Method for arranging geothermal well groups of cross-seasonal underground heat storage system

Abstract

The invention provides a geothermal well group arrangement method for a cross-seasonal underground heat storage system, and belongs to the technical field of underground heat storage. The method comprises the following steps: acquiring geophysical exploration data of a thermal reservoir area of a research plot; the geophysical exploration data are analyzed, initial arrangement point positions of cold well clusters and hot well clusters are determined, the cold well clusters are arranged in an inner circle area of a first concentric circle, the hot well clusters are arranged in an outer circle area of the first concentric circle, the inner circle area comprises an inner circle boundary, and the outer circle area comprises an outer circle boundary; determining a hot and cold well thermal breakthrough distance and setting a distance between an inner circle and an outer circle of a first concentric circle; and performing energy storage evaluation on the underground heat storage system corresponding to the initial arrangement point location, and if an evaluation result does not meet a preset requirement, iteratively changing the arrangement point locations of the cold well and the hot well cluster until the evaluation result meets the preset requirement. According to the method, the arrangement of the geothermal well group of the large-scale cross-season underground heat storage system, which saves the system construction cost and effectively prevents the heat breakthrough phenomenon, is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of underground heat storage, and specifically relates to a method for arranging geothermal well groups in a cross-seasonal underground heat storage system, a device for arranging geothermal well groups in a cross-seasonal underground heat storage system, and a machine-readable storage medium. Background Art

[0002] At present, the northern region uses cogeneration units and back pressure units for heating. The back pressure unit is activated in the heating season for 4 months and is deactivated in the non-heating season for up to 8 months, which results in a certain waste of resources. The cogeneration unit dissipates a large amount of heat energy in the non-heating season. In addition, some areas in the north also face a certain heating gap in the heating season. Through the large-scale cross-seasonal underground heat storage system coupled with cogeneration or back pressure units to achieve cross-seasonal heating, heat can be stored in suitable underground reservoirs in the non-heating season, and heat can be taken in the heating season to achieve heating. This can well solve the problem of people's livelihood security caused by the shortage of heating area, and there are significant economic benefits, with broad prospects for promotion and application.

[0003] However, there is still a lack of large-scale inter-seasonal underground heat storage systems. Large-scale inter-seasonal underground heat storage systems require large construction areas and high land acquisition costs. Therefore, how to reasonably arrange cold well clusters and hot well clusters to prevent thermal breakthrough and minimize investment costs is a technical difficulty that needs to be overcome. Summary of the invention

[0004] In view of this, the purpose of the embodiments of the present invention is to provide a method for arranging geothermal well groups in a cross-seasonal underground heat storage system, a device for arranging geothermal well groups in a cross-seasonal underground heat storage system, and a machine-readable storage medium, so as to overcome the technical problem in the prior art that there is a lack of effective cold and hot well cluster arrangement methods, which leads to the inability to establish a low-cost, large-scale cross-seasonal underground heat storage system that effectively prevents thermal breakthrough.

[0005] In order to achieve the above-mentioned object, a first aspect of an embodiment of the present invention provides a method for arranging a geothermal well group in a cross-seasonal underground heat storage system, the method comprising: Obtain geophysical exploration data of the thermal reservoir area of ​​the study plot; Analyze the geophysical exploration data to determine the initial layout points of the cold well cluster and the hot well cluster. At the layout points, the cold well cluster is arranged in the inner circle area of ​​the first concentric circle, and the hot well cluster is arranged in the outer circle area of ​​the first concentric circle. The inner circle area includes the inner circle boundary, and the outer circle area includes the outer circle boundary. Determine the thermal breakthrough distances of the cold well and the hot well, and set the distance between the inner circle and the outer circle of the first concentric circle according to the thermal breakthrough distances; An energy storage evaluation is performed on the underground heat storage system obtained by arranging the cold well cluster and the hot well cluster at the initial layout points. If the evaluation results do not meet the preset requirements, the layout points of the cold well cluster and the hot well cluster are iteratively changed until the evaluation results meet the preset requirements, and the cold well cluster and the hot well cluster are arranged at the layout points corresponding to the evaluation results that meet the preset requirements.

[0006] Optionally, the cold well is arranged on each concentric ring in the inner circle area of ​​the first concentric circle, or the cold well is arranged on each concentric ring in the inner circle area of ​​the first concentric circle and at the center of the inner circle of the first concentric circle; The center of each concentric ring is the same as the center of the first concentric circle.

[0007] Optionally, the hot wells are arranged on concentric rings in the outer area of ​​the outer circle of the first concentric circle, and the center of each concentric ring is the same as the center of the first concentric circle.

[0008] Optionally, the cold wells are distributed at equal intervals on each concentric ring.

