Method, device and equipment for determining underground coal gasification injection-production well pattern and medium

Abstract

The invention discloses a coal underground gasification injection-production well pattern determination method, device and equipment and a medium. The method comprises the steps that an injection well site is determined according to a gasification control area of a target reservoir development body, and an injection well bore structure is determined according to injection conditions and coal seam parameters corresponding to the gasification control area; determining a migration path concentration area and an enrichment area of preset generated gas, and determining a production well site according to the migration path concentration area and the enrichment area of the preset generated gas; and according to the injection well site, the injection well body structure and the production well site, coal underground gasification injection-production well pattern distribution of the target reservoir development body is determined. According to the technical scheme, by selecting the proper injection well site, the injection well body structure and the production well site, coal underground gasification injection-production well pattern distribution is determined, coal underground gasification injection-production well pattern deployment is achieved, and the coal seam combustion rate and the preset generated gas recovery rate are increased.

Description

Technical Field

[0001] This invention relates to the field of oil reservoir development technology, and in particular to a method, apparatus, equipment and medium for determining the injection-production well network of underground coal gasification. Background Technology

[0002] Underground coal gasification technology has significant environmental, safety, economic, and social value, and is one of the important directions for promoting the sustainable development of the coal industry and the transformation of the energy structure. Underground coal gasification (UCG) refers to the controlled combustion and gasification of underground coal. Through the thermal and chemical processes of coal, usable gaseous energy such as hydrogen and methane is produced, while pollutants such as coal gangue and carbon dioxide are left underground, further improving the extraction and utilization rate of coal resources.

[0003] Due to the relatively complex geological conditions of deep coal seams, including factors such as seam thickness, occurrence state, and coal quality, the reactions generated during gasification are difficult to fully control. This makes it difficult to control the combustion direction of underground coal gasification, affecting the recovery rate of deep underground coal gasification.

[0004] Existing underground coal gasification well network designs typically employ development methods such as "single production and single injection" or horizontal well networks to maximize coalbed methane production from coal combustion. These methods only consider how to ensure complete coal combustion, neglecting the recovery efficiency of the generated gas. Summary of the Invention

[0005] This invention provides a method, apparatus, equipment, and medium for determining the underground coal gasification injection-production well network, so as to realize the deployment of the underground coal gasification injection-production well network.

[0006] In a first aspect, embodiments of the present invention provide a method for determining a coal underground gasification injection-production well network, the method comprising:

[0007] The gasification control area of ​​the target reservoir development body is determined, the injection well site is determined based on the gasification control area of ​​the target reservoir development body, and the wellbore structure of the injection well is determined based on the injection conditions and coal seam parameters corresponding to the gasification control area. The gasification control area represents the area where underground combustion gasification of coal takes place.

[0008] The migration path concentration area and enrichment area of ​​the preset generated gas are determined, and the production well site is determined based on the migration path concentration area and enrichment area of ​​the preset generated gas; the injection well of the injection well site and the production well of the production well site are connected through the reservoir channel so that the preset generated gas flows to the production well.

[0009] Based on the injection well locations, injection well structure, and production well locations, the distribution of the coal underground gasification injection-production well network in the target reservoir development body is determined.

[0010] Secondly, embodiments of the present invention also provide a device for determining the underground coal gasification injection-production well network, the device comprising:

[0011] The injection well determination module is used to determine the gasification control area of ​​the target reservoir development body, determine the injection well location based on the gasification control area of ​​the target reservoir development body, and determine the injection well structure based on the injection conditions and coal seam parameters corresponding to the gasification control area. The gasification control area represents the area where underground combustion gasification of coal takes place.

[0012] The production well determination module is used to determine the concentration area and enrichment area of ​​the preset generated gas migration path, and determine the production well site based on the preset generated gas migration path concentration area and enrichment area; the injection well of the injection well site is connected to the production well of the production well site through a reservoir channel so that the preset generated gas flows to the production well.

[0013] The injection-production well network determination module is used to determine the distribution of the underground coal gasification injection-production well network of the target reservoir development body based on the injection well location, injection well structure, and production well location.

[0014] Thirdly, embodiments of the present invention also provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the method for determining the coal underground gasification injection-production well network as described in any of the embodiments of the present invention.

[0015] Fourthly, embodiments of the present invention also provide a storage medium for storing computer-executable instructions, which, when executed by a computer processor, are used to perform the method for determining the coal underground gasification injection-production well network as described in any of the embodiments of the present invention.

