Liquid carbon dioxide offshore jacket injection sequestration system

Abstract

The application discloses a liquid carbon dioxide offshore jacket type injection and storage system and relates to the field of carbon capture, which comprises CO2 submarine conveying pipelines, a CO2 receiving module, a CO2 filtering module, a CO2 leakage detection module, a CO2 heating module, a CO2 phase property monitoring module, a CO2 metering module and a CO2 injection manifold connected in sequence, wherein the CO2 injection manifold is connected to the submarine through an injection riser; the CO2 phase property monitoring module is further connected to a CO2 exhaust module through a branch pipeline, the CO2 exhaust module is connected to a CO2 reprocessing module, and the CO2 reprocessing module is connected to the CO2 heating module; the CO2 phase property monitoring module further extends a control signal line connected to the CO2 exhaust module; and the CO2 phase property monitoring module further extends a feedback signal line connected to the CO2 heating module. The application improves the high efficiency, safety and environmental protection of CO2 storage.

Description

Technical Field

[0001] This invention relates to the field of carbon capture, and more specifically, to a liquid carbon dioxide offshore jacketed injection and storage system. Background Technology

[0002] my country attaches great importance to the development of CCUS technology and has steadily promoted its onshore research and application. Oceanic carbon sequestration, compared to onshore carbon sequestration, has enormous potential, is farther from populated areas, and offers advantages in reliability and environmental friendliness. my country's main carbon emission sources are distributed along its coastal areas, and adjacent nearshore basins possess favorable conditions for carbon sequestration. With the development of domestic carbon tax policies and the carbon trading market, implementing marine CCUS will become even more economically feasible.

[0003] The Bohai Basin, with its relatively close offshore waters, is suitable for transporting CO2 via subsea pipelines to seabed storage sites, followed by injection and storage using an offshore injection and storage platform. However, research on CO2 storage in my country started relatively late, with seabed CO2 storage being a completely new area. Furthermore, pipeline-transported CO2 is predominantly in liquid form. Therefore, developing and designing an offshore liquid CO2 injection and storage platform for nearshore seabed CO2 storage is of significant practical importance for improving the CCUS (Concentrated Offshore Gas Storage and Storage) offshore industry value chain. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a liquid carbon dioxide marine jacket-type injection and storage system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A liquid carbon dioxide offshore jacketed injection and storage system includes a CO2 receiving module connected at the front end to a CO2 subsea pipeline, a CO2 receiving module connected at the rear end to the front end of a CO2 filtration module, a CO2 filtration module connected at the rear end to the front end of a CO2 leak detection module, a CO2 leak detection module connected at the rear end to the front end of a CO2 heating module, a CO2 heating module connected at the rear end to the front end of a CO2 phase monitoring module, a CO2 phase monitoring module connected at the rear end to the front end of a CO2 metering module, a CO2 metering module connected at the rear end to the front end of a CO2 injection manifold, and the rear end of the CO2 injection manifold connected to the seabed via an injection riser.

[0007] The CO2 phase monitoring module also has a branch pipe at the rear end connected to the front end of the CO2 exhaust module, the rear end of the CO2 exhaust module is connected to the front end of the CO2 reprocessing module, and the rear end of the CO2 reprocessing module is connected to the front end of the CO2 heating module.

[0008] The CO2 phase monitoring module also extends a control signal line to connect to the CO2 exhaust module;

[0009] The CO2 phase monitoring module also extends a feedback signal line to connect to the CO2 heating module.

[0010] The rear end of the CO2 exhaust module is also connected to the sea surface.

[0011] The CO2 subsea pipeline is also connected to a CO2 pigging receiver module at its rear end.

[0012] The system design temperature at the front end of the CO2 heating module is -30℃ to +30℃.

[0013] The system design temperature at the back end of the CO2 heating module is 0℃ to +30℃.

[0014] The sealing system is set up on a sealing platform, which is equipped with a platform auxiliary system.

[0015] The platform's auxiliary systems include living quarters, generator room, power distribution room, sewage treatment room, air compressor room, auxiliary equipment room, machine repair room, and fire pump room.

[0016] The following is a more detailed introduction:

[0017] CO2 receiving module: connected to the liquid CO2 subsea pipeline, used to receive liquid CO2;

[0018] CO2 filtration module: Connected to the CO2 receiving module, used to filter impurities in liquid CO2;

[0019] CO2 leak detection module: connected to the CO2 filter module, used to detect whether CO2 is leaking;

[0020] CO2 heating module: connected to the CO2 leak detection module, used to regulate the temperature of liquid CO2;

[0021] CO2 phase monitoring module: connected to the CO2 heating module, used to monitor the CO2 phase and send a signal back to the CO2 heating module, and send a control signal to the CO2 exhaust module;

[0022] CO2 metering module: connected to the CO2 phase monitoring module, used to meter the injected and sealed liquid CO2;

[0023] CO2 injection manifold: Connected to the CO2 metering module, used to distribute liquid CO2 to different wellheads on the seabed;

[0024] CO2 exhaust module: Connected to the CO2 phase monitoring module, it is used to release CO2 gas when the CO2 phase composition exceeds the standard. The gas can be directly discharged to the sea surface or reprocessed for reuse.

