Geothermal tail water recharge capacity detection method and device, electronic equipment and medium

Abstract

The invention discloses a geothermal tail water recharge capacity detection method and device, electronic equipment and a medium. The method comprises the steps that geothermal tail water energy at a geothermal tail water recharge permeation point under the target geothermal tail water recharge amount is determined; determining the sandstone thermal reservoir energy at the geothermal tail water recharge permeation point under the target geothermal tail water recharge amount; according to the geothermal tail water energy and the sandstone heat reservoir energy, whether the sandstone heat reservoir has the recharge capacity for geothermal tail water or not under the target geothermal tail water recharge amount is determined; and when the sandstone thermal reservoir has the recharge capacity on the geothermal tail water, determining the wellhead pressure of the recharge well required by recharge of the geothermal tail water. According to the method, the defects of a geothermal tail water recharge wellhead pressure and seepage resistance analysis method based on fluid mechanics are overcome, and effective support is provided for a geothermal tail water recharge technical scheme.

Description

Technical Field

[0001] The present invention relates to the technical field of geothermal tail water reinjection engineering, and in particular to a geothermal tail water reinjection capacity detection method, device, electronic equipment and medium. Background Art

[0002] In the design of geothermal heating project construction scheme, the analysis of geothermal tail water reinjection capacity is usually based on the principles of fluid mechanics, and the analysis of geothermal tail water reinjection capacity is carried out through the wellhead pressure of the reinjection well, seepage resistance, porosity and permeability of the reinjection sandstone thermal reservoir during the geothermal tail water reinjection process.

[0003] The reinjection of geothermal tail water is affected by factors such as the wellhead pressure of the reinjection well, water sensitivity, gas sensitivity, heat sensitivity, velocity sensitivity, and seepage resistance. The analysis of the reinjection capacity of geothermal tail water is very complicated. During the reinjection process of geothermal tail water, the pressure loss from the geothermal tail water reinjection well to the influence radius of geothermal tail water reinjection is difficult to calculate, which makes it difficult to scientifically calculate the reinjection capacity of geothermal tail water reinjection in the design of the engineering construction plan of geothermal heating projects. Simply using the wellhead pressure of geothermal tail water reinjection and the hot water head of the sandstone thermal reservoir to calculate the reinjection capacity of geothermal tail water is difficult to achieve the expected effect in actual production operation. With the increase of geothermal tail water reinjection volume, the difficulty of geothermal tail water reinjection continues to increase, and in the late heating season, the geothermal tail water often cannot be reinjected. Summary of the invention

[0004] The present invention provides a method, device, electronic equipment and medium for detecting geothermal tail water reinjection capacity, so as to solve the problem that the geothermal tail water reinjection capacity is difficult to measure.

[0005] According to one aspect of the present invention, a method for detecting geothermal tail water reinjection capacity is provided, comprising:

[0006] Determine the geothermal tail water energy at the geothermal tail water reinjection penetration point under the target geothermal tail water reinjection volume;

[0007] Determine the sandstone thermal reservoir energy at the geothermal tailwater reinjection penetration point at the target geothermal tailwater reinjection volume;

[0008] According to the geothermal tail water energy and the sandstone thermal reservoir energy, determine whether the sandstone thermal reservoir has the ability to recharge the geothermal tail water under the target geothermal tail water recharge volume;

[0009] When the sandstone thermal reservoir has the ability to reinject geothermal tail water, determine the wellhead pressure of the reinjection well required for geothermal tail water reinjection.

[0010] According to another aspect of the present invention, a device for detecting geothermal tail water reinjection capacity is provided, comprising:

[0011] A geothermal tail water energy determination module, used to determine the geothermal tail water energy at the geothermal tail water reinjection penetration point under the target geothermal tail water reinjection amount;

[0012] A sandstone thermal reservoir energy determination module is used to determine the sandstone thermal reservoir energy at the geothermal tail water reinjection penetration point under the target geothermal tail water reinjection amount;

[0013] A reinjection capacity determination module is used to determine whether the sandstone thermal reservoir has the reinjection capacity for geothermal tail water at the target geothermal tail water reinjection amount according to the geothermal tail water energy and the sandstone thermal reservoir energy;

[0014] The module for determining the wellhead pressure of the reinjection well is used to determine the wellhead pressure of the reinjection well required for reinjection of geothermal tail water when the sandstone thermal reservoir has the ability to reinject geothermal tail water.

[0015] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0016] at least one processor; and

[0017] a memory communicatively connected to the at least one processor; wherein,

[0018] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the geothermal tail water reinjection capacity detection method described in any embodiment of the present invention.

[0019] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to implement the geothermal tail water reinjection capacity detection method described in any embodiment of the present invention when executed by a processor.

