Simulation device and method for meter-scale large-size rock in-situ heat injection oil and gas exploitation

Abstract

The invention discloses a simulation device and method for meter-scale large-size rock in-situ heat injection oil and gas exploitation, and belongs to the technical field of rock mechanics experiment equipment and mineral resource exploitation. The simulation device comprises a rigid pressure chamber, a high-temperature nanofluid generation and injection system, a pressure loading system, a temperature and pressure ultrasonic monitoring system and an oil-gas-water cooling separation system. Multi-dimensional stress loading and fluid control dynamic injection under the high-temperature condition can be achieved at the same time, a real rock burial stratum is simulated, and convection heating and oil-gas separation are conducted on rock through the in-situ mining technology; the method is mainly applied to the in-situ underground mining technology of coal, oil shale and other minerals, and can also be applied to the fields of geothermal development, geological disaster assessment and the like. And the problem of large data discreteness caused by a small regular sample experiment is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of rock mechanics experimental equipment and mineral resource exploitation, and relates to a simulation device and method for in-situ heat injection exploitation of oil and gas by large-size rocks of meter level. Background Art

[0002] The current methods of mining mineral resources mainly include traditional underground mining and surface distillation, which are easy to cause damage to the environment. After the in-situ convection heating technology is gradually promoted, it can directly heat rock samples for resource mining and reduce the impact on the surface ecology. However, the existing in-situ convection heating technology still has the following shortcomings in actual operation: 1. The heat transfer efficiency is limited. Ordinary high-temperature fluids are easily blocked due to uneven temperature or condensation in complex formation environments, which affects the heat transfer and material migration effects in the fractures.

[0003] 2. The fracture expansion network is unstable, lacks effective control measures, and cannot detect the cavities formed after oil and gas production.

[0004] 3. The accuracy of multi-physical field monitoring is insufficient, making it difficult to dynamically track the temperature field and pressure distribution inside the crack.

[0005] Patent CN114810052B provides a device and method for simulating the coupled damage of shale wellbore flow solidification under drill string disturbance. This scheme mainly simulates the physical impact caused by the interaction between the drill string and the wellbore wall, and does not involve large-scale and efficient in-situ oil and gas production, nor can it analyze the relevant mechanisms in underground in-situ convection heating production technology.

[0006] Patent CN117054471A provides a physical simulation experimental device and method for in-situ pyrolysis mining of large-scale oil-rich coal, which uses ordinary fluid as a heat carrier, has low heat transfer efficiency, and lacks real-time control of the temperature field in the cracks.

[0007] Patent CN109444020A provides a device and method for observing the microscopic characteristics of rock mass fissure seepage based on 3D printing technology. This solution is limited to small-scale seepage and fissure visualization analysis. It is small in size and cannot simulate complex fracture networks or macroscopic phenomena. At the same time, it does not involve issues such as resource exploitation and improving the exploitation rate, and has limited research on engineering activities and related mechanisms. Summary of the invention

[0008] The present invention overcomes the shortcomings of the prior art and proposes a simulation device and method for in-situ heat injection and oil and gas extraction of large-scale rock at the meter level, which can simultaneously realize multi-dimensional stress loading and dynamic injection of fluid control under high temperature conditions, and simulate the real buried strata of rock to use in-situ mining technology to perform convection heating of rock and separation of oil and gas. It is mainly used in in-situ underground mining technology of minerals such as coal, oil shale, etc., and can also be used in geothermal development, geological disaster assessment and other fields.

