Geothermal well testing device and geothermal well testing method

Abstract

The invention relates to the technical field of geothermal utilization, and discloses a geothermal well testing device and a geothermal well testing method.The geothermal well testing device comprises a mounting base, a water sampling mechanism, a detection mechanism and a control mechanism, and the water sampling mechanism, the detection mechanism and the control mechanism are mounted on the mounting base; the water collection mechanism and the detection mechanism are connected with the control mechanism, the water collection mechanism is used for collecting geothermal water in a geothermal well, the detection mechanism is used for collecting a first state parameter of the geothermal water and sending the first state parameter to the control mechanism, and the control mechanism is configured to control the collection flow of the geothermal water by the water collection mechanism according to the first state parameter; wherein the first state parameters comprise the liquid level height of the geothermal water, the current temperature, the current extraction pressure and the current extraction flow. The geothermal well testing device is high in integration level, small in occupied area and convenient to transport.

Description

Technical Field

[0001] This application relates to the technical field of geothermal energy utilization, and particularly relates to a geothermal well testing device and a geothermal well testing method. Background Art

[0002] Geothermal resources are a renewable energy source with strong stability and reliability, large reserves, wide distribution, and environmental friendliness, and have broad application and development prospects. Since it is necessary to obtain an exploration right or a mining right in the early stage of geothermal resource development, it is necessary to obtain the water extraction and reinjection capabilities after the completion of the geothermal well in the early stage, so as to provide relevant basis for the later development of geothermal resources.

[0003] At present, for the data collection of the water extraction or reinjection test of a geothermal well, it is generally necessary to simply install a flow meter at the wellhead and install devices such as a pressure gauge and a thermometer on the temporary pipeline. At the same time, large equipment such as a pump truck is also required to adjust and control various parameters of the water extraction or reinjection.

[0004] In the geothermal well test device in the related art, various components need to be installed temporarily, with high labor costs and large floor areas, which is not conducive to transportation. Summary of the Invention

[0005] In view of this, this application provides a geothermal well testing device and a geothermal well testing method, which have high integration, small floor area, and are convenient for transportation.

[0006] Specifically, the embodiments of this application include the following technical solutions:

[0007] In a first aspect of the embodiments of this application, a geothermal well testing device is provided. The geothermal well testing device includes: a mounting base, and a water extraction mechanism, a detection mechanism, and a control mechanism mounted on the mounting base;

[0008] The water extraction mechanism and the detection mechanism are respectively connected to the control mechanism. The water extraction mechanism is used to extract geothermal water from the geothermal well. The detection mechanism is used to collect the first state parameters of the geothermal water and send them to the control mechanism. The control mechanism is configured to control the extraction flow rate of the geothermal water by the water extraction mechanism according to the first state parameters, where the first state parameters include the liquid level height, current temperature, current extraction pressure, and current extraction flow rate of the geothermal water.

[0009] Optionally, the detection mechanism includes a liquid level monitoring unit. The liquid level monitoring unit is communicated with the geothermal well, and is configured to emit sound waves into the geothermal water in the geothermal well, receive the sound waves reflected by the liquid level of the geothermal water, and determine the liquid level height of the geothermal water in the geothermal well according to the time difference between the emitted sound waves and the received reflected sound waves.

[0010] Optionally, the geothermal well testing device includes a testing gate valve and a first stop valve. The testing gate valve is used to connect the geothermal well and the liquid level monitoring unit;

[0011] The first stop valve is located between the liquid level monitoring unit and the testing gate valve, and is controllably used to conduct or cut off the pipeline between the geothermal well and the liquid level monitoring unit.

[0012] Optionally, the geothermal well testing device further includes a reinjection mechanism. The reinjection mechanism is respectively connected to the water outlet end of the water extraction mechanism and the reinjection well, and is used to reinject the geothermal water into the reinjection well;

[0013] Wherein, the reinjection mechanism is respectively connected to the detection mechanism and the control mechanism. The control mechanism is configured to control the reinjection flow rate of the reinjection well by the reinjection mechanism according to the second state parameter sent by the detection mechanism. The second state parameter includes the current reinjection pressure and the current reinjection flow rate.

