Hydrothermal geothermal simulation device and method combining physical model and mathematical model

Abstract

The invention discloses a hydrothermal geothermal simulation device and method combining a physical model with a mathematical model. The device comprises a temperature measuring device in contact with a rock sample in a rock permeability experimental device; the temperature measuring device comprises a temperature measuring end and a connecting end; the temperature measuring end is inserted into the rock sample, and the connecting end is electrically connected to a voltage-stabilized power supply and a digital temperature meter; the data interface of the digital temperature meter is connected to a computer; when in use, the simulation device is first used to measure the permeability and other parameters of the rock sample heat storage, and then numerical simulation is used as a bridge and tool to calibrate the numerical model with indoor test parameters and results, and then the numerical model is used to simulate a large-scale engineering site, so as to deepen the understanding of the geothermal field and improve the rationality of the arrangement of geothermal production wells and reinjection wells.

Description

Technical Field

[0001] The present invention relates to physical simulation and mathematical simulation of hydrothermal geothermal in medium and deep layers, and can be used for exploration and evaluation of hydrothermal geothermal resources and design of mining and reinjection wells. Background Art

[0002] In the process of geothermal resource exploration, evaluation and development, it is necessary to identify the reservoir, caprock, recharge and runoff conditions of geothermal resources, on this basis, to optimize the location of mining wells and reinjection wells, and to carry out geothermal resource exploitation. In the process of determining the position, in order to prevent the cold water in the reinjection well from directly penetrating the mining well, lowering the water temperature of the mining well and forming the so-called thermal breakthrough problem, it is necessary to select a larger spacing between the mining and reinjection wells. However, if the spacing is too large, the occupied area will increase, which will cause waste of site and geothermal resources.

[0003] In order to determine the appropriate spacing between production and reinjection wells, the commonly used methods include engineering experience, analytical methods, and numerical simulation methods. The engineering experience method requires reference to existing engineering experience and requires engineering examples that basically match the existing engineering conditions. If the conditions of the reference project, such as thermal reservoir permeability, thermal physical parameters, thickness, boundary conditions, etc., are greatly different from those of the current project, then the reference value is not high. Moreover, engineering experience can only determine whether the project is feasible, but cannot determine how much margin the plan has.

[0004] The analytical method is a better method for simple engineering geological conditions, but simple geological conditions are not available for every project.

[0005] Numerical simulation methods are divided into finite element method, finite difference method and the combination of the two, etc. This method can simulate complex boundary conditions, complex spatial distribution of thermal reservoirs and caprocks, and complex heat and mass transfer processes, but how to ensure the accuracy of calculation parameters and further ensure the reliability of calculation results has always been a bottleneck technology that plagues numerical simulation.

[0006] In addition, hydrothermal geothermal simulation not only needs to simulate the seepage of geothermal water but also the heat conduction of the water flow process. Its complexity is greatly increased, there are more calculation parameters, its controlling equations are more complicated, and the reliability of the calculation results is lower.

[0007] The existing rock permeability test and thermal conductivity test are measured using different devices respectively. It is often necessary to move the rock sample to another thermal conductivity test device for operation after the permeability test. The operation process is complicated and cumbersome, and the sample moving process also increases the inaccuracy of the test results. At present, there is no hydrothermal geothermal simulation device and method that can test both permeability and thermal conductivity. Summary of the invention

[0008] The purpose of the present invention is to provide a hydrothermal geothermal simulation device and method combining a physical model with a mathematical model.

[0009] The technical means adopted in the present invention are as follows.

[0010] A hydrothermal geothermal simulation device combining a physical model with a mathematical model comprises a temperature measuring device in contact with a rock sample in a rock permeability experimental device; the temperature measuring device comprises a temperature measuring end and a connecting end; the temperature measuring end is inserted into the rock sample, the connecting end is electrically connected to a voltage-stabilized power supply and a digital temperature meter; the data interface of the digital temperature meter is connected to a computer.

[0011] Furthermore, the temperature measuring device is a hot needle, which includes a needle body, and the needle body is inserted into the rock sample; the hot needle also includes a temperature measuring wire and a heating wire connected to the top of the needle body, the temperature measuring wire is electrically connected to the digital thermometer, and the heating wire is connected to the regulated power supply.

[0012] Furthermore, a first filler is filled between the needle body and the rock sample, and the first filler is a material that has thermal conductivity but is not electrically conductive.

