Geothermal development simulation test device and method

Abstract

The application provides a geothermal development simulation test device and method, the geothermal development simulation test device comprises a high-temperature and high-pressure resistant container (6), a high-pressure injection system (1), a confining pressure loading system (2), an axial pressure loading system (3) and an axial pressure unloading system (4), the high-temperature and high-pressure resistant container (6) comprises a core containing cavity and a piston containing cavity which are sequentially communicated, and the core containing cavity can contain a core sample (606); the confining pressure loading system (2) can apply confining pressure to the core sample (606); the axial pressure loading system (3) can apply axial pressure to the core sample (606) through a piston (610); and the axial pressure unloading system (4) can remove the axial pressure applied to the core sample (606) through the piston (610). The geothermal development simulation test device and method can more truly simulate the geothermal development process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of geothermal development simulation, in particular to a geothermal development simulation test device and a geothermal development simulation test method. BACKGROUND

[0002] The demand for energy is growing, and the traditional fossil energy is becoming increasingly exhausted, and its widespread use has brought serious problems to the ecological environment. The solution to the energy problem is to find new clean energy. Geothermal resources are renewable heat energy inside the earth, and the global geothermal energy reserves and resource potential are very large. The heat energy from the earth's interior to the ground surface is equivalent to 100PW·h (1PW=1015W) per year. Geothermal energy is a renewable and harmless green energy stored underground, and its social, economic and environmental benefits are very significant. Especially since the 21st century, geothermal energy has been widely used in power generation, heating, greenhouse, breeding, medical treatment, tourism, extraction of chemical raw materials, and bottled mineral water.

[0003] The geothermal energy exploitation method is to drill a well from the ground surface to the designed depth, to improve the low permeability of the underground environment by artificial fracturing, to form a large-area fracture network between the injection well and the production well. By injecting heat energy medium (water or carbon dioxide, etc.) into the injection well, the medium will be fully heat exchanged in the formed underground fracture network and be extracted from the extraction well at a higher temperature to complete the exploitation of geothermal energy. At present, the development of geothermal wells is still in the initial stage, and the production and test data are lacking, and the lack of in-depth understanding of the underground environment affects the development efficiency.

[0004] The indoor simulation device has been applied to carry out geothermal exploitation test to obtain meaningful test data. For example, Chinese patent document CN 106872651 A, published on June 20, 2017, discloses an enhanced geothermal exploitation simulation test device and simulation method, which is provided with a first pump and a heating device to simulate the underground high-temperature and high-pressure environment at different depths. A second pump is also provided to provide high-pressure liquid to the sample's liquid inlet hole in the test space, and a plurality of acoustic emission sensors are installed in a surrounding sample manner to locate the acoustic emission event and develop wave velocity tomography for monitoring the position of the crack and the evolution law of the crack size. SUMMARY

[0005] In order to solve the more real simulation geothermal development process, the present application provides a kind of geothermal development simulation test device and method, which can simulate the geothermal development process more realistically, solve the problem that current geothermal development simulation test cannot obtain test data which has greater effect on production parameter optimization and production efficiency improvement in actual field production, and provide theoretical and experimental basis for geothermal development in the field.

[0006] The technical scheme adopted by the present application to solve its technical problems is:

[0007] A kind of geothermal development simulation test device, comprising:

[0008] High temperature and high pressure container, inside contains core containing cavity and piston containing cavity communicated in sequence, the core containing cavity can accommodate core sample, the piston containing cavity is equipped with piston;

[0009] High pressure injection system, can inject heat exchange fluid into core sample;

[0010] Confining pressure loading system, can apply confining pressure to core sample;

[0011] Axial pressure loading system, can apply axial pressure to core sample by piston;

[0012] Axial pressure release system, can release the axial pressure that core sample receives by piston.

[0013] A kind of geothermal development simulation test method, the geothermal development simulation test method adopts the above-mentioned geothermal development simulation test device, and the geothermal development simulation test method includes the following steps:

[0014] Step 1, making core sample, drilling blind hole to core sample, installing simulation injection well and simulation production well in the blind hole, and loading core sample into high temperature and high pressure container;

[0015] Step 2, confining pressure loading system applies confining pressure to core sample, and axial pressure loading system applies the axial pressure to core sample;

[0016] Step 3, high pressure injection system injects heat exchange fluid into the simulation injection well of core sample, collects and tests the heat exchange fluid discharged from the simulation production well of core sample;

[0017] Step 4, axial pressure release system releases the axial pressure that core sample receives, and confining pressure loading system releases the confining pressure of core sample;

[0018] Step 5, remove core sample from high temperature and high pressure container.

