Collection system of combustible ice based on carbon sequestration

Abstract

The invention provides a combustible ice collection system based on carbon sequestration, which comprises a supercritical carbon dioxide generation module, an injection module, a reservoir transformation module, a collection module, a conveying module and an anti-icing module, the supercritical carbon dioxide generation module is used for processing liquid carbon dioxide to generate supercritical carbon dioxide and storing the supercritical carbon dioxide. Supercritical carbon dioxide is injected into a combustible ice storage layer, so that methane in combustible ice is collected, meanwhile, carbon dioxide is sealed and stored, the mining efficiency and the safety degree of the combustible ice are improved, and the influence of carbon dioxide on the environment is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of marine natural gas hydrate exploitation, and in particular to a method and device for collecting combustible ice based on carbon sequestration. Background Art

[0002] Natural gas hydrate, also known as combustible ice, is a unique non-stoichiometric crystalline compound and one of the most abundant natural gas resources on Earth. Combustible ice is composed of water molecules connected by hydrogen bonds and gas molecules mainly composed of CH4, most of which are distributed in seabed sediments. Due to its huge methane reserves, high energy density and clean combustion, combustible ice is regarded as an important alternative energy source.

[0003] The depressurization method is considered the most feasible method for hydrate extraction. However, unlike conventional oil and gas resources, methane hydrate is buried in the seabed sediments in a solid form, which has a certain cementation and skeleton support effect on the sediment particles; in addition, the overlying layer of the methane hydrate reservoir is usually non-diagenetic, non-enclosed, and has the characteristics of high permeability. In the process of large-scale depressurization extraction, in addition to the possible danger of large-scale intrusion of overlying seawater, there may also be the decomposition phase change of methane hydrate that destroys the stability of the reservoir and overlying layer structure, causing geological and environmental disasters such as stratum collapse, submarine landslides, and methane leaks. The extraction efficiency and safety are poor. Summary of the invention

[0004] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, the first objective of the present application is to propose a methane hydrate collection system based on carbon sequestration.

[0006] The second objective of the present application is to provide an electronic device.

[0007] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a combustible ice collection system based on carbon sequestration, comprising:

[0008] Supercritical carbon dioxide generation module, injection module, reservoir transformation module, collection module, transportation module, anti-icing module;

[0009] The supercritical carbon dioxide generation module is used to process liquid carbon dioxide to generate supercritical carbon dioxide and store it;

[0010] The injection module is located above the combustible ice storage layer and is directly connected to the combustible ice storage layer through an injection pipeline, and is used to inject supercritical carbon dioxide into the combustible ice storage layer;

[0011] The reservoir transformation module is located inside the combustible ice storage layer, connected to the injection module, receives the injected supercritical carbon dioxide, and injects the supercritical carbon dioxide into the combustible ice storage layer to change the reservoir conditions;

[0012] The collection module is located at the outlet of the combustible ice storage layer, and is used to collect the combustible ice mixture released from the combustible ice storage layer and separate methane from the combustible ice mixture;

[0013] The transport module connects the collection module and the storage facility, and is used to transport the collected methane to the storage facility;

[0014] The anti-icing module is arranged on the conveying path of the conveying module to prevent the pipeline from being frozen and blocked.

[0015] Optionally, the system further comprises a safety assessment module, which is disposed at a key position in the system and is used to monitor and assess environmental data during the mining process and to issue safety warnings.

[0016] Optionally, the security assessment module includes:

[0017] The mining area environmental status monitoring module is used to monitor the temperature, pressure, methane concentration and seabed stability in the mining area;

[0018] Atmospheric environment data monitoring module, used to monitor atmospheric temperature, pressure, wind speed, wind direction parameters, methane and carbon dioxide content, ocean surface wave height, wind level parameters;

[0019] Seawater environment data monitoring module, used to monitor dissolved methane, carbon dioxide, temperature, salinity, pressure, dissolved oxygen, pH value, turbidity, chlorophyll, seawater flow velocity, flow direction parameters, and Doppler acoustic current information in seawater;

[0020] The seabed environment data monitoring module is used to monitor the deformation of the seabed topography, the temperature and pressure at each point on the seabed, and the methane and carbon dioxide content in the seawater on the seabed surface.