[0009] In order to achieve the above object, the present invention is achieved through the following technical solutions: A simulation device for in-situ heat injection extraction of oil and gas from meter-scale large-size rocks, comprising a rigid pressure chamber, a high-temperature nanofluid generation and injection system, a pressure loading system, a temperature and pressure ultrasonic monitoring system, and an oil-gas-water cooling and separation system; An irregular rock sample is placed in the rigid pressure chamber; cement mortar is filled between the rock sample and the inner wall of the rigid pressure chamber; after solidification, the cement mortar and the rock sample together form a sample to be tested; The high-temperature nanofluid generation and injection system includes a high-temperature nanofluid generation device, a nanofluid injection pipeline, and a drainage pipeline; the temperature and pressure ultrasonic monitoring system consists of a temperature sensor monitoring system, a pressure sensor monitoring system, an acoustic emission probe, an integrated high-precision magnetic sensor monitoring system, a magnetic field generating device, and a data processing device; Several boreholes are arranged inward from the top of the sample to be tested to form a well network, and a drainage pipeline is inserted into each borehole. The part of each drainage pipeline extending into the rock sample is set as a flower pipe, and the rest is a double-layer annulus pipe; the outer wall of the double-layer annulus pipe extending into the rigid pressure chamber is wrapped with a sealing packing, and a through-hole bolt is installed on the upper part of each drainage pipeline; the bottom structure of the pressure loading system acts on the surface of the sample to be tested and is connected to the drainage pipeline through the through-hole bolt; each drainage pipeline is connected to a nanofluid injection pipeline, and valves are set on the nanofluid injection pipeline and the drainage pipeline; The nanofluid injection pipeline is connected to a high-temperature nanofluid generation device, and the high-temperature nanofluid generation device provides high-temperature nanofluid for the nanofluid injection pipeline, wherein the high-temperature nanofluid is water mixed with magnetic nanoparticles; A temperature sensor and a pressure sensor are provided in each drainage pipeline; the temperature sensor is electrically connected to the temperature sensor monitoring system; the pressure sensor is electrically connected to the pressure sensor monitoring system; acoustic emission probes and integrated high-precision magnetic sensors are evenly distributed in the rock sample, and the acoustic emission probes are electrically connected to the acoustic analyzer; The integrated high-precision magnetic sensor is electrically connected to the integrated high-precision magnetic sensor monitoring system; a magnetic field generating device is installed outside the rigid pressure chamber; the direction of the magnetic field generated by the magnetic field generating device is consistent with the direction of the target crack; The top outlet of the production and drainage pipeline is connected to the oil, gas and water cooling and separation system through a condensation ring.

[0010] Furthermore, a plurality of ring-shaped sealing packings are arranged on the top surface of the sample to be tested.

[0011] Furthermore, a plurality of circles of drilled holes are arranged from the inside to the outside in an annular structure, and each circle of drilled holes is located between two adjacent annular circles of sealing packing.

[0012] Furthermore, the high-temperature nanofluid generating device includes a boiler, a high-pressure water supply pump and a water purification device.

[0013] Furthermore, the magnetic nanoparticles are nanometer-scale ferrosoferric oxide, the particle size of ferrosoferric oxide is 15-25 nm, and the mass percentage concentration in water is 4-6%.

[0014] Furthermore, the pressure loading system includes a press, a pressure transmission plate, and a spherical seat; the press at the top of the pressure loading system is connected to the pressure transmission plate through the spherical seat, and the pressure transmission plate acts on the sample to be tested.

[0015] A simulation method for in-situ heat injection exploitation of oil and gas by large-scale rock of meter scale is based on the simulation device for in-situ heat injection exploitation of oil and gas by large-scale rock of meter scale; and comprises the following steps: S1. Turn on the pressure loading system to apply axial force to the test sample in the rigid pressure chamber; S2, turning on the high-temperature nanofluid generating device to generate high-temperature nanofluid, and when the temperature of the high-temperature nanofluid reaches the temperature required for the experiment, opening the valves on one or more selected nanofluid injection pipelines to inject the high-temperature nanofluid into the pores of the rock sample to heat the rock; S3. After heating for a period of time, close the valve on the nanofluid injection pipeline, then open the valve on the corresponding drainage pipeline, and the oil and gas generated by the rock sample heating will flow out to the oil, gas and water cooling separation system through the opened pipeline; During the experiment, the data processing device collected the temperature and pressure change data in the drainage pipeline in real time, and dynamically displayed the three-dimensional temperature and pressure field distribution, analyzed the changes in temperature and pressure gradients over time, and combined with the high-precision magnetic sensor monitoring system and magnetic field generating device to control the flow path of high-temperature nanofluids in the cracks; S4. Replace different nanofluid injection pipelines and corresponding production pipelines, inject high-temperature nanofluids and produce oil and gas, and repeat steps S2 and S3 to perform experiments and data collection.

