A gas reservoir screening method and system based on in-situ hydrogen production through combustion self-heating

Abstract

This invention discloses a gas reservoir screening method and system based on in-situ hydrogen production through combustion self-heating, relating to the field of oil and gas field development technology. The method includes: acquiring gas reservoir parameters corresponding to each candidate gas reservoir, wherein the gas reservoir parameters include at least combustion enthalpy change, geological parameters, and rock thermodynamic parameters; calculating the natural gas combustion heat release of each candidate gas reservoir based on its corresponding gas reservoir parameters, and identifying the candidate gas reservoirs that meet a first preset condition for natural gas combustion heat release as candidate gas reservoirs; effectively screening gas reservoirs suitable for in-situ hydrogen production through combustion self-heating, thus promoting the technology of in-situ hydrogen production through combustion self-heating. The method used in this scheme not only standardizes the screening of in-situ hydrogen production through combustion self-heating but also provides development strategies for in-situ hydrogen production through combustion self-heating, possessing significant theoretical and practical implications.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field development technology, and more specifically, to a gas reservoir screening method and system based on in-situ hydrogen production through combustion self-heating. Background Technology

[0002] Natural gas is an important low-carbon energy source, and improving recovery rate and development efficiency is a current hot topic. However, most natural gas reservoirs have edge water or bottom water. As gas reservoir development progresses, edge and bottom water advances rapidly, and water flooding begins to occur in and around the gas well, which will seriously affect the recovery rate of the gas reservoir.

[0003] Hydrogen is considered a major future energy source due to its high calorific value and lack of pollution. Natural gas hydrogen production mainly employs methods such as steam redistillation and partial oxidation. Currently, in-situ hydrogen production technology from hydrocarbon reservoirs has received widespread attention. The publicly disclosed invention for in-situ hydrogen production from oil and gas reservoirs is "In-situ process for producing syngas from underground hydrocarbon reservoirs" (Patent No.: 201780014999.7). However, no literature currently mentions screening methods for gas reservoirs suitable for hydrogen production.

[0004] Although there has been considerable research on in-situ hydrogen production processes in oil and gas reservoirs both domestically and internationally, theoretical understanding of its development is limited. Therefore, there is an urgent need to conduct research on in-situ hydrogen production through air injection combustion self-heating in gas reservoirs. As a crucial component of this research, the selection criteria for self-heating gas reservoirs are key indicators influencing and restricting the application scope and effectiveness of this technology. However, currently, suitable selection criteria for self-heating gas reservoirs are lacking, severely hindering the widespread application of in-situ hydrogen production through combustion self-heating in gas reservoirs.

[0005] Therefore, providing a gas reservoir screening method suitable for in-situ hydrogen production through combustion self-heating has become one of the technical problems that urgently need to be solved in this field. Summary of the Invention

[0006] The purpose of this invention is to provide a gas reservoir screening method and system based on combustion self-heating in-situ hydrogen production, which can effectively screen out gas reservoirs suitable for combustion self-heating in-situ hydrogen production and promote the application of gas reservoir combustion self-heating in-situ hydrogen production technology.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0008] In a first aspect, embodiments of this application provide a gas reservoir screening method based on in-situ hydrogen production through combustion self-heating, comprising the following steps:

[0009] Obtain the gas reservoir parameters corresponding to each candidate gas reservoir. The gas reservoir parameters include at least combustion enthalpy change, geological parameters, and rock thermodynamic parameters.

[0010] Based on the gas reservoir parameters corresponding to each candidate gas reservoir, the heat release of natural gas combustion in each candidate gas reservoir is calculated, and the candidate gas reservoirs that meet the first preset condition for heat release of natural gas combustion are identified as candidate gas reservoirs.

[0011] The beneficial effects of this invention are as follows: Addressing the current lack of suitable screening criteria for in-situ hydrogen production through combustion self-heating, this solution establishes suitable gas reservoir screening criteria by clearly defining the combustion self-heating temperature of the gas reservoir. Gas reservoirs with a combustion self-heating temperature greater than 450°C are used as screening conditions; that is, gas reservoirs with a temperature greater than 450°C can be considered as the first preset condition. Therefore, it is first determined whether the heat per unit volume of the gas reservoir can heat the reservoir to 450°C. The method used in this solution not only standardizes the screening of in-situ hydrogen production through combustion self-heating but also provides a development strategy for in-situ hydrogen production through combustion self-heating, which has significant theoretical and practical implications.

