Skid-mounted device and method for testing heat exchange capacity of mid-deep geothermal well

Abstract

The invention discloses a skid-mounted device and method for testing the heat exchange capacity of a mid-deep geothermal well, an energy unit module is used for providing a set cold and heat source with a certain flow and a constant temperature to simulate the actual operation condition of a user side, and during testing, only one mid-deep heat exchange well needs to be drilled and connected with a mid-deep coaxial sleeve heat exchange well tube, so that the test efficiency is greatly improved. A closed loop is formed, the heat exchange capacity of the geothermal well can be accurately displayed or calculated, punctual and effective information and data are provided for follow-up project function design, and the method can be used for water leakage quality detection of the coaxial sleeve geothermal well. The energy supply hydraulic module and the heat exchange hydraulic module are respectively provided with an intelligent electromagnetic or ultrasonic heat meter, a flowmeter, a thermometer and a pressure gauge, so that on-site recording and timely, accurate and remote transmission to a control center can be realized, and the heat exchange capability of a middle-deep layer coaxial tube heat exchange well in a mode of absorbing heat from a middle-deep layer coaxial tube heat exchange system to soil in winter can be really simulated; and the heat absorption capacity of the underground rock soil is tested and calculated.

Description

Technical Field

[0001] The present invention belongs to the technical field of medium-deep geothermal well testing, and particularly relates to a skid-mounted testing device and method for the heat exchange capacity of medium-deep geothermal wells. Background Technique

[0002] In recent years, geothermal energy, as a clean and renewable energy source, has been widely promoted and applied. However, due to factors such as region, climate environment, crustal geothermal field, and underground aquifer, the popularization and application of medium-deep geothermal heating technology have certain limitations. In order to further study the heat exchange capacity of medium-deep geothermal wells, the in-situ testing technology for the thermal properties of geothermal energy has emerged.

[0004] At present, the testing equipment for the thermal properties of geothermal energy mainly targets the thermal property testing of shallow formations, and there is no matching heat exchange capacity tester for medium-deep coaxial casing geothermal wells. Currently, only shallow testers can be used instead, or energy meters can be used for approximate detection; shallow testers cannot adapt to a stable energy supply device, usually only one energy meter is set, but the measurement data is inaccurate and cannot give the construction unit the correct geothermal heat data, resulting in fuzzy construction by the construction party and easily causing various problems such as subsequent heating failures and instability. Given the increasingly wide application of medium-deep geothermal energy in China, the corresponding testing technology and testing equipment are particularly important.

[0005] Therefore, for those skilled in the art, there is an urgent need to design a precise, stable, reliable, and convenient testing device to study the heat exchange capacity of medium-deep wells with different underground soil heat exchange layers in different regions, so as to provide a true and reliable data basis for the subsequent design of geothermal refrigeration and heating engineering projects, calculate and analyze the test data of experimental projects, and gradually improve the technical database for the sustainable development and application of medium-deep geothermal energy. Summary of the Invention

[0006] To achieve the above technical objectives, the present invention adopts the following solutions:

[0007] A skid-mounted testing device for the heat exchange capacity of medium-deep geothermal wells injects water with a set temperature and flow rate into the outer wellbore of a coaxial casing type medium-deep geothermal well. The water flows through the geothermal well and exchanges heat with the crust soil, sand, and water quality around the well wall, and flows out of the geothermal well through the inner wellbore of the geothermal well. Through this detection device system workstation, the water volume, temperature, and heat of the geothermal well's inlet and outlet water are compared and analyzed, and logical calculations are performed to calculate the energy difference between the inlet and outlet water of the geothermal well per unit time, so as to determine the heat exchange amount and heat exchange efficiency of the geothermal well.

[0008] A skid-mounted medium-deep geothermal well heat transfer capacity testing device, which is a cold and heat self-supplying integrated assembled skid-mounted structure. Its external dimensions are designed with modular dimensions according to the transportable external dimensions of containers and motor transport vehicles, facilitating transportation and on-site hoisting, disassembly, and assembly. It includes an energy supply unit module, an energy supply hydraulic module, a control center, a heat exchange water tank, a heat exchange hydraulic module, a geothermal well, a lift pump, and quick connectors.

[0009] The energy supply unit module is connected to the energy supply hydraulic module through a quick connector; the energy supply hydraulic module is connected to the heat exchange water tank through a quick connector; the heat exchange water tank is connected to the heat exchange hydraulic module through a quick connector; the heat exchange hydraulic module is connected to the geothermal well through a quick connector.