[0013] Furthermore, the needle body includes a needle body shell having a hollow cavity structure, and a plurality of enameled copper wires are arranged inside the needle body shell; a second filler is filled between the enameled copper wires and between the enameled copper wires and the needle body shell; the second filler is a material that is thermally conductive but not electrically conductive.

[0014] Furthermore, the diameter of the needle body is between 3 mm and 6 mm.

[0015] Furthermore, the rock permeability experimental device comprises a pressure chamber); the top of the pressure chamber is sealed with an upper cover, the upper cover is provided with an external connection hole connected to the flow monitoring system and a temperature measuring hole for inserting the temperature measuring end, and the bottom is connected to a water source system and a pressurizing device; a base connected to the pressurizing device is also provided in the pressure chamber, and the base can move up and down under the drive of the pressurizing device.

[0016] Furthermore, the base is a centrally symmetrical structure, which is sequentially connected with a perforated partition plate, a fulcrum ball and a lower bottom support plate from bottom to top, and a plurality of through holes are opened on the perforated partition plate.

[0017] Furthermore, a spring is provided between the perforated partition plate and the lower supporting plate.

[0018] The present invention also discloses a simulation method of a hydrothermal geothermal simulation device combining a physical model with a mathematical model, which comprises the following simulation steps.

[0019] ①, Preparation of rock samples: obtain thermal storage rock samples from the engineering site through geological drilling, grind them into a cylindrical structure that matches the rock permeability experimental device, and open a central through hole in the center of the cylindrical rock sample.

[0020] ②, place the rock sample on the lower bottom support plate, and drive the pressure device so that the rock sample is clamped between the upper cover and the lower bottom support plate; at the same time, pass the needle through the temperature measuring hole and insert along the top surface of the rock sample.

[0021] ③, Rock permeability test: Perform a permeability test according to the process and method of the rock permeability test to obtain the radial permeability of the rock sample.

[0022] ④. Electrically connect the temperature measuring wire of the hot needle to the digital display thermometer, and connect the data interface of the digital display thermometer to the computer; the heating wire of the hot needle is connected to the voltage-stabilized power supply.

[0023] ⑤, Attenuation curve test: The computer is used to control the heating of the needle body of the hot needle. The needle body is powered off after instantaneous heating. The attenuation curve of the needle body temperature over time is tested and recorded.

[0024] ⑥, fitting curve: Substitute the permeability measured in step ③ into the numerical calculation model to obtain a calculation curve; adjust the calculation parameters of the numerical calculation model to make the calculation curve fit the attenuation curve in step ⑤, and record the adjustment parameters that meet the requirements after fitting.

[0025] ⑦, using the adjustment parameters in step ⑥, according to the actual project, establish a numerical model, and calculate the locations of the production well and the reinjection well.

[0026] The beneficial effects produced by the present invention are as follows.

[0027] 1. The present invention is based on precise simulation of small-scale indoor experiments, provides parameters for numerical model calculations, verifies the calculation process and results of the numerical model, and then uses the verified numerical model to simulate large-scale on-site physical simulations to improve the accuracy of numerical simulations, provide a basis for the reasonable setting of production wells and reinjection wells, and optimize the design of well spacing.

[0028] 2. The small-scale indoor test is based on the traditional rock permeability test device, and a hot needle part is added to simulate the impact of injecting fluids of different temperatures into the injection well. It can measure the change of injection well water temperature over time. It is an accurate non-steady flow simulation device.

[0029] 3. The technical idea of ​​the present invention is to use a small-sized, controllable indoor model as a basis, numerical simulation as a bridge and tool, use indoor test parameters and results to calibrate the numerical model, and then use the numerical model to simulate a large-scale engineering site, deepen the understanding of the geothermal field, and improve the rationality of the layout of geothermal production wells and reinjection wells. The present invention is a complete solution for accurately simulating hydrothermal geothermal fluids, and is one of the effective means to ensure the stable operation of medium-deep hydrothermal heating systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the simulation device of the present invention.

[0031] Figure 2 Schematic diagram of plane radial seepage in rock sample.

[0032] Figure 3 This is a schematic diagram of the longitudinal cross-sectional structure of the hot needle.

[0033] Figure 4 This is a schematic diagram of the transverse cross-sectional structure of the heat needle.

[0034] Figure 5 is the decay curve of needle body temperature over time.

