Evaluation method based on exhausted gas reservoir underground hydrogen storage reservoir microorganism hydrogen consumption numerical model

Abstract

The invention provides an evaluation method based on a microorganism hydrogen consumption numerical model of an exhausted gas reservoir underground hydrogen storage, which comprises the following steps: firstly, determining the type and content of hydrogen-consuming microorganisms in an exhausted oil and gas reservoir according to geological information of the exhausted oil and gas reservoir, and determining the content of the hydrogen-consuming microorganisms in the exhausted oil and gas reservoir according to the type of the hydrogen-consuming microorganisms; considering the reaction and mass transfer process of the hydrogen-consuming microorganisms in the underground hydrogen storage bank, and constructing a mathematical model of the hydrogen-consuming activity of the microorganisms in the exhausted underground hydrogen storage bank; carrying out two-dimensional porous medium model verification calculation on the constructed mathematical model, and randomly generating a three-dimensional porous medium model by utilizing a Monte Carlo method to carry out numerical simulation calculation so as to correct the constructed mathematical model; and finally, analyzing the activity state of the microorganisms in the underground hydrogen storage bank by combining the calculation result of the three-dimensional porous medium model, thereby effectively monitoring the activity state of the hydrogen-consuming microorganisms in the underground hydrogen storage bank, evaluating the safety of the underground hydrogen storage bank and maintaining the long-term stable and efficient operation of the underground hydrogen storage bank.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas storage in depleted oil and gas reservoirs, and particularly relates to an evaluation method based on a numerical model of hydrogen consumption by microorganisms in an underground hydrogen storage reservoir in a depleted gas reservoir. Background Art

[0002] Hydrogen is an important fuel and chemical raw material and is listed as the most ideal clean energy in the 21st century. Different from traditional non-renewable fossil fuels, hydrogen can be obtained through various methods such as electrolysis, chemical cracking, hydrolysis, solar photolysis, and utilization of hydrogen-producing microbial communities with photosynthesis. Among them, electrolytic hydrogen production using renewable energy sources such as wind energy, solar energy, and hydropower has been widely recognized by all parties.

[0003] Safe and efficient storage and transportation are the key links in the commercial utilization of the hydrogen energy industry chain. Currently, the existing research on hydrogen storage technologies mainly includes compressed gas or liquid in high-pressure or low-temperature containers, adsorbed state on the surface of porous materials with a large specific surface area, chemical bonding of covalent and ionic compounds, and oxidation of active metals. However, these high-cost hydrogen storage technologies are difficult to achieve large-scale hydrogen storage. Currently, the most favored option is underground hydrogen storage (UHS). UHS refers to injecting and storing hydrogen in a stable geological structure, and a large number of studies have confirmed the feasibility of underground hydrogen storage. Depleted oil and gas reservoir UHS has advantages such as large reserves, high geological recognition, wide geographical distribution, low investment and operation costs, and mature development experience, and has received more extensive attention.

[0004] Different from other gases, hydrogen has a small mass and viscosity and stronger penetrability. The biochemical reactions of brine, residual oil and gas, rock minerals, and microorganisms in the formation may change the gas components, reducing the purity and hydrogen storage capacity of hydrogen. At the same time, there are some hydrogen-consuming microorganisms in depleted gas reservoirs, and the abundant remaining water in the reservoir provides a good environment for the growth and reproduction of these microbial communities, and the microorganisms are active under high temperature and high pressure conditions. Therefore, in-depth understanding of the hydrogen transport mechanism in the underground reservoir and the reaction mechanism of hydrogen-consuming microorganisms helps to achieve safe, economic, and efficient storage of hydrogen in depleted oil and gas reservoirs. However, previous research and methods only considered single-phase and non-miscible two-phase flow, did not consider the multi-component transport of the brine and hydrogen system in two-phase flow, and ignored the conversion of hydrogen by microorganisms and the influence of the growth-decay mechanism of microbial biofilms on pore structure and fluid transport.