[0016] The beneficial effects of the present invention compared with the prior art are as follows: 1. The present invention combines magnetic nanofluids and magnetic field acoustic wave monitoring technology to have the functions of high-precision monitoring, intelligent fracture control, efficient heat injection and increased oil and gas production rate; the data acquisition dimensions are more diverse, including temperature field, pressure field, fracture expansion network and product flow monitoring, which is suitable for comprehensive analysis of multi-physical field data. Develop a new in-situ heat injection mining system suitable for high-temperature complex reservoir environments to improve pyrolysis efficiency, resource utilization and environmental adaptability. At the same time, the addition of specific nanomaterials can enhance the heat exchange efficiency, promote the reaction intensity of organic rocks at high temperatures, and improve mining efficiency and oil and gas production rates.

[0017] 2. The present invention overcomes the deficiency that only small-sized and regular-shaped rock samples can be used in previous experiments on rock heating for oil and gas extraction, and solves the problem of large data discreteness caused by experiments using small regular samples. It has high-precision monitoring, real-time and efficient fluid control, fracture cavity monitoring and efficient heat injection functions, and can truly reproduce the complex physical field changes and fracture evolution process of the reservoir, which is conducive to real-time control of the experimental progress during the experiment, as well as multi-field joint processing; it well simulates the situation of using in-situ convection heating technology to extract oil and gas in actual ore layers, so that the whole process of high-temperature nanofluid generation, controlled heating of rocks, oil and gas extraction, separation of oil, gas and water, and monitoring of rock temperature, pressure, and pore changes during the extraction process are fully controlled in the experimental operation. It previews the problems that may arise in the actual extraction process, while improving the pyrolysis efficiency and environmental adaptability, and to a certain extent, it also achieves increased oil and gas production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a simulation device for in-situ heat injection recovery of oil and gas from meter-scale large-size rocks according to the present invention; Figure 2 It is a schematic diagram of the connection position between the drainage pipeline and the sealing packing according to the present invention; Figure 3 yes Figure 2 Schematic diagram of the structure after the middle sealing packing is compressed; Figure 4 2 is a diagram of the drilling arrangement in the embodiment.

[0019] Numbers in the figure: 1-rigid pressure chamber, 101-cement mortar, 102-rock sample, 103-sealing packing; 201- boiler, 202- high-pressure water supply pump, 203- nanofluid injection pipeline, 204- drainage pipeline, 205- through-hole bolt, 206- flower pipe; 301-pressing machine, 302-pressure transmission plate, 303-spherical seat; 401-temperature sensor monitoring system, 402-pressure sensor monitoring system, 403-acoustic emission probe, 404-integrated high-precision magnetic sensor monitoring system, 405-magnetic field generating device; 5-oil, gas and water cooling and separation system, 501-condensing ring; 6- Drill holes. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail in conjunction with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The technical solutions of the present invention are described in detail below in conjunction with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0021] See also Figures 1 to 4 This embodiment proposes a simulation device for in-situ heat injection and oil and gas extraction from meter-scale large-sized rocks; it includes a rigid pressure chamber 1, a high-temperature nanofluid generation and injection system, a pressure loading system, a temperature and pressure ultrasonic monitoring system, and an oil-gas-water cooling and separation system 5.