[0035] Figure 6 It is a simulation flow chart of the present invention. DETAILED DESCRIPTION

[0036] See also Figure 6 The simulation flow chart of the present invention. The present invention is roughly divided into two parts. The first part is a small-scale indoor simulation device. This part improves the traditional rock permeability test device and adds a hot needle to the rock sample to simulate the impact of the injection well. In engineering practice, the water temperature of the injection well is generally low, while the temperature of the mining well is higher because it mines underground hot water. Taking into account the convenience of simulation, without violating the basic principles, the small-scale indoor test uses a hot needle to simulate the injection well, which can simulate the injection of high-temperature geothermal fluid into the injection well by instantaneously heating the hot needle. After instantaneous heating, the attenuation curve of the hot needle temperature over time can be measured, and the curve can be used to correct the calculation parameters and calculation process of the numerical model. The rock test adopted by the small-scale indoor simulation device uses sampling at the engineering site to obtain parameters such as the permeability of the heat reservoir for use in the numerical calculation model.

[0037] The second part is to propose a method of simulating geothermal fluids by combining physical models with numerical models. Based on a small-scale, controllable indoor model, with numerical simulation as a bridge and tool, the numerical model is calibrated with indoor test parameters and results, and then the numerical model is used to simulate large-scale engineering sites, deepen the understanding of geothermal fields, and improve the rationality of the layout of geothermal production wells and reinjection wells.

[0038] The above two parts will be elaborated in detail below.

[0039] See also Figure 1 Schematic diagram of the simulation device of the present invention. A hydrothermal geothermal simulation device combining a physical model and a mathematical model of the present invention comprises a rock permeability experimental device 1 and a temperature measuring device in contact with a rock sample 3 in the rock permeability experimental device 1. The temperature measuring device comprises a temperature measuring end and a connecting end; the temperature measuring end is inserted into the rock sample 3, and the connecting end is electrically connected to a voltage-stabilized power supply and a digital display thermometer; the data interface of the digital display thermometer is connected to a computer.

[0040] The rock permeability experimental device 1 comprises a pressure chamber 10, the top of which is sealed with an upper cover 113, the upper cover 113 is provided with an external connection hole 111 connected to a flow monitoring system and a temperature measuring hole 112 for inserting the temperature measuring end, and the bottom is connected to a water source system and a pressurizing device; a base connected to the pressurizing device is also provided in the pressure chamber 10; the cross-sectional area of ​​the base is smaller than the cross-sectional area of ​​the pressure chamber 10; therefore, the base can move up and down under the drive of the pressurizing device.

[0041] Furthermore, in one preferred embodiment of the present invention, the base is a centrally symmetrical structure, which is sequentially connected with a perforated partition plate 101, a fulcrum ball 102 and a lower bottom support plate 103 from bottom to top. The cross-sectional area of ​​the perforated partition plate 101 is larger than the cross-sectional area of ​​the lower bottom support plate 103, and a plurality of through holes are provided on the perforated partition plate 101. A spring 100 is also provided between the perforated partition plate 101 and the lower bottom support plate 103 to ensure the balance of the lower bottom support plate 103 when moving up and down. Furthermore, the fulcrum ball 102 is preferably spherical, with its upper surface located at the central depression of the lower surface of the lower bottom support plate 103, and its lower surface located at the central depression of the upper surface of the perforated partition plate 101. The provision of the fulcrum ball 102 is used, on the one hand, to balance the connection between the lower bottom support plate 103 and the perforated partition plate 101, and on the other hand, to ensure that the through holes on the perforated partition plate 101 are not blocked.

[0042] Furthermore, in one preferred embodiment of the present invention, the pressurizing device comprises a pressurizing plunger 200 connected to the bottom center of the pressure chamber 10, and the pressurizing plunger 200 has a hollow cavity filled with silicone oil. A through hole is provided at the connection between the pressurizing plunger 200 and the bottom of the pressure chamber 10, so that the pressurizing shaft 201 can move freely between the pressure chamber 10 and the cavity of the pressurizing plunger 200. A card 202 is connected to the top of the pressurizing shaft 201, and the end of the card 202 away from the pressurizing shaft 201 is connected to the perforated partition plate 101. Furthermore, the card 202 and the pressurizing shaft 201 can be connected by a through-thread at the center of the card 202.