[0009] Optionally, the heat wells are distributed at equal intervals on each concentric ring.

[0010] Optionally, the method further includes: Analyze the heat reservoir related data of the research block that has been explored and / or collected, determine the heat reservoir area of ​​the research block, so as to carry out geophysical exploration of the heat reservoir area and generate geophysical exploration data; The heat storage related data include geothermal geological data, hydrogeological data and geographical geological data.

[0011] Optionally, determine the thermal breakthrough distances for cold and hot wells, including: Establishing a multi-field coupled numerical model of underground heat storage in the heat reservoir region; The underground heat storage multi-field coupling numerical model is used to simulate different extraction and irrigation conditions to determine the heat breakthrough distance.

[0012] Optionally, the energy storage evaluation of the underground heat storage system obtained by arranging the cold well cluster and the hot well cluster at the initial arrangement points includes: By utilizing the influence of the original groundwater flow velocity in the aquifer in the thermal reservoir area on the underground thermal storage energy storage, an aquifer underground thermal storage energy storage evaluation system was constructed, and the evaluation results of the underground thermal storage system obtained by arranging cold well clusters and hot well clusters at the initial layout points were formed.

[0013] Optionally, the influence of the original groundwater flow velocity in the aquifer in the thermal reservoir area on the underground thermal storage energy storage is used to construct an aquifer underground thermal storage energy storage evaluation system, and form an evaluation result of the underground thermal storage system obtained by arranging the cold well cluster and the hot well cluster at the initial arrangement point, including: Determine the influencing factors by using the original groundwater flow velocity in the aquifer in the thermal reservoir area to determine the impact factor on the underground thermal storage energy storage; Constructing an underground thermal energy storage evaluation system for aquifers based on the influencing factors; The cold well cluster and hot well cluster are arranged at the initial layout points, and the multi-field coupling model of underground heat storage is used to study the influence of the original groundwater flow on the temperature field and the migration of the hydrodynamic field. According to the influence state, the influence factor value under the layout point layout is determined; The values ​​of the influencing factors are substituted into the aquifer underground heat storage energy storage evaluation system to form an evaluation result of the underground heat storage system obtained by arranging the cold well cluster and the hot well cluster at the initial layout points.

[0014] A second aspect of an embodiment of the present invention provides a device for arranging geothermal wells in a cross-seasonal underground heat storage system, the device comprising: The first acquisition module is used to acquire geophysical exploration data of the thermal reservoir area of ​​the research plot; The first determination module is used to analyze the geophysical exploration data to determine the initial layout points of the cold well cluster and the hot well cluster. At the layout points, the cold well cluster is arranged in the inner circle area of ​​the first concentric circle, and the hot well cluster is arranged in the outer circle area of ​​the first concentric circle. The inner circle area includes the inner circle boundary, and the outer circle area includes the outer circle boundary. A second determination module is used to determine the thermal breakthrough distance of the cold well and the hot well, and to set the distance between the inner circle and the outer circle of the first concentric circle according to the thermal breakthrough distance; The third determination module is used to perform energy storage evaluation on the underground heat storage system obtained by arranging the cold well cluster and the hot well cluster at the initial layout points. If the evaluation result does not meet the preset requirements, the layout points of the cold well cluster and the hot well cluster are iteratively changed until the evaluation result meets the preset requirements, so as to arrange the cold well cluster and the hot well cluster at the layout points corresponding to the evaluation result that meets the preset requirements.

[0015] A third aspect of an embodiment of the present invention provides a machine-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for arranging a geothermal well group in a cross-seasonal underground heat storage system as described in the first aspect of an embodiment of the present invention.

[0016] In the above technical scheme, the initial layout points of the cold and hot well clusters are first determined by analyzing the geophysical exploration data obtained by wide-area electromagnetic method, and the layout strategy of "inner and outer concentric circle regional layout" is set, that is, the cold well cluster is arranged in the inner circle area of ​​the first concentric circle (including the boundary of the inner circle), and the hot well cluster is arranged in the outer circle area of ​​the first concentric circle (including the boundary of the outer circle). The spacing between the inner circle and the outer circle of the first concentric circle is determined by using methods such as numerical simulation to obtain the thermal breakthrough distance. Because the energy storage of the underground heat storage system obtained by different layout points is different, it is necessary to evaluate the performance of the underground heat storage system after the layout of different layout points to obtain the optimal layout point, thereby realizing the layout of the geothermal well group of the large-scale cross-season underground heat storage system.