[0014] Optionally, the detection mechanism includes a temperature sensor, a first pressure transmitter, a flow meter, and a second pressure transmitter sequentially arranged from the water extraction end to the water outlet end of the water extraction mechanism.

[0015] Optionally, the geothermal well testing device includes a second stop valve and a third stop valve;

[0016] The second stop valve is located between the flow meter and the first pressure transmitter, and the third stop valve is located between the water outlet end of the water extraction mechanism and the second pressure transmitter.

[0017] Optionally, the geothermal well testing device includes a first pump body and a second pump body;

[0018] The first pump body is connected to the water extraction mechanism, the second pump body is connected to the reinjection mechanism, the first pump body and the second pump body are respectively connected to the detection mechanism, and the detection mechanism is configured to control the frequency of the first pump body according to the first state parameter and control the frequency of the second pump body according to the second state parameter.

[0019] Optionally, the geothermal well testing device further includes a water storage mechanism. The water storage mechanism is respectively connected to the water outlet end of the water extraction mechanism and the water inlet end of the reinjection mechanism, and is used to store the geothermal water extracted by the water extraction mechanism.

[0020] In the second aspect of the embodiments of the present application, a geothermal well testing method is provided, which is applied to the above geothermal well testing device. The testing method includes:

[0021] Obtain the first state parameter;

[0022] Determine the target extraction flow rate and the target temperature according to the first state parameter;

[0023] In response to the current extraction flow rate not meeting the target extraction flow rate, or the current temperature not meeting the target temperature, control the extraction flow rate of the water extraction mechanism based on the target extraction flow rate and the target temperature.

[0024] Optionally, the geothermal well testing device further includes a reinjection mechanism for reinjecting the extracted geothermal water into the reinjection well;

[0025] Wherein, the reinjection mechanism is respectively connected to the detection mechanism and the control mechanism, and the control mechanism is configured to control the reinjection flow rate of the reinjection well by the reinjection mechanism according to the second state parameter sent by the detection mechanism, and the second state parameter includes the current reinjection pressure and the current reinjection flow rate;

[0026] The testing method further includes:

[0027] Obtain the second state parameter;

[0028] Determine the target reinjection flow rate and the target reinjection pressure according to the second state parameter;

[0029] In response to the current reinjection flow rate not meeting the target reinjection flow rate, or the current reinjection pressure not meeting the target reinjection pressure, control the reinjection flow rate of the reinjection mechanism based on the target reinjection flow rate and the target reinjection pressure.

[0030] The beneficial effects of the technical solution provided by the embodiments of the present application at least include:

[0031] The geothermal well testing device provided by the embodiments of the present application integrates the water extraction mechanism, the detection mechanism for data acquisition, and the control mechanism required in the geothermal well water extraction test onto the same mounting base, occupying a small area and being convenient for transportation; moreover, various mechanisms do not need to be temporarily installed during use, reducing labor costs and improving on-site safety; in addition, through real-time data acquisition and control of the testing device, the water extraction test of the geothermal well can be accurately realized, ensuring the measurement accuracy while reducing the workload of the operator. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1The structural schematic diagram of the geothermal well testing device provided by the embodiment of the present application is shown;

[0034] Figure 2 The flowchart of a geothermal well testing method provided by the embodiment of the present application is shown;

[0035] Figure 3 The flowchart of another geothermal well testing method provided by the embodiment of the present application is shown.

[0036] Reference numerals:

[0037] 1. Mounting base;

[0038] 2. Water extraction mechanism;

[0039] 3. Detection mechanism; 31. Liquid level monitoring unit; 32. Temperature sensor; 33. First pressure transmitter; 34. Flowmeter; 35. Second pressure transmitter;

[0040] 4. Control mechanism;

[0041] 5. First stop valve;

[0042] 6. Recharge mechanism; 61. Second pump body;

[0043] 7. Second stop valve;

[0044] 8. Third stop valve.

