A gas field wastewater reinjection well selection method and device based on plane radial flow

Abstract

The present application relates to the technical field of oil and gas field development, and discloses a method and device for selecting gas field wastewater reinjection wells based on plane radial flow. The method comprises obtaining engineering implementation data for each proposed wastewater reinjection well; optimizing and screening the proposed reinjection wells; calculating the current gas field water production, establishing a relationship curve between injection volume and injection pressure based on plane radial flow, determining the bottom hole flow pressure corresponding to the injection volume of each candidate wastewater reinjection well when the current gas field water production volume is reached; determining the bottom hole flow pressure corresponding to each candidate wastewater reinjection well during the peak period of gas field water production; determining the wastewater space that each candidate wastewater reinjection well can accommodate; and optimizing and ranking the candidate wastewater reinjection wells. The present application introduces quantitative parameters for wastewater reinjection well selection, which is conducive to ensuring the smooth implementation of wastewater reinjection after well selection.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas field development, specifically to wastewater treatment in natural gas development, and more particularly to a method and device for selecting gas field wastewater reinjection wells based on planar radial flow. Background Art

[0002] During the production and exploitation of oil and gas fields, a large amount of production wastewater is generated, which needs to be treated before discharge. Currently, the most common wastewater treatment method in gas field development, both domestically and internationally, is to reinject the treated wastewater into the formation. This not only solves the wastewater discharge problem but also helps maintain formation pressure in the gas reservoir.

[0003] However, in the current research on gas field wastewater reinjection, the most common ones are wastewater treatment and wastewater harmlessness research, but there are fewer studies on the selection of injection wells, formation water absorption capacity, reinjection pressure, etc., and people generally tend to directly convert low-yield wells and low-pressure wells into wastewater reinjection wells. When evaluating and selecting wastewater reinjection wells, they directly use the wellhead pressure as an indicator to select the well with the lowest pressure for reinjection. Since it is impossible to accurately calculate the formation water absorption capacity, injection volume and other parameters, the process of selecting wastewater reinjection wells often results in reinjection failure due to reasons such as excessive pressure during the reinjection process and insufficient underground volume space. Summary of the Invention

[0004] In order to solve the problems and shortcomings existing in the above-mentioned prior art, this application proposes a method and device for selecting gas field wastewater reinjection wells based on planar radial flow, and introduces quantitative parameters for selecting wastewater reinjection wells, which is conducive to ensuring the smooth implementation of wastewater reinjection after well selection.

[0005] In order to achieve the above-mentioned invention objectives, the technical solutions of this application are as follows:

[0006] A gas field wastewater reinjection well selection method based on plane radial flow, comprising:

[0007] Obtain engineering implementation data for each planned sewage reinjection well;

[0008] Optimal selection and investigation of planned reinjection wells;

[0009] Calculate the current gas field water production, establish a relationship curve between injection volume and injection pressure based on plane radial flow, and determine the bottom hole flow pressure corresponding to the injection volume of each alternative wastewater reinjection well when the injection volume is the current gas field water production;

[0010] Determine the bottom hole flow pressure corresponding to each alternative wastewater reinjection well during the peak water production period of the gas field;

[0011] Determine the sewage accommodating space of each alternative sewage reinjection well;

[0012] Optimal ranking of alternative sewage reinjection wells.

[0013] Furthermore, the engineering implementation data includes well logging data, mud logging data, drilling data, drilling core data, production pressure data of the gas field where the sewage reinjection well is located, and gas field water production data.

[0014] Furthermore, the proposed sewage reinjection well is preferably checked and investigated, including:

[0015] Taking into account the available reinjection layers of the gas field, and on the premise of meeting the environmental protection requirements of the gas field, all wells that may implement wastewater reinjection are checked and organized as alternative wastewater reinjection wells.

[0016] Furthermore, the determination of the bottom hole flow pressure corresponding to the injection amount of each candidate wastewater reinjection well being equal to the current gas field water production includes:

[0017] First, the calculation expression of plane radial flow is as follows

[0018] Formula (1);

[0019] Assume that the current water production of the gas field is According to the plane radial flow formula, we have

[0020] Formula (2);

[0021] in, The water production of the gas field is The bottom flow pressure of the sewage reinjection well is is the viscosity of the reinjected wastewater, is the wellbore radius, is the sweep radius of the reinjection well, is the permeability of the reinjection well reservoir to the injected wastewater, is the reservoir thickness of the reinjection well, is the formation pressure.