[0005] Therefore, how to provide an evaluation method based on a numerical model of hydrogen consumption by microorganisms in an underground hydrogen storage reservoir in a depleted gas reservoir, and by establishing a numerical model of hydrogen consumption by underground hydrogen storage microorganisms, truly reflect the activity state of microorganisms in the underground hydrogen storage reservoir, so as to effectively monitor the operation state of the underground hydrogen storage reservoir is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0006] The object of the present invention is to provide an evaluation method based on a numerical model of microbial hydrogen consumption in an underground hydrogen storage reservoir in a depleted gas reservoir, so as to solve at least one of the above technical problems.

[0007] To achieve the above object, the first aspect of the present invention provides an evaluation method based on a numerical model of microbial hydrogen consumption in an underground hydrogen storage reservoir in a depleted gas reservoir, and the method includes: determining the types and contents of hydrogen-consuming microorganisms in the reservoir of the depleted oil and gas reservoir according to the geological information of the reservoir of the depleted oil and gas reservoir; constructing a mathematical model of the hydrogen consumption activity of microorganisms in the depleted underground hydrogen storage reservoir according to the types of the hydrogen-consuming microorganisms; performing verification calculations on the mathematical model by using a two-dimensional porous medium model; randomly generating a three-dimensional porous medium model based on the Monte Carlo method, and performing numerical simulation calculations; analyzing the activity state of the hydrogen-consuming microorganisms in the underground hydrogen storage reservoir in combination with the calculation results of the three-dimensional porous medium model, so as to complete the monitoring of the operation state of the underground hydrogen storage reservoir and evaluate the safety of the underground hydrogen storage reservoir.

[0008] In the first aspect, constructing the mathematical model of the hydrogen consumption activity of microorganisms in the depleted underground hydrogen storage reservoir includes: establishing a porous biofilm-aqueous layer model based on the growth-decay mechanism of the hydrogen-consuming microorganisms in the underground hydrogen storage reservoir; determining the growth rate of the porous biofilm based on the porous biofilm-aqueous layer model and the mass balance equation of the porous biofilm; establishing a pseudo-porous hydrate zone in combination with the virtual porosity technology to simulate the mass transfer process of the porous biofilm; establishing the multi-component fluid flow and mass transport equations in the porous biofilm based on the reaction process of the hydrogen-consuming microorganisms.

[0009] In the first aspect, the mass balance equation of the porous biofilm includes: Among them, is the volume fraction of the porous biofilm, V b is the volume of the porous biofilm, V is the volume of the hydrogen-consuming microorganisms, is the velocity of the fluid in the porous biofilm, is the rate of change of the velocity of the porous biofilm caused by the growth or decay of the hydrogen-consuming microorganisms; is the density of the porous biofilm, and t is the time.

[0010] In the first aspect, the growth rate of the porous biofilm includes: Among them, is the rate of change of the velocity of the porous biofilm caused by the hydrogen-consuming microorganism i, is the growth rate of the porous biofilm of hydrogen-consuming microorganism i, is the endogenous decay rate of the porous biofilm, is the constant decay coefficient of the porous biofilm, is the volume fraction of the porous biofilm of hydrogen-consuming microorganism i, is the maximum growth rate of the hydrogen-consuming microorganism, is the molar concentration of dissolved component j, is the half-saturation constant of dissolved component j.

[0011] In the first aspect, the momentum source term S of the pseudo-porous hydrated zone is: where, is the effective permeability of the pseudo-porous hydrated zone, is the velocity of any phase in the porous biofilm, is the porosity of the pseudo-porous biofilm, is a non-zero constant, is a constant of the pseudo-porous hydrated zone.

[0012] In the first aspect, the multi-component fluid flow and mass transport equations include: where, is the mass fraction of hydrogen-consuming microorganism i, is the diffusion flux vector of hydrogen-consuming microorganism i along the concentration and temperature gradients, is the net production rate of hydrogen-consuming microorganism i during the reaction process, is the source term of hydrogen-consuming microorganism i dissolved in the water gas, is the binary mass diffusion coefficient of hydrogen-consuming microorganism i in dissolved component j, is the thermal diffusion coefficient of hydrogen-consuming microorganism i, and T is the temperature.