[0019] The beneficial effects of the present application are:

[0020] 1. The axial pressure and confining pressure of rock can be loaded independently, simulating the real underground environment.

[0021] 2. The ground circulating oil bath is used to heat the sample to simulate the high temperature environment of the underground, and the effect of geothermal energy on the exploitation can be simulated.

[0022] 3. The core size is large, and multiple groups of injection wellbores and production wellbores can be set.

[0023] 4. The applied pressure is high. The axial pressure, injection pressure and confining pressure can all reach 120 MPa, which can simulate the high pressure environment of deep and ultra-deep wells. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the application, explain the application. The detailed description of the application does not constitute an undue limitation on the scope of the application, but serves as a specific example of a disclosure.

[0025] Figure 1 is a schematic view of the geothermal development simulation test device described in the present application.

[0026] Figure 2 is an axial view of the high temperature and high pressure resistant container.

[0027] Figure 3 is an elevation view of the high temperature and high pressure resistant container.

[0028] Figure 4 is a schematic view of the piston.

[0029] Figure 5 is a schematic view of the heating plate.

[0030] Figure 6 is a connection schematic view of the fluid passage in the heating plate.

[0031] 1. High pressure injection system; 2. Confining pressure loading system; 3. Axial pressure loading system; 4. Axial pressure unloading system; 5. Circulating oil bath heating system; 6. High temperature and high pressure resistant container; 7. Data acquisition, control and display system;

[0032] 10. First constant speed and constant pressure pump; 11. First valve; 12. First pressure gauge;

[0033] 20. Second constant speed and constant pressure pump; 21. Second valve; 22. Second pressure gauge; 23. Confining pressure injection pipeline;

[0034] 30. Third constant speed and constant pressure pump; 31. Third valve; 32. Third pressure gauge;

[0035] 40. Fourth constant speed and constant pressure pump; 41. Fourth valve; 42. Fourth pressure gauge;

[0036] 50, oil bath pan; 51, hot oil inlet line; 52, hot oil outlet line; 53, temperature testing device;

[0037] 600, heat exchange medium injection line; 601, simulated injection wellbore; 602, simulated production wellbore; 603, heat exchange medium discharge line; 604, end cap; 605, vessel body; 606, core sample; 607, rubber sleeve; 608, sealing end plate; 609, heater plate; 610, piston; 611, top piston passage; 612, bottom piston passage; 613, bottom support; 614, bolt and nut; 615, pressurization cavity; 616, depressurization cavity; 617, confining pressure cavity; 618, sealing ring; 619, pipe joint;

[0038] 6100, piston step; 6090, fluid passage. DETAILED DESCRIPTION

[0039] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] A geothermal development simulation test device, comprising:

[0041] A high-temperature and high-pressure resistant container 6, containing a core accommodating cavity and a piston accommodating cavity in sequence, the core accommodating cavity being capable of accommodating a core sample 606, and the piston accommodating cavity being provided with a piston 610;

[0042] A high-pressure injection system 1, capable of injecting a heat exchange fluid into the core sample 606;

[0043] A confining pressure loading system 2, capable of applying a confining pressure to the core sample 606;

[0044] An axial pressure loading system 3, capable of applying an axial pressure to the core sample 606 through the piston 610;

[0045] An axial pressure releasing system 4, capable of releasing the axial pressure applied to the core sample 606 through the piston 610, as shown in Figures 1 to 3

[0046] ​In the embodiment, the high-temperature and high-pressure resistant container 6 comprises an upper and lower detachable sealingly connected end cover 604 and a container body 605, and the end cover 604 and the container body 605 can be connected by bolts and nuts 614. The core containing cavity and the piston containing cavity are located in the container body 605, the volume of the core containing cavity is greater than that of the piston containing cavity, the core containing cavity and the piston containing cavity are arranged in an upper and lower manner, the high-temperature and high-pressure resistant container 6 can withstand a pressure of 100 MPa-150 MPa, and the high-temperature and high-pressure resistant container 6 can withstand a temperature of 400℃-600℃.