[0022] Furthermore, the determination of the formation pressure corresponding to each candidate wastewater reinjection well during the peak water production period of the gas field includes:

[0023] Through numerical simulation, it is found that the peak water production of the gas field occurs in the The peak water production in that year was , the calculation expression of plane radial flow is

[0024] Formula (3);

[0025] in, is the bottom hole flow pressure corresponding to the wastewater reinjection well during the peak period of gas field water production, is the viscosity of the reinjected wastewater, is the wellbore radius, is the sweep radius of the reinjection well, is the permeability of the reinjection well reservoir to the injected wastewater, is the reservoir thickness of the reinjection well, is the formation pressure in that year.

[0026] Furthermore, the step of determining the sewage accommodating space of each candidate sewage reinjection well includes:

[0027] The cumulative water production of the gas field is simulated by numerical simulation method, and according to the principle of material balance,

[0028] Formula (4);

[0029] in, is the volume of underground available space, is the underground space volume occupied by the produced gas, For produced groundwater, is the surface volume of produced gas, is the gas compressibility coefficient.

[0030] Furthermore, the preferred sorting of the candidate sewage reinjection wells includes:

[0031] Eliminate the alternative sewage reinjection wells whose sewage accommodating space is less than the cumulative water production;

[0032] Comprehensive consideration to select the current bottom hole pressure of the reinjection well The pressure difference between the bottom hole flow pressure during the peak period of water injection and the bottom hole flow pressure of the current reinjection well the smallest well;

[0033] Set parameters , and finally select the parameters The smallest well is the optimal sewage reinjection well.

[0034] A gas field wastewater reinjection well selection device based on plane radial flow, comprising:

[0035] A data acquisition module is used to obtain engineering implementation data of each planned sewage reinjection well;

[0036] The first data processing module is used for selecting and troubleshooting the proposed reinjection wells;

[0037] The second data processing module is used to calculate the current water production of the gas field, establish a relationship curve between the water injection rate and the water injection pressure based on the plane radial flow, and determine the bottom hole flow pressure corresponding to the injection rate of each alternative wastewater reinjection well when the injection rate is the current water production of the gas field;

[0038] The third data processing module is used to determine the bottom hole flow pressure corresponding to each alternative wastewater injection well during the peak water production period of the gas field;

[0039] A fourth data processing module is used to determine the sewage accommodating space of each candidate sewage reinjection well;

[0040] The result sorting and output module is used to prioritize the candidate sewage reinjection wells and output the results.

[0041] A computer device includes a memory, a processor, and a computer program stored in the memory and executable in the processor. When the processor executes the computer program, the above-mentioned gas field wastewater reinjection well selection method based on planar radial flow is implemented.

[0042] A computer-readable storage medium stores a computer program, which, when executed in a computer processor, implements the above-mentioned gas field wastewater reinjection well selection method based on planar radial flow.

[0043] Beneficial effects of this application:

[0044] This application quantifies the difference between the future injection fluid volume and the formation pressure through the plane radial flow formula, calculates the formation water absorption capacity, injection volume and injection flow pressure, introduces parameters to compare the reinjection pressure difference of each well, and finally selects the optimal sewage reinjection well from several spare wells, which is conducive to ensuring the smooth implementation of sewage reinjection after well selection. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The foregoing and following detailed description of the present application will become more apparent when read in conjunction with the following drawings, in which:

[0046] Figure 1 This is a flow chart of the application method;

[0047] Figure 2 This is a structural diagram of the device of this application;

[0048] Figure 3 This is the bottom hole pressure prediction diagram of the proposed water injection well in the S gas field at the current water production rate;

[0049] Figure 4 This is the annual water production of each well in the S gas field and the prediction diagram of the pumping pressure of different wells;

[0050] Figure 5 This is the predicted maximum bottom hole pressure of the planned water injection wells in the S gas field over the years;

[0051] Figure 6 This is the prediction map of the maximum accommodation space for the proposed water injection wells in the S gas field;

[0052] Figure 7 This is the prediction diagram of parameter D of the proposed water injection well in S gas field. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the technical solutions in this application, the following will further illustrate the technical solutions for achieving the invention purpose of this application through several specific embodiments. It should be noted that the technical solutions claimed for protection in this application include but are not limited to the following embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative work should fall within the scope of protection of this application.