[0013] In the first aspect, equations (1)-(7) are solved by simultaneous coupling to complete the establishment of the mathematical model for the hydrogen-consuming activity of microorganisms in depleted underground hydrogen storage reservoirs.

[0014] In the first aspect, the types of the hydrogen-consuming microorganisms include at least one of methanogens, sulfate-reducing bacteria, syntrophic acetate-oxidizing bacteria, and iron-reducing bacteria.

[0015] In the second aspect of the present invention, an electronic device is provided, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is configured to implement the evaluation method based on the numerical model of hydrogen consumption by microorganisms in a depleted gas reservoir underground hydrogen storage reservoir as described in any one of the first aspects when executing the computer program stored in the memory.

[0016] In a third aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored: when the computer program is executed by a processor, the evaluation method based on the numerical model of microbial hydrogen consumption in an underground hydrogen storage reservoir in a depleted gas reservoir as described in any one of the first aspects is implemented.

[0017] Beneficial effects: The present invention provides an evaluation method based on a numerical model of microbial hydrogen consumption in an underground hydrogen storage reservoir in a depleted gas reservoir. First, according to the geological information of the reservoir in the depleted oil and gas reservoir, the types and contents of hydrogen-consuming microorganisms in the reservoir of the depleted oil and gas reservoir are determined, and according to the types of hydrogen-consuming microorganisms, the reactions and mass transfer processes of the hydrogen-consuming microorganisms in the underground hydrogen storage reservoir are considered, and a mathematical model of the hydrogen-consuming activity of microorganisms in the depleted underground hydrogen storage reservoir is constructed; then, two-dimensional porous medium model verification calculations are carried out on the constructed mathematical model, and numerical simulation calculations are carried out by using the Monte Carlo method to randomly generate a three-dimensional porous medium model to correct the constructed mathematical model; finally, combined with the calculation results of the three-dimensional porous medium model, the activity state of microorganisms in the underground hydrogen storage reservoir is analyzed, so as to effectively monitor the activity state of hydrogen-consuming microorganisms in the underground hydrogen storage reservoir, evaluate the safety of the underground hydrogen storage reservoir, and maintain the long-term stable and efficient operation of the underground hydrogen storage reservoir. Description of the drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present specification or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic flow chart of an evaluation method based on a numerical model of microbial hydrogen consumption in an underground hydrogen storage reservoir in a depleted gas reservoir provided by the present invention; Figure 2 It is a schematic diagram of the velocity vector at different times and the contour lines of the volume fraction of the porous biofilm-water layer in the two-dimensional porous medium model provided in Example 1; Figure 3 It is a schematic diagram of the velocity vector at different times and the contour lines of the volume fraction of the porous biofilm-water layer in the three-dimensional porous medium model provided in Example 1; Figure 4 It is a schematic diagram of the relationship between the normalized permeability at different initial volume fractions of microorganisms and time and the porosity of the three-dimensional porous medium model provided in Example 1; Figure 5 It is a schematic diagram of the influence of the microbial community decay mechanism on the underground hydrogen storage process provided in Example 1; Figure 6Schematic diagram of the relationship between the normalized permeability and time of different porosity models provided for Example 1; Figure 7 Schematic diagram of the structure of an electronic device provided by the present invention; Figure 8 Schematic diagram of the structure of a computer-readable storage medium provided by the present invention. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] Terms such as "first" and "second" in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments described here can be implemented in an order other than that shown or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or modules does not necessarily have to be limited to those steps or modules clearly listed, but may include other steps or modules not clearly listed or inherent to these processes, methods, products or devices. The naming or numbering of steps that appear in this application does not mean that the steps in the method flow must be executed in the time / logical order indicated by the naming or numbering. The named or numbered process steps can change the execution order according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved.

[0022] The division of modules in this application is a logical division. In actual implementation, there may be other division methods. For example, multiple modules can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections between modules can be electrical or other similar forms, which are not limited in this application. And the modules or sub-modules described as separate components may or may not be physically separated, may or may not be physical modules, or may be distributed to multiple circuit modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this application.