[0022] A rock sample 102 is placed in the rigid pressure chamber 1; cement mortar 101 is filled between the rock sample 102 and the inner wall of the rigid pressure chamber 1; The high-temperature nanofluid generation and injection system is composed of a boiler 201, a high-pressure water supply pump 202, a water purification device, a nanofluid injection pipeline 203, a drainage pipeline 204, and a through-hole bolt 205; the drainage pipeline 204 is located inside the rock sample 102 and is a flower pipe 206, and the rest is a double-layer annulus pipe; The pressure loading system is composed of a press 301, a pressure transmission plate 302, and a spherical seat 303; The temperature and pressure ultrasonic monitoring system consists of a temperature sensor monitoring system 401, a pressure sensor monitoring system 402, an acoustic emission probe 403, an integrated high-precision magnetic sensor monitoring system 404, a magnetic field generating device 405 and a data processing device; it should be noted that each component in the temperature and pressure ultrasonic monitoring system is an existing device.

[0023] The oil-gas-water cooling and separation system 5 is composed of a condensation ring 501, a cooling circulation pump, a condensed liquid discharge valve, a gas discharge valve, a gas flow meter, a cooling water tank, and a temperature and pressure gauge.

[0024] The connection method is as follows: The rigid pressure chamber 1 is welded with steel side plates and bottom plates, and the thickness of the side plates and bottom plates is 8 mm. A cement mortar 101 with a thickness of 200 mm is poured into the bottom of the rigid pressure chamber 1, and then the rock sample 102 is placed horizontally on it. The rock sample 102 is then poured to the top of the rigid pressure chamber 1 with cement mortar 101, and the surface is smoothed and cured for 7 days until it is cemented and formed. The rock sample 102 can be a large-sized irregular structure of 1m~3m, and a regular cylindrical structure is formed after being poured with cement mortar 101. Three rings of sealing packing 103 are arranged around the top surface of the cylindrical structure from the inside to the outside, such as Figure 4 Wraparound method shown.

[0025] A well pattern is arranged on the top of the rigid pressure chamber 1, and a number of boreholes 6 are drilled into the rock sample 102 in a circular or rectangular arrangement to form a well pattern. In this embodiment, the boreholes 6 are arranged from the inside to the outside in a circular structure, and the diameter of each borehole 6 is 70 mm, and there are three depths, namely 30 cm, 50 cm, and 80 cm; Figure 1 Only the arrangement of some boreholes 6 at the same depth is shown. When drilling the well pattern, it is necessary to ensure that the drilled boreholes 6 are located between the two adjacent ring-shaped sealing packings 103 to prevent the temperature in the double-layer annulus pipe of the drainage pipeline 204 from being lost in the gap between the pressure transmission plate 302 and the cylindrical structure when injecting high-temperature nanofluid. The diameter of the drilled borehole 6 should be slightly larger than the diameter of the drainage pipeline 204, and the pressure transmission plate 302 part of the rigid pressure chamber 1 needs to be drilled with internal threads to add through-hole bolts 205.

[0026] A drainage pipe 204 is inserted into each borehole 6. The portion of each drainage pipe 204 extending into the rock sample 102 is set as a flower pipe 206, and the remaining portion is a double-layer annulus pipe; the outer wall of the double-layer annulus pipe extending into the rigid pressure chamber 1 is wrapped with a sealing packing 103, and a through-hole bolt 205 is installed on the upper part of each drainage pipe 204 (see Figure 2 ), in the process of tightening the through-hole bolts 205, the sealing packing 103 is compressed to ensure good sealing performance. After sealing, the position of the through-hole bolts 205 is as follows Figure 3 Each drainage pipeline 204 is connected to a nanofluid injection pipeline 203, and valves are provided on both the nanofluid injection pipeline 203 and the drainage pipeline 204; the valve on the nanofluid injection pipeline 203 is used to control the injection of high-temperature nanofluids, and the valve on the drainage pipeline 204 controls the outflow of oil, gas and water.

