Gas reservoir screening method and system based on combustion self-heating in-situ hydrogen production

Abstract

The invention discloses a gas reservoir screening method and system based on combustion self-heating in-situ hydrogen production, and relates to the technical field of oil and gas field development, the method comprises the steps that gas reservoir parameters corresponding to all gas reservoirs to be selected are obtained, and the gas reservoir parameters at least comprise combustion enthalpy change, geological parameters and rock thermodynamic parameters; according to the gas reservoir parameters corresponding to all the to-be-selected gas reservoirs, natural gas combustion heat release of all the to-be-selected gas reservoirs is obtained through calculation, and the to-be-selected gas reservoirs meeting the natural gas combustion heat release of a first preset condition are determined as candidate gas reservoirs; according to the method, the gas reservoir suitable for combustion self-heating in-situ hydrogen production can be effectively screened out, popularization of the gas reservoir combustion self-heating in-situ hydrogen production technology is achieved, screening standardization of gas reservoir combustion self-heating in-situ hydrogen production is achieved through the method used in the scheme, a development strategy can be provided for gas reservoir combustion self-heating in-situ hydrogen production, and the method is suitable for popularization and application of the gas reservoir combustion self-heating in-situ hydrogen production. The method has great theoretical and practical significance.

Description

Technical Field

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

[0002] Natural gas is an important low-carbon energy source. Improving recovery rate and development efficiency is currently a hot topic. However, most natural gas reservoirs have edge water or bottom water. As gas reservoir exploitation proceeds, edge and bottom water advances rapidly, and gas wellbore and its vicinity begin to be flooded, which will seriously affect the recovery rate of the gas reservoir.

[0003] Hydrogen is considered to be the main energy source in the future due to its high calorific value and pollution-free advantages. Hydrogen production from natural gas mainly adopts the method of steam re-distillation and partial oxidation. At present, the in-situ hydrogen production technology of hydrocarbons in oil and gas reservoirs has received widespread attention. The disclosed inventions of in-situ hydrogen production from oil and gas reservoirs include "In-situ process for producing synthesis gas from underground hydrocarbon reservoirs" (patent number: 201780014999.7). Currently, there is no literature mentioning the screening method for gas reservoirs suitable for hydrogen production.

[0004] Although there have been many studies on the technology of in-situ hydrogen production in oil and gas reservoirs at home and abroad, there is little theoretical understanding of the development of in-situ hydrogen production. Therefore, it is urgent to carry out research on in-situ hydrogen production by self-heating of combustion by air injection in gas reservoirs. As an important link in the research of in-situ hydrogen production by combustion self-heating in gas reservoirs, the screening standard of combustion self-heating gas reservoirs is a key indicator that affects and restricts the application scope and effect of combustion self-heating in-situ hydrogen production technology. However, there is currently a blank in the screening criteria suitable for combustion self-heating gas reservoirs, which seriously hinders the promotion and application of in-situ hydrogen production by combustion self-heating in gas reservoirs.

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

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

[0007] The above technical objectives of the present invention are achieved through the following technical solutions:

[0008] In a first aspect, an embodiment of the present application provides a gas reservoir screening method based on in-situ hydrogen production by combustion self-heating, comprising the following steps:

[0009] Obtaining gas reservoir parameters corresponding to each candidate gas reservoir, wherein the gas reservoir parameters at least include combustion enthalpy change, geological parameters and rock thermodynamic parameters;

[0010] The natural gas combustion heat release of each candidate gas reservoir is calculated according to the gas reservoir parameters corresponding to each candidate gas reservoir, and the candidate gas reservoir with natural gas combustion heat release that meets the first preset condition is determined as a candidate gas reservoir.

[0011] The beneficial effects of the present invention are as follows: in response to the current problem of lack of screening criteria suitable for in-situ hydrogen production by combustion self-heating, this scheme establishes screening criteria for gas reservoirs suitable for in-situ hydrogen production by combustion self-heating by clarifying the combustion self-heating temperature of the gas reservoir, and the gas reservoir with a combustion self-heating temperature greater than 450°C is used as the screening condition, that is, the gas reservoir with a combustion self-heating temperature greater than 450°C can be the first preset condition, so first determine whether the unit volume heat of the gas reservoir can heat the reservoir to 450°C. The method used in this scheme not only realizes the standardization of screening for in-situ hydrogen production by combustion self-heating of gas reservoirs, but also provides a development strategy for in-situ hydrogen production by combustion self-heating of gas reservoirs, which has great theoretical and practical significance.