[0010] The control center is a testing device workstation or a computer remote control system, and is connected to the energy supply module controller and the heat exchange side controller through control signal lines to form a medium-deep geothermal well testing device control system, which is used to analyze, measure, monitor, and calculate the information data transmitted or collected by each module controller.

[0011] The energy supply unit is an air source cold and hot water heat pump unit, which can realize the conversion of refrigeration and heating functions under all climate conditions and provide cold and hot water sources for the geothermal well.

[0012] The energy supply hydraulic module is a skid-mounted integral assembled structure, including: an energy supply side heat meter, a thermometer, a pressure gauge, a pressure sensor, an electromagnetic flowmeter, a check valve, a filter, a regulating valve, an energy supply module controller, an energy supply pump, a water supply pipeline, a return water pipeline, elbows, and flanges.

[0013] The heat exchange water tank is a heat preservation water tank, and an intermediate partition is provided inside the heat preservation water tank to divide the water tank into a water supply tank and a return water tank; vertical flow buffering partitions are provided between the water supply tank and the return water tank to buffer the water flow pressure of the water supply pipeline in the water supply tank and the geothermal return water pipeline, as well as the return water pipeline in the return water tank and the geothermal outlet water pipeline.

[0014] The heat exchange hydraulic module is a skid-mounted integral assembled structure, including: a geothermal side heat meter, a thermometer, an electromagnetic flowmeter, a check valve, a filter, a regulating valve, a pressure gauge, a pressure sensor, a temperature sensor, a geothermal return water pipeline, a geothermal water supply pipeline, elbows, and flanges.

[0015] The geothermal well is a medium-deep coaxial casing type structure, including an inner central pipe and an inner annular outer casing; the inner central pipe is connected to the inner annular outer casing at the bottom of the well; a central pipe water pipeline is connected to the wellhead of the inner central pipe and is communicated with the geothermal outlet water pipeline; a ring pipe water pipeline is connected to the wellhead of the inner annular outer casing and is connected to the geothermal return water pipeline.

[0016] The medium-deep coaxial casing heat exchange well described above is used for heat energy exchange between the external geothermal energy and the internal water circuit of the well;

[0017] The present invention also discloses a method for testing the heat exchange capacity of a medium-deep geothermal well. The heat exchange capacity of the medium-deep geothermal well: Q 计算 = ρ * v * C * ΔT

[0018] In the formula: Q 计算 The calculated heat exchange amount of a geothermal well, kW;

[0019] ρ — The density of water, kg / m³;

[0020] V — The volume flow rate of water, m³ / s;

[0021] C — The specific heat at constant pressure of water, kJ / (kg·°C);

[0022] ΔT — The temperature difference between the inlet and outlet water temperatures of the test device, °C;

[0023] Preferably, both the energy supply hydraulic module and the heat exchange hydraulic module of the test device in this case are equipped with intelligent electromagnetic or ultrasonic heat meters, flow meters, and thermometers for calculating the heat exchange capacity of the geothermal well and detecting leaks in the coaxial casing geothermal well;

[0024] For the skid-mounted medium-deep geothermal well leak detection, the detection method is to set the same flow rate for the energy supply pump and the water extraction pump, and determine whether the geothermal well leaks by comparing the flow rates of the flow meters in the energy supply hydraulic module and the heat exchange hydraulic module:

[0025] F 地热 <F 供能 ,F 地热 <The set flow rate, and when the water level in the return water tank decreases, it proves that the geothermal well leaks;

[0026] F 地热 >F 供能 ,F 地热 >The set flow rate, and when the water level in the water supply tank increases, it proves that the geothermal well leaks;

[0027] In the formula: F 地热 — The flow meter on the geothermal heat exchange side;

[0028] F 供能 — The flow meter on the energy supply side heat exchange side;

[0029] The beneficial effects of the present invention are:

[0030] The energy unit module of the present invention provides a cold and heat source with a set flow rate and constant temperature to simulate the actual operation of the user side. During testing, only one medium-deep heat exchange well needs to be drilled and connected to a well pipe of a medium-deep coaxial casing heat exchange well to form a closed loop, which can accurately display or calculate the heat exchange capacity of the geothermal well, provide timely and effective information and data for the subsequent project function design, and can be used for the leakage quality detection of the coaxial casing geothermal well;

[0031] In the energy supply hydraulic module and the heat exchange hydraulic module of the present invention, intelligent electromagnetic or ultrasonic heat meters, flow meters, thermometers, and pressure gauges are provided, which can record on-site and transmit to the control center in a timely and accurate manner. It can truly simulate the heat exchange capacity of the medium-deep coaxial pipe heat exchange well under the heat absorption mode of the medium-deep coaxial pipe heat exchange system to the soil in winter, and test and calculate the heat absorption of the underground rock and soil.