[0021] Optionally, the supercritical carbon dioxide generation module includes:

[0022] A liquid carbon dioxide storage device, used for storing liquid carbon dioxide and outputting the liquid carbon dioxide to the conversion module;

[0023] A conversion module, used to pressurize the liquid carbon dioxide to a preset pressure value through a booster pump, and heat it to a preset temperature to generate supercritical carbon dioxide;

[0024] The conversion monitoring module is arranged at the outlet of the conversion module and is used to monitor the pressure and temperature of the output carbon dioxide.

[0025] Optionally, the reservoir transformation module includes:

[0026] A control module, used to obtain the pressure data and temperature data of the conversion monitoring module, and control the switch state of the valve at the outlet of the conversion module according to the pressure data and temperature data, if the pressure data and temperature data both reach the preset threshold value, then open the valve to allow the supercritical carbon dioxide to be injected into the combustible ice storage layer; if the pressure data and temperature data do not reach the preset threshold value, then close the valve;

[0027] The displacement module is used to inject supercritical carbon dioxide into the combustible ice reservoir to replace methane.

[0028] Optionally, the collection module includes:

[0029] A gas collection module, used for collecting the combustible ice mixture output by the reservoir transformation module;

[0030] A separation module, used for performing a separation operation on the combustible ice mixture to separate gas and liquid;

[0031] A gas purification module, used to remove impurities from the separated gas to purify impurities other than methane in the gas;

[0032] Gas compression module for compressing methane gas.

[0033] To achieve the above-mentioned purpose, a second aspect of the present application provides an electronic device, comprising: a processor, and a memory communicatively connected to the processor;

[0034] The memory stores computer-executable instructions;

[0035] The processor executes the computer-executable instructions stored in the memory to implement the system as described in any one of the first aspects.

[0036] The present application provides a combustible ice collection system based on carbon sequestration. By injecting carbon dioxide into the combustible ice reservoir, carbon dioxide hydrates can be formed in the reservoir. Due to the pressure difference, methane hydrates will decompose into methane, which is convenient for continuous exploitation. The carbon dioxide replacement method is a win-win technology that achieves energy exploitation and greenhouse gas - carbon dioxide sequestration. This method can not only develop methane in hydrates, but also achieve carbon dioxide sequestration and reduce greenhouse gas emissions.

[0037] The carbon dioxide replacement method can make up for the "reservoir" that may become "hollow" due to the depressurization method, which may lead to the collapse of the seabed, submarine landslides, earthquakes and tsunamis. Supercritical carbon dioxide has a lower viscosity and density, which makes it easier to form a more complex fracture network, thereby increasing the permeability of the reservoir. Through the carbon dioxide replacement method, methane hydrate can be replaced and mined without destroying the hydrate structure, reducing damage to the deep-sea ecology and the impact on global climate change.

[0038] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0040] Figure 1 A schematic diagram of the structure of a combustible ice collection system based on carbon sequestration provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0042] To address this problem, the present application provides a system for collecting combustible ice based on carbon sequestration. Figure 1 This is a schematic diagram of the structure of a combustible ice collection system based on carbon sequestration provided in an embodiment of the present application. Figure 1 As shown, the system includes:

[0043] Supercritical carbon dioxide generation module 10, injection module 20, reservoir transformation module 30, collection module 40, transportation module 50, anti-icing module 60;

[0044] The supercritical carbon dioxide generation module 10 is used to process liquid carbon dioxide to generate supercritical carbon dioxide and store it;

[0045] The injection module 20 is located above the combustible ice storage layer and is directly connected to the combustible ice storage layer through an injection pipeline, and is used to inject supercritical carbon dioxide into the combustible ice storage layer;

[0046] The reservoir transformation module 30 is located inside the combustible ice storage layer, connected to the injection module 20, receives the injected supercritical carbon dioxide, and injects the supercritical carbon dioxide into the combustible ice storage layer to change the reservoir conditions;

[0047] The collecting module 40 is located at the outlet of the combustible ice storage layer, and is used to collect the combustible ice mixture released from the combustible ice storage layer and separate methane from the combustible ice mixture;

[0048] The transport module 50 is connected to the collection module 40 and the storage facility, and is used to transport the collected methane to the storage facility;

[0049] The anti-icing module 60 is disposed on the conveying path of the conveying module 50 to prevent the pipeline from being frozen and blocked.