[0045] Through the above-mentioned drawings, the specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0046] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application. To make the technical solutions and advantages of the present application clearer, the geothermal well testing device and geothermal well testing method, etc. will be described in detail below in conjunction with the drawings.

[0047] Geothermal resources are a renewable energy source with strong stability and reliability, large reserves, wide distribution, and clean environmental protection, and have broad application and development prospects. Since it is necessary to obtain the prospecting right or mining right in the early stage of geothermal resource development, it is necessary to obtain the water extraction and recharge capabilities after the completion of the geothermal well in the early stage, so as to provide relevant basis for the later development of geothermal resources.

[0048] At present, for the data acquisition of the water extraction or reinjection test of a geothermal well, it is generally necessary to simply install a flowmeter at the wellhead and install devices such as a pressure gauge and a thermometer on the temporary pipeline. At the same time, large equipment such as a pump truck is also required to adjust and control various parameters of the water extraction or reinjection.

[0049] In the geothermal well test device in the related art, various components need to be installed temporarily, resulting in a relatively high labor cost and a large floor area, which is not conducive to transportation.

[0050] In view of this, the embodiment of the present application provides a geothermal well test device. As Figure 1 shown, the geothermal well test device may include: a mounting base 1, a water extraction mechanism 2, a detection mechanism 3, and a control mechanism 4 mounted on the mounting base 1; the water extraction mechanism 2 and the detection mechanism 3 are respectively connected to the control mechanism 4. The water extraction mechanism 2 is used to extract the geothermal water in the geothermal well, and the detection mechanism 3 is used to collect the first state parameters of the geothermal water and send them to the control mechanism 4. The control mechanism 4 is configured to control the extraction flow rate of the geothermal water by the water extraction mechanism 2 according to the first state parameters, where the first state parameters include the liquid level height, the current temperature, the current extraction pressure, and the current extraction flow rate of the geothermal water.

[0051] The geothermal well test device provided by the embodiment of the present application integrates the water extraction mechanism 2, the detection mechanism 3 for data acquisition, and the control mechanism 4 required in the geothermal well water extraction test onto the same mounting base 1, with a relatively small floor area and being convenient for transportation; moreover, various mechanisms do not need to be installed temporarily, reducing the labor cost and improving the on-site safety; in addition, through the real-time acquisition of data and the control of the test device, the water extraction test of the geothermal well can be accurately realized, ensuring the measurement accuracy while reducing the workload of the operator.

[0052] Optionally, the water extraction mechanism 2 includes a high-pressure hose, which is connected to the geothermal well and pumps the geothermal water in the geothermal well to the outside.

[0053] Optionally, the control mechanism 4 includes a control cabinet with computing and control functions. The control cabinet is respectively connected to the detection mechanism 3 and the water extraction mechanism 2, performs operations according to the received first state parameters, and controls the current extraction flow rate of the water extraction mechanism 2 according to the result obtained after the operation, so as to test the water extraction capacity of the production well when meeting the target extraction flow rate and the target temperature.

[0054] In some embodiments of the present application, as Figure 1 shown, the detection mechanism 3 may include a liquid level monitoring unit 31. The liquid level monitoring unit 31 is communicated with the geothermal well, and is configured to emit sound waves into the geothermal water in the geothermal well, receive the sound waves reflected by the liquid level of the geothermal water, and determine the liquid level height of the geothermal water in the geothermal well according to the time difference between the emitted sound waves and the received reflected sound waves.