[0047] In the embodiment, the upper part of the high-temperature and high-pressure resistant container 6 is provided with the end cover 604, the end cover 604 is connected with the heat exchange medium injection pipeline 600, the high-pressure injection system 1 is connected with the heat exchange medium injection pipeline 600, the heat exchange medium injection pipeline 600 can be connected with the simulated injection wellbore 601 in the core sample 606, and the high-pressure injection system 1 comprises a first constant-speed and constant-pressure pump 10, a first valve 11 and a first pressure gauge 12. The high-pressure injection system 1 can inject the heat exchange fluid into the simulated injection wellbore 601 of the core sample 606 through the heat exchange medium injection pipeline 600, and the high-pressure injection system 1 is used to simulate the actual working condition of the injection well.

[0048] The first constant-speed and constant-pressure pump 10 is a metering pump capable of providing fluid with constant pressure or constant flow, the pressure range of the first constant-speed and constant-pressure pump 10 is 0 MPa-120 MPa, and the flow range is 0.01 ml / min-100 ml / min. The first valve 11 is a stop valve, which realizes the functions of cutting off and unblocking the pipeline. The first pressure gauge 12 realizes the setting of the loaded pressure, and the pressure measurement accuracy is 0.1% FS.

[0049] In the embodiment, when the core sample 606 is contained in the core containing cavity, a confining pressure cavity 617 is formed between the periphery (front, back, left and right) of the core sample 606 and the high-temperature and high-pressure resistant container 6, the end cover 604 is provided with a confining pressure injection pipeline 23, the confining pressure loading system 2 is connected with the confining pressure injection pipeline 23, the confining pressure injection pipeline 23 communicates with the core containing cavity and the confining pressure cavity 617, and the confining pressure loading system 2 comprises a second constant-speed and constant-pressure pump 20, a second valve 21 and a second pressure gauge 22. The confining pressure loading system 2 can inject high-pressure liquid into the confining pressure cavity 617 through the confining pressure injection pipeline 23 to apply confining pressure to the core sample 606, and the confining pressure loading system 2 is used to simulate the confining pressure suffered by the underground rock.

[0050] The second constant-speed constant-pressure pump 20 is a metering pump capable of providing fluid with constant pressure or constant flow rate, the pressure range of the second constant-speed constant-pressure pump 20 is 0MPa-120MPa, and the flow rate range is 0.01ml / min-100ml / min. The second valve 21 is a stop valve, which realizes the functions of cutting off and unblocking the pipeline. The second pressure gauge 22 realizes the setting of the loaded pressure, and the pressure measurement accuracy is 0.1%FS.

[0051] In the embodiment, the upper end of the piston 610 is directed towards the core accommodating cavity, a pressurizing cavity 615 is arranged between the lower end of the piston 610 and the lower end of the high-temperature and high-pressure resistant container 6, an annular piston step 6100 is arranged on the periphery of the piston 610, the piston step 6100 is located at the lower part of the piston 610, a pressure relief cavity 616 is arranged between the periphery (front, back, left and right) of the piston 610 and the high-temperature and high-pressure resistant container 6, and the pressure relief cavity 616 is located between the upper end of the piston 610 and the piston step 6100, as shown in Figures 2 to 4

[0052] In the embodiment, the high-temperature and high-pressure resistant container 6 is provided with a top-piston passage 611, the top-piston passage 611 is located at the lower end of the container main body 605, the top-piston passage 611 is in a vertical state, the top-piston passage 611 is in communication with the pressurizing cavity 615, the axial pressure loading system 3 is connected with the top-piston passage 611, and the axial pressure loading system 3 comprises a third constant-speed constant-pressure pump 30, a third valve 31 and a third pressure gauge 32. The axial pressure loading system 3 can inject high-pressure liquid into the pressurizing cavity 615, so as to move the piston 610 upwards and apply axial pressure to the core sample 606.

[0053] The third constant-speed constant-pressure pump 30 is a metering pump capable of providing fluid with constant pressure or constant flow rate, the pressure range of the third constant-speed constant-pressure pump 30 is 0MPa-120MPa, and the flow rate range is 0.01ml / min-100ml / min. The third valve 31 is a stop valve, which realizes the functions of cutting off and unblocking the pipeline. The third pressure gauge 32 realizes the setting of the loaded pressure, and the pressure measurement accuracy is 0.1%FS.