[0050] In this embodiment, the injection module 20 is responsible for injecting supercritical carbon dioxide into the methane hydrate reservoir. This process can be achieved through hydraulic fracturing technology, which injects pressurized fluid to fracture the reservoir rock to form a fracture network, thereby increasing the permeability of the reservoir rock.

[0051] The transport module 50 transports the collected methane gas to a processing facility or storage point, which may include a composite material continuous pipe and a continuous pipe retracting and releasing mechanism for long-distance transport.

[0052] Optionally, the system further comprises a safety assessment module, which is disposed at a key position in the system and is used to monitor and assess environmental data during the mining process and to issue safety warnings.

[0053] Optionally, the security assessment module includes:

[0054] The mining area environmental status monitoring module is used to monitor the temperature, pressure, methane concentration and seabed stability in the mining area;

[0055] Atmospheric environment data monitoring module, used to monitor atmospheric temperature, pressure, wind speed, wind direction parameters, methane and carbon dioxide content, ocean surface wave height, wind level parameters;

[0056] Seawater environment data monitoring module, used to monitor dissolved methane, carbon dioxide, temperature, salinity, pressure, dissolved oxygen, pH value, turbidity, chlorophyll, seawater flow velocity, flow direction parameters, and Doppler acoustic current information in seawater;

[0057] The seabed environment data monitoring module is used to monitor the deformation of the seabed topography, the temperature and pressure at each point on the seabed, and the methane and carbon dioxide content in the seawater on the seabed surface.

[0058] In this embodiment, the area around the opening area is a high-frequency area for methane leakage. By installing a pressure sensor, the pressure of each vertical layer of the sediment can be obtained in real time to prevent wellbore damage and methane leakage caused by excessive pressure difference between layers. The seabed settlement monitor and methane sensor are used to monitor the occurrence of submarine landslide geological events and methane leakage events during the mining of combustible ice.

[0059] Optionally, the supercritical carbon dioxide generation module 10 includes:

[0060] A liquid carbon dioxide storage device, used for storing liquid carbon dioxide and outputting the liquid carbon dioxide to the conversion module;

[0061] A conversion module, used to pressurize the liquid carbon dioxide to a preset pressure value through a booster pump, and heat it to a preset temperature to generate supercritical carbon dioxide;

[0062] The conversion monitoring module is arranged at the outlet of the conversion module and is used to monitor the pressure and temperature of the output carbon dioxide.

[0063] In this embodiment, the industrial carbon dioxide cylinder is used to store liquid carbon dioxide, and the liquid carbon dioxide is transported to the liquid carbon dioxide storage tank through the supply pipeline and the carbon dioxide replenishment pump. The liquid carbon dioxide storage tank is responsible for long-term and safe storage of a sufficient amount of liquid carbon dioxide, and for providing a stable and continuous supply of carbon dioxide with a set temperature and pressure for the ultra-high pressure supercritical carbon dioxide generation part. The output end of the liquid carbon dioxide storage tank is provided with an output pipeline, which is pressurized to more than 100 MPa by a booster pump in turn, and then heated to 35°C by a heater to generate supercritical carbon dioxide.

[0064] Supercritical carbon dioxide (sCO2) refers to carbon dioxide fluid at a temperature and pressure exceeding its critical point. The critical temperature of carbon dioxide is 31.26°C and the critical pressure is 72.9atm (about 7.38MPa). In the supercritical state, carbon dioxide exhibits unique physical and chemical properties that have both gaseous and liquid properties:

[0065] 1. Density: The density of supercritical carbon dioxide is close to that of liquid, which makes it have strong dissolving ability.