[0023] Example 1 Please refer to Figure 1 , Embodiment 1 of the present invention provides an evaluation method based on a numerical model of microbial hydrogen consumption in an underground hydrogen storage reservoir in a depleted gas reservoir. The method includes: determining the types and contents of hydrogen-consuming microorganisms in the reservoir of the depleted oil and gas reservoir according to the geological information of the reservoir of the depleted oil and gas reservoir; constructing a mathematical model of the hydrogen consumption activity of microorganisms in the depleted underground hydrogen storage reservoir according to the types of the hydrogen-consuming microorganisms; performing verification calculations on the mathematical model using a two-dimensional porous medium model; randomly generating a three-dimensional porous medium model based on the Monte Carlo method and performing numerical simulation calculations; and analyzing the activity state of the hydrogen-consuming microorganisms in the underground hydrogen storage reservoir in combination with the calculation results of the three-dimensional porous medium model to complete the monitoring of the operation state of the underground hydrogen storage reservoir and evaluate the safety of the underground hydrogen storage reservoir.

[0024] Specifically, the present invention provides an evaluation method based on a numerical model of microbial hydrogen consumption in an underground hydrogen storage reservoir in a depleted gas reservoir. First, according to the geological information of the reservoir of the depleted oil and gas reservoir, determine the types and contents of hydrogen-consuming microorganisms in the reservoir of the depleted oil and gas reservoir, and according to the types of the hydrogen-consuming microorganisms, consider the reaction and mass transfer processes of the hydrogen-consuming microorganisms in the underground hydrogen storage reservoir to construct a mathematical model of the hydrogen consumption activity of microorganisms in the depleted underground hydrogen storage reservoir; then, perform verification calculations on the constructed mathematical model using a two-dimensional porous medium model, and use the Monte Carlo method to randomly generate a three-dimensional porous medium model for numerical simulation calculations to correct the constructed mathematical model; finally, analyze the activity state of the microorganisms in the underground hydrogen storage reservoir in combination with the calculation results of the three-dimensional porous medium model, and then effectively monitor the activity state of the hydrogen-consuming microorganisms in the underground hydrogen storage reservoir, evaluate the safety of the underground hydrogen storage reservoir, and maintain the long-term stable and efficient operation of the underground hydrogen storage reservoir.

[0025] In some possible implementation manners, the construction of the mathematical model of the hydrogen consumption activity of microorganisms in the depleted underground hydrogen storage reservoir includes: establishing a porous biofilm-aqueous layer model based on the growth-decay mechanism of the hydrogen-consuming microorganisms in the underground hydrogen storage reservoir; determining the growth rate of the porous biofilm based on the porous biofilm-aqueous layer model and the mass balance equation of the porous biofilm; establishing a pseudo-porous hydrate zone in combination with the virtual porosity technology to simulate the mass transfer process of the porous biofilm; and establishing an equation for the flow and mass transport of multi-component fluids in the porous biofilm based on the reaction process of the hydrogen-consuming microorganisms.

[0026] Subsurface microorganisms usually exist in the form of cell aggregates attached to the particle surface and in the form of binding through extracellular polymers. Therefore, the present invention constructs a porous biofilm-aqueous layer model to study the growth-decay mechanism of hydrogen-consuming microorganisms in subsurface hydrogen storage reservoirs, and establishes a mass balance equation for the porous biofilm to determine the growth rate of the porous biofilm, so as to evaluate the growth-decay situation of hydrogen-consuming microorganisms in subsurface hydrogen storage reservoirs; in addition, combined with the virtual porosity technology, a pseudo-porous hydrate zone is established to evaluate the reaction and mass transfer processes of hydrogen-consuming microorganisms in subsurface hydrogen storage reservoirs, and establish equations for multi-component fluid flow and mass transport in the porous biofilm, so as to comprehensively evaluate the activity status of hydrogen-consuming microorganisms in subsurface hydrogen storage reservoirs.