[0054] In the embodiment, the high-temperature and high-pressure resistant container 6 is provided with a top-piston passage 611, the top-piston passage 611 is located at the lower end of the container main body 605, the top-piston passage 611 is in a vertical state, the top-piston passage 611 is in communication with the pressurizing cavity 615, the axial pressure loading system 3 is connected with the top-piston passage 611, and the axial pressure loading system 3 comprises a third constant-speed constant-pressure pump 30, a third valve 31 and a third pressure gauge 32. The axial pressure loading system 3 can inject high-pressure liquid into the pressurizing cavity 615, so as to move the piston 610 upwards and apply axial pressure to the core sample 606.

[0055] ​The fourth constant-speed constant-pressure pump 40 is a pre-pressurizing pump, which can keep the pressure at a constant level by adjusting the rotating speed. The flow rate range of the fourth constant-speed constant-pressure pump 40 is 0 L / min-15 L / min, and the pre-pressurizing pressure is 15 MPa. The fourth valve 41 is a stop valve, which realizes the functions of cutting off and unblocking the pipeline. The fourth pressure gauge 42 realizes the setting of the loaded pressure, and the pressure measurement accuracy is 0.1% FS.

[0056] In the embodiment, the geothermal development simulation test device further comprises a heating plate 609, the heating plate 609 is capable of heating the core sample 606, the heating plate 609 is capable of being located between the core sample 606 and the piston 610, and the core sample 606, the heating plate 609 and the piston 610 are sequentially stacked from top to bottom. The heating plate 609 can release heat to heat the core sample 606, and the heating plate 609 can adopt any existing heating mode, such as electric heating or heat conduction oil heating. The heating plate 609 is used to heat the core sample 606 to simulate the high-temperature environment of the geothermal layer.

[0057] In the embodiment, the geothermal development simulation test device further comprises a circulating oil bath heating system 5 and a sealing end plate 608, the heating plate 609 is provided with a fluid channel 6090, the sealing end plate 608 is sealingly connected (such as welded) with the heating plate 609, the fluid channel 6090 has good sealing effect to avoid leakage of the heat conduction oil in the fluid channel 6090. The circulating oil bath heating system 5 comprises an oil bath pot 50, a hot oil inlet pipeline 51 and a hot oil outlet pipeline 52, the oil bath pot 50 is communicated with one end of the fluid channel 6090 through the hot oil inlet pipeline 51, the hot oil outlet pipeline 52 is communicated with the other end of the fluid channel 6090, and the hot oil inlet pipeline 51 and the hot oil outlet pipeline 52 both pass through the high-temperature and high-pressure resistant container 6, and the hot oil outlet pipeline 52 is provided with a temperature testing device 53. The circulating oil bath heating system 5 can inject circulating heat conduction oil into the fluid channel 6090 of the heating plate 609.

[0058] The sealing end plate 608 is arranged above and below the heating plate 609, the edge of the sealing end plate 608 is sealingly connected with the heating plate 609, the core sample 606, the sealing end plate 608, the heating plate 609 and the piston 610 are sequentially connected from top to bottom, the sealing end plate 608, the heating plate 609 and the piston 610 can be fixed as a whole, and the sealing end plate 608 and the heating plate 609 can move synchronously with the piston 610. The circulating oil bath heating system 5 further comprises an oil pump, the oil pump injects the heat conduction oil in the oil bath pot 50 into the fluid channel 6090 through the hot oil inlet pipeline 51, and the heat conduction oil in the fluid channel 6090 returns to the oil bath pot 50 through the hot oil outlet pipeline 52, so as to form a circulating oil bath heating.

[0059] The fluid passage 6090 is in a grid structure, and the sealing end plate 608 and the heating plate 609 are both located in the lower end of the core accommodating cavity, as shown in Figure 3 and Figure 5 To avoid the communication between the pressure relief cavity 616 and the confining pressure cavity 617, a sealing ring 618 is arranged between the inner surface of the piston accommodating cavity and the piston 610, and the sealing ring 618 is located in the upper end of the pressure relief cavity 616. The outer surface of the piston 610 or the inner surface of the piston accommodating cavity can be provided with a sealing ring mounting groove for mounting the sealing ring 618. The hot oil inlet line 51 and the hot oil outlet line 52 both pass through the end cover 604 and the container main body 605 of the high-temperature and high-pressure resistant container 6, and both are in an L-shaped structure.