[0032] The energy supply hydraulic module, heat exchange hydraulic module, and energy storage water tank of the present invention adopt a skid-mounted modular design and can be quickly connected through quick connectors, making installation, disassembly, and transportation convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the system structure and principle of the test device in the embodiment of the present invention;

[0034] In the drawings:

[0035] 1. Energy supply unit module, 2. Quick connector, 3. Control signal line, 4. Energy supply hydraulic module, 5. Control center, 6. Energy conversion water tank, 7. Heat exchange hydraulic module, 8. Coaxial casing geothermal well, 9. Lift pump, 11. Energy supply unit controller, 41. Energy supply side heat meter, 42. Water supply pipeline, 43. Check valve, 44. Filter, 45. Energy supply module controller, 46. Energy supply pump, 47. Return water pipe, 61. Injection valve, 62. Slow flow partition, 63. Water supply tank, 64. Drain valve, 65. Intermediate partition, 66. Return water tank, 71. Control valve, 72. Thermometer, 73. Pressure gauge, 74. Flow meter, 75. Pressure sensor, 76. Temperature sensor, 77. Heat exchange side controller, 78. Geothermal water outlet pipeline, 79. Geothermal water supply pipeline, 81. Inner center pipe, 82. Outer casing; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The present invention will be further described below in conjunction with embodiments. The specific structure and system layout of the present invention are as shown in the drawings. Those skilled in the art can make further technical extensions on the following technical basis to achieve the technical improvement or expansion of the present technical solution. The protection scope of this patent application is limited only by the claims.

[0037] To solve the deficiencies in the prior art, the object of the present invention is to provide a skid-mounted testing device and method for the heat exchange capacity of medium-deep geothermal wells. By artificially simulating and setting up a constant-temperature water storage and supply tank, water enters the medium-deep coaxial casing type geothermal well at a set water temperature and water flow rate, and the water temperature and water volume of the actual water output from the geothermal well are measured. Through the comparison and analysis of the water volume, temperature, and heat of the inlet and outlet water, the energy difference between the inlet and outlet water of the geothermal well per unit time is calculated to determine the heat exchange amount and heat exchange efficiency of the geothermal well.

[0038] To achieve the above technical objectives, the present invention adopts the following solutions:

[0039] A skid-mounted testing device and method for the heat exchange capacity of medium-deep geothermal wells, by artificially setting or simulating a set of modular and integrally skid-mounted detection devices for medium-deep geothermal wells and providing a simulated user-side water source with a certain set temperature and flow rate for the geothermal well; injecting water with a certain set temperature and flow rate into the outer wellbore of the medium-deep coaxial casing type geothermal well, the water flows through the geothermal well and exchanges heat with the crust soil, sand, and water quality around the well wall, and flows out of the geothermal well through the inner wellbore of the geothermal well. Through the detection device system workstation, the water volume, temperature, and heat of the inlet and outlet water of the geothermal well are compared and analyzed, and logically calculated, and the energy difference between the inlet and outlet water of the geothermal well per unit time is calculated to determine the heat exchange amount and heat exchange efficiency of the geothermal well.

[0040] Example 1:

[0041] A skid-mounted testing device for the heat exchange capacity of medium-deep geothermal wells. This detection device is a cold and heat self-supplying integrated assembled skid-mounted structure, and its external dimensions are designed in modular dimensions according to the transportable external dimensions of containers and motor vehicles, which is convenient for transportation and on-site hoisting, disassembly, and assembly. In this example, for the convenience of transportation, the width dimension of the external shape of the testing device is set to ≤2400mm, and the height dimension is less than 2500mm for easy transportation.