[0043] In one preferred embodiment of the present invention, the rock sample is placed on the lower support plate. Furthermore, a lower rubber pad 32 can be placed between the lower support plate and the rock sample, and an upper rubber pad 31 can be placed between the rock sample and the upper cover 113. When the rock permeability experimental device 1 is in use, the pressure plunger does not move, the pressure plug space is filled with silicone oil, the silicone oil is pressurized, the silicone oil pushes the pressure shaft to move upward, the pressure shaft drives the card, the card drives the perforated partition plate, the fulcrum ball and the lower support plate to move upward, the upper and lower rubber pads of the rock sample are pressed against the rock sample, the permeation channel on the upper top surface and the lower bottom surface of the rock sample is blocked, and the annular inward seepage condition of the rock sample is achieved. The spring between the lower support plate and the perforated partition plate keeps the lower support plate balanced.

[0044] The pressurizing device, pressurizing method and principle of pressurizing silicone oil described above are all prior art and will not be elaborated here.

[0045] See also Figure 3 and Figure 4 The hydrothermal geothermal simulation device combining a physical model with a mathematical model of the present invention further comprises a temperature measuring device. In a preferred embodiment of the present invention, the temperature measuring device is a hot needle 2, and the hot needle 2 comprises a needle body 21, and the needle body 21 is inserted into the rock sample 3. The hot needle 2 also comprises a temperature measuring wire 22 and a heating wire 23 connected to the top of the needle body 21, the temperature measuring wire 22 is electrically connected to the digital display thermometer, and the heating wire 23 is connected to the voltage-stabilized power supply.

[0046] Furthermore, a first filler (not shown) is filled between the needle body 21 and the rock sample 3, and the first filler is a material with thermal conductivity but not electrical conductivity. The needle body 21 comprises a needle body shell 211 with a hollow cavity structure, and a plurality of enameled copper wires 212 are arranged in the needle body shell 211.

[0047] Furthermore, the needle body 21 can be made of a wound enameled copper wire 212 encapsulated in a small diameter stainless steel tube (i.e., the needle body shell mentioned above). The gaps between adjacent enameled copper wires 212 and between the needle body shell and a plurality of enameled copper wires are filled with a second filler; the second filler is a material with thermal conductivity but no electrical conductivity.

[0048] Furthermore, the first filler and the second filler are preferably thermal conductive silicone grease. The diameter of the needle body 21 is preferably 3 mm to 6 mm.

[0049] Furthermore, a sealing cap 213 matching the temperature measuring hole 112 is also provided on the top of the heat needle 2 to ensure good sealing conditions of the pressure chamber.

[0050] Please also read Figure 2When using the hydrothermal geothermal simulation device combining a physical model with a mathematical model described in the present invention, the following simulation steps and methods are also included.

[0051] ①, Preparation of rock samples: The thermal reservoir rock samples of the engineering site are obtained through geological drilling, and then polished into a cylindrical structure with a diameter of 50mm and a height of 100mm, generally. At the same time, a central through hole 30 is opened in the center of the cylindrical rock sample.

[0052] Furthermore, considering the boundary effect, a borehole is opened at the center of the semi-ring of the rock sample for installing the needle body of the hot needle, and the space between the needle body and the hole wall of the borehole is densely filled with thermal grease to maintain good thermal conductivity.

[0053] Furthermore, the volume of the rock sample is smaller than the volume of the pressure chamber, so as to ensure that an annular space 110 is formed between the rock sample and the pressure chamber for fluid to flow through.

[0054] ②, place the rock sample 3 on the lower bottom support plate 103, start the pressurizing device, and drive the pressurizing device to clamp the rock sample 3 between the upper cover 113 and the lower bottom support plate 103, blocking the permeation channels on the upper top surface and the lower bottom surface of the rock sample 3, achieving the annular inward permeation condition of the rock sample and the permeation of the fluid in the rock sample. At the same time, the needle body 21 is inserted into the rock sample through the temperature measuring hole on the upper cover 113 and along the drilled hole on the top surface of the rock sample 3.