[0055] In the geothermal well testing device provided by the embodiments of the present application, the liquid level monitoring unit 31 determines the liquid level height of the geothermal water in the geothermal well by using the sound waves emitted by itself and the received reflected sound waves. Compared with the existing liquid level detectors, there is no need to directly place the sensor or device into the water, avoiding the risks of pollution, corrosion or damage that may be brought by contact with water. This helps to protect the equipment and extend its service life. Moreover, the liquid level monitoring unit 31 measures the liquid level height through sound waves, without the need to insert a sensor or device into the water. Only by connecting the liquid level monitoring unit 31 on the ground can the liquid level height be measured in real time, which also reduces the operation difficulty of the operator and the workload of the operator. In addition, the liquid level monitoring unit 31 provided by the embodiments of the present application is not affected by the characteristics of the liquid (for example, the chemical properties or temperature changes of the liquid), and can provide more reliable and stable measurement data through the sound wave measurement method. Finally, the sound wave technology can achieve real-time monitoring, which helps to detect abnormal situations or changes in time and take necessary measures in time.

[0056] In some embodiments of the present application, the geothermal well testing device may include a test gate and a first stop valve 5. The test gate is used to connect the geothermal well and the liquid level monitoring unit 31; the first stop valve 5 is located between the liquid level monitoring unit 31 and the test gate, and can be controllably used to conduct or cut off the pipeline between the geothermal well and the liquid level monitoring unit 31.

[0057] In the geothermal well testing device provided by the embodiments of the present application, a first stop valve 5 may also be provided between the liquid level monitoring unit 31 and the test gate (not shown in the figure) of the geothermal well, which is used to conduct or cut off the pipeline between the two, and can prevent the geothermal water from flowing to the liquid level monitoring unit 31 through the pipeline between the test gate and the liquid level monitoring unit 31 during the geothermal well water extraction test, ensuring that the devices inside it will not be damaged due to the impact or immersion of water, nor will the monitoring results be inaccurate due to the accumulation of liquid in the pipeline.

[0058] Furthermore, the first stop valve 5 can isolate the connection between the liquid level monitoring unit 31 and the geothermal well test gate when needed. This isolation function enables independent operation or maintenance of the liquid level monitoring unit 31 and the geothermal well test gate during the geothermal well testing or maintenance without mutual interference; and when it is necessary to maintain or repair the geothermal well test gate, the first stop valve 5 can be closed to prevent the accidental leakage of liquid or pressure to the liquid level monitoring unit 31, thereby reducing the potential risks during the system operation process.

[0059] In some embodiments of the present application, such as Figure 1As shown in the figure, the geothermal well testing device may further include a reinjection mechanism 6. The reinjection mechanism 6 is respectively connected to the water outlet end of the water extraction mechanism 2 and the reinjection well, and is used to reinject the geothermal water into the reinjection well. Among them, the reinjection mechanism 6 is respectively connected to the detection mechanism 3 and the control mechanism 4. The control mechanism 4 is configured to control the reinjection flow rate of the reinjection mechanism 6 to the reinjection well according to the second state parameters sent by the detection mechanism 3. The second state parameters include the current reinjection pressure and the current reinjection flow rate.

[0060] Based on the devices required for the water extraction test, the geothermal well testing device provided by the embodiment of the present application is additionally provided with a reinjection mechanism 6, and integrates various data acquisition and control devices under the two working conditions of geothermal well water extraction and reinjection tests onto the same mounting base 1. Furthermore, it can simultaneously meet the requirements of both the water extraction test and the reinjection test. One device can achieve two functions, and it has a small footprint and is convenient for transportation.

[0061] Optionally, the geothermal well testing device provided by the embodiment of the present application can be used for the water extraction test or the reinjection test alone, or the water extraction and reinjection tests can be carried out synchronously.

[0062] In some embodiments, the water inlet end of the water extraction mechanism 2 is connected to the geothermal well, the water outlet end of the water extraction mechanism 2 is connected to the reinjection mechanism 6, and the water outlet end of the reinjection mechanism 6 is connected to the reinjection well. The water extraction mechanism 2 extracts geothermal water, and conducts the water extraction test through the detection mechanism 3 and the control mechanism 4. The extracted geothermal water directly enters the reinjection well through the reinjection mechanism 6, and at the same time, the reinjection test is conducted through the detection mechanism 3 and the control mechanism 4 to realize the data acquisition of the water extraction and reinjection tests and the tests of the water extraction capacity and the reinjection capacity.