[0060] Since the diameter of the core accommodating cavity is larger than that of the piston accommodating cavity, the lower end of the core accommodating cavity is provided with an annular flat surface, and two vertical pipe joints 619 are arranged at the annular flat surface. The lower ends of the two pipe joints 619 are respectively connected to the hot oil inlet line 51 and the hot oil outlet line 52 in a one-to-one correspondence, and the upper ends of the two pipe joints 619 are both sealingly inserted into the heating plate 609. The heating plate 609 can move up and down relative to the pipe joints 619, and the two pipe joints 619 are both in communication with the fluid passage 6090 in the heating plate 609. The connection mode of the pipe joint 619 and the heating plate 609 can ensure that the circulating oil bath heating system 5 injects circulating flowing heat conducting oil into the fluid passage 6090 of the heating plate 609 during the synchronous up-and-down movement of the heating plate 609 and the piston 610, without leakage of the heat conducting oil, as shown in Figure 6 .

[0061] In addition, the lower end of the high-temperature and high-pressure resistant container 6 is externally provided with a bottom support 613, and the upper surface of the core sample 606 and the lower surface of the end cover 604 of the high-temperature and high-pressure resistant container 6 are both flat surfaces and can be closely attached to each other. The lower surface of the core sample 606 and the upper surface of the sealing end plate 608 are both flat surfaces and can be closely attached to each other. The length and width of the core sample 606 are smaller than the length and width of the core accommodating cavity,

[0062] The size of the core sample 606 can be set to any size between 100×100×100mm and 500×500×500mm or a cylinder with a size of 100×100mm to 500×500mm according to the test requirements. In use, the core sample 606 is wrapped by the rubber sleeve 607, and the core sample 606 and the rubber sleeve 607 are closely attached. The upper end of the rubber sleeve 607 can be sealingly connected to the end cover 604, and the lower end of the rubber sleeve 607 can be sealingly connected to the sealing end plate 608. The rubber sleeve 607 can be square or cylindrical according to the shape of the core sample. At least one set of simulated injection wellbore 601 and simulated production wellbore 602 is arranged on the core sample, and the simulated injection wellbore 601 and the simulated production wellbore 602 are parallel to each other.

[0063] In the embodiment, the geothermal development simulation test device further comprises a productivity test device, which can adopt a product of the prior art. The productivity test device can test the heat exchange fluid flowing out of the core sample 606, such as testing the temperature, pressure, flow rate, composition, and other material and chemical parameters of the heat exchange fluid. The end cover 604 is further connected with a heat exchange medium discharge pipeline 603. The productivity test device is connected with the heat exchange medium discharge pipeline 603. The heat exchange medium injection pipeline 600 and the heat exchange medium discharge pipeline 603 both pass through the end cover 604. The heat exchange medium discharge pipeline 603 can be connected with the simulated production wellbore 602 in the core sample 606.

[0064] In the embodiment, the geothermal development simulation test device further comprises a data acquisition control display system 7. The data acquisition control display system 7 can acquire parameters of all constituent devices and can process data to realize graphic and report display. All constituent devices are electrically connected with the data acquisition control display system 7. Through detection and analysis of the productivity parameters of the heat exchange medium discharged from the simulated production wellbore 602 of the core sample 606, test data having a great effect on optimization of production parameters and improvement of production efficiency in actual field production can be obtained.

[0065] A geothermal development simulation test method is introduced below. The geothermal development simulation test method adopts the geothermal development simulation test device described above. Taking a shale sample with a size of 300 mm x 300 mm x 300 mm as an example, the injected fluid is water, the seepage medium is oil, and an 800 m deep formation is simulated with a temperature of 100°C. The geothermal development simulation test method comprises the following steps:

[0066] Step 1, manufacturing a core sample 606, drilling a blind hole in the core sample 606, installing a simulated injection wellbore 601 and a simulated production wellbore 602 in the blind hole, and loading the core sample 606 into a high-temperature and high-pressure container 6;

[0067] The diameter of the blind hole is φ10 mm, the depth of the blind hole is 100 mm, a steel pipe is inserted into the blind hole to form the simulated injection wellbore 601 and the simulated production wellbore 602, the core sample 606 is loaded into a rubber tube 607 with a corresponding size, and the connection pipelines of various pumps and high-temperature and high-pressure containers, various parameter measuring devices, and data acquisition control display system acquisition lines are connected, as shown in FIG. 5. Figure 1