[0016] The technical solution of this invention determines the distribution of underground coal gasification injection-production well network by defining the injection well site, injection well structure, and production well site, thereby realizing the deployment of the underground coal gasification injection-production well network, improving the coal seam combustion rate and coalbed methane recovery rate, and reducing the drilling and development costs of injection-production wells.

[0017] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart of a method for determining the underground coal gasification injection-production well network according to Embodiment 1 of the present invention;

[0020] Figure 2 This is a schematic diagram of the flow field for deep underground coal gasification provided in Embodiment 1 of the present invention;

[0021] Figure 3 This is a schematic diagram of the distribution of deep coal underground gasification injection and production well network provided in Embodiment 1 of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of a coal underground gasification injection-production well network determination device provided in Embodiment 2 of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of an electronic device for implementing the method for determining the coal underground gasification injection-production well network according to an embodiment of the present invention. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0026] Example 1

[0027] Figure 1 The present invention provides a flowchart of a method for determining the injection-production well network for underground coal gasification. This embodiment is applicable to the determination of the injection-production well network for underground coal gasification. The method can be executed by a device for determining the injection-production well network for underground coal gasification. This device can be implemented in hardware and / or software and can be configured in any electronic device with network communication and computing capabilities.

[0028] like Figure 1 As shown, the method for determining the underground coal gasification injection-production well network includes:

[0029] S110. Determine the injection well site based on the gasification control area of ​​the target reservoir development body, and determine the wellbore structure based on the injection conditions and coal seam parameters corresponding to the gasification control area. The gasification control area represents the area where coal undergoes underground combustion and gasification.

[0030] In this embodiment of the application, the target reservoir development body refers to the development unit in the target reservoir to be developed. The gasification control area typically includes natural gas storage tanks, gasification equipment and control systems, etc., and is an area used for coal combustion gasification and for monitoring and controlling the combustion gasification process.

[0031] In practical applications, the target reservoir development body can be determined by obtaining the boundary of the oil and gas reservoir through seismic data, obtaining the main development layer of the oil and gas reservoir based on the exploration well parameters, and establishing the largest geometric body within the main development layer as the target reservoir development body.

[0032] It should be noted that the injection well site should be selected with consideration of the degree of utilization of deep coal combustion and gasification, and the deep coal combustion and gasification is a prerequisite for improving the utilization rate.

[0033] In the deep underground coal gasification process, the combustion of coal is the driving force of the gasification reaction, which is the process of converting coal into combustible gases. Under normal circumstances, underground coal reacts with injected gasifying agents (such as water vapor, carbon dioxide, or oxygen) to produce combustible gases such as hydrogen monoxide and hydrogen. These combustible gases are then transported to a certain area for extraction through underground reservoir fractures or channels.

[0034] The optimal injection conditions are determined by the deep coal combustion and gasification reaction, and the wellbore structure is determined based on the injection conditions and coal seam parameters.

[0035] As an optional but not limited implementation, the gasification control region of the target reservoir development body is determined, including:

[0036] A geological model of the target reservoir development body is determined, and data analysis is performed based on the geological model to determine the gasification control zone in the target reservoir development body; the geological model includes the porosity, permeability and saturation of the target reservoir development body.

[0037] In this embodiment, relevant data on deep coal reservoirs are collected and organized, including but not limited to seismic data and well parameters. Through analysis of this data, the reservoir boundaries, the main development layers, and the largest geometric body within the main development layers are identified as the target reservoir development body.

[0038] The geological model of the target reservoir development body can be determined by collecting and organizing geological observation data, seismic data, exploration well data, etc. to obtain the porosity, permeability and saturation of the target reservoir development body, and constructing a three-dimensional or two-dimensional model of the target reservoir development body using mathematical and physical theories or methods.

[0039] The geological model includes the porosity, permeability, and saturation of the target reservoir development body. By using the porosity, permeability, and saturation data in the geological model of the target reservoir development body, more suitable areas can be selected for underground coal combustion.

[0040] Higher porosity facilitates air permeation and oxygen supply, providing better conditions for coal combustion and promoting the combustion reaction. Higher permeability helps gas flow and heat transfer, enabling more uniform and continuous combustion, while also facilitating the emission of combustion products. Water saturation affects the combustion characteristics of coal; high water saturation may inhibit combustion and reduce efficiency, while lower saturation is more conducive to combustion.