[0063] In some embodiments, the reinjection well can be the same well as the water extraction well connected to the water extraction mechanism 2, and the water extraction test and the reinjection test are simultaneously carried out for the same geothermal well to test the water extraction capacity and the reinjection capacity of the geothermal well.

[0064] Optionally, the reinjection mechanism includes a reinjection pump and a high-pressure hose. The reinjection pump is used to extract water from an external tanker or other water storage devices and reinject it into the reinjection well through the high-pressure hose; or the reinjection pump can also be connected to the water extraction mechanism to transport the water extracted by the water extraction mechanism to the reinjection well.

[0065] In some embodiments of the present application, as Figure 1 shown, the detection mechanism 3 may include a temperature sensor 32, a first pressure transmitter 33, a flow meter 34, and a second pressure transmitter 35 sequentially arranged from the water extraction end to the water outlet end of the water extraction mechanism 2.

[0066] In the geothermal well testing device provided by the embodiments of the present application, the temperature sensor 32 is used to detect the temperature of the produced geothermal water, the flowmeter 34 is used to detect the flow rate of the geothermal water, and a pressure testing instrument is provided at both ends of the flowmeter 34, so that the pressure values of the geothermal water on both sides of the flowmeter can be obtained. By observing the changes in the pressure values on both sides of the flowmeter 34, the flow condition of the geothermal water in the pipeline can be judged. If there is an abnormal pressure change, there may be pipeline blockage, valve damage or other special conditions in the geothermal well testing device and the geothermal well, so that problems can be discovered and solved in time, which helps to quickly locate and solve the faults in the system operation, thereby reducing the safety risks caused by abnormal pressure.

[0067] In some embodiments, the current production pressure can be equal to the average value of the pressures measured by the first pressure transmitter 33 and the second pressure transmitter 35. Due to various factors of the environment and equipment, a single pressure detection instrument may be interfered or have some errors, but taking the average value can offset some instantaneous interferences, making the measurement result more stable; and if one of the pressure detection instruments fails or is damaged, the other pressure detection instrument can still provide data, increasing the fault tolerance of the system and helping to prevent inaccurate data caused by the failure of a single pressure testing instrument.

[0068] In some embodiments of the present application, as Figure 1 shown, the geothermal well testing device may include a second stop valve 7 and a third stop valve 8; the second stop valve 7 is located between the flowmeter 34 and the first pressure transmitter 33, and the third stop valve 8 is located between the water outlet end of the water extraction mechanism 2 and the second pressure transmitter 35.

[0069] In the geothermal well testing device provided by the embodiments of the present application, a second stop valve 7 and a third stop valve 8 may also be provided on both sides of the flowmeter 34. By observing the pressure changes on both sides of the flowmeter 34, the flow condition of the fluid in the system can be judged. When an abnormal pressure change occurs, the first stop valve 5 and the second stop valve 7 can be closed to reduce or stop the flow of the fluid through the flowmeter 34, so that the maintenance work of the flowmeter 34 can be carried out more easily and safely without closing the entire system. In case of emergency, such as system failure or leakage, closing the first stop valve 5 and the second stop valve 7 can prevent more liquid leakage or damage to key components, which helps to protect the equipment and ensure the safety of the operator.

[0070] In some embodiments of the present application, the geothermal well testing device includes a first pump body and a second pump body 61; the first pump body is connected to the water extraction mechanism 2, the second pump body 61 is connected to the reinjection mechanism 6, the first pump body and the second pump body 61 are respectively connected to the detection mechanism 3, and the detection mechanism 3 is configured to control the frequency of the first pump body according to the first state parameter and control the frequency of the second pump body 61 according to the second state parameter.