[0020] The technical solution of the embodiment of the present invention determines the geothermal tail water energy E at the geothermal tail water reinjection penetration point according to the potential energy, kinetic energy and thermal energy of the geothermal tail water at the penetration point at the geothermal tail water reinjection influence radius. G Under the same conditions, the energy E of the sandstone thermal reservoir at the geothermal tailwater reinjection penetration point is determined according to the potential energy and thermal energy of the sandstone thermal reservoir. D , taking into account the influence of the thermal energy of geothermal tail water and the thermal energy of sandstone thermal reservoir on geothermal tail water reinjection, it is beneficial to improve the accuracy of judging the reinjection capacity of geothermal tail water; judging the reinjection capacity of geothermal tail water in sandstone thermal reservoir based on the calculation results, and calculating the wellhead pressure P of geothermal tail water reinjection well on the basis that the geothermal tail water in sandstone thermal reservoir has reinjection capacity HG, the wellhead pressure of the geothermal tail water reinjection well is controlled, and the method provides a basis for optimizing the design of the geothermal tail water reinjection engineering scheme of the geothermal heating project and the control of the geothermal tail water reinjection pressure during the production and operation process. The present invention avoids the shortcomings of the geothermal tail water reinjection wellhead pressure and seepage resistance analysis method based on fluid mechanics, and provides effective support for the geothermal tail water reinjection technical solution.

[0021] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A flow chart of a method for detecting geothermal tail water reinjection capacity provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the structure of a geothermal tail water reinjection capacity detection device provided by an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the structure of an electronic device for implementing the geothermal tail water reinjection capacity detection method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] Figure 1 A flow chart of a method for detecting the ability of geothermal tail water to be reinjected is provided for an embodiment of the present invention. This embodiment can be applied to determining whether a geothermal tail water reinjection penetration point has reinjection ability and calculating the wellhead pressure of the reinjection well when reinjection ability is present. The method can be performed by a geothermal tail water reinjection ability detection device, which can be implemented in the form of hardware and / or software, and can be configured in any electronic device with network communication function. Figure 1 As shown, the method includes:

[0029] S110. Determine the geothermal tail water energy at the geothermal tail water reinjection penetration point at the target geothermal tail water reinjection volume.

[0030] The target geothermal tail water reinjection volume may be a pre-set flow rate required for geothermal tail water reinjection.

[0031] For example, if the geothermal tail water reinjection volume is greater than or equal to the target geothermal tail water reinjection volume, it is considered that the geothermal tail water reinjection volume at this time can meet the conditions for judging the geothermal tail water reinjection capacity of the sandstone thermal reservoir, and the next step of calculation can be performed.

[0032] Optionally, determining the geothermal tail water energy at the geothermal tail water reinjection penetration point under the target geothermal tail water reinjection amount includes steps A1-A2:

[0033] Step A1: determine a target geothermal tail water reinjection influence radius associated with a target geothermal tail water reinjection amount, wherein the target geothermal tail water reinjection influence radius is determined based on a corresponding mapping relationship between the geothermal tail water reinjection amount and the geothermal tail water reinjection influence radius.

[0034] The influence radius of geothermal tail water reinjection can be called the cold front of reinjected geothermal tail water, which represents the size of the interface formed by the cold water of reinjected geothermal tail water moving towards the warm water.

[0035] Specifically, the target geothermal tail water reinjection influence radius is determined based on the corresponding mapping relationship between the geothermal tail water reinjection volume and the geothermal tail water reinjection influence radius, which can be expressed by the following formula:

[0036]

[0037] Among them, r e is the impact radius of geothermal tailwater reinjection, unit: m; Q G is the daily geothermal tail water reinjection volume at the geothermal tail water reinjection infiltration point, unit: m 3 / d;T Gi is the geothermal tailwater reinjection time, unit: d; is the porosity of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point, in %; D is the effective thickness of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point, in m.

[0038] Step A2: determine the potential energy, kinetic energy and thermal energy of the geothermal tail water at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius, and determine the sum of the potential energy, kinetic energy and thermal energy of the geothermal tail water as the geothermal tail water energy.

[0039] Optionally, determining the potential energy, kinetic energy and thermal energy of the geothermal tail water at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius includes steps B1-B3:

[0040] Step B1, determining the potential energy of the geothermal tail water at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius according to the hot water head depth of the geothermal tail water at the geothermal tail water reinjection penetration point.