[0017] Compared with the small-scale inter-seasonal underground heat storage system, the large-scale inter-seasonal underground heat storage system has more hot and cold wells and occupies a larger area. If the hot and cold well layout method of the small-scale inter-seasonal underground heat storage system is still used to layout the hot and cold wells, it will inevitably lead to the defect of high cost. Therefore, the layout method implemented by the above technical solution is an optimized layout method, and the optimization content is mainly reflected in the following two aspects: 1) The thermal breakthrough distance is determined by methods such as numerical simulation, so that the spacing between the set inner and outer concentric circles effectively prevents thermal breakthrough; 2) It can be seen that due to the influence of groundwater pressure during the extraction and injection process, in order to ensure the amount of groundwater recharge, the hot wells and cold wells need to meet constraints such as spacing constraints between hot wells, spacing constraints between cold wells, and spacing constraints between hot and cold wells when they are laid out. Compared with the traditional underground heat storage system that arranges cold wells or hot wells horizontally or vertically, the layout strategy of "regional layout of inner and outer concentric circles" effectively reduces the footprint of the underground heat storage system, thereby reducing the construction cost of the underground heat storage system.

[0018] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1 A flowchart of a method for arranging a geothermal well group in a cross-season underground heat storage system according to an embodiment of the present invention is schematically shown; Figure 2 The schematic diagram of the “inner and outer concentric circle regional arrangement” in a specific application example is schematically shown. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] Embodiment 1 The geothermal well group arrangement method for a cross-seasonal underground heat storage system provided by the embodiment of the present invention can be applied to the arrangement of geothermal well groups in a large-scale cross-seasonal underground heat storage system. The above description does not limit the application scenario of the geothermal well group arrangement method for a cross-seasonal underground heat storage system implemented by the embodiment of the present invention.

[0024] See also Figure 1 The method for arranging geothermal well groups in a cross-season underground heat storage system provided by an embodiment of the present invention includes the following implementation steps: Step S102, obtaining geophysical exploration data of the thermal reservoir area of ​​the study plot.

[0025] For example, geophysical prospecting data may be data obtained after geophysical prospecting by wide-area electromagnetic method. It is known that before arranging hot and cold wells, the thermal reservoir area of ​​the study block must be determined first. To determine the thermal reservoir area, it is usually necessary to survey and / or collect geothermal geological parameters, hydrogeological parameters, and geographic geological parameters, and analyze the surveyed and / or collected data. In a specific embodiment, before obtaining geophysical prospecting data of the thermal reservoir area of ​​the study plot, the following steps are also included: Step S100, analyzing the heat reservoir related data of the research block that has been explored and / or collected, and determining the heat reservoir area of ​​the research block, so as to generate geophysical exploration data after conducting geophysical exploration of the heat reservoir area. The heat reservoir related data includes geothermal geological data, hydrogeological data, and geographic geological data.

[0026] Step S104, after analyzing the geophysical exploration data, determine the initial layout points of the cold well cluster and the hot well cluster. At the layout points, the cold well cluster is arranged in the inner circle area of ​​the first concentric circle, and the hot well cluster is arranged in the outer circle area of ​​the first concentric circle. The inner circle area includes the inner circle boundary, and the outer circle area includes the outer circle boundary.

[0027] It is known that the geophysical exploration data obtained by using methods such as wide-area electromagnetic method can reflect the resistivity of the strata in the thermal reservoir area, etc. Before the cold well clusters and hot well clusters are laid out, geological design and construction technology design must be carried out. The geological design based on parameters such as the resistivity of the strata in the thermal reservoir area can clarify the appropriate locations for the distribution of the cold well and hot well sections. The construction technology design based on parameters such as the resistivity of the strata in the thermal reservoir area can clarify the wellbore structure of the cold well and hot well. Therefore, after analyzing the geophysical exploration data, the initial layout points of the cold well clusters and hot well clusters can be determined.

[0028] Step S106, determining the thermal breakthrough distances of the cold well and the hot well, and setting the distance between the first concentric inner circle and the first concentric outer circle according to the thermal breakthrough distances.

[0029] It should be understood that in underground heat storage such as geothermal energy storage or coupled cogeneration units, in order to prevent the tail water re-injected into the cold well from causing the temperature of the hot well to drop, the thermal breakthrough distance needs to be calculated. Commonly used calculation methods include theoretical formula calculation and numerical simulation methods.

[0030] Exemplarily, in a specific embodiment, determining the thermal breakthrough distance of the cold well and the hot well includes the following implementation steps: Establish a multi-field coupled numerical model of underground heat storage in the heat reservoir area; The multi-field coupled numerical model of underground heat storage is used to simulate different extraction and irrigation conditions to determine the heat breakthrough distance.

[0031] Specifically, the multi-field coupling numerical model of underground heat storage can be constructed based on the FEFLOW model. In the underground heat storage system, multi-field coupling refers to the coupling of flow field, pressure field, chemical field and temperature field.