[0071] In the geothermal well testing device provided by the embodiments of the present application, by setting a first pump body (not shown in the figure) and a second pump body 61, the water extraction flow rate and the reinjection flow rate can be adjusted during the water extraction test and / or the reinjection test, so as to test the water extraction capacity and the reinjection capacity of the geothermal well at the test site.

[0072] Optionally, the first pump body is a submersible geothermal well pump, and the second pump body 61 is a reinjection pump.

[0073] In some embodiments of the present application, the geothermal well testing device further includes a water storage mechanism, which is respectively connected to the water outlet end of the water extraction mechanism 2 and the water inlet end of the reinjection mechanism 6, and is used to store the geothermal water extracted by the water extraction mechanism 2.

[0074] In the geothermal well testing device provided by the embodiments of the present application, a water storage mechanism is additionally provided. The water storage mechanism can temporarily store the geothermal water extracted during the water extraction test, or reinject the stored geothermal water into the reinjection well sink; when the reinjection test is carried out, the water storage mechanism can provide a stable water source to ensure that there is enough water available during the geothermal well reinjection test. This helps to ensure the continuity and reliability of the test; in some cases, such as when the submersible geothermal pump is damaged or the pipeline is damaged, the temporary water source may be interrupted. The water storage mechanism can be used as a backup water source to ensure that the test work is not affected in these situations; in addition, when the water extraction and reinjection tests are carried out simultaneously, there may be problems with the unstable supply of the test water source. The water storage mechanism can reduce the dependence on these external factors and improve the controllability of the test.

[0075] In some embodiments, the water storage device can also be externally connected with a heat exchange mechanism, and the geothermal water extracted during the water extraction test is sent into the heat exchange mechanism to recover and utilize the geothermal energy contained in the geothermal water, thus saving energy.

[0076] The embodiments of the present application also provide a geothermal well testing method, which is applied to the above-mentioned geothermal well testing device, as Figure 2 shown, the testing method includes:

[0077] S201. Obtain the first state parameter;

[0078] S202. Determine the target water extraction flow rate and the target temperature according to the first state parameter;

[0079] S203. In response to the current water extraction flow rate not meeting the target water extraction flow rate, or the current temperature not meeting the target temperature, control the water extraction flow rate of the water extraction mechanism 2 based on the target water extraction flow rate and the target temperature.

[0080] In the geothermal well testing method provided by the embodiments of the present application, the detection mechanism 3 acquires the first state parameters of the geothermal water in the geothermal well and sends them to the control mechanism 4. The control mechanism 4 calculates the target extraction flow rate and the target temperature according to the first state parameters. When the current extraction flow rate of the geothermal water does not meet the target extraction flow rate or the current temperature does not meet the target temperature, the control mechanism 4 controls the extraction flow rate of the water extraction mechanism 2 so that the current extraction flow rate and the current temperature reach or approach the corresponding target values.

[0081] In some embodiments, first, the detection mechanism 3 collects the first state parameters of the geothermal water in the geothermal well, including information such as the current temperature, pressure, current extraction flow rate, and liquid level height.

[0082] According to the actual application requirements and the first state parameters, the target extraction flow rate and the extraction temperature are initially set.

[0083] Start the geothermal well water extraction test and monitor the various data of the geothermal water in real time. Under the condition that the pressure remains unchanged and the temperature change value is within the preset range, adjust the current extraction flow rate to gradually approach and until it equals the target extraction flow rate. When the detection mechanism detects that the current extraction flow rate equals the target extraction flow rate; detect the current temperature. If the current temperature meets the target temperature, the water extraction test is completed; if the current temperature is less than the target temperature, lower the current extraction flow rate in small ranges multiple times until it is detected that the current temperature equals the target temperature, and record the current extraction flow rate at this time.

[0084] Further, update the target extraction flow rate according to the current extraction flow rate, and conduct the water extraction test again with the updated target extraction flow rate and the target temperature. If the current extraction flow rate equals the target extraction flow rate and the current temperature equals the target temperature, the water extraction test is completed.