[0054] Example 1

[0055] Among the current studies on wastewater reinjection in gas fields, the most common ones are wastewater treatment and wastewater harmlessness research, but there are fewer studies on the selection of injection wells and the water absorption capacity of formations. When reinjecting wastewater, there is a general tendency to directly convert low-yield wells and low-pressure wells into wastewater reinjection wells. When evaluating and selecting wastewater reinjection wells, the wellhead pressure is directly used as an indicator to select the well with the lowest pressure for reinjection. Therefore, reinjection failures often occur due to reasons such as excessive pressure during the reinjection process and insufficient underground volume space.

[0056] Based on this, this embodiment provides a method and device for selecting gas field wastewater reinjection wells based on planar radial flow. By introducing quantitative parameters to select wastewater reinjection wells, it is beneficial to ensure the smooth implementation of wastewater reinjection after well selection.

[0057] In order to facilitate the understanding of this embodiment, a method for selecting a gas field wastewater reinjection well based on planar radial flow disclosed in an embodiment of the present application is first introduced in detail.

[0058] First, the professional terms involved in the embodiments of this application are explained:

[0059] Bottomhole pressure: Bottomhole pressure is the abbreviation of bottomhole flow pressure, which is the bottomhole pressure during oil and gas well production. It indicates the remaining pressure after oil and gas flow from the formation to the bottom of the well. For self-flowing wells, it is also the starting pressure of oil and gas flowing from the bottom of the well to the ground.

[0060] Reinjection well sweep radius: refers to the circle in which the water injected by the injection well spreads in the formation under ideal homogeneous formation conditions. The radius of the circle is called the injection well sweep radius.

[0061] The embodiment of the present application discloses a method for selecting a gas field wastewater reinjection well based on plane radial flow. Figure 1 , the method specifically comprises the following steps:

[0062] Step S101, obtaining engineering implementation data such as well logging data, mud logging data, drilling data, drilling core data, production pressure data of the gas field where the sewage reinjection well is located, and gas field water production data of each planned sewage reinjection well.

[0063] Step S102: Optimize and check the planned reinjection wells.

[0064] Taking into account the available reinjection layers of the gas field, and on the premise of meeting the environmental protection requirements of the gas field, all wells that may implement wastewater reinjection are checked and organized as alternative wastewater reinjection wells.

[0065] Step S103: Count the current gas field water production, establish a relationship curve between injection volume and injection pressure based on plane radial flow, and determine the bottom hole flow pressure corresponding to the injection volume of each alternative sewage reinjection well when the injection volume is the current gas field water production.

[0066] First, the calculation expression of plane radial flow is as follows

[0067] Formula (1);

[0068] Assume that the current water production of the gas field is , then according to the plane radial flow formula we have

[0069] Formula (2);

[0070] in, The water production of the gas field is The bottom flow pressure of the sewage reinjection well is in units of ; is the viscosity of the reinjected sewage, in units of ; is the wellbore radius, in units of ; is the sweep radius of the reinjection well, in units of ; is the permeability of the reinjection well reservoir to the injected wastewater, in units of ; is the reservoir thickness of the reinjection well, in units of ; is the formation pressure, in units of .

[0071] Step S104: Determine the bottom hole flow pressure corresponding to each candidate wastewater reinjection well during the peak water production period of the gas field.

[0072] Through numerical simulation, it is found that the peak water production of the gas field occurs in the The peak water production in that year was , for production needs, the injection volume of sewage reinjection wells Should be greater than or equal to the peak water production of the gas field , the water production during the peak period of gas field water production All injected into the well, the plane radial flow calculation expression is:

[0073] Formula (3);

[0074] in, is the bottom hole flow pressure corresponding to the wastewater reinjection well during the peak period of gas field water production, in units of ; is the viscosity of the reinjected sewage, in units of ; is the wellbore radius, in units of ; is the sweep radius of the reinjection well, in units of ; is the permeability of the reinjection well reservoir to the injected wastewater, in units of ; is the reservoir thickness of the reinjection well, in units of ; is the formation pressure in that year, in units of .