[0066] 2. Viscosity and diffusivity: Its viscosity is close to that of gas, and its diffusion coefficient is 100 times that of liquid, so it has amazing solubility and good flow and transfer properties.

[0067] 3. Surface tension: The surface tension is very small, almost close to 0, which allows it to penetrate into porous materials more easily.

[0068] 4. Thermal conductivity: greater than normal pressure gas, which makes it more efficient in heat transfer.

[0069] 5. Solvent properties: The dielectric constant of supercritical carbon dioxide changes dramatically with pressure. By controlling the temperature and pressure of supercritical carbon dioxide, its density and solvent properties can be easily changed, making it widely used in chemical reactions and separations.

[0070] 6. Environmentally friendly: Carbon dioxide is chemically inactive, colorless, odorless, non-toxic, safe, cheap, high-purity and easy to obtain.

[0071] 7. Wide application: Supercritical carbon dioxide is widely used in industry in supercritical fluid extraction, polymerization reaction, particle manufacturing, environmental governance, chemical reaction and energy saving. Especially in supercritical fluid extraction (SFE), due to its strong dissolving ability, high extraction ability, simple separation process and no residue, it is widely used in food, medicine, fragrance and chemical industry.

[0072] Supercritical carbon dioxide has lower viscosity and density, which makes it easier to form a more complex fracture network, thereby increasing the permeability of the reservoir. Injecting supercritical carbon dioxide into the methane hydrate reservoir can form carbon dioxide hydrate in the reservoir. Due to the pressure difference, methane hydrate will decompose into methane, facilitating continuous exploitation.

[0073] Optionally, the reservoir transformation module 30 includes:

[0074] A control module, used to obtain the pressure data and temperature data of the conversion monitoring module, and control the switch state of the valve at the outlet of the conversion module according to the pressure data and temperature data, if the pressure data and temperature data both reach the preset threshold value, then open the valve to allow the supercritical carbon dioxide to be injected into the combustible ice storage layer; if the pressure data and temperature data do not reach the preset threshold value, then close the valve;

[0075] The displacement module is used to inject supercritical carbon dioxide into the combustible ice reservoir to replace methane.

[0076] In this embodiment, a system pressure sensor and a system temperature sensor are provided on the output pipeline to measure the pressure and temperature of the output supercritical carbon dioxide to ensure that it reaches a supercritical state. If the carbon dioxide does not reach a supercritical state, the output of carbon dioxide is stopped. When the pressure reaches 100 MPa and the temperature reaches 35°C, the valve is opened to output supercritical carbon dioxide.

[0077] Optionally, the collection module 40 includes:

[0078] A gas collection module, used for collecting the combustible ice mixture output by the reservoir transformation module 30;

[0079] A separation module, used for performing a separation operation on the combustible ice mixture to separate gas and liquid;

[0080] A gas purification module, used to remove impurities from the separated gas to purify impurities other than methane in the gas;

[0081] Gas compression module for compressing methane gas.

[0082] In this embodiment, the combustible ice mixture contains gas and liquid, in which methane exists in the form of gas, so the liquid is directly separated out. The remaining gas contains not only methane, but also impurities such as hydrogen sulfide and carbon dioxide, so these impurities need to be removed by a gas purification module.

[0083] For hydrogen sulfide, dry desulfurization processes can be used, including iron oxide method, activated carbon method (catalytic impregnated activated carbon, impregnated activated carbon, non-impregnated activated carbon), molecular sieve method, etc. These methods remove hydrogen sulfide through physical adsorption. Wet desulfurization can also be used, using a specific solvent to contact the raw gas to remove hydrogen sulfide. This method is suitable for crude desulfurization with large gas volume and high sulfur content, but the purification accuracy is worse than the dry method.

[0084] For carbon dioxide, a refrigeration system is used to cool the mixed gas. Since the freezing point of carbon dioxide is higher than that of methane, it is condensed first and thus separated.

[0085] In order to implement the above embodiments, the present application also proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the system provided by the above embodiments.

[0086] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the system provided by the above embodiments.

