closing the third shut-off valve 7 and the fourth shut-off valve 11, adjusting the opening of the first regulating valve 17 and the second regulating valve 4, the CO separated by the membrane separation device 6 is 2 The injection demand of the CCUS receiving well 70 is met and directly injected into the CCUS receiving well 70 through the second compression assembly 40 ; the remaining gas volume is injected into the CCS storage well 60 through the bypass pipeline 13 and the first compression assembly 30 .

[0036] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0037] In the description of this application, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An offshore platform CCUS device, characterized in that: include: An oil-gas separator, a membrane separation device connected to the oil-gas separator, a first compression assembly and a second compression assembly arranged in parallel and connected to the outlet of the membrane separation device at the same time, and a bypass pipeline, wherein the first compression assembly is connected to a CCS storage well, the second compression assembly is connected to a CCUS receiving well, the inlet of the oil-gas separator is connected to a high-carbon gas source well, the outlet of the CCUS receiving well is connected to the inlet of the oil-gas separator, one end of the bypass pipeline is connected between the oil-gas separator and the membrane separation device, and the other end is connected between the membrane separation device and the first compression assembly, wherein the offshore platform CCUS device is constructed to have a non-overload mode: the produced gas from the high-carbon gas source well and the CCUS receiving well passes through the oil-gas separator, the membrane separation device, and then enters the CCUS receiving well through the first compression assembly and / or the second compression assembly in sequence; And overload mode: after the produced gas from the high-carbon gas source well and the CCUS receiving well passes through the oil-gas separator, part of it enters the first compression component through the bypass pipeline and then enters the CCS storage well, and the other part enters the second compression component through the membrane separation device and then enters the CCUS receiving well.

2. The offshore platform CCUS device according to claim 1, characterized in that: The bypass pipeline is sequentially provided with a first shutoff valve, a first regulating valve, a first gas flowmeter and a second shutoff valve. The membrane separation device is connected to the first compression assembly through a first pipeline. One end of the bypass pipeline is connected to the first pipeline. The first pipeline is provided with a third shutoff valve. The first compression assembly is connected to the CCS storage well through a second pipeline. The second compression assembly is connected to the CCUS receiving well through a third pipeline. A fourth pipeline is connected between the second pipeline and the third pipeline. A fourth shutoff valve is provided on the fourth pipeline. A normally closed stop valve is provided in the area between the fourth shutoff valve and the CCS storage well on the second pipeline. In the overload mode, the first shutoff valve, the first regulating valve, the second shutoff valve and the normally closed stop valve are opened, and the third shutoff valve and the fourth shutoff valve are closed; in the non-overload mode, the first shutoff valve, the second shutoff valve and the normally closed stop valve are closed, and the third shutoff valve and the fourth shutoff valve are opened.

3. The offshore platform CCUS device according to claim 2, characterized in that: A gas sampling port is also provided between the first gas flow meter and the second shut-off valve.

4. The offshore platform CCUS device according to claim 2, characterized in that: The oil-gas separator is connected to the membrane separation device through a fifth pipeline, on which a second gas flow meter, a second regulating valve and a third gas flow meter are sequentially arranged, and the bypass pipeline is connected to the area on the fifth pipeline located between the second gas flow meter and the second regulating valve.

5. The offshore platform CCUS device according to claim 4, characterized in that: The oil-gas separator is connected to the high-carbon gas source well through a sixth pipeline, a first multiphase flowmeter is arranged on the sixth pipeline, the CCUS receiving well is connected to the sixth pipeline through a seventh pipeline, a second multiphase flowmeter is arranged on the seventh pipeline, and the first multiphase flowmeter is located at the front end of the connection between the seventh pipeline and the sixth pipeline.

6. The offshore platform CCUS device according to claim 5, characterized in that: The third pipeline is also provided with a supercritical carbon dioxide flowmeter for measuring the amount of CO2 gas injected into the CCUS receiving well.

7. The offshore platform CCUS device according to any one of claims 1 to 6, characterized in that: The first compression assembly includes at least two stages of compressors connected in series.

8. The offshore platform CCUS device according to claim 7, characterized in that: A molecular sieve dehydration device is also connected between the compressors of adjacent stages.

9. The offshore platform CCUS device according to claim 7, characterized in that: The second compression assembly is identical to the first compression assembly.

10. An offshore platform CCUS process, using the offshore platform CCUS device according to any one of claims 1 to 9, characterized in that: include: When the sum of the gas outputs of the platform's high-carbon gas source well and the CCUS receiving well is less than or equal to the gas volume corresponding to the processing capacity of the membrane separation device, the offshore platform CCUS device starts the non-overload mode; when the sum of the gas outputs of the platform's high-carbon gas source well and the CCUS receiving well is greater than the gas volume corresponding to the processing capacity of the membrane separation device, the offshore platform CCUS device starts the overload mode.

Images