[0041] Specifically, according to the hot water head depth of the geothermal tail water at the geothermal tail water reinjection penetration point, the potential energy of the geothermal tail water at the geothermal tail water reinjection penetration point under the target geothermal tail water reinjection influence radius is determined, which can be expressed by the following formula:

[0042] E HP =mgH HG

[0043] Among them, E HP is the potential energy of geothermal tail water at the geothermal tail water reinjection infiltration point, unit is j; H HG is the depth of the hot water head of the geothermal tail water at the geothermal tail water reinjection penetration point, in m, where the hot water head of the geothermal tail water at the geothermal tail water reinjection penetration point can be the water surface of the geothermal tail water reinjected at the geothermal tail water reinjection penetration point; m is the mass of the geothermal tail water reinjected at the geothermal tail water reinjection penetration point, in kg; g is the gravitational acceleration, in m / s 2 .

[0044] Step B2: determine the seepage velocity at the geothermal tail water reinjection infiltration point on the target geothermal tail water reinjection influence radius, and calculate the kinetic energy of the geothermal tail water at the geothermal tail water reinjection infiltration point under the target geothermal tail water reinjection influence radius based on the seepage velocity.

[0045] Specifically, the seepage velocity at the geothermal tail water reinjection infiltration point on the target geothermal tail water reinjection influence radius can be determined by the following formula:

[0046]

[0047] Among them, v sl Q is the seepage velocity at the geothermal tailwater reinjection infiltration point, in m / s; HG is the amount of geothermal tail water reinjection at the geothermal tail water reinjection infiltration point, unit: m 3 / s; is the porosity of the geothermal tail water reinjection sandstone thermal reservoir at the geothermal tail water reinjection penetration point, unit: %; r e is the influence radius of geothermal tail water reinjection, in m; D is the effective thickness of the geothermal tail water reinjection sandstone thermal reservoir at the geothermal tail water reinjection penetration point, in m.

[0048] The kinetic energy of the geothermal tail water at the geothermal tail water reinjection infiltration point within the target geothermal tail water reinjection influence radius is calculated based on the seepage velocity, which can be expressed by the following formula:

[0049]

[0050] Among them, E HK is the kinetic energy of the geothermal tail water at the geothermal tail water reinjection infiltration point, unit: j; v sl is the seepage velocity at the geothermal tail water reinjection infiltration point, in m / s; m is the mass of geothermal tail water reinjected at the geothermal tail water reinjection infiltration point, in kg.

[0051] Step B3: Determine the thermal energy of the geothermal tail water at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius based on the geothermal tail water temperature at the geothermal tail water reinjection penetration point.

[0052] Specifically, according to the geothermal tail water temperature at the geothermal tail water reinjection penetration point, the thermal energy of the geothermal tail water at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius is determined, which can be expressed by the following formula:

[0053] E HR =mC W ℃ H

[0054] E HRis the thermal energy of the geothermal tail water at the geothermal tail water reinjection infiltration point, unit is j; m is the mass of the geothermal tail water reinjected at the geothermal tail water reinjection infiltration point, unit is kg; Cw is the specific heat capacity of water, unit is J / kg·℃; ℃ H It is the geothermal tail water temperature at the geothermal tail water reinjection infiltration point, in °C.

[0055] The sum of the potential energy, kinetic energy and thermal energy of geothermal tail water is determined as the geothermal tail water energy, which can be expressed by the following formula:

[0056] E G =E HP +E HK +E HR

[0057] Among them, E G is the geothermal tail water energy at the geothermal tail water reinjection infiltration point, unit: J; E HP is the potential energy of geothermal tail water at the geothermal tail water reinjection infiltration point, unit is j; E HK is the kinetic energy of the geothermal tail water at the geothermal tail water reinjection infiltration point, unit: J; E HR It is the thermal energy of geothermal tail water at the geothermal tail water reinjection infiltration point, unit is J.

[0058] The above steps determine the geothermal tail water energy through the kinetic energy, potential energy and thermal energy of the geothermal tail water at the geothermal tail water reinjection infiltration point, which overcomes the problem that the existing technology does not take into account the influence of the thermal energy of the geothermal tail water on the geothermal tail water reinjection capacity, and is conducive to improving the accuracy of the judgment of the geothermal tail water reinjection capacity.

[0059] S120. Determine the sandstone thermal reservoir energy at the geothermal tail water reinjection penetration point at the target geothermal tail water reinjection amount.

[0060] Optionally, determining the sandstone thermal reservoir energy at the geothermal tail water reinjection penetration point under the target geothermal tail water reinjection amount includes steps C1-C2:

[0061] Step C1, determining a target geothermal tail water reinjection influence radius associated with a target geothermal tail water reinjection amount, wherein the target geothermal tail water reinjection influence radius is determined based on a corresponding mapping relationship between the geothermal tail water reinjection amount and the geothermal tail water reinjection influence radius.

[0062] Determining the target geothermal tail water reinjection impact radius associated with the target geothermal tail water reinjection amount has been described in the above steps and will not be repeated here.