[0032] Step S108, performing energy storage evaluation on the underground heat storage system obtained by arranging the cold well cluster and the hot well cluster at the initial arrangement points. If the evaluation result does not meet the preset requirements, the arrangement points of the cold well cluster and the hot well cluster are iteratively changed until the evaluation result meets the preset requirements, so as to arrange the cold well cluster and the hot well cluster at the arrangement points corresponding to the evaluation result that meets the preset requirements.

[0033] Exemplarily, an energy storage evaluation is performed on an underground heat storage system obtained by arranging a cold well cluster and a hot well cluster at initial arrangement points, including the following implementation steps: By utilizing the influence of the original groundwater flow velocity in the aquifer in the thermal reservoir area on the underground thermal storage energy storage, an aquifer underground thermal storage energy storage evaluation system was constructed, and the evaluation results of the underground thermal storage system obtained by arranging cold well clusters and hot well clusters at the initial layout points were formed.

[0034] After constructing the underground heat storage multi-field coupling numerical model, in a specific embodiment, the underground heat storage multi-field coupling numerical model can be combined to perform energy storage evaluation. Accordingly, the influence of the original groundwater flow velocity in the aquifer in the heat reservoir area on the underground heat storage energy is used to construct an aquifer underground heat storage energy storage evaluation system, and form an evaluation result of the underground heat storage system obtained by arranging the cold well cluster and the hot well cluster at the initial arrangement point, including the following implementation steps: Determine the influencing factors by using the original groundwater flow velocity in the aquifer in the thermal reservoir area to determine the impact factor on the underground thermal storage energy storage; Construct an evaluation system for underground thermal energy storage in aquifers based on influencing factors; The cold well cluster and hot well cluster are arranged at the initial layout points, and the multi-field coupling model of underground heat storage is used to study the influence of the original groundwater flow on the temperature field and the migration of the hydrodynamic field. According to the influence state, the influence factor value under the layout point layout is determined; The values ​​of the influencing factors are substituted into the aquifer underground heat storage energy storage evaluation system to form an evaluation result of the underground heat storage system obtained by arranging the cold well cluster and the hot well cluster at the initial layout points.

[0035] As in the above embodiment, it should be understood that when the cold well clusters and the hot well clusters are arranged at the initial arrangement points, the goal is to arrange all the cold wells of a preset number of cold wells in the inner circle area of ​​the first concentric circle (including the inner circle boundary), determine the radius of the inner circle area, calculate the radius of the outer circle area based on the radius of the inner circle area, and then arrange the hot well cluster in the outer area of ​​the outer circle (including the outer circle boundary).

[0036] Because there are often original groundwater flows in aquifers, these original groundwater flows have the effect of promoting and inhibiting the migration of temperature field and hydrodynamic field in the energy storage area. Therefore, when evaluating the underground thermal energy storage in aquifers, it is necessary to consider the distribution of these original groundwater flows to form a complete evaluation system for underground thermal energy storage in aquifers. In order to evaluate the thermal performance of underground thermal energy storage systems based on aquifer energy storage, the following three analysis methods can be used for evaluation, thereby forming an evaluation system for underground thermal energy storage in aquifers.

[0037] The first analysis method is the Rayleigh Number analysis method. The Rayleigh Number analysis method is a dimensionless number that measures whether the heat transfer form is mainly heat conduction or convection heat transfer based on the critical value. The equation can be expressed by the following formula: (Formula 1); In the above formula, α is the thermal expansion coefficient of water, ρ represents the density of water, g is the gravitational acceleration of water, h represents the thickness of the aquifer, c aq is the volumetric heat capacity of the aquifer, k aq represents the permeability coefficient of the aquifer, △T Indicates the temperature difference between the injected water and the environment, μ represents the hydrodynamic viscosity, λ aq represents the thermal conductivity of the aquifer. Existing studies have shown that when Ra The critical value Ra ε ≥4π 2 When Ra<Ra ε , heat transfer is mainly through heat conduction, and vice versa through natural convection; Ra Increases, and the heat recovery efficiency is increased by natural convection.

[0038] The second analysis method is the thermal interference analysis method. The water storage in the aquifer is usually approximated as a cylinder. The height of the cylinder is equal to the thickness of the aquifer. The thermal interference radius increases with the amount of water injected into the aquifer. Assuming that there is an instantaneous thermal equilibrium between the groundwater and the aquifer sediment, the thermal interference radius can be expressed by the following formula: (Formula 2); In the above formula, c w is the volumetric heat capacity of water; R h is the hydraulic radius; nis the porosity. From formula 2, we can see that when c w , c aq and n When is a constant, the thermal interference radius is linearly related to the hydraulic radius because heat transfer occurs in all directions, while water only flows radially from the well.