[0027] In some possible embodiments, the mass balance equation of the porous biofilm includes: Wherein, is the volume fraction of the porous biofilm, V b is the volume of the porous biofilm, V is the volume of hydrogen-consuming microorganisms, is the velocity of the fluid in the porous biofilm, is the rate of change of the velocity of the porous biofilm caused by the growth or decay of hydrogen-consuming microorganisms; is the density of the porous biofilm, and t is time.

[0028] Those skilled in the art can understand that the aggregate formed by combining hydrogen-consuming microorganisms and moisture is regarded as a porous microbial film, and hydrogen-consuming microorganisms and moisture can penetrate through the porous biofilm and move within the porous biofilm.

[0029] In some possible embodiments, the growth rate of the porous biofilm includes: Wherein, is the rate of change of the velocity of the porous biofilm caused by hydrogen-consuming microorganism i, is the growth rate of the porous biofilm of hydrogen-consuming microorganism i, is the endogenous decay rate of the porous biofilm, is the constant decay coefficient of the porous biofilm, is the volume fraction of the porous biofilm of hydrogen-consuming microorganism i, is the maximum growth rate of hydrogen-consuming microorganisms, is the molar concentration of dissolved component j, is the half-saturation constant of dissolved component j.

[0030] Since there are various hydrogen-consuming microorganisms in the underground hydrogen storage reservoir, the types of hydrogen-consuming microorganisms are counted by i, where i is a positive integer. Each type of hydrogen-consuming microorganism i will self-assemble to form a porous biofilm, and all types of hydrogen-consuming microorganisms together form a larger porous biofilm. By combining the growth-decay and mass transfer processes of various hydrogen-consuming microorganisms, the growth rate of the porous biofilm can be calculated, thereby monitoring the operation status of the underground hydrogen storage reservoir. In addition, the reaction between hydrogen-consuming microorganisms and hydrogen in the underground hydrogen storage reservoir will produce H 2 、CH 4 、CO 2 and other dissolved components, and these dissolved components will also affect the growth or decay of the porous biofilm, resulting in pressure changes in the underground hydrogen storage reservoir. When the dissolved component is only H 2 , the growth rate of the porous biofilm of hydrogen-consuming microorganism i is: where, is the molar concentration of the dissolved component H 2 , is the half-saturation constant of the dissolved component j; When the dissolved component is H 2 、CO 2 , the growth rate of the porous biofilm of hydrogen-consuming microorganism i is: where, is the molar concentration of the dissolved component H 2 , is the half-saturation constant of the dissolved component H 2 ; is the molar concentration of the dissolved component CO 2 , is the half-saturation constant of the dissolved component CO 2 ; When the dissolved component is H 2 、CH 4 、CO 2 , the growth rate of the porous biofilm of hydrogen-consuming microorganism i is: where, is the molar concentration of the dissolved component H 2 , is the half-saturation constant of the dissolved component H 2 ; is the molar concentration of the dissolved component CO 2 , is the half-saturation constant of the dissolved component CO 2 ; is the molar concentration of the dissolved component CH 4 , For dissolving component CH 4 The half-saturation constant of

[0031] In some possible embodiments, the momentum source term S of the pseudo-porous hydrated zone is: Wherein, is the effective permeability of the pseudo-porous hydrated zone, is the velocity of any phase in the porous biofilm, is the porosity of the pseudo-porous biofilm, is a non-zero constant, is a constant of the pseudo-porous hydrated zone.

[0032] In some possible embodiments, the multi-component fluid flow and mass transport equations include: Wherein, is the mass fraction of hydrogen-consuming microorganism i, is the diffusion flux vector of hydrogen-consuming microorganism i along the concentration and temperature gradients, is the net production rate of hydrogen-consuming microorganism i during the reaction process, is the source term of hydrogen-consuming microorganism i dissolved in the water gas, is the binary mass diffusion coefficient of hydrogen-consuming microorganism i in dissolved component j, is the thermal diffusion coefficient of hydrogen-consuming microorganism i, and T is the temperature.

[0033] In some possible embodiments, equations (1)-(7) are solved by simultaneous coupling to complete the establishment of the mathematical model of the hydrogen-consuming activity of microorganisms in depleted underground hydrogen storage reservoirs.