[0063] Step C2, determining the potential energy and thermal energy of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius, and determining the sum of the potential energy and thermal energy of the sandstone thermal reservoir as the sandstone thermal reservoir energy.

[0064] Optionally, determining the potential energy and thermal energy of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius includes steps D1-D2:

[0065] Step D1, determining the potential energy of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius according to the hot water head depth of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point.

[0066] Specifically, according to the hot water head depth of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point, the potential energy of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point under the target geothermal tail water reinjection influence radius is determined, which can be expressed by the following formula:

[0067] E DP =mgH DR

[0068] Among them, E DP is the potential energy of the sandstone thermal reservoir at the geothermal tailwater reinjection penetration point, unit: J; H DR is the hot water head depth of the sandstone thermal reservoir at the geothermal tailwater reinjection penetration point, in m; m is the geothermal tailwater mass of the sandstone thermal reservoir at the geothermal tailwater reinjection penetration point, in kg; g is the gravitational acceleration, in m / s 2 .

[0069] Step D2: Determine the thermal energy of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius based on the sandstone thermal reservoir temperature at the geothermal tail water reinjection penetration point.

[0070] Optionally, before determining the thermal energy of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius, the method further includes:

[0071] Determine the average specific heat capacity of the reservoir rock and water.

[0072] Specifically, the average specific heat capacity of thermal reservoir rock and water can be expressed by the following formula:

[0073]

[0074] in, is the average specific heat capacity of sandstone thermal reservoir rock and water, in J / kg·℃; ρ e is the rock density of the sandstone thermal reservoir at the geothermal tailwater reinjection penetration point, in kg / m 3 ; C e is the rock specific heat capacity of the sandstone thermal reservoir at the geothermal tailwater reinjection penetration point, in J / kg·℃; ρ w is the geothermal tail water density of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point, in kg / m 3 ; C wThe specific heat capacity of the geothermal tail water in the sandstone thermal reservoir at the geothermal tail water reinjection penetration point, in J / kg·℃; is the porosity of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point, unit: %.

[0075] Specifically, according to the temperature of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point, the thermal energy of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius is determined, which can be expressed by the following formula:

[0076]

[0077] Among them, E DR is the thermal energy of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point, unit is j; m is the geothermal tail water mass of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point, unit is kg; is the average specific heat capacity of sandstone thermal reservoir rock and water, in J / kg·℃; D It is the temperature of the sandstone thermal reservoir at the geothermal tailwater reinjection penetration point, in °C.

[0078] The sum of the potential energy and thermal energy of the sandstone thermal reservoir is determined as the energy of the sandstone thermal reservoir, which can be expressed by the following formula:

[0079] E D =E DP +E DR

[0080] Among them, E D is the energy of the sandstone thermal reservoir at the geothermal tailwater reinjection penetration point, unit: J; E DP is the potential energy of the sandstone thermal reservoir at the geothermal tailwater reinjection penetration point, unit: J; E DR is the thermal energy of the sandstone thermal reservoir at the geothermal tailwater reinjection penetration point, unit: J.

[0081] The above steps determine the energy of the sandstone thermal reservoir through the potential energy and thermal energy of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point, which overcomes the problem that the existing technology does not take into account the influence of the thermal energy of the sandstone thermal reservoir on the geothermal tail water reinjection capacity. At the same time, it also takes into account the influence of the geothermal tail water temperature on the geothermal tail water reinjection capacity of the sandstone thermal reservoir, thereby improving the accuracy of the judgment of the geothermal tail water reinjection capacity.

[0082] S130. Determine whether the sandstone thermal reservoir has the ability to recharge the geothermal tail water at the target geothermal tail water recharge volume based on the geothermal tail water energy and the sandstone thermal reservoir energy.

[0083] Optionally, according to the geothermal tail water energy and the sandstone thermal reservoir energy, determining whether the sandstone thermal reservoir has the ability to recharge the geothermal tail water at the target geothermal tail water recharge volume includes steps E1-E2:

[0084] Step E1: If the energy of geothermal tail water is greater than the energy of the sandstone thermal reservoir, it is determined that the sandstone thermal reservoir has the ability to recharge the geothermal tail water at the target geothermal tail water recharge rate.

[0085] Specifically, if the geothermal tailwater energy E G Greater than the sandstone thermal reservoir energy E D When , it means that the sandstone thermal reservoir has the ability to recharge geothermal tail water under the target geothermal tail water recharge volume.

[0086] Step E2: If the energy of the geothermal tail water is not greater than the energy of the sandstone thermal reservoir, it is determined that the sandstone thermal reservoir does not have the ability to recharge the geothermal tail water at the target geothermal tail water recharge rate.