[0012] Based on the above technical solution, the present invention can be further improved as follows.

[0013] Furthermore, the above methods also include:

[0014] Based on the detailed gas reservoir data of each candidate gas reservoir, the candidate gas reservoirs are subjected to historical fitting processing to obtain the historical fitting result of each candidate gas reservoir. Based on each historical fitting result, the candidate gas wells that meet the second preset condition among the candidate gas wells of the corresponding candidate gas reservoir are determined as candidate gas wells.

[0015] Numerical simulations are performed on the candidate gas wells based on their parameters to obtain the numerical simulation results for each candidate gas well. The candidate gas wells whose numerical simulation results meet the third preset condition are then identified as the target gas wells.

[0016] The beneficial effects of adopting the above-mentioned further scheme are: after obtaining candidate gas reservoirs through screening, the above scheme can also be used to screen multiple gas wells in the candidate gas reservoirs to obtain the hydrogen production of each gas well in each candidate gas reservoir, thereby further refining the candidate gas reservoirs and clarifying the suitability of adopting the self-heating in-situ hydrogen production method for each gas well.

[0017] Furthermore, the aforementioned geological parameters include at least gas reservoir porosity, pressure, and gas saturation; the rock thermodynamic parameters include at least rock heat capacity.

[0018] The beneficial effect of adopting the above-mentioned further scheme is that by calculating the temperature that can be achieved by self-heating through multiple parameters of the gas reservoir, i.e. the heat release of natural gas combustion, the calculation results can be more accurate and more valuable for reference.

[0019] Furthermore, the heat release from the combustion of natural gas described above is expressed by the first formula, which is:

[0020]

[0021] In the formula, T1 represents the heat released by natural gas combustion, P represents the pressure of the gas reservoir, ΔH represents the enthalpy change of combustion, φ represents the porosity of the gas reservoir, and S g P0 represents atmospheric pressure, and V represents gas saturation. m C represents the standard gas molar volume constant. w C represents the specific heat capacity of water. r T0 represents the initial temperature of the gas reservoir, where T represents the heat capacity of the rock.

[0022] Furthermore, the above-mentioned historical fitting process is performed on the candidate gas reservoirs based on the detailed gas reservoir data of each candidate gas reservoir to obtain the historical fitting result for each candidate gas reservoir. Based on each historical fitting result, the candidate gas wells that meet the second preset condition among the candidate gas wells of the corresponding candidate gas reservoir are determined as candidate gas wells, including:

[0023] Based on the reservoir detailed description report and production dynamic data of each candidate gas reservoir, and based on the modeling software Petrel, a geological model corresponding to each candidate gas reservoir is established. The detailed gas reservoir data includes the reservoir detailed description report and production dynamic data.

[0024] Historical fitting was performed on each geological model to obtain the average water saturation of each candidate gas well in each candidate gas reservoir;

[0025] Gas wells that meet the second preset condition are identified as candidate gas wells.

[0026] Furthermore, the above-mentioned numerical simulation processing of candidate gas wells based on the gas well parameters of each candidate gas well yields numerical simulation results for each candidate gas well. Candidate gas wells whose numerical simulation results meet the third preset condition are then identified as target gas wells, including:

[0027] The CMG-Stars software was used to conduct numerical simulations of in-situ hydrogen production through combustion self-heating on the well parameters of each candidate gas well, and the molar percentage of hydrogen production for each candidate gas well was obtained.

[0028] Candidate gas wells that meet the third preset condition are identified as target gas wells.

[0029] Furthermore, the numerical simulation process described above includes at least multiple combustion reactions, multiple hydrogen production reactions, and multiple hydrogen consumption reactions.

[0030] The combustion reactions are: CH4 + 2O2 = CO2 + 2H2O, CH4 + 1.5O2 = CO + 2H2O, CO + 0.5O2 = CO2;

[0031] Several hydrogen production reactions are: CH4 + 0.5O2 = CO + 2H2, CH4 + H2O = CO + 3H2, CO + H2O = CO2 + H2;

[0032] Several hydrogen-consuming reactions are: H2 + 0.5O2 = H2O, CO2 + H2 = CO + H2O.