[0034] In some possible embodiments, the types of hydrogen-consuming microorganisms include at least one of methanogens, sulfate-reducing bacteria, syntrophic acetate-oxidizing bacteria, and iron-reducing bacteria.

[0035] Those skilled in the art can understand that the types of hydrogen-consuming microorganisms include at least one of methanogens, sulfate-reducing bacteria, syntrophic acetate-oxidizing bacteria, and iron-reducing bacteria. In the present invention, methanogens are taken as an example to apply and verify the constructed mathematical model, as Figures 2 - 6 shown, the evolution process of pore structure, permeability, gas components, and fluid flow mechanism during the growth-decay process of methanogens is simulated. By combining the simulation results with engineering practice, the types and contents of microbial communities are used as key monitoring indicators to effectively monitor the operation status of depleted oil and gas reservoirs as hydrogen storage reservoirs, ensuring the long-term stable and efficient operation of depleted oil and gas reservoirs as hydrogen storage reservoirs.

[0036] Specifically,Figure 2 Shows the schematic diagram of velocity vectors and contour lines of the volume fraction of porous biofilm - water layer at different times in a two - dimensional state porous medium model. Figure 3 Shows the schematic diagram of velocity vectors and contour lines of the volume fraction of porous biofilm - water layer at different times in a three - dimensional porous medium model. In the porous microbial film - water layer of water with an initial saturation of 0.2 and methanogens, gas can flow through its pores. As the porous biofilm - water layer grows, the cross - sectional area of the gas flow channel gradually decreases. After 90 days, the porous biofilm - water layer on the particle surface reaches its maximum. At this time, the gas velocity in the porous biofilm - water layer drops to zero, which also indicates that the growth of the microbial community will reduce the pore volume of the underground hydrogen storage reservoir, even block the pores, thereby reducing the injection - production capacity of the underground hydrogen storage reservoir and affecting the normal operation of the underground hydrogen storage reservoir.

[0037] Figure 4 Shows the schematic diagram of the relationship between normalized permeability and time and porosity in a porous medium model. Among them, the normalized permeability (KN) is the permeability at time t (Kt) divided by the absolute permeability of the porous medium at the initial time 0 (K0). Due to the net growth of the microbial community, KN decreases with the increase of time. When the growth of the porous biofilm - water layer reaches its maximum, the absolute permeability drops to about 0.25 times of the absolute permeability at the initial time 0. Further, with the increase of time, the porosity in the porous medium model increases, resulting in the blockage of pore space in the underground hydrogen storage reservoir, thereby reducing the effective storage volume of the underground hydrogen storage reservoir and the injection - production capacity of the underground hydrogen storage reservoir.

[0038] Figure 5 Shows the influence of the decay substrate of the microbial community on the hydrogen storage process of the underground hydrogen storage reservoir under different constant decay coefficients (b0) of different biomasses. In the porous medium model, the time required to reach the volume coefficient of the maximum microbial water film layer increases with the increase of b0, and a critical value b is assumed. At this time, the net increase of the microbial community is zero. When b0 exceeds the critical value b, the time required to reach the volume coefficient of the maximum microbial water film layer will be infinite.

[0039] Figure 6 Simulates the relationship between normalized permeability and time and porosity in different porous medium models, indicating that in different porous medium models, their normalized permeabilities are also different; when assuming that the growth process of the microbial community is uniform, the time required for different porous medium models to reach the maximum microbial carrying capacity is the same, and the decrease of the normalized permeability is related to the decay - growth mechanism of microorganisms and the pore structure in the underground hydrogen storage reservoir.