[0027] The nanofluid injection pipeline 203 is connected to the boiler 201, and the boiler 201 is connected to the water purification device and the high-pressure water supply pump 202. The high-temperature nanofluid is injected into the nanofluid injection pipeline 203 through the boiler 201; the main component of the high-temperature nanofluid is water, and the water is mixed with nano-scale ferrosoferric oxide; in this embodiment, the particle size of ferrosoferric oxide is 20nm, and the mass percentage concentration in water is 5%.

[0028] The top outlet of the production and drainage pipeline 204 is connected to the oil-gas-water cooling and separation system 5 through the condensation ring 501 , and the produced oil-gas-water cooling and separation system 5 condenses and separates the produced oil-gas-water.

[0029] A temperature sensor and a pressure sensor are provided in each drainage pipeline 204; the temperature sensor is electrically connected to the temperature sensor monitoring system 401; the pressure sensor is electrically connected to the pressure sensor monitoring system 402; an acoustic emission probe 403 and an integrated high-precision magnetic sensor are arranged on one side of each drainage pipeline 204 in the rock sample 102, and the acoustic emission probe 403 is electrically connected to an acoustic analyzer, which detects changes in the sound source inside the rock sample 102, and indirectly reflects the direction and degree of crack formation in the rock sample 102.

[0030] The integrated high-precision magnetic sensor is electrically connected to the integrated high-precision magnetic sensor monitoring system 404; a magnetic field generating device 405 is installed outside the rigid pressure chamber 1; the direction of the magnetic field generated by the magnetic field generating device 405 is consistent with the direction of the target crack, and the nano-scale ferroferric oxide is guided into the target area to form a crack network by controlling the magnetic field gradient outside the rigid pressure chamber 1.

[0031] A pressure loading system is placed above the top surface of the rigid pressure chamber 1 , and a press 301 at the top of the pressure loading system is connected to a pressure transmission plate 302 through a spherical seat 303 , and the pressure transmission plate 302 acts on the cylindrical structure. This embodiment also proposes a simulation method for in-situ heat injection recovery of oil and gas in large-scale rock of meter scale, which is performed using the above simulation device, and specifically includes the following steps: S1. Open the press 301 to apply axial force to the cylindrical structure in the rigid pressure chamber 1. Since the rigid pressure chamber 1 is rigid, the lateral deformation is relatively small when the axial pressure is applied and can be ignored. Therefore, the stress on the rock sample 102 simulates the stress state of the real ore layer rock. S2. Turn on the water purification device, the high-pressure water supply pump 202 and the boiler 201 to generate high-temperature nanofluid. After the high-temperature nanofluid is heated to the temperature required for the experiment, open the valves on one or more selected nanofluid injection pipelines 203 to inject the high-temperature nanofluid into the pores of the rock sample 102 to heat the rock. S3. After heating for a period of time, close the valve on the nanofluid injection pipeline 203, and then open the valve on the corresponding production pipeline 204. The oil and gas generated by the heating of the rock sample 102 will flow out to the oil-gas-water cooling separation system 5 along the opened pipeline. The condensation ring 501 plays a buffering role to prevent damage to the oil-gas-water cooling separation system 5. The oil and gas are separated in the oil-gas-water cooling separation system 5 and then collected separately.

[0032] During the experiment, the data processing device is used to collect real-time data on the temperature and pressure changes in the production and drainage pipeline 204, and dynamically display the three-dimensional temperature and pressure field distribution, and analyze the changes in temperature and pressure gradients over time. At the same time, combined with the high-precision magnetic sensor monitoring system 404 and the magnetic field generating device 405, the flow path of the high-temperature nanofluid in the fracture is regulated to optimize the fracture coverage and pyrolysis efficiency.

[0033] Nano-scale ferroferric oxide enhances heat conduction, catalyzes cracking reactions, and increases oil and gas production under high temperature conditions; and further optimizes reaction conditions with the assistance of a magnetic field, improves oil and gas conversion rates, and reduces energy waste. The acoustic emission probe 403, the integrated high-precision magnetic sensor monitoring system 404, and the magnetic field generator 405 work together to monitor the crack expansion, rock thermal cracking, and new cavity formation processes in real time, and the data processing device visualizes the output of the crack network, cavity evolution, and oil and gas migration to provide support for the optimization of mining plans.