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

[0013] Furthermore, the above method also includes:

[0014] Performing history matching processing on the candidate gas reservoirs according to the gas reservoir fine data of each candidate gas reservoir to obtain a history matching result for each candidate gas reservoir, and determining, according to each history matching result, a candidate gas well that satisfies a second preset condition among the candidate gas wells corresponding to the candidate gas reservoir as a candidate gas well;

[0015] Numerical simulation is performed on the candidate gas wells according to their gas well parameters to obtain numerical simulation results for each candidate gas well, and the candidate gas wells whose numerical simulation results meet the third preset condition are determined as target gas wells.

[0016] The beneficial effect of adopting the above further scheme is: after obtaining the 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 each gas well for the self-heating in-situ hydrogen production method.

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

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

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

[0020]

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

[0022] Further, the above-mentioned performing history matching processing on the candidate gas reservoirs according to the gas reservoir fine data of each candidate gas reservoir to obtain the history matching result of each candidate gas reservoir, and according to each history matching result, determining the candidate gas wells that meet the second preset condition among the candidate gas wells corresponding to the candidate gas reservoir as candidate gas wells, including:

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

[0024] Perform history matching on each geological model to obtain the average water saturation of each candidate gas well in each candidate gas reservoir;

[0025] The to-be-selected gas wells that meet the second preset condition are determined as candidate gas wells.

[0026] Further, the above-mentioned performing numerical simulation processing on the candidate gas wells according to 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 well whose numerical simulation result meets the third preset condition as the target gas well, includes:

[0027] The software CMG-Stars was used to carry out numerical simulation of in-situ hydrogen production by combustion self-heating on the gas well parameters of each candidate gas well, and the corresponding molar percentage of hydrogen production of each candidate gas well was obtained;

[0028] The candidate gas well that meets the third preset condition is determined as the target gas well.

[0029] Furthermore, in the numerical simulation process, at least a plurality of combustion reactions, a plurality of hydrogen production reactions and a plurality of hydrogen consumption reactions are included;

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

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

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

[0033] The beneficial effect of adopting the above further scheme is: comprehensive consideration of multiple reactions regarding the origin and destination of hydrogen in the numerical simulation process makes the numerical simulation closer to the real environment, and ultimately the hydrogen production and hydrogen production molar ratio are more accurate.

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

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

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

[0037] In a second aspect, an embodiment of the present application provides a gas reservoir screening system based on in-situ hydrogen production by combustion self-heating, which is applied to a gas reservoir screening method based on in-situ hydrogen production by combustion self-heating in any one of the first aspects, comprising:

[0038] A parameter acquisition module is used to obtain gas reservoir parameters corresponding to each selected gas reservoir, wherein the gas reservoir parameters at least include 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 according to the gas reservoir parameters corresponding to each candidate gas reservoir, and determine the candidate gas reservoir with natural gas combustion heat release that meets the first preset condition as the candidate gas reservoir.

[0040] In a third aspect, an embodiment of the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any one of the methods in the first aspect when executing the computer program.

[0041] In a fourth aspect, an embodiment of the present application provides a non-transitory computer-readable storage medium, which stores computer instructions, and the computer instructions enable a computer to execute any one of the methods in the first aspect.

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

[0043] In this application, in order to solve the problem of the current lack of screening criteria suitable for in-situ hydrogen production by combustion self-heating, screening criteria for gas reservoirs suitable for in-situ hydrogen production by combustion self-heating are established by clarifying the combustion self-heating temperature of the gas reservoirs. Gas reservoirs with combustion self-heating temperatures greater than 450°C are used as screening conditions. 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 scheme not only realizes the standardization of screening for in-situ hydrogen production by combustion self-heating of gas reservoirs, but also provides a development strategy for in-situ hydrogen production by combustion self-heating of gas reservoirs, which has great theoretical and practical significance.

[0044] In the present application, after obtaining the candidate gas reservoirs through screening, multiple gas wells in the candidate gas reservoirs are also 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 each gas well in each candidate gas reservoir for the self-heating in-situ hydrogen production method. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

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

[0047] Figure 2 Schematic diagram of each reaction in the in-situ hydrogen production in an embodiment of the present invention;

[0048] Figure 3 is a histogram of the molar percentage of hydrogen produced in an embodiment of the present invention;

[0049] Figure 4 A method flow chart of the screening method in an embodiment of the present invention;

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

[0051] Figure 6 Schematic diagram of the connection of electronic equipment in an embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0053] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0055] In the description of the embodiments of the present invention, "plurality" means at least 2.