[0087] Specifically, if the geothermal tailwater energy E G Less than or equal to the sandstone thermal reservoir energy E D When , it means that the sandstone thermal reservoir does not have the ability to recharge geothermal tail water under the target geothermal tail water recharge volume.

[0088] The above steps establish the geothermal tailwater energy E G Sandstone thermal reservoir energy E D The comparative model determines the influence of various energies of sandstone thermal reservoirs on the geothermal tailwater reinjection capacity, which is conducive to improving the accuracy of judging the geothermal tailwater reinjection capacity.

[0089] S140. When the sandstone thermal reservoir has the ability to reinject geothermal tail water, determine the wellhead pressure of the reinjection well required for reinjection of geothermal tail water.

[0090] Optionally, when the sandstone thermal reservoir has the ability to recharge geothermal tail water, determining the wellhead pressure of the recharge well required for recharge of geothermal tail water includes steps F1-F2:

[0091] Step F1, determining the depth difference between the hot water head depth of the geothermal tail water at the geothermal tail water reinjection penetration point and the depth of the wellbore where the sandstone thermal reservoir is encountered.

[0092] The depth of the hot water head of the geothermal tailwater at the geothermal tailwater reinjection infiltration point can be expressed by the following formula:

[0093]

[0094] Among them, H HG H is the depth of the hot water head of the geothermal tailwater at the geothermal tailwater reinjection infiltration point, in m; DR is the hot water head depth of the sandstone thermal reservoir at the geothermal tailwater reinjection penetration point, in m; is the average specific heat capacity of sandstone thermal reservoir rock and water, in J / kg·℃; D v is the temperature of the sandstone thermal reservoir at the geothermal tailwater reinjection penetration point, unit: °C; v slis the seepage velocity at the geothermal tail water reinjection infiltration point, in m / s; Cw is the specific heat capacity of water, in J / kg·℃; H is the geothermal tail water temperature at the geothermal tail water reinjection infiltration point, unit: °C; g is the gravitational acceleration, unit: m / s 2 .

[0095] Specifically, the difference between the depth of the hot water head of the geothermal tail water at the geothermal tail water reinjection penetration point and the depth of the wellbore encountered in the sandstone thermal reservoir can be expressed by the following formula:

[0096] Depth difference = H HG -H0

[0097] Among them, H HG is the depth of hot water head of geothermal tail water at the geothermal tail water reinjection penetration point, in m; H0 is the wellbore depth of the sandstone thermal reservoir, in m.

[0098] Step F2: Determine the wellhead pressure of the reinjection well required for reinjection of the geothermal tail water based on the difference between the hot water head depth of the geothermal tail water and the depth of the wellbore encountered in the sandstone thermal reservoir.

[0099] Specifically, based on the difference between the hot water head depth of the geothermal tail water and the depth of the wellbore encountered in the sandstone thermal reservoir, the wellhead pressure of the reinjection well required for the geothermal tail water reinjection is determined, which can be expressed by the following formula:

[0100]

[0101] Among them, P HG is the wellhead pressure of the geothermal tailwater required for reinjection, in MPa; H HG is the depth of hot water head of geothermal tail water at the geothermal tail water reinjection penetration point, in m; H0 is the wellbore depth of the sandstone thermal reservoir, in m.

[0102] The above steps determine the wellhead pressure of the geothermal tail water reinjection well on the basis of determining that the geothermal tail water has the reinjection capacity. This overcomes the problem that the prior art does not establish the relationship between the geothermal tail water reinjection volume and the wellhead pressure of the geothermal tail water reinjection well based on the geothermal tail water reinjection energy, and provides effective guidance for the design of the geothermal tail water reinjection wellhead pressure of the geothermal heating project.

[0103] Optionally, the above steps further include:

[0104] Control the wellhead pressure of the reinjection well required for geothermal tail water reinjection.

[0105] Specifically, during the production process, the wellhead pressure control conditions of the geothermal tail water reinjection well are:

[0106] P 控制 ≥P HG

[0107] Among them, P 控制 It is the wellhead pressure of the geothermal tail water required for reinjection during production operation, in MPa; P HG It is the wellhead pressure of the reinjection well required for geothermal tail water reinjection, in MPa.

[0108] The above steps determine the wellhead pressure of the geothermal tail water reinjection well required for geothermal tail water reinjection in actual production by predicting the wellhead pressure of the geothermal tail water reinjection well, which can effectively guide the implementation of the geothermal tail water reinjection project in the geothermal heating project and ensure 100% reinjection of geothermal tail water.