[0041] Based on data analysis using the geological model of the target reservoir development body, areas with high coal quality and density, high combustion efficiency, and low combustion risk are selected as gasification control zones for the target reservoir development body. Simultaneously, the connectivity and stability of the selected areas must be considered to ensure the smooth progress of the underground coal combustion and gasification process.

[0042] As an optional but not limited implementation, the injection well site is determined based on the gasification control zone of the target reservoir development body, including:

[0043] The injection well site is determined based on the center point of the gasification control zone of the target reservoir development body.

[0044] In this embodiment of the application, the injection well site should be selected as the center point or key point of the gasification control area in order to achieve effective control over the entire target reservoir development body area.

[0045] As an optional but not limited implementation, the wellbore structure of the injection well is determined based on the injection conditions and coal seam parameters corresponding to the gasification control zone, including:

[0046] Combustion efficiency simulation is performed on the gasification control region to determine the injection conditions corresponding to the gasification control region;

[0047] The wellbore structure of the injection well is determined based on the injection conditions and coal seam parameters.

[0048] In this embodiment of the application, combustion efficiency is simulated in a selected gasification control area using combustion simulation software or algorithms, or the influence of various factors on combustion efficiency during underground coal combustion is studied by establishing mathematical models and numerical simulation methods.

[0049] Specifically, during the combustion efficiency simulation of the selected gasification control area, the impact of various factors on combustion efficiency was assessed by introducing different injection conditions. After multiple combustion efficiency simulations and optimizations, the optimal injection conditions were determined, enabling the underground coal resources in the gasification control area to complete the full combustion process in the shortest possible time.

[0050] Among them, the wellbore structure of the injection well can improve the recovery rate of deep underground coal gasification, and determining a suitable wellbore structure can support efficient coal combustion and generated gas collection.

[0051] The wellbore structure is determined based on coal seam parameters and injection conditions. Coal seam parameters directly determine the wellbore structure, while injection conditions have a long-term impact on it.

[0052] As an optional but not limited implementation, the coal seam parameters include at least one of the following: coal seam thickness, coal seam stability, coal seam pressure, and coal seam temperature. The injection conditions refer to the injection pressure, injection rate, and injection gas composition for the deep underground coal in the gasification control area to complete combustion in the shortest time. The injection well structure includes the depth, support, well material, and casing layers of the injection well.

[0053] Specifically, coal seam parameters and injection conditions jointly influence the wellbore structure. Coal seam thickness affects the wellbore depth; a thicker coal seam requires a deeper wellbore to ensure the gasifying agent can fully penetrate the coal seam and promote combustion and gasification reactions in deeper coal layers. Coal seam stability affects the wellbore's support; less stable coal seams require a wellbore structure with stronger support capabilities.

[0054] In addition, the composition of the injected gas, the injection pressure, and the injection temperature have a significant impact on the selection and service life of the injection well shaft material. For example, high-temperature and high-pressure injection conditions require the injection well shaft material to have good high-temperature resistance and corrosion resistance.

[0055] Secondly, the casing layer is closely related to factors such as coal seam pressure and rock mechanical properties. A wellbore structure with a reasonable casing layer can effectively prevent formation fracturing and formation fracturing at the casing, ensuring the integrity and safety of the wellbore structure.

[0056] S120. Determine the concentration area and enrichment area of ​​the preset generated gas migration path, and determine the production well site based on the preset generated gas migration path concentration area and enrichment area; the injection well of the injection well site and the production well of the production well site are connected through a reservoir channel so that the preset generated gas flows to the production well.

[0057] In this embodiment, after deep underground coal combustion and gasification at the injection well site, a predetermined generated gas is obtained. This generated gas migrates and accumulates in fractures or pores within the reservoir. Determining the production well site based on the migration path concentration area and enrichment area of ​​the predetermined generated gas can effectively improve the recovery rate of the predetermined generated gas.

[0058] As an optional but not limited implementation, the predetermined migration path concentration region and enrichment region of the generated gas are determined, including:

[0059] The migration direction of the preset generated gas is determined based on the flow parameters of the preset generated gas under the action of pressure and temperature fields; the flow parameters include the seepage velocity and seepage flow rate of the preset generated gas.

[0060] Based on the migration direction, the injection well site, and the topographic parameters of the target reservoir development body, the concentration and enrichment areas of the preset generated gas migration path are determined by simulation software and algorithms; the injection well site is the starting point of the preset generated gas migration path, and the topographic parameters represent the topographic height of the target reservoir development body.