[0056] Example 1

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

[0058] S1, obtaining gas reservoir parameters corresponding to each candidate gas reservoir, wherein the gas reservoir parameters at least include 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 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; and the rock thermodynamic parameters include at least rock heat capacity.

[0061] S2, calculating the natural gas combustion heat release of each candidate gas reservoir according to the gas reservoir parameters corresponding to each candidate gas reservoir, and determining the candidate gas reservoir with natural gas combustion heat release that meets the first preset condition as the candidate gas reservoir.

[0062] Among them, according to 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 each candidate gas reservoir can reach by self-heating, and this temperature data is used as the condition for screening candidate gas reservoirs; specifically, see Figure 1 Since the self-heating needs to reach 450°C to achieve the condition of in-situ hydrogen production, the first preset condition can be set to that the heat release of natural gas combustion needs to be greater than 450°C.

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

[0064]

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

[0066] Optionally, the above method further includes:

[0067] S3, performing history matching processing on the candidate gas reservoirs according to the gas reservoir fine data of each candidate gas reservoir to obtain the history matching result of each candidate gas reservoir, and according to each history matching result, determining the candidate gas wells that meet the second preset condition among the candidate gas wells corresponding to the candidate gas reservoir as candidate gas wells.

[0068] Among them, when historical fitting of candidate gas reservoirs is performed according to the detailed data of gas reservoirs, it can be performed based on petrel, the mainstream modeling software in the oil and gas industry; specifically, first, it is necessary to obtain the detailed data of the gas reservoirs of the candidate gas reservoirs, and the detailed data of the gas reservoirs include detailed description reports of oil reservoirs and production dynamic data. The detailed description reports of oil reservoirs include parameters such as the gas-water distribution of gas reservoirs and gas reservoir pressure, gas saturation, etc. The production dynamic data include parameters such as gas reservoir production history, well opening history, and measures history, and can also include sedimentary phase data, logging data, etc.; based on these parameters, a geological model corresponding to the candidate gas reservoir is established, and when historical fitting is performed on the historical model, the average water saturation in the historical fitting results can be used as a screening condition for candidate gas wells.

[0069] Optionally, the above-mentioned performing history matching processing on the candidate gas reservoirs according to the gas reservoir fine data of each candidate gas reservoir to obtain the history matching result of each candidate gas reservoir, and according to each history matching result, determining the candidate gas wells that meet the second preset condition among the candidate gas wells corresponding to the candidate gas reservoir as candidate gas wells, including:

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

[0071] Perform history matching on each geological model to obtain the average water saturation of each candidate gas well in each candidate gas reservoir;

[0072] The to-be-selected gas wells that meet the second preset condition are determined as candidate gas wells.

[0073] S4, performing numerical simulation processing on the candidate gas wells according to the gas well parameters of each candidate gas well to obtain a numerical simulation result of each candidate gas well, and determining the candidate gas well whose numerical simulation result meets the third preset condition as the target gas well.

[0074] Among them, after obtaining the 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 each gas well for the self-heating in-situ hydrogen production method.

[0075] Optionally, the above-mentioned performing numerical simulation processing on the candidate gas wells according to 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 well whose numerical simulation result meets the third preset condition as the target gas well, includes:

[0076] The software CMG-Stars was used to carry out numerical simulation of in-situ hydrogen production by combustion self-heating on the gas well parameters of each candidate gas well, and the corresponding molar percentage of hydrogen production of each candidate gas well was obtained;

[0077] The candidate gas well that meets the third preset condition is determined as the target gas well.

[0078] Among them, numerical simulation processing can be achieved through CMG-Stars, the 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 proportion of hydrogen production of each candidate gas well can be obtained, and each candidate gas well is ranked according to the molar proportion of hydrogen production, which serves as a basis for judging the suitability of gas reservoirs and gas wells for in-situ hydrogen production; specifically, no less than 20% of the candidate gas wells can be determined as target gas wells, and the third preset condition is no less than 20% of the candidate gas wells.

[0079] Optionally, the numerical simulation process includes at least a plurality of combustion reactions, a plurality of hydrogen production reactions and a plurality of hydrogen consumption reactions;

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

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

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

[0083] Among them, multiple reactions regarding the origin and destination of hydrogen are comprehensively considered in the numerical simulation processing, making the numerical simulation closer to the real environment, and finally obtaining more accurate hydrogen production and molar ratio of hydrogen production.