[0025] CO2 reprocessing module: Connected to the CO2 exhaust module, it reprocesses and liquefies the discharged CO2, and then returns it to the CO2 heating module;

[0026] CO2 pigging receiver module: Connected to the CO2 subsea pipeline, used to receive pigs launched from the shore.

[0027] Jacket platform auxiliary system: provides power, compressed air, sewage treatment, fire protection, etc. for the platform's functional modules.

[0028] Preferably, the design pressure of the liquid CO2 injection and storage system on the jacket platform is 150 bar; the system design temperature upstream (front end) of the CO2 heating module is -30℃ to +30℃, and the system design temperature downstream (back end) of the CO2 heating module is 0℃ to +30℃. Based on the three-phase characteristics of CO2, the phase state is determined by both pressure and temperature. At a pressure of 150 bar, the temperature is liquid within the range of -30℃ to +30℃, with only slight differences in density. The purpose of heating is: firstly, to maintain temperature stability and compensate for temperature losses in the front-end pipeline; most importantly, when injecting CO2 into the seabed storage target site through the injection riser, the drop in pressure and temperature can cause CO2 to freeze, potentially leading to pipeline blockage. Therefore, the temperature must be raised above 0℃ to avoid this phenomenon and improve system safety.

[0029] CO2 filtration modules prevent reservoir contamination. The received liquid CO2 may contain particles (such as rust dust) carried from pipelines. If these particles enter the reservoir, they can clog it, reduce its injectability, and even necessitate well rebuilding. These reservoirs are located in subsea storage sites, primarily abandoned subsea oil wells.

[0030] The CO2 phase monitoring module can send feedback signals to the CO2 heating unit (also known as the temperature control unit) based on the detection results. This means that the temperature of the liquid CO2 can also be adjusted to meet the phase requirements. When the gaseous components of the liquid CO2 exceed the standard, the CO2 phase monitoring module can also send a control signal to the CO2 exhaust module to discharge the gaseous components of CO2. When the liquid CO2 phase requirements are met, the CO2 phase monitoring module sends a control signal to the CO2 exhaust module to stop exhausting.

[0031] Under normal exhaust conditions, the CO2 exhaust module liquefies the CO2 through the CO2 reprocessing module and then returns it to the CO2 heating module for further injection and storage, thus achieving a more thorough green and environmentally friendly process. In emergency situations, the exhaust can be directly discharged to the sea surface through the discharge pipeline, reducing risks.

[0032] When a liquid CO2 subsea pipeline requires cleaning operations, the CO2 cleaning receiver module can be used to receive cleaning devices launched by onshore cleaning transmitters.

[0033] The advantages of this invention compared to existing technologies lie in its enhanced efficiency through a CO2 filtration module, the maintenance of a stable liquid phase for CO2 through a CO2 heating module and a CO2 phase monitoring module, improved safety through a CO2 exhaust module, and, most importantly, the reuse of CO2 exhaust gas through a CO2 reprocessing module, making it more environmentally friendly. The configuration of the CO2 pigging receiver module further facilitates the maintenance of CO2 subsea transport pipelines. Therefore, this invention provides an effective liquid CO2 offshore injection and storage system and platform solution for nearshore CO2 subsea storage, with significant application prospects. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the liquid CO2 injection and storage system of the present invention.

[0035] Figure 2 This is a front view of the liquid CO2 offshore jacketed injection and storage platform of the present invention.

[0036] Figure 3 This is a plan view of the bottom deck of the liquid CO2 offshore jacketed injection and storage platform of the present invention.

[0037] Figure 4 This is a plan view of the mid-deck of the liquid CO2 offshore jacketed injection and storage platform of the present invention.

[0038] In the figure, 1 is the baseline; 11 is the CO2 receiving module; 12 is the CO2 filtering module; 13 is the CO2 leakage detection module; 14 is the CO2 heating module; 15 is the CO2 phase monitoring module; 16 is the CO2 metering module; 17 is the CO2 injection manifold; 18 is the CO2 exhaust module; and 19 is the CO2 reprocessing module.

[0039] 20 CO2 pigging receiver module; 30 living area; 40 generator room; 41 power distribution room; 42 sewage treatment room; 43 air compressor room; 44 auxiliary equipment room; 45 machine repair room; 46 fire pump room; 50 injection riser. Detailed Implementation

[0040] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0041] Figure 1 This is a schematic diagram of a liquid CO2 injection and storage system, which mainly includes baseline 1. Specifically, it includes a CO2 receiving module 11, a CO2 filtering module 12, a CO2 leakage detection module 13, a CO2 heating module 14, a CO2 phase monitoring module 15, a CO2 metering module 16, and a CO2 injection manifold 17 connected in sequence. It can realize the reception, processing, injection and storage of liquid CO2 at the seabed target site, and the CO2 filtering module 12 can prevent contamination of the reservoir.