[0061] In this embodiment of the application, in deep coal combustion gasification, the migration of the pre-generated gas is mainly based on the flow parameters under the action of the pressure field and the temperature field, which are the seepage velocity of the pre-generated gas under the action of the pressure field and the seepage flow rate of the pre-generated gas under the action of the temperature field, respectively.

[0062] Specifically, the seepage velocity of the pre-generated gas under the action of the pressure field is calculated using the following formula:

[0063]

[0064] V is the preset seepage velocity of the generated gas, in m / s; k is the gas permeability coefficient, in m. 2 ΔP / Δx is the ratio of the pressure difference along the flow direction to the length, i.e., the pressure gradient, in Pa / m.

[0065] Specifically, the seepage flow rate of the pre-generated gas under the influence of the temperature field is calculated using the following formula:

[0066] Q = hAΔT;

[0067] Where Q is the preset percolation flow rate of the generated gas, in W; h is the convective heat transfer coefficient, in W / (m²·K); and A is the heat transfer area, in m². 2 ΔT is the temperature difference, in K.

[0068] Based on the seepage velocity of the pre-defined generated gas under the influence of the pressure field and the seepage flow rate of the pre-defined generated gas under the influence of the temperature field, the migration law or migration direction of the pre-defined generated gas is obtained. Based on the migration direction, the location information of the injection well site, and the topographic parameters of the target reservoir development body, the simulation results of the pre-defined generated gas migration process are determined using gas migration simulation software and algorithms. Through analysis of the simulation results, the concentrated and enriched areas of the pre-defined generated gas migration path within the target reservoir development body are identified.

[0069] As an optional but not limited implementation, the production well site is determined based on the preset migration path concentration area and enrichment area of ​​the generated gas, including:

[0070] When there is a convergence point in the concentrated area of ​​the preset generated gas migration path, the production well site is determined at the convergence point, and the convergence point represents the first confluence point in the concentrated area of ​​the preset generated gas migration path.

[0071] When the preset generated gas concentration in the enriched region exceeds the concentration threshold, a production well site is determined in the enriched region.

[0072] In this embodiment, it is understood that generated gas can be effectively collected in areas where the predetermined generated gas migration path is concentrated. Selecting production well sites within these concentrated migration path areas ensures that the predetermined generated gas can flow smoothly to the production wells. Simultaneously, due to the low-pressure environment of the production wells, a significant pressure gradient can be formed with the high-pressure environment surrounding the injection wells, controlling the subsequent fluid migration direction of the predetermined generated gas and thus improving collection efficiency. Selecting production well sites within areas rich in the predetermined generated gas ensures that each production well can collect a high concentration of the predetermined generated gas, thereby improving the recovery rate.

[0073] Specifically, if there is significant convergence along the predetermined gas migration path, production well sites can be deployed at the convergence points based on well spacing constraints. This allows for direct and effective extraction of the gas at these concentrated migration points, and the pressure gradient further controls the migration direction and extraction efficiency of the predetermined gas, thereby improving extraction efficiency. Furthermore, when enriched areas are concentrated and large in scale, enriched areas with predetermined gas concentrations exceeding a certain threshold are selected, and multiple production well sites are deployed within or around these areas to fully utilize the enriched resources and improve recovery rates.

[0074] See Figure 2 This is a schematic diagram of the flow field in deep underground coal gasification. The diagram includes one injection well and two production wells (harvesting wells). Centered on the injection well, the area can be divided into combustion, gasification, and pyrolysis zones. Based on the seepage velocity of the pre-generated gas under the influence of the pressure field and the seepage flow rate under the influence of the temperature field, the migration direction and pattern of the pre-generated gas are obtained. Under the influence of the temperature field formed by coal combustion near the injection wellhead, the pre-generated gas migrates outwards along the direction of the maximum geothermal gradient. The streamline direction indicates that the pre-generated gas migrates from the combustion center outwards. Due to the dip angle of the target reservoir development body, when the temperature gradient is not significant, the pressure gradient controls the migration direction of the pre-generated gas, causing it to migrate from lower elevation areas (southern part) to higher elevation areas (northern part).

[0075] S130. Based on the injection well locations, injection well structure, and production well locations, determine the distribution of the coal underground gasification injection-production well network in the target reservoir development body.

[0076] In this embodiment, the underground coal gasification injection-production well network is determined by the injection well site, the injection well structure, and the production well site, so that the underground coal gasification injection-production well network can improve the underground combustion and gasification efficiency of coal, while also improving the collection efficiency and recovery rate.