[0085] It should be noted that during the water extraction test process, it is necessary to ensure that the liquid level height is higher than the installation position of the geothermal well submersible pump to prevent the geothermal well submersible pump from pumping out the well water in the geothermal well.

[0086] In some embodiments of the present application, as Figure 3 shown, the testing method may further include:

[0087] S301. Acquire the second state parameters;

[0088] S302. Determine the target reinjection flow rate and the target reinjection pressure according to the second state parameters;

[0089] S303. In response to the current reinjection flow rate not meeting the target reinjection flow rate, or the current reinjection pressure not meeting the target reinjection pressure, control the reinjection flow rate of the reinjection mechanism 6 based on the target reinjection flow rate and the target reinjection pressure.

[0090] In the geothermal well testing method provided by the embodiments of the present application, the detection mechanism 3 acquires the second state parameters of the geothermal water in the geothermal well and sends them to the control mechanism 4. The control mechanism 4 calculates the target re-injection flow rate and the target re-injection pressure according to the second state parameters. When the current re-injection flow rate of the geothermal water does not meet the target re-injection flow rate or the current re-injection pressure does not meet the target re-injection pressure, the control mechanism 4 controls the re-injection flow rate of the re-injection mechanism 6 so that the current re-injection flow rate and the current re-injection pressure reach or approach the corresponding target values.

[0091] In some embodiments, first, the detection mechanism 3 collects the second state parameters of the geothermal water in the geothermal well, including information such as the current re-injection pressure and the current re-injection flow rate.

[0092] According to the actual application requirements and the second state parameters, the target re-injection flow rate and the target re-injection pressure are initially set.

[0093] Start the geothermal well re-injection test, and monitor the data of the geothermal water in real time. When the pressure change value is within the preset range, adjust the current re-injection flow rate to gradually approach and until it is equal to the target re-injection flow rate. When the detection mechanism detects that the current re-injection flow rate is equal to the target re-injection flow rate, detect the current re-injection pressure. If the current re-injection pressure meets the target re-injection pressure, the re-injection test is completed. If the current re-injection pressure is less than the target re-injection pressure, lower the current re-injection flow rate in small ranges multiple times until it is detected that the current re-injection pressure is equal to the target re-injection pressure, and record the current re-injection pressure at this time.

[0094] Further, update the target re-injection flow rate according to the current re-injection flow rate, and conduct the re-injection test again with the updated target re-injection flow rate and the target re-injection pressure. If the current re-injection pressure is equal to the target re-injection pressure when the current re-injection flow rate is equal to the target re-injection flow rate, the re-injection test is completed.

[0095] In the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The term "plurality" means two or more, unless otherwise clearly defined.

[0096] After considering the specification and practicing the invention disclosed herein, those skilled in the art will readily conceive of other embodiments of the present application. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and embodiments are only regarded as exemplary.

[0097] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A geothermal well testing device, characterized in that, The geothermal well testing device includes: a mounting base (1), a water extraction mechanism (2), a detection mechanism (3), and a control mechanism (4) mounted on the mounting base (1); The water extraction mechanism (2) and the detection mechanism (3) are respectively connected to the control mechanism (4). The water extraction mechanism (2) is used to extract geothermal water from the geothermal well. The detection mechanism (3) is used to collect the first state parameters of the geothermal water and send them to the control mechanism (4). The control mechanism (4) is configured to control the extraction flow rate of the geothermal water by the water extraction mechanism (2) according to the first state parameters, where the first state parameters include the liquid level height, current temperature, current extraction pressure, and current extraction flow rate of the geothermal water.

2. The geothermal well testing device according to claim 1, wherein The detection mechanism (3) includes a liquid level monitoring unit (31). The liquid level monitoring unit (31) is connected to the geothermal well and is configured to emit sound waves into the geothermal water in the geothermal well, receive the sound waves reflected by the liquid level of the geothermal water, and determine the liquid level height of the geothermal water in the geothermal well according to the time difference between the emitted sound waves and the received reflected sound waves.