[0042] Its internal structure includes: energy supply unit module 1, quick-connect joint 2, energy supply hydraulic module 4, control center 5, heat exchange water tank 6, heat exchange hydraulic module 7, geothermal well 8, lift pump 9 and other valve pipeline connection components; as Figure 1 shown, the energy supply unit module 1 is connected to the energy supply hydraulic module 4 through the quick-connect joint 2; the energy supply hydraulic module 4 is connected to the heat exchange water tank 6 through the quick-connect joint 2; the heat exchange water tank 6 is connected to the heat exchange hydraulic module 7 through the quick-connect joint 2; the heat exchange hydraulic module 7 is connected to the geothermal well 8 through the quick-connect joint 2; the lift pump 9 is suspended in the inner central pipe 81 of the geothermal well 8; the lift pump 9 is a multi-stage submersible pump and is controlled by frequency conversion, and is arranged at the bottom of the inner central pipe 81 for pumping water from the inside to the outside of the geothermal well 8. The flow rate of the submersible pump 9 and the energy supply pump 46 should be 10 - 40m 3 / h; the head should be 15 - 130m.

[0043] The control center 5 is a remote control system of a host computer such as a test device workstation or a computer. In this embodiment, the control center uses a test device workstation and is connected to the energy supply unit controller 11, the energy supply module controller 45, and the heat exchange side controller 77 through the control signal line 3 to form a medium-deep geothermal well test device control system, which is used to analyze, measure, monitor, and calculate the information data transmitted or collected by each module controller.

[0044] The energy supply unit module 1 is an air source cold and hot water heat pump unit, which can realize the conversion of refrigeration and heating functions under all climate environmental conditions and provide cold and hot water sources for the geothermal well.

[0045] The energy supply hydraulic module 4 is a skid-mounted integral assembly structure, including: a water supply pipe 42 and a return water pipe 47 are arranged inside to connect the energy supply unit module 1 and the energy conversion water tank 6; an energy supply side heat meter 41, as well as elbows, flanges and other connecting parts such as a regulating valve 71, a thermometer 72, a pressure gauge 73, an electromagnetic flowmeter 74, a pressure sensor 75, and a temperature sensor 76 are arranged on the water supply pipe 42. A check valve 43, a filter 44, an energy supply module controller 45, and an energy supply pump 46 are arranged on the return water pipe 47. The energy supply pump 46 is a canned motor pipe pump and adopts frequency conversion control.

[0046] The heat exchange water tank 6 is a heat preservation water tank. The preferred size of the heat exchange water tank 6 is that the height is below 1500 mm, and the volume is preferably 4 - 10 m 3 . The intermediate partition 65 horizontally arranged in the middle of the water tank divides the water tank into a water supply tank 63 and a return water tank 66; a vertical flow buffering partition 62 is arranged in the middle of the water supply tank 63 and the return water tank 66, and the vertical flow buffering partition 62 is used to buffer the water flow pressure difference between the water supply pipe 42 in the water supply tank 63 and the geothermal water supply pipe 79; the vertical flow buffering partition 62 is also used to buffer the water flow pressure difference between the return water pipe 47 in the return water tank 66 and the geothermal water outlet pipe 78. Further, the upper end of the intermediate partition 65 in the heat exchange water tank 6 is lower than the height of the heat exchange water tank 6, and the dimension difference is preferably 100 - 150 mm, and its left, right, and bottom sides are firmly welded to the left side plate, the right side plate, and the bottom plate of the heat exchange water tank 6; this structure is convenient for adjusting the water level height between the water supply tank 63 and the return water tank 66; furthermore, the upper end of the vertical flow buffering partition 62 arranged in the heat exchange water tank 6 is lower than the upper end face of the intermediate partition 65, and the height difference is preferably 100 - 150 mm; the gap between its lower end and the water tank bottom plate is preferably 100 - 150 mm; the left and right ends are firmly welded to the front side plate of the water tank 6 and the intermediate partition 65.

[0047] The described heat exchange hydraulic module 7 adopts a skid-mounted integral assembly structure, which includes two pipelines, namely, the geothermal water outlet pipeline 78 and the geothermal water supply pipeline 79. The connection between the heat exchange hydraulic module 7 and the geothermal well 8 and the heat exchange water tank 6 is realized through the geothermal water outlet pipeline 78 and the geothermal water supply pipeline 79; a regulating valve 71, a thermometer 72, a pressure gauge 73, an electromagnetic flowmeter 74, a pressure sensor 75, a temperature sensor 76, and a heat exchange side controller 77 are arranged on the geothermal water outlet pipeline 78; connection components such as a heat exchange side heat energy meter 41, a check valve 43, a filter 44, an elbow, and a flange are arranged on the geothermal water supply pipeline 79.