[0042] The CO2 phase monitoring module 15 can send a feedback signal to the CO2 heating unit 14 based on the detection results and adjust the temperature of the liquid CO2 to meet the phase requirements of the liquid CO2. When the gas phase component of the liquid CO2 exceeds the standard, the CO2 phase monitoring module 15 can also send a control signal to the CO2 exhaust module 18 to discharge the CO2 gas phase component. When the phase requirements of the liquid CO2 are met, the CO2 phase monitoring module 15 sends a control signal to the CO2 exhaust module 18 to stop the exhaust.

[0043] Under normal exhaust conditions, the CO2 exhaust module 18 can be liquefied by the CO2 reprocessing module and then returned to the CO2 heating module 14 for further injection and storage, thereby achieving a more thorough green and environmentally friendly process. In case of emergency, the CO2 exhaust module 18 can be discharged directly to the sea surface through the discharge pipe to reduce risks.

[0044] When a liquid CO2 subsea pipeline requires cleaning operations, the CO2 cleaning receiver module 20 can be used to receive cleaning equipment launched by a shore-based cleaning transmitter.

[0045] Figure 2 This is a front view of a liquid CO2 offshore jacketed injection and storage platform;

[0046] Figure 3 This is a plan view of the bottom deck of the liquid CO2 offshore jacketed injection and storage platform of the present invention;

[0047] Figure 4 This is a plan view of the middle deck of the liquid CO2 offshore jacketed injection and storage platform of the present invention.

[0048] Based on the concept of optimized layout, the following modules of the CO2 injection and storage system were rationally arranged: CO2 receiving module 11, CO2 filtering module 12, CO2 leakage detection module 13, CO2 heating module 14, CO2 phase monitoring module 15, CO2 metering module 16, CO2 injection manifold 17, CO2 exhaust module 18, CO2 reprocessing module 19, and CO2 pigging receiver module 20. In addition, the following auxiliary systems of the platform were rationally arranged: generator room 40, power distribution room 41, sewage treatment room 42, air compressor room 43, auxiliary equipment room 44, machine repair room 45, and fire pump room 46. The living area 30 and injection riser 50 were also rationally arranged.

[0049] This invention can receive liquid CO2 transported by subsea pipelines, and after processing the liquid CO2, safely, efficiently and reliably inject and seal the liquid CO2 into the target storage site on the seabed.

[0050] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A liquid carbon dioxide offshore jacket-type injection and storage system, characterized in that, The system includes a CO2 receiving module connected at its front end to a CO2 subsea pipeline, a CO2 receiving module connected at its rear end to the front end of a CO2 filtration module, a CO2 filtration module connected at its rear end to the front end of a CO2 leak detection module, a CO2 leak detection module connected at its rear end to the front end of a CO2 heating module, a CO2 heating module connected at its rear end to the front end of a CO2 phase monitoring module, a CO2 phase monitoring module connected at its rear end to the front end of a CO2 metering module, a CO2 metering module connected at its rear end to the front end of a CO2 injection manifold, and the rear end of the CO2 injection manifold connected to the seabed via an injection riser. The rear end of the CO2 phase monitoring module is also branched off and connected to the front end of the CO2 exhaust module. The rear end of the CO2 exhaust module is connected to the front end of the CO2 reprocessing module, and the rear end of the CO2 reprocessing module is connected to the front end of the CO2 heating module. The CO2 phase monitoring module also extends a control signal line to be connected to the CO2 exhaust module; The CO2 phase monitoring module also extends a feedback signal line to be connected to the CO2 heating module.

2. The liquid carbon dioxide offshore jacketed injection and storage system according to claim 1, characterized in that, The rear end of the CO2 exhaust module is also connected to the sea surface.

3. The liquid carbon dioxide offshore jacketed injection and storage system according to claim 1, characterized in that, The rear end of the CO2 subsea pipeline is also connected to a CO2 pigging receiver module.

4. The liquid carbon dioxide offshore jacketed injection and storage system according to claim 1, characterized in that, The system design temperature at the front end of the CO2 heating module is -30℃ to +30℃.

5. The liquid carbon dioxide offshore jacketed injection and storage system according to claim 1 or 4, characterized in that, The system design temperature at the back end of the CO2 heating module is 0℃ to +30℃.

6. The liquid carbon dioxide offshore jacketed injection and storage system according to claim 1, characterized in that, The sealing system is set on a sealing platform, and the sealing platform is equipped with a platform auxiliary system.

7. The liquid carbon dioxide offshore jacket-type injection and storage system according to claim 6, characterized in that, The platform's auxiliary system includes a living area, generator room, power distribution room, sewage treatment room, air compressor room, auxiliary equipment room, machine repair room, and fire pump room.

Images