[0033] The beneficial effects of adopting the above-mentioned further scheme are: it comprehensively considers multiple reactions concerning the origin and destination of hydrogen in numerical simulation, making the numerical simulation closer to the real environment, and ultimately obtaining more accurate hydrogen production and the molar ratio of hydrogen production.

[0034] Furthermore, the first preset condition mentioned above is that the self-heating temperature of the gas reservoir is not lower than 450°C.

[0035] Furthermore, the second preset condition mentioned above is that the current water saturation of the candidate gas well is not greater than 0.5.

[0036] Furthermore, the third preset condition mentioned above is that the simulated hydrogen production molar ratio of the target gas well is not less than 20%.

[0037] Secondly, embodiments of this application provide a gas reservoir screening system based on combustion self-heating in-situ hydrogen production, applied to any of the gas reservoir screening methods based on combustion self-heating in-situ hydrogen production in the first aspect, including:

[0038] The parameter acquisition module is used to acquire the gas reservoir parameters corresponding to each candidate gas reservoir. The gas reservoir parameters include at least combustion enthalpy change, geological parameters and rock thermodynamic parameters.

[0039] The gas reservoir screening module is used to calculate the natural gas combustion heat release of each candidate gas reservoir based on the gas reservoir parameters corresponding to each candidate gas reservoir, and to identify the candidate gas reservoirs that meet the first preset condition for natural gas combustion heat release as candidate gas reservoirs.

[0040] Thirdly, embodiments of this application provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method of any one of the first aspects.

[0041] Fourthly, embodiments of this application provide a non-transitory computer-readable storage medium that stores computer instructions that cause a computer to perform any of the methods in the first aspect.

[0042] Compared with the prior art, the present invention has at least the following beneficial effects:

[0043] This application addresses the current lack of suitable screening criteria for in-situ hydrogen production through combustion self-heating. It establishes screening criteria for gas reservoirs suitable for this method by specifying the combustion self-heating temperature. Gas reservoirs with a combustion self-heating temperature greater than 450℃ are used as screening conditions. Therefore, the first step is to determine whether the heat per unit volume of the gas reservoir can heat the reservoir to 450℃. The method used in this scheme not only standardizes the screening of in-situ hydrogen production through combustion self-heating but also provides a development strategy for in-situ hydrogen production through combustion self-heating, which has significant theoretical and practical implications.

[0044] In this application, after selecting candidate gas reservoirs, multiple gas wells in the candidate gas reservoirs are further screened to obtain the hydrogen production of each gas well in each candidate gas reservoir, thereby further refining the candidate gas reservoirs and clarifying the suitability of using the self-heating in-situ hydrogen production method for each gas well in each candidate gas reservoir. Attached Figure Description

[0045] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0046] Figure 1 This is a screening diagram of various parameters in an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of each reaction in the in-situ hydrogen production in the embodiments of the present invention;

[0048] Figure 3 This is a histogram showing the molar percentage of hydrogen production in embodiments of the present invention;

[0049] Figure 4 This is a flowchart of the screening method in an embodiment of the present invention;

[0050] Figure 5 This is a schematic diagram of the connection of the screening system in an embodiment of the present invention;

[0051] Figure 6 This is a schematic diagram of the connection of an electronic device in an embodiment of the present invention. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0053] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0054] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0055] In the description of the embodiments of the present invention, "multiple" means at least two.

[0056] Example 1

[0057] This embodiment provides a gas reservoir screening method based on in-situ hydrogen production through combustion self-heating, such as... Figure 4 As shown, it includes the following steps:

[0058] S1, obtain the gas reservoir parameters corresponding to each candidate gas reservoir. The gas reservoir parameters include at least combustion enthalpy change, geological parameters and rock thermodynamic parameters.

[0059] The geological parameters obtained may include gas reservoir porosity, pressure, gas saturation, permeability, temperature, reservoir heat capacity, and thermal conductivity; the thermodynamic parameters of the gas reservoir rock are the target gas reservoir rock heat capacity and thermal conductivity.