[0068] Step 2, the confining pressure loading system 2 applies confining pressure to the core sample 606, the axial pressure loading system 3 applies axial pressure to the core sample 606, and the circulating oil bath heating system 5 heats the core sample 606;

[0069] ​For example, start the third constant speed and constant pressure pump 30 to apply the axial pressure of 50 MPa to the core sample 606 and keep the pressure monitored; start the second constant speed and constant pressure pump 20 to apply the confining pressure of 30 MPa to the core sample 606 and keep the pressure monitored; start the circulating oil bath heating system 5 to heat the core sample 606 to 100°C and keep the temperature constant for 30 minutes.

[0070] Step 3: The high-pressure injection system 1 injects heat exchange fluid into the simulated injection wellbore 601 of the core sample 606, and collects and tests the heat exchange fluid discharged from the simulated production wellbore 602 of the core sample 606.

[0071] For example, the first constant-speed, constant-pressure pump 10 of the high-pressure injection system 1 injects water into the simulated injection wellbore 601 of the core sample 606 at a rate of 50 mL / min, maintaining a constant flow rate for 60 minutes. The physical and chemical parameters of the heat exchange fluid discharged from the simulated production wellbore 602 of the core sample 606 are collected and tested.

[0072] Step 4: The axial pressure relief system 4 relieves the axial pressure on the core sample 606, and the confining pressure loading system 2 relieves the confining pressure on the core sample 606.

[0073] For example, when the fourth constant speed and constant pressure pump 40 is started, the piston 610 moves upward, relieving the axial pressure on the core sample 606, and the second constant speed and constant pressure pump 20 is unloaded, relieving the confining pressure on the core sample 606.

[0074] Step 5: Remove core sample 606 from the high-temperature and high-pressure container 6; analyze the fracturing effect of core sample 606.

[0075] Export the experimental data and analyze and process it.

[0076] For ease of understanding and description, this invention uses absolute positional relationships for description. Unless otherwise specified, the directional term "above" indicates... Figure 3 The direction above, the directional word "down" indicates Figure 3 The lower side of the middle, "left" indicates Figure 3 The left side of the direction, the directional word "right" indicates Figure 3 The right-hand direction in the middle, "front" means perpendicular to Figure 3 The direction of the paper and pointing inwards from the paper; the directional word "back" indicates perpendicular to the paper. Figure 3 The direction is towards the outside of the paper. This invention is described from the perspective of a reader or user, but the aforementioned directional terms should not be understood or interpreted as limiting the scope of protection of this invention.

[0077] The above merely describes specific embodiments of the present application and cannot be used to limit the scope of the application, so replacement of equivalent components or equivalent changes and modifications made within the scope of the patent protection of the present application should still fall within the scope of the present patent. In addition, the technical features in the present application and between technical features, technical features and technical solutions, and between technical solutions can be freely combined for use.

Claims

1. A geothermal development simulation test device, characterized in that, The geothermal development simulation test device includes: The high-temperature and high-pressure container (6) contains a core receiving cavity and a piston receiving cavity connected in sequence. The core receiving cavity can accommodate a core sample (606), and the piston receiving cavity is equipped with a piston (610). The high-pressure injection system (1) is capable of injecting heat exchange fluid into the core sample (606); The confining pressure loading system (2) is capable of applying confining pressure to the core sample (606); The axial pressure loading system (3) can apply axial pressure to the core sample (606) via the piston (610); The axial pressure relief system (4) can relieve the axial pressure on the core sample (606) by means of the piston (610); The geothermal development simulation test device also includes a circulating oil bath heating system (5), a sealing end plate (608), and a heating plate (609). The heating plate (609) can heat the core sample (606). The core sample (606), the sealing end plate (608), the heating plate (609), and the piston (610) can be stacked and connected sequentially from top to bottom. A fluid channel (6090) is provided on the heating plate (609), and a sealing end plate (608) is sealed to the heating plate (609). The circulating oil bath heating system (5) includes an oil bath (50), a hot oil inlet pipeline (51) and a hot oil outlet pipeline (52). The oil bath (50) is connected to the fluid channel (6090) through the hot oil inlet pipeline (51), and the hot oil outlet pipeline (52) is connected to the fluid channel (6090). Both the hot oil inlet pipeline (51) and the hot oil outlet pipeline (52) pass through a high-temperature and high-pressure container (6). A temperature testing device (53) is provided on the hot oil outlet pipeline (52). The lower end of the core receiving cavity is provided with an annular plane, and two upright pipe joints (619) are provided at the annular plane. The lower ends of the two pipe joints (619) are respectively connected to the hot oil inlet pipeline (51) and the hot oil outlet pipeline (52). The upper ends of the two pipe joints (619) are sealed and inserted into the heating plate (609). The heating plate (609) can move up and down relative to the pipe joints (619). The two pipe joints (619) are connected to the fluid channel (6090) inside the heating plate (609).