[0039] The third analysis method is the heat recovery efficiency analysis method. It refers to the ratio of energy extracted from the aquifer to the energy injected into it, using the reference temperature when the aquifer is undisturbed, and can be expressed as follows: (Formula 3); In the above formula, q v ext and q v inj denote the volume flow rates of extracted and injected water, respectively; T 0 represents the initial temperature of the aquifer; T ext and T inj Represent the extraction and injection water temperatures respectively; t ext start and t ext end Respectively represent the start and end time of water extraction; t inj start and t inj end Respectively represent the start and end time of water injection.

[0040] In addition, the relationship between heat recovery efficiency, thermal interference radius, and groundwater flow rate satisfies: when the ratio of thermal interference radius to groundwater flow rate is small ( R th / μ ﹤2), the heat loss is large and the heat recovery efficiency is low; when the ratio of the thermal interference radius to the groundwater velocity is large ( R th / μ ﹥4), heat conduction is dominant and the heat recovery efficiency is basically stable; when the ratio of thermal interference radius and groundwater velocity meets 2< R th / μ When <4, heat loss and heat conduction interact with each other.

[0041] In another specific embodiment, the economic and environmental benefits also need to be considered in the evaluation of underground thermal energy storage, and indicators corresponding to the economic and environmental benefits are included in the underground thermal energy storage evaluation system.

[0042] For example, in a specific embodiment, the cold wells are arranged on each concentric ring in the inner circle area of ​​the first concentric circle, the center of each concentric ring is the same as the center of the first concentric circle, and the cold wells are distributed at equal intervals on each concentric ring.

[0043] Exemplarily, in a specific embodiment, the cold wells are arranged on each concentric ring in the inner circle area of ​​the first concentric circle and at the center of the first concentric circle, the center of each concentric ring is the same as the center of the first concentric circle, and the cold wells are equally spaced on each concentric ring.

[0044] For example, in a specific embodiment, the heat wells are arranged on each concentric ring in the outer area of ​​the first concentric circle, the center of each concentric ring is the same as the center of the first concentric circle, and the heat wells are evenly spaced on each concentric ring.

[0045] In the above three embodiments, by arranging the cold wells and the hot wells at equal intervals on the concentric rings, the radii of the inner circle and the outer circle of the first concentric circle are reduced, thereby reducing the footprint of the inter-seasonal underground heat storage system and saving the construction cost of the system.

[0046] Embodiment 2 See also Figure 2 , the embodiment of the present invention is the application of the above-mentioned embodiment one in a specific block. In this application, the inner and outer concentric circle regionalization arrangement is adopted: the cold wells are arranged on each concentric ring in the inner circle area of ​​the first concentric circle and at the center of the first concentric circle. The center of each concentric ring is the same as the center of the first concentric circle, and the cold wells are evenly spaced on each concentric ring; the hot wells are arranged on the outer circle boundary of the first concentric circle. In addition, the heat storage type of the large-scale cross-seasonal underground heat storage system is medium-deep underground aquifer sandstone heat storage, and it is coupled with a cogeneration unit and / or a back pressure unit to realize cross-season heating. In the non-heating season, heat is stored in the underground reservoir, and heat is extracted in the heating season to realize heating. Specifically, in the above-mentioned specific application, the arrangement method of the geothermal well group is as follows: Step A1, by collecting the geographical geological, hydrogeological, geothermal geological and other data and related results data obtained from previous geophysical exploration and drilling in the application block, and analyzing the collected data, the thermal reservoir area of ​​the application block is determined.

[0047] Step A2: Conduct geophysical exploration in the thermal reservoir area using wide-area electromagnetic method to determine the initial layout locations of the cold well cluster and the hot well cluster.

[0048] Step A3, based on the FEFLOW model, establish an underground heat storage multi-field coupling numerical model of the heat reservoir area, and use the established underground heat storage multi-field coupling numerical model to simulate different extraction and irrigation conditions to determine the heat breakthrough distance.

[0049] Specifically, a multi-field coupling numerical model of underground heat storage in the heat reservoir area is established based on the FEFLOW model. After the thermal recharge of the Guantao Formation aquifer in summer, the multi-field coupling dynamic response of the groundwater flow field, chemical field and temperature field in the heat reservoir is numerically simulated using the constructed multi-field coupling numerical model of underground heat storage. The thermodynamic parameters for extracting and utilizing the geothermal resources stored in the Guantao Formation in winter are simulated. Combined with sensitivity analysis, the thermal reservoir area of ​​the application block under different extraction and injection conditions is determined. The key factors that affect its seepage field and temperature field under different pumping-recharge conditions are simulated; the spatiotemporal evolution of the hydrodynamic field, water pressure field, hydrochemical field and water temperature field of the thermal reservoir under different pumping-recharge conditions are simulated; the high-temperature cooling water recharge process of the cogeneration unit and / or back-pressure unit and the response process of its heat storage are simulated, as well as the impact of geothermal resources exploitation for winter heating on the dynamic changes of multiple fields of the thermal reservoir; the underground heat storage multi-field coupling numerical model is used to evaluate the recoverable resources of the thermal reservoir under different well layout and exploitation schemes, providing a basis for the reasonable setting of the spacing between cold wells and hot wells.