[0060] Optionally, the above geological parameters include at least gas reservoir porosity, pressure, and gas saturation; the rock thermodynamic parameters include at least rock heat capacity.

[0061] S2, calculate the natural gas combustion heat release of each candidate gas reservoir based on the gas reservoir parameters corresponding to each candidate gas reservoir, and determine the candidate gas reservoir that meets the first preset condition for natural gas combustion heat release as a candidate gas reservoir.

[0062] Specifically, based on the various data in the gas reservoir parameters, relevant calculations can be performed to obtain the natural gas combustion heat release corresponding to each candidate gas reservoir, that is, the temperature that the self-heating can reach for each candidate gas reservoir, and this temperature data is used as a condition for screening candidate gas reservoirs; for details, see Figure 1 Since self-heating requires a temperature of 450°C to achieve in-situ hydrogen production, the first preset condition can be set to a temperature greater than 450°C for natural gas combustion heat release.

[0063] Optionally, the heat release from the combustion of natural gas described above is expressed by a first formula, which is:

[0064]

[0065] In the formula, T1 represents the heat released by natural gas combustion, P represents the pressure of the gas reservoir, ΔH represents the enthalpy change of combustion, φ represents the porosity of the gas reservoir, and S g P0 represents atmospheric pressure, and V represents gas saturation. m C represents the standard gas molar volume constant. w C represents the specific heat capacity of water. r T0 represents the initial temperature of the gas reservoir, where T represents the heat capacity of the rock.

[0066] Optionally, the above methods also include:

[0067] S3. Based on the detailed gas reservoir data of each candidate gas reservoir, perform historical fitting processing on the candidate gas reservoir to obtain the historical fitting result of each candidate gas reservoir. Based on each historical fitting result, determine the candidate gas wells that meet the second preset conditions among the candidate gas wells of the corresponding candidate gas reservoir as candidate gas wells.

[0068] When performing historical fitting on candidate gas reservoirs based on detailed reservoir data, this can be done using Petrel, a mainstream modeling software in the oil and gas industry. Specifically, firstly, detailed reservoir data needs to be obtained. This data includes a detailed reservoir description report and production dynamic data. The detailed reservoir description report includes parameters such as gas-water distribution, reservoir pressure, and gas saturation. The production dynamic data includes parameters such as reservoir production history, well opening history, and operational history. It may also include sedimentary facies data and well logging data. Based on these parameters, a geological model corresponding to the candidate gas reservoir is established. When performing historical fitting on the historical model, the average water saturation in the historical fitting results can be used as a screening criterion for candidate gas wells.

[0069] Optionally, the above-mentioned historical fitting process is performed on the candidate gas reservoirs based on the detailed gas reservoir data of each candidate gas reservoir to obtain the historical fitting result for each candidate gas reservoir. Based on each historical fitting result, the candidate gas wells that meet the second preset condition among the candidate gas wells of the corresponding candidate gas reservoir are determined as candidate gas wells, including:

[0070] Based on the reservoir detailed description report and production dynamic data of each candidate gas reservoir, and based on the modeling software Petrel, a geological model corresponding to each candidate gas reservoir is established. The detailed gas reservoir data includes the reservoir detailed description report and production dynamic data.

[0071] Historical fitting was performed on each geological model to obtain the average water saturation of each candidate gas well in each candidate gas reservoir;

[0072] Gas wells that meet the second preset condition are identified as candidate gas wells.

[0073] S4. Perform numerical simulation processing on the candidate gas wells according to the gas well parameters of each candidate gas well to obtain the numerical simulation results of each candidate gas well, and determine the candidate gas wells that meet the numerical simulation results of the third preset condition as the target gas wells.

[0074] In addition to screening candidate gas reservoirs, the above scheme can be used to screen multiple gas wells in the candidate gas reservoirs to obtain the hydrogen production of each gas well in each candidate gas reservoir, thereby further refining the candidate gas reservoirs and clarifying the suitability of using the self-heating in-situ hydrogen production method for each gas well.