[0077] See Figure 3 This is a schematic diagram of the distribution of injection and production wells for deep underground coal gasification. The diagram includes one injection well and two production wells (collection wells), which is a vertical well structure of "one injection and multiple collection". The bottoms of the injection and production wells are connected by channels in gray, so that the pre-generated gas can be transported to the production wells through the channels.

[0078] The technical solution of this invention, by selecting suitable injection well sites, injection well structure and production well sites, realizes the deployment of underground coal gasification injection and production well network, improves coal combustion efficiency, and presets the generated gas collection efficiency and recovery rate.

[0079] Example 2

[0080] Figure 4This is a schematic diagram of a coal underground gasification injection-production well network determination device provided in Embodiment 2 of the present invention. This embodiment is applicable to the determination of coal underground gasification injection-production well networks. This coal underground gasification injection-production well network determination device can be implemented in hardware and / or software, and can be configured in any electronic device with network communication and computing capabilities. For example... Figure 4 As shown, the device includes:

[0081] The injection well determination module 310 is used to determine the gasification control area of ​​the target reservoir development body, determine the injection well location based on the gasification control area of ​​the target reservoir development body, and determine the injection well structure based on the injection conditions and coal seam parameters corresponding to the gasification control area. The gasification control area represents the area where underground combustion gasification of coal takes place.

[0082] The production well determination module 320 is used to determine the concentration area and enrichment area of ​​the preset generated gas migration path, and determine the production well site based on the preset generated gas migration path concentration area and enrichment area; the injection well of the injection well site is connected to the production well of the production well site through a reservoir channel so that the preset generated gas flows to the production well.

[0083] The injection-production well network determination module 330 is used to determine the distribution of the coal underground gasification injection-production well network of the target reservoir development body based on the injection well location, injection well structure and production well location.

[0084] Optionally, the injection well determination module 310 includes:

[0085] The gasification control area determination unit is used to determine the geological model of the target reservoir development body, and to perform data analysis based on the geological model to determine the gasification control area in the target reservoir development body; the geological model includes the porosity, permeability and saturation of the target reservoir development body.

[0086] Optionally, the injection well determination module 310 includes:

[0087] The injection well site determination unit is used to determine the injection well site based on the center point of the gasification control zone of the target reservoir development body.

[0088] Optionally, the injection well determination module 310 includes:

[0089] An injection condition determination unit is used to simulate the combustion efficiency of the gasification control region and determine the injection conditions corresponding to the gasification control region.

[0090] The injection well structure determination unit is used to determine the injection well structure based on the injection conditions and coal seam parameters.

[0091] Optionally, the coal seam parameters include at least one of the following: coal seam thickness, coal seam stability, coal seam pressure, and coal seam temperature. The injection conditions refer to the injection pressure, injection rate, and injection gas composition required for the deep underground coal in the gasification control area to complete combustion in the shortest time. The injection well structure includes the depth, support, well material, and casing layers of the injection well.

[0092] Optionally, the production well determination module 320 includes:

[0093] The migration direction determination unit is used to determine the migration direction of the preset generated gas based on the flow parameters of the preset generated gas under the action of a pressure field and a temperature field; the flow parameters include the seepage velocity and seepage flow rate of the preset generated gas.

[0094] The migration path concentration area and enrichment area determination unit is used to determine the preset generated gas migration path concentration area and enrichment area based on the migration direction, the injection well site, and the terrain parameters of the target reservoir development body, through simulation software and algorithms; the injection well site is the starting point of the preset generated gas migration path, and the terrain parameters represent the terrain height of the target reservoir development body.

[0095] Optionally, the production well determination module 320 includes:

[0096] The production well site determination unit is used to determine the production well site at the convergence point when there is a convergence point in the concentrated area of ​​the preset generated gas migration path, wherein the convergence point represents the first confluence point in the concentrated area of ​​the preset generated gas migration path.

[0097] The production well site determination unit is used to determine the production well site in the enrichment region when the preset generated gas concentration in the enrichment region exceeds the concentration threshold.

[0098] The coal underground gasification injection-production well network determination device provided in this embodiment of the invention can execute the coal underground gasification injection-production well network determination method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0099] Example 3

[0100] Figure 5A schematic diagram of an electronic device 10 that can be used to implement embodiments of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0101] like Figure 5 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 may also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0102] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0103] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, central processing units (CPUs), graphics processing units (GPUs), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as the method for determining the injection-production well pattern in underground coal gasification.