[0050] Step A4, determining the spacing L between the inner circle and the outer circle of the first concentric circle according to the thermal breakthrough distance. It can be known that the spacing L is greater than the thermal breakthrough distance. For example, in this application example, the spacing L is greater than the thermal breakthrough distance and is set to 50m.

[0051] Step A5, according to the preset number of hot and cold wells, the cold well spacing, and the principle that each cold well is arranged on each concentric ring in the inner circle area of ​​the first concentric circle (including the inner circle boundary) and at the center of the first concentric circle, after the cold wells are arranged, the inner circle radius R1 of the first concentric circle is obtained. In this application example, the cold well spacing is 100m.

[0052] Step A6, calculate the outer radius of the first concentric circle as: R2=L+R1, and arrange the hot wells at equal intervals in the outer area of ​​the first concentric circle (including the outer circle boundary) according to the preset hot well spacing. In this application example, the hot wells are arranged at equal intervals on the outer circle boundary of the first concentric circle, and the hot well spacing is 100m.

[0053] Step A7, by using the underground heat storage multi-field coupling numerical model to perform numerical simulation and comparative analysis, study the effects of the original groundwater flow of the aquifer in the heat reservoir area on the promotion and inhibition of the migration of the temperature field and hydrodynamic field in the heat reservoir area, and adjust the layout points of the cold well cluster and the hot well cluster accordingly.

[0054] Specifically: utilizing the influence of the original groundwater flow in the aquifer in the thermal reservoir area on the thermal storage energy storage, construct an evaluation system for underground thermal storage energy storage in the aquifer; conducting a sensitivity analysis of the underground thermal storage multi-field coupling numerical model, firstly, the cold well cluster and the hot well cluster are arranged at the initial arrangement points, and the influence state of the original groundwater flow on the temperature field and the hydrodynamic field migration is studied by using the underground thermal storage multi-field coupling numerical model, and the influence factor value is determined according to the influence state, and the influence factor value is substituted into the evaluation system for underground thermal storage energy storage in the aquifer to form an evaluation result of the underground thermal storage system obtained by arranging the cold well cluster and the hot well cluster at the initial arrangement points, and then judging whether the obtained evaluation result meets the preset requirements, if so, the cold well cluster and the hot well cluster are arranged at the arrangement points corresponding to the evaluation result, otherwise, the arrangement points are iteratively changed until the evaluation result of the underground thermal storage system meets the preset requirements, and then the cold well cluster and the hot well cluster are arranged at the arrangement points corresponding to the evaluation result that meets the preset requirements. Among them, in this application example, when studying the influence of the original groundwater flow on the temperature field and the migration of the hydrodynamic field, the flow rate of the original groundwater flow in the aquifer with the highest energy storage temperature is used as the original groundwater flow rate in the thermal reservoir area. For example, the energy storage temperature difference of the aquifer with the highest energy storage temperature is 45°C, the original temperature of the Guantao Formation thermal reservoir is 45°C, and the reinjection temperature is 80~90°C.

[0055] Embodiment 3 An embodiment of the present invention provides a geothermal well group arrangement device for a cross-seasonal underground heat storage system, comprising: The first acquisition module is used to acquire geophysical exploration data of the thermal reservoir area of ​​the research plot; The first determination module is used to analyze the geophysical exploration data to determine the initial layout points of the cold well cluster and the hot well cluster. At the layout points, the cold well cluster is arranged in the inner circle area of ​​the first concentric circle, and the hot well cluster is arranged in the outer circle area of ​​the first concentric circle. The inner circle area includes the inner circle boundary, and the outer circle area includes the outer circle boundary. A second determination module is used to determine the thermal breakthrough distance of the cold well and the hot well, and to set the distance between the inner circle and the outer circle of the first concentric circle according to the thermal breakthrough distance; The third determination module is used to perform energy storage evaluation on the underground heat storage system obtained by arranging the cold well cluster and the hot well cluster at the initial layout points. If the evaluation result does not meet the preset requirements, the layout points of the cold well cluster and the hot well cluster are iteratively changed until the evaluation result meets the preset requirements, so as to arrange the cold well cluster and the hot well cluster at the layout points corresponding to the evaluation result that meets the preset requirements.