[0048] The described geothermal well 8 is a medium-deep coaxial casing heat exchange well, which includes an inner central pipe 81 and an outer casing 82 with an inner annular structure; the inner central pipe 81 and the outer casing 82 are connected at the bottom of the well; the wellhead of the central pipe 81 is connected to the geothermal water outlet pipeline 78; a ring-shaped pipe water pipeline is connected to the wellhead of the outer casing 82 in the well and is connected to the geothermal water supply pipeline 79. The above-mentioned medium-deep coaxial casing heat exchange well is used for heat energy exchange between the geothermal energy outside the well and the water path inside the inner and outer casings 82 of the well.

[0049] Preferably, the refrigerating capacity of the energy supply unit module 1 is a modular combination of unit modular units with refrigerating capacities of 16 - 18KW, 32 - 35KW, 65 - 70KW, and 130 - 140KW. The heating capacity is a modular combination of unit modular units with heating capacities of 18 - 20KW, 35 - 40KW, 70 - 80KW, and 150 - 160KW. The compressor in the energy supply unit module 1 is a DC variable frequency scroll compressor, the condenser is a shell and tube or plate heat exchanger, the evaporator is a finned heat exchanger, and the condensing fan is a variable frequency fan.

[0050] Preferably, the above-mentioned energy supply unit controller 11, energy supply module controller 45, and heat exchange side controller 77 are multi-functional controllers with PLC programming, RS485 communication protocol interface function, and a liquid crystal display control panel; the energy supply unit controller 11, energy supply module controller 45, and heat exchange side controller 77 are all multi-functional controllers with PLC programming, RS485 communication protocol interface function, and a liquid crystal display control panel.

[0051] The above-mentioned energy supply side heat energy meter 41, thermometer 72, pressure gauge 73, electromagnetic flowmeter 74, pressure sensor 75, and temperature sensor 76 have the function of remote data transmission; the energy supply module controller 45 receives, processes, analyzes, and monitors the information data transmitted by components such as the energy supply side heat energy meter 41, energy supply pump 46, thermometer 72, pressure gauge 73, electromagnetic flowmeter 74, pressure sensor 75, and temperature sensor 76, and processes, logically calculates, controls, and remotely transmits the information data to the control center 5.

[0052] The above-mentioned heat exchange module controller 77 receives, processes, analyzes, and monitors the information data transmitted by components such as the lift pump 9, the heat energy meter 41 on the heat exchange side, the energy supply pump 46, the thermometer 72, the pressure gauge 73, the electromagnetic flowmeter 74, the pressure sensor 75, and the temperature sensor 76, and processes, performs logical calculations, controls, and remotely transmits it to the control center 5.

[0053] The above-mentioned energy supply module controller 45 receives, processes, analyzes, and monitors the information data transmitted by components such as the lift pump 9, the heat energy meter 41 on the heat exchange side, the energy supply pump 46, the thermometer 72, the pressure gauge 73, the electromagnetic flowmeter 74, the pressure sensor 75, and the temperature sensor 76, and processes, performs logical calculations, and remotely transmits it to the control center 5. To meet the basic capabilities of the equipment, the flow rates of the submersible pump 9 and the energy supply pump 46 should be 10 - 40 m 3 / h; the head should be 15 - 130 m.

[0054] Embodiment 2:

[0055] The present invention also discloses a method for testing the heat exchange capacity of a medium-deep geothermal well. The testing method uses the above-mentioned skid-mounted testing device for the heat exchange capacity of a medium-deep geothermal well. The theoretical principle of the method is:

[0056] Heat exchange capacity of medium-deep geothermal well: Q 计算 = ρ * v * C * ΔT

[0057] In the formula: Q 计算 - Calculated heat exchange amount of a geothermal well, kW;

[0058] ρ - Density of water, kg / m;

[0059] V - Volume flow rate of water, m' / s;

[0060] C - Specific heat at constant pressure of water, kJ / (kg x °C);

[0061] ΔT - Temperature difference between the inlet and outlet water temperatures of the testing device, °C;

[0062] This case takes the heat exchange capacity testing project of a medium-deep geothermal well in Baishishan Town, Jiaohe City, Jilin Province as an example to verify the feasibility of this method;