[0104] In some embodiments, the method for determining the underground coal gasification injection-production well pattern can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the method for determining the underground coal gasification injection-production well pattern described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to perform the method for determining the underground coal gasification injection-production well pattern by any other suitable means (e.g., by means of firmware).

[0105] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0106] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0107] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0108] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0109] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0110] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0111] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0112] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for determining the injection-production well pattern for underground coal gasification, characterized in that, include: The gasification control area of ​​the target reservoir development body is determined, the injection well site is determined based on the gasification control area of ​​the target reservoir development body, and the wellbore structure of the injection well is determined based on the injection conditions and coal seam parameters corresponding to the gasification control area. The gasification control area represents the area where underground combustion gasification of coal takes place. Determine the concentration and enrichment areas of the preset generated gas migration path, and determine the production well site based on the preset generated gas migration path concentration and enrichment areas; The injection well at the injection well site and the production well at the production well site are connected through a reservoir channel to direct a preset gas flow to the production well. Based on the injection well locations, injection well structure, and production well locations, the distribution of the coal underground gasification injection-production well network in the target reservoir development body is determined.

2. The method according to claim 1, characterized in that, Determine the gasification control zone of the target reservoir development body, including: A geological model of the target reservoir development body is determined, and data analysis is performed based on the geological model to determine the gasification control zone in the target reservoir development body; the geological model includes the porosity, permeability and saturation of the target reservoir development body.

3. The method according to claim 1, characterized in that, Determine injection well sites based on the gasification control zone of the target reservoir development body, including: The injection well site is determined based on the center point of the gasification control zone of the target reservoir development body.

4. The method according to claim 1, characterized in that, The wellbore structure of the injection well is determined based on the injection conditions and coal seam parameters corresponding to the gasification control zone, including: Combustion efficiency simulation is performed on the gasification control region to determine the injection conditions corresponding to the gasification control region; The wellbore structure of the injection well is determined based on the injection conditions and coal seam parameters.

5. The method according to claim 1, characterized in that, Identify the concentration and enrichment regions of the pre-defined migration paths for the generated gas, including: The migration direction of the preset generated gas is determined based on the flow parameters of the preset generated gas under the action of pressure and temperature fields; the flow parameters include the seepage velocity and seepage flow rate of the preset generated gas. Based on the migration direction, the injection well site, and the topographic parameters of the target reservoir development body, the concentration and enrichment areas of the preset generated gas migration path are determined by simulation software and algorithms; the injection well site is the starting point of the preset generated gas migration path, and the topographic parameters represent the topographic height of the target reservoir development body.

6. The method according to claim 1, characterized in that, Based on the predetermined migration path concentration area and enrichment area of ​​the generated gas, the production well site is determined, including: When there is a convergence point in the concentrated area of ​​the preset generated gas migration path, the production well site is determined at the convergence point, and the convergence point represents the first confluence point in the concentrated area of ​​the preset generated gas migration path. When the preset generated gas concentration in the enriched region exceeds the concentration threshold, a production well site is determined in the enriched region.

7. The method according to claim 1, characterized in that, The formation parameters include at least one of the following: coal seam thickness, coal seam stability, coal seam pressure, and coal seam temperature. The injection conditions refer to the injection pressure, injection rate, and injection gas composition required for the deep underground coal in the gasification control area to complete combustion in the shortest time. The injection well structure includes the depth, support, well material, and casing layers of the injection well.

8. A device for determining the underground coal gasification injection-production well network, characterized in that, include: The injection well determination module is used to determine the gasification control area of ​​the target reservoir development body, determine the injection well location based on the gasification control area of ​​the target reservoir development body, and determine the wellbore structure based on the injection conditions and coal seam parameters corresponding to the gasification control area. The gasification control area represents the area where coal undergoes underground combustion and gasification. The formation parameters include at least one of the following: coal seam thickness, coal seam stability, coal seam pressure, and coal seam temperature. The production well determination module is used to determine the concentration area and enrichment area of ​​the preset generated gas migration path, and to determine the production well location based on the preset generated gas migration path concentration area and enrichment area. The injection well at the injection well site and the production well at the production well site are connected through a reservoir channel to direct a preset gas flow to the production well. The injection-production well network determination module is used to determine the distribution of the underground coal gasification injection-production well network of the target reservoir development body based on the injection well location, injection well structure, and production well location.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method for determining the coal underground gasification injection-production well network as described in any one of claims 1-7.

10. A storage medium for storing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a computer processor, are used to perform the method for determining the coal underground gasification injection-production well network as described in any of claims 1-7.

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