[0056] In a specific embodiment, the cold well is arranged on each concentric ring in the inner circle area of ​​the first concentric circle, or the cold well is arranged on each concentric ring in the inner circle area of ​​the first concentric circle and at the center of the inner circle of the first concentric circle; wherein the center of each concentric ring is the same as the center of the first concentric circle.

[0057] In a specific embodiment, the hot wells are arranged on concentric rings in the outer area of ​​the first concentric circle, and the center of each concentric ring is the same as the center of the first concentric circle.

[0058] In a specific embodiment, the cold wells are distributed at equal intervals on each concentric ring.

[0059] In a specific embodiment, the heat wells are evenly spaced on each concentric ring.

[0060] In a specific embodiment, the geothermal well group arrangement device of the cross-seasonal underground heat storage system also includes a first analysis module, which is used to analyze the heat storage related data of the research block that has been explored and / or collected, and determine the heat reservoir area of ​​the research block, so as to carry out geophysical exploration of the heat reservoir area and generate geophysical exploration data. The heat storage related data includes geothermal geological data, hydrogeological data and geographic geological data.

[0061] In a specific embodiment, determining the thermal breakthrough distances of the cold well and the hot well includes: Establish a multi-field coupled numerical model of underground heat storage in the heat reservoir area; The multi-field coupled numerical model of underground heat storage is used to simulate different extraction and irrigation conditions to determine the heat breakthrough distance.

[0062] In a specific embodiment, an energy storage evaluation is performed on an underground heat storage system obtained by arranging a cold well cluster and a hot well cluster at initial arrangement points, including: By utilizing the influence of the original groundwater flow velocity in the aquifer in the thermal reservoir area on the underground thermal storage energy storage, an aquifer underground thermal storage energy storage evaluation system was constructed, and the evaluation results of the underground thermal storage system obtained by arranging cold well clusters and hot well clusters at the initial layout points were formed.

[0063] In a specific embodiment, the influence of the original groundwater flow velocity in the aquifer in the thermal reservoir area on the underground thermal storage energy storage is used to construct an aquifer underground thermal storage energy storage evaluation system, and an evaluation result of the underground thermal storage system obtained by arranging the cold well cluster and the hot well cluster at the initial arrangement point is formed, including: Determine the influencing factors by using the original groundwater flow velocity in the aquifer in the thermal reservoir area to determine the impact factor on the underground thermal storage energy storage; Construct an evaluation system for underground thermal energy storage in aquifers based on influencing factors; The cold well cluster and hot well cluster are arranged at the initial layout points, and the multi-field coupling model of underground heat storage is used to study the influence of the original groundwater flow on the temperature field and the migration of the hydrodynamic field. According to the influence state, the influence factor value under the layout point layout is determined; The values ​​of the influencing factors are substituted into the aquifer underground heat storage energy storage evaluation system to form an evaluation result of the underground heat storage system obtained by arranging the cold well cluster and the hot well cluster at the initial layout points.

[0064] On the other hand, an embodiment of the present invention further provides a machine-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for arranging geothermal well groups in a cross-seasonal underground heat storage system as described in the above embodiment.

[0065] On the other hand, an embodiment of the present invention further provides a computer device, including a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the method for arranging a geothermal well group in a cross-seasonal underground heat storage system described in the above embodiment is implemented.

[0066] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0067] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0068] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0069] Finally, it should be noted that 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for arranging geothermal well groups in a cross-season underground heat storage system. It is characterized in that The method comprises: Obtain geophysical exploration data of the thermal reservoir area of ​​the study plot; Analyze the geophysical exploration data to determine the initial layout points of the cold well cluster and the hot well cluster. At the layout points, the cold well cluster is arranged in the inner circle area of ​​the first concentric circle, and the hot well cluster is arranged in the outer circle area of ​​the first concentric circle. The inner circle area includes the inner circle boundary, and the outer circle area includes the outer circle boundary. Determine the thermal breakthrough distances of the cold well and the hot well, and set the distance between the inner circle and the outer circle of the first concentric circle according to the thermal breakthrough distances; An energy storage evaluation is performed on the underground heat storage system obtained by arranging the cold well cluster and the hot well cluster at the initial layout points. If the evaluation results do not meet the preset requirements, the layout points of the cold well cluster and the hot well cluster are iteratively changed until the evaluation results meet the preset requirements, and the cold well cluster and the hot well cluster are arranged at the layout points corresponding to the evaluation results that meet the preset requirements.