[0109] For example, according to the geothermal tail water reinjection flow rate at different geothermal tail water reinjection penetration points, the geothermal tail water reinjection influence radius at different stages is calculated, and it is determined whether the sandstone thermal reservoir has the reinjection capacity for geothermal tail water under the target geothermal tail water reinjection amount. If it has the reinjection capacity, the wellhead pressure P of the geothermal tail water reinjection well is determined. HG , and according to the calculated geothermal tailwater reinjection wellhead pressure P HG The wellhead pressure of the geothermal tail water recharge well is controlled. The calculation results of the geothermal tail water recharge conditions in the sandstone thermal reservoir are shown in Table 1.

[0110] Table 1 Calculation results of geothermal tail water reinjection conditions in sandstone thermal reservoirs

[0111]

[0112] For example, by calculating and determining the measured parameters of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point under the geothermal tail water reinjection amount, as shown in Table 2, the wellhead pressure of the geothermal tail water reinjection well can be obtained. According to the calculated wellhead pressure P of the geothermal tail water reinjection well, HG Control the wellhead pressure of geothermal tailwater reinjection wells.

[0113] Table 2 Parameters for calculating the conditions for geothermal tailwater reinjection in sandstone thermal reservoirs

[0114]

[0115]

[0116] The calculated parameters in the above table are all the calculated parameters at the geothermal tail water reinjection infiltration point.

[0117] The above steps, based on the analysis of the penetration conditions of low-energy reinjected geothermal tail water into the high-energy sandstone thermal reservoir, obtain the wellhead pressure of geothermal tail water reinjection wells under different geothermal tail water reinjection conditions. The determination of the wellhead pressure of geothermal tail water reinjection wells provides a basis for optimizing the design of geothermal tail water reinjection engineering schemes for geothermal heating projects and the control of geothermal tail water reinjection pressure during production and operation.

[0118] The technical solution of this embodiment determines the geothermal tail water energy E at the geothermal tail water reinjection penetration point according to the potential energy, kinetic energy and thermal energy of the geothermal tail water at the penetration point at the geothermal tail water reinjection influence radius. G Under the same conditions, the energy E of the sandstone thermal reservoir at the geothermal tailwater reinjection penetration point is determined according to the potential energy and thermal energy of the sandstone thermal reservoir. D , taking into account the influence of the thermal energy of geothermal tail water and the thermal energy of sandstone thermal reservoir on geothermal tail water reinjection, it is beneficial to improve the accuracy of judging the reinjection capacity of geothermal tail water; judging the reinjection capacity of geothermal tail water in sandstone thermal reservoir based on the calculation results, and calculating the wellhead pressure P of geothermal tail water reinjection well on the basis that the geothermal tail water in sandstone thermal reservoir has reinjection capacity HG , the wellhead pressure of the geothermal tail water reinjection well is controlled, and the method provides a basis for optimizing the design of the geothermal tail water reinjection engineering scheme of the geothermal heating project and the control of the geothermal tail water reinjection pressure during the production and operation process. The present invention avoids the shortcomings of the geothermal tail water reinjection wellhead pressure and seepage resistance analysis method based on fluid mechanics, and provides effective support for the geothermal tail water reinjection technical solution.

[0119] Figure 2 The schematic diagram of the structure of a geothermal tailwater recharge capacity detection device provided by an embodiment of the present invention. Figure 2 As shown, the device includes: a geothermal tail water energy determination module 210, a sandstone thermal reservoir energy determination module 220, a reinjection capacity determination module 230, and a reinjection wellhead pressure determination module 240. Among them:

[0120] The geothermal tail water energy determination module 210 is used to determine the geothermal tail water energy at the geothermal tail water reinjection penetration point under the target geothermal tail water reinjection amount.

[0121] The sandstone thermal reservoir energy determination module 220 is used to determine the sandstone thermal reservoir energy at the geothermal tail water reinjection penetration point under the target geothermal tail water reinjection amount.

[0122] The reinjection capacity determination module 230 is used to determine whether the sandstone thermal reservoir has the reinjection capacity for geothermal tail water at the target geothermal tail water reinjection amount according to the geothermal tail water energy and the sandstone thermal reservoir energy.

[0123] The reinjection wellhead pressure determination module 240 is used to determine the reinjection wellhead pressure required for reinjection of geothermal tail water when the sandstone thermal reservoir has the ability to reinject geothermal tail water.

[0124] In the embodiment of the present application, the geothermal tail water energy determination module 210 includes:

[0125] Reinjection influence radius determination unit: used to determine the target geothermal tail water reinjection influence radius associated with the target geothermal tail water reinjection amount, and the target geothermal tail water reinjection influence radius is determined based on the corresponding mapping relationship between the geothermal tail water reinjection amount and the geothermal tail water reinjection influence radius.