[0075] Optionally, the above-mentioned numerical simulation processing of candidate gas wells based on the gas well parameters of each candidate gas well is performed to obtain the numerical simulation results of each candidate gas well, and the candidate gas wells whose numerical simulation results meet the third preset condition are determined as target gas wells, including:

[0076] The CMG-Stars software was used to conduct numerical simulations of in-situ hydrogen production through combustion self-heating on the well parameters of each candidate gas well, and the molar percentage of hydrogen production for each candidate gas well was obtained.

[0077] Candidate gas wells that meet the third preset condition are identified as target gas wells.

[0078] Numerical simulation processing can be achieved using CMG-Stars, a mainstream thermal recovery software in the oil and gas industry. After obtaining the hydrogen production of each candidate gas well in each candidate gas reservoir, the molar percentage of hydrogen production of each candidate gas well can be obtained. Each candidate gas well is ranked according to its molar percentage of hydrogen production, which serves as the basis for judging the suitability of in-situ hydrogen production in the gas reservoir and gas well. Specifically, at least 20% of the candidate gas wells can be identified as target gas wells, and the third preset condition is that at least 20% of the candidate gas wells are selected.

[0079] Optionally, the numerical simulation process described above includes at least multiple combustion reactions, multiple hydrogen production reactions, and multiple hydrogen consumption reactions.

[0080] The combustion reactions are: CH4 + 2O2 = CO2 + 2H2O, CH4 + 1.5O2 = CO + 2H2O, CO + 0.5O2 = CO2;

[0081] Several hydrogen production reactions are: CH4 + 0.5O2 = CO + 2H2, CH4 + H2O = CO + 3H2, CO + H2O = CO2 + H2;

[0082] Several hydrogen-consuming reactions are: H2 + 0.5O2 = H2O, CO2 + H2 = CO + H2O.

[0083] In particular, multiple reactions concerning the origin and destination of hydrogen were comprehensively considered in the numerical simulation, making the numerical simulation closer to the real environment, and ultimately obtaining more accurate hydrogen production and the molar ratio of hydrogen production.

[0084] Specifically, the various chemical reactions related to the origin and destination of hydrogen will be comprehensively considered, as hydrogen undergoes multiple chemical reactions in the environment where the gas reservoir is located, such as... Figure 2 As shown, considering all these reactions in the numerical simulation can make the final numerical simulation results more realistic and thus more valuable for reference.

[0085] Specifically, taking a gas reservoir in the Southwest Oil and Gas Field as an example, the reservoir was put into production using horizontal well volumetric fracturing. The reservoir has a matrix porosity of 0.1, permeability of 0.01 mD, reservoir pressure of 20 MPa, and gas saturation of 0.8. The average porosity of the fracturing zone is 0.225. Using the first formula, the reservoir heating temperature can be calculated, revealing a combustion heating temperature of 603.6℃ in the fracturing zone, which is greater than 450℃ and meets the conditions for in-situ hydrogen production. Further detailed description data and production history data of the reservoir were obtained to construct a geological model. Historical data fitting was conducted; after fitting, the gas-water distribution characteristics were obtained. Three gas wells with a water saturation of less than 0.5 were selected, and their gas-water distribution characteristics were no bottom water intrusion, bottom water intrusion at the bottom of the fracturing section, and bottom water intrusion in the middle of the fracturing section, respectively. The CMG-Stars module was used to conduct numerical simulations of in-situ hydrogen production through self-combustion heating on the three candidate gas wells. The simulation results showed that the hydrogen production molar fractions of the three gas wells with no bottom water intrusion, bottom water intrusion at the bottom of the fracturing section, and bottom water intrusion in the middle of the fracturing section were 24.54%, 20.6%, and 9.2%, respectively. Figure 3 As shown, the hydrogen production molar ratio of gas wells in the middle of the fracturing section where bottom water intrusion occurs is less than 10%. Therefore, gas wells without bottom water intrusion or with bottom water intrusion at the bottom of the fracturing section are considered as target gas wells, and their suitability is ranked as follows: gas wells without bottom water intrusion are more suitable than gas wells with bottom water intrusion at the bottom of the fracturing section.

[0086] Optionally, the first preset condition mentioned above is: the self-heating temperature of the gas reservoir is not lower than 450°C.