2. The method for arranging geothermal well groups of a cross-season underground heat storage system according to claim 1, It is characterized in that The cold well is arranged on each concentric ring in the inner circle area of ​​the first concentric circle, or the cold well is arranged on each concentric ring in the inner circle area of ​​the first concentric circle and at the center of the inner circle of the first concentric circle; The center of each concentric ring is the same as the center of the first concentric circle.

3. The method for arranging geothermal well groups of a cross-season underground heat storage system according to claim 1, It is characterized in that The heat wells are arranged on concentric rings outside the outer area of ​​the first concentric circle, and the center of each concentric ring is the same as the center of the first concentric circle.

4. The method for arranging geothermal well groups in a cross-season underground heat storage system according to claim 2, It is characterized in that The cold wells are distributed at equal intervals on each concentric ring.

5. The method for arranging geothermal well groups of a cross-season underground heat storage system according to claim 3, It is characterized in that The heat wells are distributed at equal intervals on each concentric ring.

6. The method for arranging geothermal well groups of a cross-season underground heat storage system according to claim 1, It is characterized in that The method further comprises: Analyze the heat reservoir related data of the research block that has been explored and / or collected, determine the heat reservoir area of ​​the research block, so as to carry out geophysical exploration of the heat reservoir area and generate geophysical exploration data; The heat storage related data include geothermal geological data, hydrogeological data and geographical geological data.

7. The method for arranging geothermal well groups in a cross-season underground heat storage system according to claim 1, It is characterized in that Determine thermal breakthrough distances for cold and hot wells, including: Establishing a multi-field coupled numerical model of underground heat storage in the heat reservoir region; The underground heat storage multi-field coupling numerical model is used to simulate different extraction and irrigation conditions to determine the heat breakthrough distance.

8. The method for arranging geothermal well groups in a cross-season underground heat storage system according to claim 7, It is characterized in that The energy storage evaluation of the underground heat storage system obtained by arranging the cold well cluster and the hot well cluster at the initial arrangement points includes: By utilizing the influence of the original groundwater flow velocity in the aquifer in the thermal reservoir area on the underground thermal storage energy storage, an aquifer underground thermal storage energy storage evaluation system was constructed, and the evaluation results of the underground thermal storage system obtained by arranging cold well clusters and hot well clusters at the initial layout points were formed.

9. The method for arranging geothermal well groups in a cross-season underground heat storage system according to claim 8, It is characterized in that The influence of the original groundwater flow velocity in the aquifer in the thermal reservoir area on the underground thermal storage energy storage is used to construct an aquifer underground thermal storage energy storage evaluation system, and an evaluation result of the underground thermal storage system obtained by arranging the cold well cluster and the hot well cluster at the initial arrangement point is formed, including: Determine the influencing factors by using the original groundwater flow velocity in the aquifer in the thermal reservoir area to determine the impact factor on the underground thermal storage energy storage; Constructing an underground thermal energy storage evaluation system for aquifers based on the influencing factors; The cold well cluster and hot well cluster are arranged at the initial layout points, and the multi-field coupling model of underground heat storage is used to study the influence of the original groundwater flow on the temperature field and the migration of the hydrodynamic field. According to the influence state, the influence factor value under the layout point layout is determined; The values ​​of the influencing factors are substituted into the aquifer underground heat storage energy storage evaluation system to form an evaluation result of the underground heat storage system obtained by arranging the cold well cluster and the hot well cluster at the initial layout points.

10. A geothermal well group arrangement device for a cross-season underground heat storage system. It is characterized in that The device comprises: The first acquisition module is used to acquire geophysical exploration data of the thermal reservoir area of ​​the research plot; The first determination module is used to analyze the geophysical exploration data to determine the initial layout points of the cold well cluster and the hot well cluster. At the layout points, the cold well cluster is arranged in the inner circle area of ​​the first concentric circle, and the hot well cluster is arranged in the outer circle area of ​​the first concentric circle. The inner circle area includes the inner circle boundary, and the outer circle area includes the outer circle boundary. A second determination module is used to determine the thermal breakthrough distance of the cold well and the hot well, and to set the distance between the inner circle and the outer circle of the first concentric circle according to the thermal breakthrough distance; The third determination module is used to perform energy storage evaluation on the underground heat storage system obtained by arranging the cold well cluster and the hot well cluster at the initial layout points. If the evaluation result does not meet the preset requirements, the layout points of the cold well cluster and the hot well cluster are iteratively changed until the evaluation result meets the preset requirements, so as to arrange the cold well cluster and the hot well cluster at the layout points corresponding to the evaluation result that meets the preset requirements.

11. A machine-readable storage medium having a computer program stored thereon, It is characterized in that When the computer program is executed by a processor, the method for arranging geothermal well groups in a cross-seasonal underground heat storage system according to any one of claims 1 to 9 is implemented.

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