[0084] Specifically, various chemical reactions related to the origin and destination of hydrogen are considered comprehensively, because hydrogen will undergo multiple chemical reactions in the environment where the gas reservoir is located, such as Figure 2 As shown, taking all these reactions into consideration 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 production method of a gas reservoir in the Southwest Oil and Gas Field is horizontal well volume fracturing. The matrix porosity of the gas reservoir is 0.1, the permeability is 0.01mD, the gas reservoir pressure is 20MPa, the gas saturation is 0.8, and the average porosity of the fracturing transformation area is 0.225. The first formula can be used to calculate the reservoir heating temperature, and it is found that the combustion heating temperature in the fracture transformation area is 603.6℃, ​​which is greater than 450℃ and meets the in-situ hydrogen production conditions; further obtain the detailed description data and production history data of the gas reservoir to construct a geological model and Carry out historical matching; after the fitting, the gas-water distribution characteristics are obtained, and three gas wells with water saturation less than 0.5 are selected, and their gas-water distribution characteristics are no bottom water invasion, bottom water invasion at the bottom of the fracturing section, and bottom water invasion in the middle of the fracturing section; the CMG-Stars module is used to carry out numerical simulation of self-combustion heating in-situ hydrogen production on the three candidate gas wells. The simulation results show that the hydrogen production mole fractions of the three gas wells without bottom water invasion, bottom water invasion at the bottom of the fracturing section, and bottom water invasion at the middle of the fracturing section are 24.54%, 20.6%, and 9.2%, respectively. Figure 3 As shown in the figure, the molar proportion of hydrogen production in the gas wells in the middle of the bottom water invasion fracturing section is less than 10%. Therefore, the gas wells without bottom water invasion and at the bottom of the bottom water invasion fracturing section are taken as target gas wells, and are ranked according to suitability as follows: suitability of gas wells without bottom water invasion > suitability of gas wells at the bottom of the bottom water invasion fracturing section.

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

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

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

[0089] Example 2

[0090] The present application embodiment provides a gas reservoir screening system based on in-situ hydrogen production by combustion self-heating, which is applied to a gas reservoir screening method based on in-situ hydrogen production by combustion self-heating in any one of the embodiments 1, such as Figure 5As shown, including:

[0091] The parameter acquisition module is used to obtain the gas reservoir parameters corresponding to each candidate gas reservoir, and the gas reservoir parameters at least include 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 according to the gas reservoir parameters corresponding to each candidate gas reservoir, and determine the candidate gas reservoir with natural gas combustion heat release that meets the first preset condition as the candidate gas reservoir.

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

[0094] The first screening module is used to perform history matching processing on the candidate gas reservoirs according to the gas reservoir fine data of each candidate gas reservoir to obtain the history matching result of each candidate gas reservoir, and according to each history matching result, determine the candidate gas wells that meet the second preset condition among the candidate gas wells corresponding to the candidate gas reservoir as candidate gas wells.

[0095] Optionally, the first screening module may include:

[0096] The first submodule is used to establish 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 the modeling software petrel. The gas reservoir detailed data includes the reservoir detailed description report and production dynamic data.

[0097] The second submodule is used to perform history matching 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 determine the candidate gas wells that meet the second preset condition 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 to obtain the numerical simulation result of each candidate gas well, and determine the candidate gas well whose numerical simulation result meets the third preset condition as the target gas well.

[0100] Optionally, the second screening module may include:

[0101] The third submodule is used to use the software CMG-Stars to carry out numerical simulation of in-situ hydrogen production by combustion self-heating on the gas well parameters of each candidate gas well, and obtain the corresponding molar ratio of hydrogen production of each candidate gas well.

[0102] Optionally, the third submodule includes at least a plurality of combustion reactions, a plurality of hydrogen production reactions and a plurality of hydrogen consumption reactions;

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

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

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

[0106] The fourth submodule is used to determine the candidate gas well that meets the third preset condition as the target gas well.

[0107] Example 3

[0108] The present application embodiment 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, any method in Embodiment 1 is implemented.

[0109] Example 4

[0110] An embodiment of the present application provides a non-transitory computer-readable storage medium, which stores computer instructions, and the computer instructions enable a computer to execute any method in Example 1.