[0055] Furthermore, an upper rubber pad 31 and a lower rubber pad 32 are provided on the top and bottom of the rock sample, respectively, which are compressed after being pressurized by the upper cover 113, the lower bottom support plate and the pressure pile plug to cut off the vertical seepage conditions of the rock sample. The test fluid enters the pressure chamber through the external water source pipe and the pressure regulating valve to reach the outside of the rock sample column. The fluid flows from the outside to the inside, forming a stable planar radial inward seepage. The fluid that penetrates into the center hole of the sample enters the external pipe and then enters the flowmeter. The spring and the fulcrum ball ensure that the axis of the sample is under pressure. The perforated partition plate provides a sample placement platform and allows the fluid to flow through.

[0056] ③, Rock permeability test: Perform a permeability test according to the process and method of the rock permeability test to obtain the radial permeability of the rock sample 3; the process of the rock permeability test is a prior art and will not be repeated here. A stable geothermal fluid seepage is formed in the rock sample. The radial permeability of the rock sample can be obtained based on the fluid pressure outside the rock sample and the center hole pressure, as well as the sample size. This value can be used as a basic value and input into the numerical calculation model. Other parameters of the numerical calculation model, such as heat capacity, thermal conductivity, etc., can take empirical values ​​as basic values.

[0057] ④. The temperature measuring wire 22 of the hot needle 2 is electrically connected to the digital display thermometer, and the data interface of the digital display thermometer is connected to the computer; the heating wire 23 of the hot needle 2 is connected to the voltage-stabilized power supply.

[0058] ⑤, attenuation curve test: the computer is used to control the needle body 21 of the hot needle 2 to heat up, the needle body 21 is powered off after instantaneous heating, and the attenuation curve of the temperature of the needle body 21 over time is tested and recorded.

[0059] When a constant voltage is applied to the copper wire inside the needle body, the needle body is equivalent to a linear heat source that generates constant power per unit length. Therefore, after the needle body is instantly heated and the power is turned off, the decay curve of the needle body temperature over time can be measured.

[0060] ⑥, fitting curve: use a numerical calculation model to simulate the boundary conditions, hot needles, and seepage conditions of the indoor test, substitute the permeability measured in step ③ into the numerical calculation model to obtain a calculation curve; adjust the calculation parameters of the numerical calculation model to make the calculation curve fit the attenuation curve in step ⑤, and adjust the calculation parameters when fitting the attenuation curve according to the deviation between the calculation curve and the measured attenuation curve. Finally, record the adjustment parameters that meet the requirements after fitting.

[0061] Furthermore, the attenuation curve can be used to correct the calculation parameters and calculation process of the numerical calculation model. That is, by adjusting the permeability, heat capacity, thermal conductivity and other parameters of the rock sample in the numerical calculation model, the calculation curve is matched with the measured attenuation curve, and the adjustment parameters that can reflect the actual project are obtained.

[0062] It is worth noting that the boundary conditions include the shape and size of the sample, the pressure conditions around the sample, etc. The seepage condition refers to the radial inward seepage, and the simulation is simulated by numerical modeling. This part is an existing method and will not be repeated here.

[0063] The attenuation curve is fitted until satisfaction is achieved. The satisfaction mentioned in this article can be based on the experience of those skilled in the art, or satisfaction can be achieved by making the calculated curve infinitely close to the attenuation curve during the fitting process.

[0064] ⑦, using the adjustment parameters in step ⑥, according to the actual project, establish a numerical model, and calculate the locations of the production well and the reinjection well.

[0065] The numerical model established at this time is based on the actual project, such as the project boundary conditions, formation conditions, etc., which is much more complicated than the test model (i.e., numerical calculation model) mentioned above; but the basic calculation formula is consistent with the test model. After the numerical model is established, the minimum well spacing is determined based on whether there is thermal breakdown between the production well and the reinjection well, and the reasonable layout of the production well and reinjection well is calculated and analyzed to provide a basis for engineering design.

[0066] The implementation process actually uses numerical simulation as a bridge and link between the small-scale indoor simulation device and the engineering site. The internal structure of the small-scale indoor simulation device is clear, controllable and measurable. The numerical model can easily simulate the indoor specimen and adjust its calculation parameters and calculation methods. Combined with the actual engineering site, a full-scale model is established, and the adjusted calculation parameters and calculation methods are used to simulate the engineering site, which can greatly increase the accuracy and reliability of the simulation results.