[0087] Optionally, the second preset condition is: the current water saturation of the candidate gas well is not greater than 0.5.

[0088] Optionally, the third preset condition mentioned above is: the simulated hydrogen production molar ratio of the target gas well is not less than 20%.

[0089] Example 2

[0090] This application provides a gas reservoir screening system based on in-situ hydrogen production through combustion self-heating, applicable to any of the gas reservoir screening methods based on in-situ hydrogen production through combustion self-heating in Embodiment 1, such as... Figure 5As shown, it includes:

[0091] The parameter acquisition module is used to acquire the gas reservoir parameters corresponding to each candidate gas reservoir. The gas reservoir parameters include at least combustion enthalpy change, geological parameters and rock thermodynamic parameters.

[0092] The gas reservoir screening module is used to calculate the natural gas combustion heat release of each candidate gas reservoir based on the gas reservoir parameters corresponding to each candidate gas reservoir, and to identify the candidate gas reservoirs that meet the first preset condition for natural gas combustion heat release as candidate gas reservoirs.

[0093] Optionally, the above system may also include:

[0094] The first screening module is used to perform historical fitting processing on the candidate gas reservoirs based on the detailed gas reservoir data of each candidate gas reservoir, to obtain the historical fitting result of each candidate gas reservoir, and to determine the candidate gas wells that meet the second preset conditions among the candidate gas wells of the corresponding candidate gas reservoir as candidate gas wells based on each historical fitting result.

[0095] Optionally, the first filtering module mentioned above may include:

[0096] The first submodule is used to build a geological model corresponding to each candidate gas reservoir based on the reservoir detailed description report and production dynamic data of each candidate gas reservoir, and based on the modeling software Petrel. The reservoir detailed data includes the reservoir detailed description report and production dynamic data.

[0097] The second submodule is used to perform historical fitting on each geological model to obtain the average water saturation of each candidate gas well in each candidate gas reservoir.

[0098] The third submodule is used to identify gas wells that meet the second preset conditions as candidate gas wells.

[0099] The second screening module is used to perform numerical simulation processing on the candidate gas wells according to the gas well parameters of each candidate gas well, obtain the numerical simulation results of each candidate gas well, and determine the candidate gas wells whose numerical simulation results meet the third preset conditions as target gas wells.

[0100] Optionally, the second filtering module mentioned above may include:

[0101] The third submodule is used to conduct numerical simulations of in-situ hydrogen production through combustion self-heating using the CMG-Stars software to obtain the molar percentage of hydrogen production for each candidate gas well.

[0102] Optionally, the third submodule mentioned above includes at least multiple combustion reactions, multiple hydrogen production reactions, and multiple hydrogen consumption reactions;

[0103] The combustion reactions are: CH4 + 2O2 = CO2 + 2H2O, CH4 + 1.5O2 = CO + 2H2O, CO + 0.5O2 = CO2;

[0104] Several hydrogen production reactions are: CH4 + 0.5O2 = CO + 2H2, CH4 + H2O = CO + 3H2, CO + H2O = CO2 + H2;

[0105] Several hydrogen-consuming reactions are: H2 + 0.5O2 = H2O, CO2 + H2 = CO + H2O.

[0106] The fourth submodule is used to identify candidate gas wells that meet the third preset condition as target gas wells.

[0107] Example 3

[0108] This application provides an electronic device, such as... Figure 6 As shown, it includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the method of any one of Embodiment 1.

[0109] Example 4

[0110] This application provides a non-transitory computer-readable storage medium that stores computer instructions that cause a computer to perform any of the methods in Embodiment 1.

[0111] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A gas reservoir screening method based on in-situ hydrogen production via combustion self-heating, characterized in that, Includes the following steps: Obtain the gas reservoir parameters corresponding to each candidate gas reservoir, wherein the gas reservoir parameters include at least combustion enthalpy change, geological parameters and rock thermodynamic parameters; Based on the gas reservoir parameters corresponding to each candidate gas reservoir, the heat release of natural gas combustion of each candidate gas reservoir is calculated, and the candidate gas reservoir that meets the first preset condition for heat release of natural gas combustion is determined as a candidate gas reservoir; the first preset condition is: the self-heating temperature of the gas reservoir is not lower than 450°C. The heat release from the combustion of natural gas is expressed by a first formula, which is: ； In the formula, This indicates that the combustion of natural gas releases heat. Indicates the pressure of the gas reservoir. Indicates the enthalpy change of combustion. Indicates the porosity of the gas reservoir. Indicates gas saturation. Indicates atmospheric pressure. Represents the standard gas molar volume constant. This indicates the specific heat capacity of water. Indicates the heat capacity of rocks, This indicates the original temperature of the gas reservoir.