[0111] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method 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 in the scope of protection of the present invention.

Claims

1. A gas reservoir screening method based on in-situ hydrogen production by combustion self-heating, characterized in that: The following steps are involved: Obtaining gas reservoir parameters corresponding to each of the selected gas reservoirs, wherein the gas reservoir parameters at least include combustion enthalpy change, geological parameters and rock thermodynamic parameters; The natural gas combustion heat release of each of the candidate gas reservoirs is calculated according to the gas reservoir parameters corresponding to each of the candidate gas reservoirs, and the candidate gas reservoirs that meet the first preset condition and release natural gas combustion heat are determined as candidate gas reservoirs.

2. A gas reservoir screening method based on in-situ hydrogen production by combustion self-heating according to claim 1, characterized in that: The method further comprises: Performing history matching processing on the candidate gas reservoirs according to the gas reservoir fine data of each candidate gas reservoir to obtain a history matching result of each candidate gas reservoir, and determining, according to each history matching result, a candidate gas well that satisfies a second preset condition among the candidate gas wells corresponding to the candidate gas reservoir as a candidate gas well; Numerical simulation processing is performed on the candidate gas wells according to the gas well parameters of each candidate gas well to obtain a numerical simulation result of each candidate gas well, and the candidate gas well whose numerical simulation result meets the third preset condition is determined as the target gas well.

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

4. A gas reservoir screening method based on in-situ hydrogen production by combustion self-heating according to claim 3, characterized in that: The heat release from natural gas combustion is expressed by a first formula, which is: In the formula, T1 represents the heat release of natural gas combustion, P represents the pressure of the gas reservoir, ΔH represents the combustion enthalpy change, φ represents the porosity of the gas reservoir, and S g represents gas saturation, P0 represents atmospheric pressure, V m represents the standard gas molar volume constant, C w represents the specific heat capacity of water, C r represents the heat capacity of rock, and T0 represents the original temperature of the gas reservoir.

5. A gas reservoir screening method based on in-situ hydrogen production by combustion self-heating according to claim 2, characterized in that: The method of performing history matching processing on the candidate gas reservoirs according to the gas reservoir fine data of each candidate gas reservoir to obtain a history matching result of each candidate gas reservoir, and determining, according to each history matching result, a candidate gas well that satisfies a second preset condition among the candidate gas wells corresponding to the candidate gas reservoir as a candidate gas well, comprises: According to the reservoir detailed description report and production performance data of each candidate gas reservoir, a geological model corresponding to each candidate gas reservoir is established based on the modeling software petrel, wherein the gas reservoir detailed data includes the reservoir detailed description report and production performance data; Performing history matching on each of the geological models to obtain the average water saturation of each candidate gas well in each of the candidate gas reservoirs; The to-be-selected gas wells that meet the second preset condition are determined as candidate gas wells.

6. A gas reservoir screening method based on in-situ hydrogen production by combustion self-heating according to claim 2, characterized in that: The step of performing numerical simulation processing on the candidate gas wells according to the gas well parameters of each candidate gas well to obtain a numerical simulation result of each candidate gas well, and determining the candidate gas well whose numerical simulation result meets the third preset condition as the target gas well comprises: The software CMG-Stars is used to carry out numerical simulation of in-situ hydrogen production by combustion self-heating on the gas well parameters of each candidate gas well to obtain the molar percentage of hydrogen production corresponding to each candidate gas well; The candidate gas well that meets the third preset condition is determined as the target gas well.

7. A gas reservoir screening method based on in-situ hydrogen production by combustion self-heating according to claim 6, characterized in that: In the numerical simulation process, at least a plurality of combustion reactions, a plurality of hydrogen production reactions and a plurality of hydrogen consumption reactions are included; A plurality of the combustion reactions are: CH4+2O2=CO2+2H2O, CH4+1.5O2=CO+2H2O, CO+0.5O2=CO2; A plurality of the hydrogen production reactions are: CH4+0.5O2=CO+2H2, CH4+H2O=CO+3H2, CO+H2O=CO2+H2; The plurality of hydrogen consuming reactions are: H2+0.5O2=H2O, CO2+H2=CO+H2O.

8. The method for gas reservoir screening based on in-situ hydrogen production by combustion self-heating according to claim 1, characterized in that: The first preset condition is that the self-heating temperature of the gas reservoir is not less than 450°C.

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

5.

10. A gas reservoir screening method based on in-situ hydrogen production by 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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