[0040] In summary, based on the phase change mechanism of biofilm growth-decay, microbial reactions, and mass transfer processes in the multi-component fluid flow of underground hydrogen storage, the present invention establishes a mathematical model of the hydrogen-consuming microbial activity in an underground hydrogen storage reservoir in a depleted gas reservoir considering microbial hydrogen consumption. Through the test results of numerical simulation, it accurately, effectively, and conveniently evaluates the blockage of pore space caused by the growth and decay of the microbial community, thereby clarifying the impact of the characteristics of hydrogen-consuming microbial activity on the long-term stable operation of the construction of an underground hydrogen storage reservoir in a depleted gas reservoir, making the evaluation system of influencing factors for the underground hydrogen storage reservoir in a depleted gas reservoir more perfect. The present invention is not only beneficial to the numerical simulation analysis of the indoor environment but also conducive to the popularization and application in the engineering field, and has a positive guiding significance for monitoring and evaluating the long-term stable and efficient operation of an underground hydrogen storage reservoir in a depleted gas reservoir.

[0041] Embodiment 2 Please refer to Figure 7 , Figure 7 , which is a schematic diagram of an embodiment of the electronic device 100 in the embodiment of the present invention, including: A memory 101, a processor 102, and a computer program 103 stored in the memory and executable on the processor. When the processor executes the computer program 103 stored in the memory, the above-mentioned evaluation method based on the numerical model of microbial hydrogen consumption in an underground hydrogen storage reservoir in a depleted gas reservoir is implemented.

[0042] For the sake of convenience of description, only the parts related to the embodiment of the present invention are shown. For the specific technical details not disclosed, please refer to the part of the evaluation method based on the numerical model of microbial hydrogen consumption in an underground hydrogen storage reservoir in a depleted gas reservoir in the embodiment of the present invention. The memory 101 can be used to store the computer program 103. The above computer program includes software programs, modules, and data. The processor 102 executes various functional applications and data processing of the electronic device by running and executing the computer program 103 stored in the memory 101.

[0043] Embodiment 3 The embodiment of the present invention also provides a computer-readable storage medium. Please refer to Figure 8 , Figure 8 , which is a schematic diagram of an embodiment of the computer-readable storage medium in the embodiment of the present invention. The computer-readable storage medium can store a computer program, and when the program is executed, it includes some or all of the steps of the evaluation method based on the numerical model of microbial hydrogen consumption in an underground hydrogen storage reservoir in a depleted gas reservoir recorded in the above method embodiment.

[0044] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described device, electronic device, and computer-readable storage medium can refer to the corresponding processes of the evaluation method based on the numerical model of microbial hydrogen consumption in an underground hydrogen storage reservoir in a depleted gas reservoir in the foregoing method embodiment, and will not be elaborated herein.

[0045] In several embodiments provided by the present application, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the system embodiments described above are merely illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of systems or units can be in electrical, mechanical or other forms.

[0046] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0047] In addition, in each embodiment of the present invention, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0048] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the evaluation method based on the numerical model of microbial hydrogen consumption in the depleted gas reservoir underground hydrogen storage in each embodiment of the present invention. And the aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks or optical discs that can store program codes.

[0049] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An evaluation method based on a numerical model of hydrogen consumption by microorganisms in underground hydrogen storage reservoirs of depleted gas reservoirs, characterized in that: The method comprises: Determining the type and content of hydrogen-consuming microorganisms in the depleted oil and gas reservoir according to geological information of the depleted oil and gas reservoir; According to the types of hydrogen-consuming microorganisms, a mathematical model of hydrogen-consuming activity of microorganisms in depleted underground hydrogen storage reservoirs is constructed; Performing two-dimensional porous media model verification calculation on the mathematical model; A three-dimensional porous media model is randomly generated based on the Monte Carlo method, and numerical simulation calculations are performed; Combined with the calculation results of the three-dimensional porous medium model, the activity status of hydrogen-consuming microorganisms in the underground hydrogen storage reservoir is analyzed to complete the monitoring of the operating status of the underground hydrogen storage reservoir and evaluate the safety of the underground hydrogen storage reservoir.