3. The geothermal well testing device according to claim 2, wherein The geothermal well testing device includes a test gate and a first stop valve (5). The test gate is used to connect the geothermal well and the liquid level monitoring unit (31); The first stop valve (5) is located between the liquid level monitoring unit (31) and the test gate and is controllably used to conduct or cut off the pipeline between the geothermal well and the liquid level monitoring unit (31).

4. The geothermal well testing device according to claim 1, wherein, The geothermal well testing device further includes a reinjection mechanism (6). The reinjection mechanism (6) is respectively connected to the water outlet end of the water extraction mechanism (2) and the reinjection well and is used to reinject the geothermal water into the reinjection well; Wherein, the reinjection mechanism (6) is respectively connected to the detection mechanism (3) and the control mechanism (4). The control mechanism (4) is configured to control the reinjection flow rate of the reinjection well by the reinjection mechanism (6) according to the second state parameters sent by the detection mechanism (3). The second state parameters include the current reinjection pressure and the current reinjection flow rate.

5. The geothermal well testing device according to claim 4, wherein The detection mechanism (3) includes a temperature sensor (32), a first pressure transmitter (33), a flow meter (34), and a second pressure transmitter (35) arranged in sequence from the water extraction end to the water outlet end of the water extraction mechanism (2).

6. The geothermal well testing device according to claim 5, wherein The geothermal well testing device includes a second stop valve (7) and a third stop valve (8); The second stop valve (7) is located between the flow meter (34) and the first pressure transmitter (33), and the third stop valve (8) is located between the water outlet end of the water extraction mechanism (2) and the second pressure transmitter (35).

7. The geothermal well testing device according to claim 4, characterized in that The geothermal well testing device includes a first pump body and a second pump body (61); The first pump body is connected to the water extraction mechanism (2), the second pump body (61) is connected to the reinjection mechanism (6), the first pump body and the second pump body (61) are respectively connected to the detection mechanism (3), and the detection mechanism (3) is configured to control the frequency of the first pump body according to the first state parameter and control the frequency of the second pump body (61) according to the second state parameter.

8. The geothermal well testing device according to claim 4, wherein The geothermal well testing device further includes a water storage mechanism, and the water storage mechanism is respectively connected to the water outlet end of the water extraction mechanism (2) and the water inlet end of the reinjection mechanism (6) for storing the geothermal water extracted by the water extraction mechanism (2).

9. A geothermal well testing method, applied to the geothermal well testing device according to any one of claims 1 to 8, characterized in that, The testing method includes: Obtaining the first state parameter; Determining a target extraction flow rate and a target temperature according to the first state parameter; In response to the current extraction flow rate not meeting the target extraction flow rate or the current temperature not meeting the target temperature, controlling the extraction flow rate of the water extraction mechanism (2) based on the target extraction flow rate and the target temperature.

10. The geothermal well testing method according to claim 9, characterized in that, The geothermal well testing device further includes a reinjection mechanism (6), and the reinjection mechanism (6) is used to reinject the extracted geothermal water into a reinjection well; Wherein, the reinjection mechanism (6) is respectively connected to the detection mechanism (3) and the control mechanism (4), and the control mechanism (4) is configured to control the reinjection flow rate of the reinjection mechanism (6) into the reinjection well according to the second state parameter sent by the detection mechanism (3), and the second state parameter includes the current reinjection pressure and the current reinjection flow rate; The testing method further includes: Obtaining the second state parameter; Determining a target reinjection flow rate and a target reinjection pressure according to the second state parameter; In response to the current reinjection flow rate not meeting the target reinjection flow rate or the current reinjection pressure not meeting the target reinjection pressure, controlling the reinjection flow rate of the reinjection mechanism (6) based on the target reinjection flow rate and the target reinjection pressure.

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