[0087] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the system provided by the above embodiments when executed by a processor.

[0088] The collection, storage, use, processing, transmission, provision and disclosure of user personal information involved in this application are in compliance with relevant laws and regulations and do not violate public order and good morals.

[0089] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0090] The present application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, the present disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0091] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0092] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0093] Any process or system description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0094] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0095] It should be understood that the various parts of the present application can be implemented with hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or systems can be implemented with software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented with hardware, as in another embodiment, it can be implemented with any one of the following technologies known in the art or their combination: a discrete logic circuit with a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit with a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0096] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0097] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0098] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A combustible ice collection system based on carbon sequestration, characterized in that: include: Supercritical carbon dioxide generation module, injection module, reservoir transformation module, collection module, transportation module, anti-icing module; The supercritical carbon dioxide generation module is used to process liquid carbon dioxide to generate supercritical carbon dioxide and store it; The injection module is located above the combustible ice storage layer and is directly connected to the combustible ice storage layer through an injection pipeline, and is used to inject supercritical carbon dioxide into the combustible ice storage layer; The reservoir transformation module is located inside the combustible ice storage layer, connected to the injection module, receives the injected supercritical carbon dioxide, and injects the supercritical carbon dioxide into the combustible ice storage layer to change the reservoir conditions; The collection module is located at the outlet of the combustible ice storage layer, and is used to collect the combustible ice mixture released from the combustible ice storage layer and separate methane from the combustible ice mixture; The transport module connects the collection module and the storage facility, and is used to transport the collected methane to the storage facility; The anti-icing module is arranged on the conveying path of the conveying module to prevent the pipeline from being frozen and blocked.

2. The system according to claim 1, characterized in that The system also includes a safety assessment module, which is arranged at a key position in the system and is used to monitor and assess environmental data during the mining process and to issue safety warnings.

3. The system according to claim 2, characterized in that The safety assessment module includes: The mining area environmental status monitoring module is used to monitor the temperature, pressure, methane concentration and seabed stability in the mining area; Atmospheric environment data monitoring module, used to monitor atmospheric temperature, pressure, wind speed, wind direction parameters, methane and carbon dioxide content, ocean surface wave height, wind level parameters; Seawater environment data monitoring module, used to monitor dissolved methane, carbon dioxide, temperature, salinity, pressure, dissolved oxygen, pH value, turbidity, chlorophyll, seawater flow velocity, flow direction parameters, and Doppler acoustic current information in seawater; The seabed environment data monitoring module is used to monitor the deformation of the seabed topography, the temperature and pressure at each point on the seabed, and the methane and carbon dioxide content in the seawater on the seabed surface.

4. The system according to claim 3, characterized in that The supercritical carbon dioxide generation module comprises: A liquid carbon dioxide storage device, used for storing liquid carbon dioxide and outputting the liquid carbon dioxide to the conversion module; A conversion module, used to pressurize the liquid carbon dioxide to a preset pressure value through a booster pump, and heat it to a preset temperature to generate supercritical carbon dioxide; The conversion monitoring module is arranged at the outlet of the conversion module and is used to monitor the pressure and temperature of the output carbon dioxide.

5. The system according to claim 4, characterized in that The reservoir transformation module comprises: A control module, used to obtain the pressure data and temperature data of the conversion monitoring module, and control the switch state of the valve at the outlet of the conversion module according to the pressure data and temperature data, if the pressure data and temperature data both reach the preset threshold value, then open the valve to allow the supercritical carbon dioxide to be injected into the combustible ice storage layer; if the pressure data and temperature data do not reach the preset threshold value, then close the valve; The displacement module is used to inject supercritical carbon dioxide into the combustible ice reservoir to replace methane.

6. The system according to claim 5, characterized in that The collection module comprises: A gas collection module, used for collecting the combustible ice mixture output by the reservoir transformation module; A separation module, used for performing a separation operation on the combustible ice mixture to separate gas and liquid; A gas purification module, used to remove impurities from the separated gas to purify impurities other than methane in the gas; Gas compression module for compressing methane gas.

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