[0063] Project overview: The completion time of the project well is January 16, 2025, and the well depth is 1000 meters; the structural form of the heat exchange well is a coaxial casing structure; the outer well wall diameter of the heat exchange well is DN200, the bottom is closed, and there is a closed cylindrical barrel structure with a water inlet and a water outlet reserved at the upper end. Its upper water inlet is connected to the geothermal water outlet pipe 78 of this testing device; the inner well is a DN40 adiabatic pipe and is set at the center of the axis of the outer well, and the bottom is connected to the submersible pump; the bottom of the inner well is connected to the submersible pump set at the bottom of the outer well, and its upper end is connected to the geothermal water supply pipe 79 of this testing device through the water outlet;

[0064] The test time is from March 21st, 2025 to March 26th, 2025

[0065]

[0066] According to the above data, the error between the measured heat exchange capacity of the actual case and the theoretical calculation amount is between 2% and 4%. This solution is feasible;

[0067] Example 3:

[0068] In the energy supply hydraulic module 1 and the heat exchange hydraulic module 4 of this skid-mounted medium-deep geothermal well heat exchange capacity test device, intelligent electromagnetic or ultrasonic heat meters 41, flow meters 74, and pressure sensors 75 are all installed, and it can also be used for leakage detection of the coaxial casing geothermal well 8.

[0069] The detection method is: set the same flow rate for the energy supply pump 46 and the water lifting pump 9, and determine whether the geothermal well leaks by comparing the flow rates of the energy supply hydraulic module flow meter and the heat exchange hydraulic module flow meter:

[0070] F 地热 <F 供能 ,F 地热 < When the set flow rate, and the water level in the return water tank 66 decreases, it proves that the geothermal well leaks;

[0071] F 地热 >F 供能 ,F 地热 > When the set flow rate, and the water level in the water supply tank 63 increases, it proves that the geothermal well leaks;

[0072] In the formula: F 地热 - A geothermal heat exchange side flow meter;

[0073] F 供能 - An energy supply side heat exchange side flow meter;

[0074] This case takes the medium-deep geothermal well heat exchange capacity test project in Baishishan Town, Jiaohe City, Jilin Province as an example to verify the feasibility of this method;

[0075] The project overview is the same as above;

[0076] The test time is from March 21st, 2025 to March 26th, 2025

[0077]

[0078] The beneficial effects of the present invention are as follows: The energy unit module provides cold and heat sources with a set flow rate and constant temperature to simulate the actual operation conditions on the user side, can accurately display or calculate the heat exchange capacity of the geothermal well, and test and calculate the heat absorption amount and heat exchange efficiency of the underground rock and soil, providing timely and effective information and data for the functional design of subsequent projects.

[0079] The present invention is provided with flow meters on the geothermal and energy supply sides, and level gauges are arranged in the water supply tank and the water return tank of the energy conversion water tank. By comparing and analyzing the flow meters on the geothermal and energy supply sides with the set water pump flow rate, and with the help of the liquid level pressure difference between the supply and return water tanks, it can be used for the leakage quality detection of coaxial casing geothermal wells, with simple method and convenient operation.

Claims

1. A skid-mounted test device for the heat exchange capacity of medium-deep geothermal wells, characterized in that: Including: An energy supply unit module, an energy supply hydraulic module, a control center, a heat exchange water tank, a hot water exchange hydraulic module, a geothermal well, and a lift pump; The energy supply unit module is connected to the energy supply hydraulic module; the energy supply hydraulic module is connected to the heat exchange water tank; the heat exchange water tank is connected to the hot water exchange hydraulic module; the hot water exchange hydraulic module is connected to the geothermal well; The control center is connected to an energy supply module controller and a heat exchange side controller through control signal lines to form a control system for a medium-deep geothermal well test device; Inside the energy supply hydraulic module, a water supply pipeline and a return water pipeline are provided to connect the energy supply unit module and the heat exchange water tank; on the water supply pipeline, there are an energy supply side heat meter, a regulating valve, a thermometer, a pressure gauge, an electromagnetic flowmeter, a pressure sensor, and a temperature sensor; on the return water pipeline, there are a check valve, a filter, an energy supply module controller, and an energy supply pump; Inside the hot water exchange hydraulic module, a geothermal water outlet pipeline and a geothermal water supply pipeline are provided to connect the hot water exchange hydraulic module with the geothermal well and the heat exchange water tank through the geothermal water outlet pipeline and the geothermal water supply pipeline; on the geothermal water outlet pipeline, there are a regulating valve, a thermometer, a pressure gauge, an electromagnetic flowmeter, a pressure sensor, a temperature sensor, and a heat exchange side controller; on the geothermal water supply pipeline, there are a heat exchange side heat meter, a check valve, and a filter; The heat exchange module controller receives, processes, analyzes, and monitors the information data transmitted by the lift pump, the heat exchange side heat meter, the energy supply pump, the thermometer, the pressure gauge, the electromagnetic flowmeter, the pressure sensor, and the temperature sensor, and performs processing, logical calculation, control, and remote transmission to the control center; the energy supply unit is an air source cold and hot water heat pump unit.