2. The evaluation method based on the numerical model of hydrogen consumption by microorganisms in underground hydrogen storage reservoirs of depleted gas reservoirs according to claim 1 is characterized in that: The mathematical model for constructing the hydrogen consumption activity of microorganisms in the depleted underground hydrogen storage reservoir comprises: A porous biofilm-water layer model is established based on the growth-decay mechanism of the hydrogen-consuming microorganisms in the underground hydrogen storage reservoir; Determining the growth rate of the porous biofilm based on the porous biofilm-water layer model and the mass balance equation of the porous biofilm; Combined with virtual porosity technology, a pseudo-porous hydrate zone is established to simulate the mass transfer process of the porous biofilm; Based on the reaction process of the hydrogen-consuming microorganisms, multi-component fluid flow and material transport equations in the porous biofilm are established.

3. The evaluation method based on the numerical model of hydrogen consumption by microorganisms in underground hydrogen storage reservoirs of depleted gas reservoirs according to claim 2 is characterized in that: The mass balance equation of the porous biofilm includes: in, is the volume fraction of porous biofilm, V b is the volume of the porous biofilm, V is the volume of hydrogen-consuming microorganisms, is the velocity of the fluid in the porous biofilm, The rate of change of the porous biofilm caused by the growth or decay of hydrogen-consuming microorganisms; is the density of the porous biofilm, and t is the time.

4. The evaluation method based on the numerical model of hydrogen consumption by microorganisms in underground hydrogen storage reservoirs of depleted gas reservoirs according to claim 3 is characterized in that: The growth rate of the porous biofilm includes: in, is the rate of change of the porous biofilm caused by hydrogen-consuming microorganism i, is the growth rate of the porous biofilm of hydrogen-consuming microorganism i, is the endogenous decay rate of the porous biofilm, is the constant attenuation coefficient of the porous biofilm, is the volume fraction of the porous biofilm of hydrogen-consuming microorganism i, is the maximum growth rate of hydrogen-consuming microorganisms, is the molar concentration of dissolved component j, is the half-saturation constant of dissolved component j.

5. The evaluation method based on the numerical model of hydrogen consumption by microorganisms in underground hydrogen storage reservoirs of depleted gas reservoirs according to claim 4 is characterized in that: The momentum source term S of the pseudo-porous hydration zone is: in, is the effective permeability of the pseudo-porous hydration zone, is the velocity of any phase in the porous biofilm, is the porosity of the pseudo-porous biofilm, is a non-zero constant, is the constant of the pseudo-porous hydration zone.

6. The evaluation method based on the numerical model of hydrogen consumption by microorganisms in underground hydrogen storage reservoirs of depleted gas reservoirs according to claim 5 is characterized in that: The multicomponent fluid flow and material transport equations include: in, is the mass fraction of hydrogen-consuming microorganism i, is the diffusion flux vector of hydrogen-consuming microorganism i with concentration and temperature gradient, is the net generation rate of hydrogen-consuming microorganism i during the reaction, is the source term of hydrogen-consuming microorganism i dissolved in water gas, is the binary mass diffusion coefficient of hydrogen-consuming microorganism i in dissolved component j, is the thermal diffusion coefficient of hydrogen-consuming microorganism i, and T is the temperature.

7. The evaluation method based on the numerical model of hydrogen consumption by microorganisms in underground hydrogen storage reservoirs of depleted gas reservoirs according to claim 6 is characterized in that: Formulas (1)-(7) are solved jointly and coupled to complete the establishment of a mathematical model of the hydrogen consumption activity of microorganisms in depleted underground hydrogen storage reservoirs.

8. The evaluation method based on the numerical model of hydrogen consumption by microorganisms in underground hydrogen storage reservoirs of depleted gas reservoirs according to claim 7 is characterized in that: The types of hydrogen-consuming microorganisms include at least one of methanogens, sulfate-reducing bacteria, acetic acid-synthesizing bacteria and iron-reducing bacteria.

9. An electronic device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is used to implement an evaluation method based on a numerical model of hydrogen consumption of microorganisms in underground hydrogen storage reservoirs of depleted gas reservoirs as described in any one of claims 1 to 8 when executing the computer program stored in the memory.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it implements the evaluation method based on the numerical model of hydrogen consumption by microorganisms in underground hydrogen storage reservoirs of depleted gas reservoirs as described in any one of claims 1 to 8.

Images