[0075] Step S105: Determine the sewage accommodating space of each candidate sewage reinjection well.

[0076] The first is the pore volume occupied by gas under the original formation pressure; the second is the space increased by compression of water and rock skeleton in the reservoir under the water injection pressure difference (due to the small compression coefficient, it can be basically ignored); the third is the volume of water produced during the production process (due to the small compression coefficient of water, the surface and underground volumes are regarded as the same).

[0077] The cumulative water production of the gas field is simulated by numerical simulation method, and according to the principle of material balance,

[0078] Formula (4);

[0079] in, is the volume of underground available space, in units of ; is the underground space volume occupied by the produced gas, in units of ; is the produced groundwater, in units of ; is the surface volume of produced gas, in units of ; is the gas compressibility coefficient, dimensionless;

[0080] is the volume of available underground space, which also represents the space that each alternative sewage reinjection well can accommodate sewage.

[0081] Step S106: Optimizing and sorting the candidate sewage reinjection wells.

[0082] Through the calculations in the above steps, first remove the candidate sewage reinjection wells whose sewage accommodating space is less than the cumulative water production;

[0083] When sewage is reinjected, the injection flow pressure should be relatively low, and the subsequent flow pressure change should also be relatively small. Therefore, considering the two factors of injection flow pressure and subsequent flow pressure change, the current injection well bottom flow pressure is first selected from several alternative sewage reinjection wells. The pressure difference between the bottom hole flow pressure during the peak period of water injection and the bottom hole flow pressure of the current reinjection well the smallest well;

[0084] After considering the above two factors, set the parameters To measure the weighted value of the two factors, the parameter The calculation expression is as follows

[0085] Formula (5);

[0086] Several parameters obtained by the above calculation expression Sort the values ​​and output the sorting results, and finally select the parameters The well with the smallest value is the optimal sewage reinjection well.

[0087] Furthermore, based on the same inventive concept, the embodiments of the present application also provide a gas field wastewater reinjection well selection device based on planar radial flow, as described in the following embodiments. As used below, the term "unit" or "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived. Specifically, refer to the attached manual. Figure 2 The device may include: a data acquisition module 201, a first data processing module 202, a second data processing module 203, a third data processing module 204, a fourth data processing module 205 and a result sorting and output module 206.

[0088] The structure is described in detail below.

[0089] The data acquisition module 201 is used to obtain the engineering implementation data of each planned sewage reinjection well;

[0090] The first data processing module 202 is used for selecting and screening the proposed reinjection wells;

[0091] The second data processing module 203 is used to calculate the current water production of the gas field, establish a relationship curve between the water injection rate and the water injection pressure based on the plane radial flow, and determine the bottom hole flow pressure corresponding to the injection rate of each alternative wastewater reinjection well when the injection rate is the current water production of the gas field;

[0092] The third data processing module 204 is used to determine the bottom hole flow pressure corresponding to each candidate wastewater reinjection well during the peak water production period of the gas field;

[0093] The fourth data processing module 205 is used to determine the sewage accommodating space of each candidate sewage reinjection well;

[0094] The result sorting and outputting module 206 is used to preferentially sort the candidate sewage reinjection wells and output the results.

[0095] It should be noted that the systems, devices, models, or units described in the above embodiments can be implemented by computer chips or physical devices, or by products with certain functions. For ease of description, in this specification, the above devices are described in various units according to their functions. Of course, when implementing this application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0096] Furthermore, in this specification, adjectives such as first and second may be used merely to distinguish one element or action from another, without necessarily or implying any actual such relationship or order.

[0097] From the above description, it can be seen that the embodiment of the present application provides a gas field wastewater reinjection well selection device based on plane radial flow. Through the plane radial flow formula, the parameters such as the injection volume and the bottom hole flow pressure are calculated, and finally the optimal wastewater reinjection well can be selected from several spare injection wells, which is conducive to ensuring the smooth implementation of wastewater reinjection after the well selection.