2. The gas reservoir screening method based on in-situ hydrogen production via combustion self-heating according to claim 1, characterized in that, The method further includes: Based on the detailed gas reservoir data of each candidate gas reservoir, the candidate gas reservoirs are subjected to historical fitting processing to obtain the historical fitting result of each candidate gas reservoir. Based on each historical fitting result, the candidate gas wells that meet the second preset condition among the candidate gas wells of the corresponding candidate gas reservoir are determined as candidate gas wells. Numerical simulation processing is performed on each candidate gas well based on its gas well parameters to obtain the numerical simulation results for each candidate gas well. The candidate gas well that meets the numerical simulation results of the third preset condition is determined as the target gas well.

3. The gas reservoir screening method based on in-situ hydrogen production via combustion self-heating according to claim 1, characterized in that, The geological parameters include at least gas reservoir porosity, pressure, and gas saturation; the rock thermodynamic parameters include at least rock heat capacity.

4. The gas reservoir screening method based on in-situ hydrogen production via combustion self-heating according to claim 2, characterized in that, The step of performing historical fitting processing on the candidate gas reservoirs based on the detailed gas reservoir data of each candidate gas reservoir to obtain the historical fitting result of each candidate gas reservoir, and determining the candidate gas wells that meet the second preset condition among the candidate gas wells of the corresponding candidate gas reservoir as candidate gas wells based on the historical fitting result of each candidate gas reservoir, includes: Based on the reservoir detailed description report and production dynamic data of each candidate gas reservoir, and based on the modeling software Petrel, a geological model corresponding to each candidate gas reservoir is established. The reservoir detailed data includes the reservoir detailed description report and production dynamic data. Historical fitting is performed on each of the geological models to obtain the average water saturation of each candidate gas well in each candidate gas reservoir; The gas wells that meet the second preset conditions are identified as candidate gas wells.

5. A gas reservoir screening method based on in-situ hydrogen production via combustion self-heating according to claim 2, characterized in that, The step of performing numerical simulation processing on the candidate gas wells based on the gas well parameters of each candidate gas well to obtain the numerical simulation result of each candidate gas well, and determining the candidate gas wells whose numerical simulation results meet the third preset condition as the target gas wells, includes: The CMG-Stars software was used to conduct numerical simulations of in-situ hydrogen production through combustion self-heating on the well parameters of each candidate gas well, and the molar percentage of hydrogen production corresponding to each candidate gas well was obtained. The candidate gas wells that meet the third preset condition are identified as target gas wells.

6. The gas reservoir screening method based on in-situ hydrogen production via combustion self-heating according to claim 5, characterized in that, The numerical simulation process includes at least multiple combustion reactions, multiple hydrogen production reactions, and multiple hydrogen consumption reactions; The combustion reactions described are: CH4 + 2O2 = CO2 + 2H2O, CH4 + 1.5O2 = CO + 2H2O, CO + 0.5O2 = CO2; The hydrogen production reactions are: CH4 + 0.5O2 = CO + 2H2, CH4 + H2O = CO + 3H2, CO + H2O = CO2 + H2; The hydrogen-consuming reactions are: H2 + 0.5O2 = H2O, CO2 + H2 = CO + H2O.

7. A gas reservoir screening method based on in-situ hydrogen production via combustion self-heating according to claim 2, characterized in that, The second preset condition is: the current water saturation of the candidate gas well is not greater than 0.

5.

8. A gas reservoir screening method based on in-situ hydrogen production via combustion self-heating according to claim 2, characterized in that, The third preset condition is that the simulated hydrogen production molar ratio of the target gas well is not less than 20%.

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