2. The skid-mounted medium-deep geothermal well heat transfer capacity testing device according to claim 1, characterized in that: The heat exchange water tank is a heat preservation water tank, and an intermediate partition plate horizontally arranged in the middle of the water tank divides the water tank into a water supply tank and a return water tank; vertical flow buffering partitions are provided in both the water supply tank and the return water tank to buffer the water flow pressure difference in the water supply tank and the water flow pressure difference in the return water tank.

3. The skid-mounted medium-deep geothermal well heat transfer capacity test device according to claim 2, characterized in that: The geothermal well is a medium-deep coaxial casing heat exchange well, including an inner central pipe and an outer casing with an inner annular structure; the inner central pipe is connected to the outer casing at the bottom of the well; the wellhead of the inner central pipe is connected to the geothermal water outlet pipeline; the wellhead of the outer casing is connected to the geothermal water supply pipeline.

4. The skid-mounted medium-deep geothermal well heat transfer capacity testing device according to claim 1, wherein: The cooling capacity of the energy supply unit module is a modular combination of unit modular units with cooling capacities of 16 - 18KW, 32 - 35KW, 65 - 70KW, and 130 - 140KW; the heating capacity is a modular combination of unit modular units with heating capacities of 18 - 20KW, 35 - 40KW, 70 - 80KW, and 150 - 160KW.

5. The skid-mounted medium-deep geothermal well heat transfer capacity testing device according to claim 1, characterized in that: The energy supply side heat meter, thermometer, pressure gauge, electromagnetic flowmeter, pressure sensor, and temperature sensor have the function of remote transmission of data information.

6. The skid-mounted medium-deep geothermal well heat exchange capacity testing device according to claim 1, characterized in that: The energy supply module controller receives, processes, analyzes, and monitors the information data transmitted by the energy supply side heat meter, the energy supply pump, the thermometer, the pressure gauge, the electromagnetic flowmeter, the pressure sensor, and the temperature sensor, and performs processing, logical calculation, control, and remote transmission to the control center.

7. A method for testing the heat exchange capacity of a medium-deep geothermal well, using the skid-mounted medium-deep geothermal well heat exchange capacity testing device described in claim 1 above, characterized in that: The following calculation method is adopted: Heat exchange capacity of medium-deep geothermal well: Q 计算 = ρ * v * C * ΔT Where: Q 计算 The calculated heat exchange amount of a geothermal well, unit: kW; p - the density of water, unit: kg / m; V - the volume flow rate of water, unit: m' / s; C - the specific heat at constant pressure of water, unit: kJ / (kgx℃); ΔT - the temperature difference between the inlet and outlet water temperatures of the testing device, unit: ℃.

8. A method for testing the heat exchange capacity of a medium-deep geothermal well according to claim 7, characterized in that: Both the energy supply hydraulic module and the heat exchange hydraulic module of the testing device in this case are equipped with intelligent electromagnetic or ultrasonic heat meters, flow meters, and thermometers, which are used for calculating the heat exchange capacity of the geothermal well and detecting the leakage of the coaxial casing geothermal well; The detection method is to set the same flow rate for the energy supply pump and the water extraction pump, and determine whether the geothermal well leaks by comparing the flow rates of the energy supply hydraulic module flow meter and the heat exchange hydraulic module flow meter: F 地热 <F 供能 ,F 地热 When the set flow rate is less than and the water level in the return water tank decreases, it proves that the geothermal well is leaking; F 地热 > F 供能 , F 地热 When it is greater than the set flow rate and the water level in the water supply tank increases, it proves that the geothermal well is leaking; where: F 地热 a geothermal heat exchange side flowmeter; F 供能 A flowmeter for the heat exchange side on the energy supply side.

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