[0098] Furthermore, an embodiment of the present application also provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable in the processor. When the processor executes the computer program, the steps of any of the above methods are implemented.

[0099] Furthermore, an embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed in a computer processor, it implements the steps of any of the above methods.

[0100] Example 2

[0101] This embodiment takes the data of each well of the S gas field in Sichuan as an example to further explain the gas field wastewater injection well selection method based on plane radial flow in the present application.

[0102] The method of this application is used to select a pump injection gas well in a certain S gas field, including the following steps:

[0103] S101. Collect and obtain engineering implementation data for 50 wells in the S gas field.

[0104] S102. Select G-23D, P-23, U-21, S-22, Y-21, Sa-21, WO-21, and EO-21 as proposed water injection wells, which have low pressure, no wellhead production, intact casing, and no surrounding environmental risks.

[0105] S103, calculate the current water production of S gas field. The current daily water production of S gas field is 213 According to the plane radial flow formula, combined with the engineering implementation data collected in the early stage, calculate the corresponding bottom hole flow pressure after all the above daily water production is injected into the formation under the current conditions, and refer to the attached manual. Figure 3 .

[0106] S104. Use numerical simulation to predict the water production of the S gas field in the later period. According to the plane radial flow formula combined with the numerical simulation results, calculate the bottom hole pressure of each well predicted each year. Figure 4 The highest water production will be in 2024, when the water production is expected to be 735 , the bottom hole pressure of each well during water injection is as follows Figure 5 shown.

[0107] S105. According to numerical simulation and well logging data, the cumulative water production of the S gas field is 4.5802 million cubic meters. According to the principle of material balance, the space available for sewage in each well is calculated. The calculation results are shown in the appendix of the manual. Figure 6 , removing the Y-21 and Sa-21 wells whose capacity is less than the water production of the gas field.

[0108] S106. After removing the wells whose accommodating space is smaller than the water production of the gas field, comprehensively consider and select the well with the smallest difference between the current bottom flow pressure of the reinjection well and the bottom flow pressure during the peak injection period. Then calculate the parameter D according to the following formula. After calculation, refer to the attached manual. Figure 7 , G-23D well has the smallest D value, so it is selected as the most preferred sewage reinjection well

[0109] Formula (5).

[0110] The numerical simulations described in this application are all conventional technical means known and commonly used by those skilled in the art in oil and gas field development.

[0111] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as limiting the scope of protection of this application.

[0112] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0113] The devices or modules illustrated in the above embodiments can be specifically implemented by computer chips or entities, or by products with certain functions. For the convenience of description, the above devices are described in terms of functions and are divided into various modules and described separately. Of course, when implementing this application, the functions of each module can be implemented in the same or multiple software and / or hardware, or the module that implements the same function can be implemented by a combination of multiple sub-modules, etc. The device embodiments described above are merely schematic. For example, the division of the modules is only a logical function division. In actual implementation, there may be other division methods, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0114] Those skilled in the art will also appreciate that, in addition to implementing the controller in pure computer-readable program code, it is entirely possible to implement the same functionality by logically programming the method steps in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, embedded microcontrollers, and the like. Therefore, such a controller can be considered a hardware component, and the devices included therein for implementing various functions can also be considered structures within the hardware component. Alternatively, the devices for implementing various functions can be considered both software modules implementing the method and structures within the hardware component.

[0115] The above description is merely a preferred embodiment of the present application and does not constitute any form of limitation to the present application. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present application shall fall within the scope of protection of the present application.