2. The geothermal development simulation test device according to claim 1, characterized in that, The high-temperature and high-pressure container (6) is provided with an end cap (604) on the upper part. The end cap (604) is provided with a heat exchange medium injection pipeline (600). The high-pressure injection system (1) is connected to the heat exchange medium injection pipeline (600). The heat exchange medium injection pipeline (600) can be connected to the simulated injection wellbore (601) in the core sample (606). The high-pressure injection system (1) contains a first constant speed and constant pressure pump (10), a first valve (11) and a first pressure gauge (12).

3. The geothermal development simulation test device according to claim 1, characterized in that, The high-temperature and high-pressure container (6) is provided with an end cap (604) on the upper part. The end cap (604) is provided with a confining pressure injection pipeline (23). The confining pressure loading system (2) is connected to the confining pressure injection pipeline (23). The confining pressure injection pipeline (23) is connected to the core receiving cavity. The confining pressure loading system (2) contains a second constant speed and constant pressure pump (20), a second valve (21), and a second pressure gauge (22).

4. The geothermal development simulation test device according to claim 1, characterized in that, One end of the piston (610) faces the core receiving cavity, and the other end of the piston (610) is provided with a pressurizing cavity (615) between it and the high temperature and high pressure container (6). An annular piston step (6100) is provided on the outer side of the piston (610), and a pressure relief cavity (616) is provided between the outer side of the piston (610) and the high temperature and high pressure container (6).

5. The geothermal development simulation test device according to claim 4, characterized in that, The high-temperature and high-pressure container (6) is provided with a top piston channel (611), which is connected to the pressurization chamber (615). The axial pressure loading system (3) is connected to the top piston channel (611). The axial pressure loading system (3) includes a third constant speed and constant pressure pump (30), a third valve (31), and a third pressure gauge (32).

6. The geothermal development simulation test device according to claim 4, characterized in that, The high-temperature and high-pressure container (6) is provided with a piston retraction channel (612), which is connected to the pressure relief chamber (616). The axial pressure relief system (4) is connected to the piston retraction channel (612). The axial pressure relief system (4) contains a fourth constant speed and constant pressure pump (40), a fourth valve (41), and a fourth pressure gauge (42).

7. The geothermal development simulation test device according to claim 1, characterized in that, The high-temperature and high-pressure resistant container (6) includes an end cap (604) and a container body (605).

8. The geothermal development simulation test device according to claim 1, characterized in that, The geothermal development simulation test device also includes: The production capacity testing device is capable of testing the heat exchange fluid flowing out of the core sample (606). The production capacity testing device is connected to the heat exchange medium discharge pipeline (603), which is connected to the simulated production wellbore (602) inside the core sample (606). Data acquisition, control and display system (7).

9. A geothermal development simulation test method, characterized in that, The geothermal development simulation test method uses the geothermal development simulation test device as described in claim 1, and the geothermal development simulation test method includes the following steps: Step 1: Prepare a core sample (606), drill a blind hole in the core sample (606), install a simulated injection wellbore (601) and a simulated production wellbore (602) in the blind hole, and put the core sample (606) into a high-temperature and high-pressure container (6). Step 2: The confining pressure loading system (2) applies confining pressure to the core sample (606), and the axial pressure loading system (3) applies the axial pressure to the core sample (606); Step 3: The high-pressure injection system (1) injects heat exchange fluid into the simulated injection wellbore (601) of the core sample (606), and collects and tests the heat exchange fluid discharged from the simulated production wellbore (602) of the core sample (606). Step 4: The axial pressure relief system (4) relieves the axial pressure on the core sample (606), and the confining pressure loading system (2) relieves the confining pressure on the core sample (606). Step 5: Remove the core sample (606) from the high-temperature and high-pressure container (6).

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