Claims

1. A hydrothermal geothermal simulation device combining a physical model with a mathematical model, characterized in that: It comprises a temperature measuring device in contact with a rock sample (3) in a rock permeability experimental device (1); The temperature measuring device comprises a temperature measuring end and a connecting end; the temperature measuring end is inserted into the rock sample (3), and the connecting end is electrically connected to a voltage-stabilized power supply and a digital temperature meter; The data interface of the digital temperature meter is connected to the computer; The temperature measuring device is a hot needle (2), the hot needle (2) comprising a needle body (21), and the needle body (21) is inserted into the rock sample (3); The hot needle (2) further comprises a temperature measuring wire (22) and a heating wire (23) connected to the top of the needle body (21), the temperature measuring wire (22) being electrically connected to the digital temperature meter, and the heating wire (23) being connected to the voltage-stabilized power supply; The rock permeability experimental device (1) comprises a pressure chamber (10); The top of the pressure chamber (10) is sealed with an upper cover (113), the upper cover (113) is provided with an external connection hole (111) connected to a flow monitoring system and a temperature measuring hole (112) for inserting the temperature measuring end, and the bottom is connected to a water source system and a pressurizing device; A base connected to the pressurizing device is also provided in the pressure chamber (10), and the base can move up and down under the drive of the pressurizing device; The rock sample (3) is clamped between the upper cover (113) and the base; the volume of the rock sample (3) is smaller than the volume of the pressure chamber (10), and an annular space area (110) is formed between the rock sample (3) and the pressure chamber (10) through which fluid can flow.

2. The hydrothermal geothermal simulation device combining a physical model and a mathematical model as claimed in claim 1, characterized in that: A first filler is filled between the needle body (21) and the rock sample (3), and the first filler is a material that has thermal conductivity but is not electrically conductive.

3. The hydrothermal geothermal simulation device combining a physical model and a mathematical model as claimed in claim 1, characterized in that: The needle body (21) comprises a needle body shell (211) having a hollow cavity structure, and a plurality of enameled copper wires (212) are arranged in the needle body shell (211); A second filler is filled between the enameled copper wires (212) and between the enameled copper wires (212) and the needle body shell (211); the second filler is a material that has thermal conductivity but is not electrically conductive.

4. The hydrothermal geothermal simulation device combining a physical model and a mathematical model according to claim 1, characterized in that: The diameter of the needle body (21) is between 3 mm and 6 mm.

5. The hydrothermal geothermal simulation device combining a physical model and a mathematical model as claimed in claim 1, characterized in that: The base is a centrally symmetrical structure, and is sequentially connected with a perforated partition plate (101), a fulcrum ball (102) and a lower support plate (103) from bottom to top, and a plurality of through holes are provided on the perforated partition plate (101).

6. The hydrothermal geothermal simulation device combining a physical model and a mathematical model as claimed in claim 5, characterized in that: A spring (100) is also provided between the perforated partition plate (101) and the lower supporting plate (103).

7. A simulation method using a hydrothermal geothermal simulation device combining a physical model and a mathematical model as described in any one of claims 1 to 6, characterized in that: The simulation steps include: ①, rock sample preparation: obtain a thermal reservoir rock sample from the engineering site through geological drilling, grind it into a cylindrical structure that matches the rock permeability experimental device (1), and open a central through hole (30) in the center of the cylindrical rock sample; ②, placing the rock sample (3) on the lower support plate (103), and under the driving of the pressure device, causing the rock sample (3) to be clamped between the upper cover (113) and the lower support plate (103); at the same time, inserting the needle body (21) through the temperature measuring hole and along the top surface of the rock sample (3); ③, rock permeability test: perform a permeability test according to the process and method of rock permeability test to obtain the radial permeability of the rock sample (3); ④, electrically connecting the temperature measuring wire (22) of the hot needle (2) to the digital display thermometer, and connecting the data interface of the digital display thermometer to a computer; connecting the heating wire (23) of the hot needle (2) to the voltage-stabilized power supply; ⑤, decay curve test: using the computer to control the needle body (21) of the heat needle (2) to heat up, the needle body (21) is powered off after instantaneous heating, and the decay curve of the temperature of the needle body (21) over time is tested and recorded; ⑥, fitting curve: Substitute the permeability measured in step ③ into the numerical calculation model to obtain a calculation curve; adjust the calculation parameters of the numerical calculation model to make the calculation curve fit the attenuation curve in step ⑤, and record the adjustment parameters that meet the requirements after fitting; ⑦, using the adjustment parameters in step ⑥, according to the actual project, establish a numerical model, and calculate the locations of the production well and the reinjection well.

Images