Claims

1. A method for selecting gas field wastewater reinjection wells based on plane radial flow, characterized in that: include: Obtain engineering implementation data for each planned sewage reinjection well; Optimal selection and investigation of planned reinjection wells; Calculate the current gas field water production, establish a relationship curve between injection volume and injection pressure based on plane radial flow, and determine the bottom hole flow pressure corresponding to the injection volume of each alternative wastewater reinjection well when the injection volume is the current gas field water production; Determine the bottom hole flow pressure corresponding to each alternative wastewater reinjection well during the peak water production period of the gas field; Determine the sewage accommodating space of each alternative sewage reinjection well; Optimal ranking of alternative sewage reinjection wells; The preferred sorting of the candidate sewage reinjection wells includes: Eliminate the alternative sewage reinjection wells whose sewage accommodating space is less than the cumulative water production; Comprehensive consideration to select the current bottom hole pressure of the reinjection well The pressure difference between the bottom hole flow pressure during the peak period of water injection and the bottom hole flow pressure of the current reinjection well the smallest well; Set parameters , and finally select the parameters The smallest well is the optimal sewage reinjection well.

2. A method for selecting a gas field wastewater reinjection well based on plane radial flow according to claim 1, characterized in that: The engineering implementation data include well logging data, mud logging data, drilling data, drilling core data, production pressure data of the gas field where the sewage reinjection well is located, and gas field water production data.

3. The method for selecting a gas field wastewater reinjection well based on planar radial flow according to claim 1, characterized in that: The preferred investigation of the proposed sewage reinjection wells includes: Taking into account the available reinjection layers of the gas field, and on the premise of meeting the environmental protection requirements of the gas field, all wells that may implement wastewater reinjection are checked and organized as alternative wastewater reinjection wells.

4. The method for selecting a gas field wastewater reinjection well based on planar radial flow according to claim 1, characterized in that: The determining of the bottom hole flow pressure corresponding to the injection amount of each candidate wastewater reinjection well being equal to the current gas field water production amount includes: Assume that the current water production of the gas field is According to the plane radial flow formula, we have Formula (2); in, The water production of the gas field is The bottom flow pressure of the sewage reinjection well is is the viscosity of the reinjected wastewater, is the wellbore radius, is the sweep radius of the reinjection well, is the permeability of the reinjection well reservoir to the injected wastewater, is the reservoir thickness of the reinjection well, is the formation pressure.

5. The method for selecting a gas field wastewater reinjection well based on plane radial flow according to claim 1, characterized in that: The determination of the formation pressure corresponding to each candidate wastewater reinjection well during the peak water production period of the gas field includes: Through numerical simulation, it is found that the peak water production of the gas field occurs in the The peak water production in that year was , the calculation expression of plane radial flow is Formula (3); in, is the bottom hole flow pressure corresponding to the wastewater reinjection well during the peak period of gas field water production, is the viscosity of the reinjected wastewater, is the wellbore radius, is the sweep radius of the reinjection well, is the permeability of the reinjection well reservoir to the injected wastewater, is the reservoir thickness of the reinjection well, is the formation pressure in that year.

6. A method for selecting a gas field wastewater reinjection well based on planar radial flow according to claim 1, characterized in that: Determining the sewage accommodating space of each candidate sewage reinjection well includes: The cumulative water production of the gas field is simulated by numerical simulation method, and according to the principle of material balance, Formula (4); in, is the volume of underground available space, is the underground space volume occupied by the produced gas, For produced groundwater, is the surface volume of produced gas, is the gas compressibility coefficient.

7. A gas field wastewater reinjection well selection device based on plane radial flow, characterized in that: The gas field wastewater reinjection well selection device based on plane radial flow is used to implement the gas field wastewater reinjection well selection method based on plane radial flow according to any one of claims 1 to 6, comprising: A data acquisition module is used to obtain engineering implementation data of each planned sewage reinjection well; The first data processing module is used for selecting and troubleshooting the proposed reinjection wells; The second data processing module is used to calculate the current water production of the gas field, establish a relationship curve between the water injection rate and the water injection pressure based on the plane radial flow, and determine the bottom hole flow pressure corresponding to the injection rate of each alternative wastewater reinjection well when the injection rate is the current water production of the gas field; The third data processing module is used to determine the bottom hole flow pressure corresponding to each alternative wastewater injection well during the peak water production period of the gas field; A fourth data processing module is used to determine the sewage accommodating space of each candidate sewage reinjection well; The result sorting and output module is used to prioritize the candidate sewage reinjection wells and output the results.

8. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable in the processor, wherein: When the processor executes the computer program, the method according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed in a computer processor, the method according to any one of claims 1 to 6 is implemented.

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