[0126] Geothermal tail water energy determination unit: used to determine the potential energy, kinetic energy and thermal energy of geothermal tail water at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius, and determine the sum of the potential energy, kinetic energy and thermal energy of the geothermal tail water as the geothermal tail water energy.

[0127] Optional, geothermal tailwater energy determination unit, including:

[0128] Potential energy determination subunit: used to determine the potential energy of geothermal tail water at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius based on the hot water head depth of the geothermal tail water at the geothermal tail water reinjection penetration point.

[0129] Kinetic energy determination subunit: used to determine the seepage velocity at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius, and calculate the kinetic energy of the geothermal tail water at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius based on the seepage velocity.

[0130] Thermal energy determination subunit: used to determine the thermal energy of geothermal tail water at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius based on the geothermal tail water temperature at the geothermal tail water reinjection penetration point.

[0131] In the embodiment of the present application, the sandstone thermal reservoir energy determination module 220 includes:

[0132] Reinjection influence radius determination unit: used to determine the target geothermal tail water reinjection influence radius associated with the target geothermal tail water reinjection amount, and the target geothermal tail water reinjection influence radius is determined based on the corresponding mapping relationship between the geothermal tail water reinjection amount and the geothermal tail water reinjection influence radius.

[0133] Sandstone thermal reservoir energy determination unit: used to determine the potential energy and thermal energy of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius, and determine the sum of the potential energy and thermal energy of the sandstone thermal reservoir as the sandstone thermal reservoir energy.

[0134] Optionally, a sandstone thermal reservoir energy determination unit, comprising:

[0135] Potential energy determination subunit: used to determine the potential energy of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius according to the hot water head depth of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point.

[0136] Thermal energy determination subunit: used to determine the thermal energy of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius based on the sandstone thermal reservoir temperature at the geothermal tail water reinjection penetration point.

[0137] In the embodiment of the present application, the recharging capacity determination module 230 includes:

[0138] Reinjection capacity determination unit: used to determine whether the sandstone thermal reservoir has the ability to recharge the geothermal tail water at the target geothermal tail water recharge volume if the geothermal tail water energy is greater than the sandstone thermal reservoir energy.

[0139] The unit for determining the lack of reinjection capacity is used to determine that the sandstone thermal reservoir has no reinjection capacity for the geothermal tail water at the target geothermal tail water reinjection amount if the geothermal tail water energy is not greater than the sandstone thermal reservoir energy.

[0140] In the embodiment of the present application, the wellhead pressure determination module 240 of the recharging well includes:

[0141] A depth difference determination unit for the wellbore depth: used to determine the depth difference between the hot water head depth of the geothermal tail water at the geothermal tail water reinjection penetration point and the wellbore depth of the sandstone thermal reservoir encountered by drilling;

[0142] Wellhead pressure determination unit: used to determine the wellhead pressure of the reinjection well required for geothermal tail water reinjection based on the depth difference between the hot water head depth of the geothermal tail water and the depth of the wellbore encountered in the sandstone thermal reservoir.

[0143] The geothermal tail water re-injection capacity detection device provided in the embodiment of the present invention can execute the geothermal tail water re-injection capacity detection method provided in any embodiment of the present invention, and has the corresponding functions and beneficial effects of executing the geothermal tail water re-injection capacity detection method. For detailed process, please refer to the relevant operations of the geothermal tail water re-injection capacity detection method in the aforementioned embodiment.

[0144] Figure 3 A schematic diagram of the structure of an electronic device for implementing a method for detecting the geothermal tailwater recharge capacity of an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0145] like Figure 3As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0146] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0147] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The processor 11 executes the various methods and processes described herein, such as a method for detecting the geothermal tailwater recharge capacity.

[0148] In some embodiments, the geothermal tailwater recharge capacity detection method can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed at the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method for geothermal tailwater recharge capacity detection X described in the text can be executed. Alternatively, in other embodiments, the processor 11 can be configured to execute the geothermal tailwater recharge capacity detection method in any other appropriate manner (for example, by means of firmware).

[0149] Various implementations of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted at a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0150] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely at the machine, partially at the machine, partially at the machine and partially at a remote machine as a stand-alone software package, or entirely at a remote machine or server.

[0151] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, device, or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the contents described. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the contents described.

[0152] To provide interaction with a user, the systems and techniques described herein may be implemented at an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0153] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0154] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The relationship between the client and the server is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0155] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0156] The specific implementation modes described here do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting geothermal tail water recharge capacity, characterized in that: include: Determine the geothermal tail water energy at the geothermal tail water reinjection penetration point under the target geothermal tail water reinjection volume; Determine the sandstone thermal reservoir energy at the geothermal tailwater reinjection penetration point at the target geothermal tailwater reinjection volume; Determining whether the sandstone thermal reservoir has the ability to recharge the geothermal tail water at the target geothermal tail water recharge volume according to the geothermal tail water energy and the sandstone thermal reservoir energy; When the sandstone thermal reservoir has the ability to reinject geothermal tail water, determine the wellhead pressure of the reinjection well required for geothermal tail water reinjection.

2. The method according to claim 1, characterized in that Determine the geothermal tail water energy at the geothermal tail water reinjection penetration point under the target geothermal tail water reinjection volume, including: Determine a target geothermal tail water reinjection impact radius associated with a target geothermal tail water reinjection amount, wherein the target geothermal tail water reinjection impact radius is determined based on a corresponding mapping relationship between the geothermal tail water reinjection amount and the geothermal tail water reinjection impact radius; The potential energy, kinetic energy and thermal energy of the geothermal tail water at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius are determined, and the sum of the potential energy, kinetic energy and thermal energy of the geothermal tail water is determined as the geothermal tail water energy.

3. The method according to claim 2, characterized in that Determine the potential energy, kinetic energy and thermal energy of the geothermal tail water at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius, including: Determine the potential energy of the geothermal tail water at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius according to the hot water head depth of the geothermal tail water at the geothermal tail water reinjection penetration point; Determine the seepage velocity at the geothermal tail water reinjection infiltration point on the target geothermal tail water reinjection influence radius, and calculate the kinetic energy of the geothermal tail water at the geothermal tail water reinjection infiltration point under the target geothermal tail water reinjection influence radius based on the seepage velocity; According to the geothermal tail water temperature at the geothermal tail water reinjection penetration point, the thermal energy of the geothermal tail water at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius is determined.

4. The method according to claim 1, characterized in that: Determine the sandstone thermal reservoir energy at the geothermal tailwater reinjection penetration point at the target geothermal tailwater reinjection volume, including: Determine a target geothermal tail water reinjection impact radius associated with a target geothermal tail water reinjection amount, wherein the target geothermal tail water reinjection impact radius is determined based on a corresponding mapping relationship between the geothermal tail water reinjection amount and the geothermal tail water reinjection impact radius; The potential energy and thermal energy of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius are determined, and the sum of the potential energy and thermal energy of the sandstone thermal reservoir is determined as the sandstone thermal reservoir energy.

5. The method according to claim 4, characterized in that Determine the potential energy and thermal energy of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius, including: Determine the potential energy of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius according to the hot water head depth of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point; According to the temperature of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point, the thermal energy of the sandstone thermal reservoir at the geothermal tail water reinjection penetration point within the target geothermal tail water reinjection influence radius is determined.

6. The method according to claim 1, characterized in that Determining whether the sandstone thermal reservoir has the ability to recharge the geothermal tail water at the target geothermal tail water recharge volume based on the geothermal tail water energy and the sandstone thermal reservoir energy, including: If the geothermal tail water energy is greater than the sandstone thermal reservoir energy, it is determined that the sandstone thermal reservoir has the ability to recharge the geothermal tail water at the target geothermal tail water recharge volume; If the energy of the geothermal tail water is not greater than the energy of the sandstone thermal reservoir, it is determined that the sandstone thermal reservoir does not have the ability to recharge the geothermal tail water at the target geothermal tail water recharge rate.

7. The method according to claim 1, characterized in that Determine the required wellhead pressure for geothermal tailwater reinjection, including: Determine the difference between the depth of the hot water head of the geothermal tailwater at the geothermal tailwater reinjection penetration point and the depth of the wellbore drilled into the sandstone thermal reservoir; Based on the difference between the hot water head depth of the geothermal tail water and the depth of the wellbore encountered in the sandstone thermal reservoir, the wellhead pressure of the reinjection well required for the geothermal tail water reinjection is determined.

8. A geothermal tail water recharge capacity detection device, characterized in that: include: A geothermal tail water energy determination module, used to determine the geothermal tail water energy at the geothermal tail water reinjection penetration point under the target geothermal tail water reinjection amount; A sandstone thermal reservoir energy determination module is used to determine the sandstone thermal reservoir energy at the geothermal tail water reinjection penetration point under the target geothermal tail water reinjection amount; A reinjection capacity determination module, for determining whether the sandstone thermal reservoir has the reinjection capacity for geothermal tail water at the target geothermal tail water reinjection amount according to the geothermal tail water energy and the sandstone thermal reservoir energy; The module for determining the wellhead pressure of the reinjection well is used to determine the wellhead pressure of the reinjection well required for reinjection of geothermal tail water when the sandstone thermal reservoir has the ability to reinject geothermal tail water.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the geothermal tail water reinjection capacity detection method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the geothermal tail water reinjection capacity detection method according to any one of claims 1 to 7 when executed.

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