[0034] S4, replace the nanofluid injection pipelines 203 and corresponding production pipelines 204 of different depths and groups, inject high-temperature nanofluid and produce oil and gas, and repeat the steps of S2 and S3 to perform experiments and data collection.

[0035] The simulation device and method described in this embodiment are mainly suitable for experimental research on the simulated mining of large-sized organic rocks using in-situ convection heating.

[0036] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be determined that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the present invention, which should be regarded as belonging to the present invention and the scope of patent protection determined by the submitted claims.

Claims

1. A simulation device for in-situ heat injection recovery of oil and gas from large-scale rocks of meter scale, characterized in that: It comprises a rigid pressure chamber (1), a high-temperature nanofluid generation and injection system, a pressure loading system, a temperature and pressure ultrasonic monitoring system, and an oil-gas-water cooling and separation system (5); An irregular rock sample (102) is placed in the rigid pressure chamber (1); cement mortar (101) is filled between the rock sample (102) and the inner wall of the rigid pressure chamber (1); after solidification, the cement mortar (101) and the rock sample (102) together form a sample to be tested; The high-temperature nanofluid generation and injection system comprises a high-temperature nanofluid generation device, a nanofluid injection pipeline (203) and a drainage pipeline (204); the temperature and pressure ultrasonic monitoring system comprises a temperature sensor monitoring system (401), a pressure sensor monitoring system (402), an acoustic emission probe (403), an integrated high-precision magnetic sensor monitoring system (404), a magnetic field generating device (405) and a data processing device; A plurality of boreholes (6) are arranged inward from the top of the sample to be tested to form a well network, and a drainage pipeline (204) is inserted into each borehole (6). The portion of each drainage pipeline (204) extending into the rock sample (102) is provided with a flower tube (206), and the remaining portion is a double-layer annulus pipe; the outer wall of the double-layer annulus pipe extending into the rigid pressure chamber (1) is wrapped with a sealing packing (103), and a through-hole bolt (205) is installed on the upper portion of each drainage pipeline (204); the bottom structure of the pressure loading system acts on the surface of the sample to be tested and is connected to the drainage pipeline (204) via the through-hole bolt (205); each drainage pipeline (204) is connected to a nanofluid injection pipeline (203), and valves are provided on the nanofluid injection pipeline (203) and the drainage pipeline (204); The nanofluid injection pipeline (203) is connected to a high-temperature nanofluid generation device, and the high-temperature nanofluid generation device provides high-temperature nanofluid for the nanofluid injection pipeline (203), wherein the high-temperature nanofluid is water mixed with magnetic nanoparticles; A temperature sensor and a pressure sensor are provided in each drainage pipeline (204); the temperature sensor is electrically connected to a temperature sensor monitoring system (401); the pressure sensor is electrically connected to a pressure sensor monitoring system (402); acoustic emission probes (403) and integrated high-precision magnetic sensors are evenly distributed in the rock sample (102), and the acoustic emission probes (403) are electrically connected to an acoustic analyzer; The integrated high-precision magnetic sensor is electrically connected to the integrated high-precision magnetic sensor monitoring system (404); a magnetic field generating device (405) is installed outside the rigid pressure chamber (1); the direction of the magnetic field generated by the magnetic field generating device (405) is consistent with the direction of the target crack; The top outlet of the drainage pipeline (204) is connected to the oil, gas and water cooling separation system (5) via a condensation ring (501).

2. The simulation device for in-situ heat injection recovery of oil and gas from meter-scale large-size rocks according to claim 1 is characterized in that: A plurality of ring-shaped sealing packings (103) are arranged on the top surface of the sample to be tested.

3. The simulation device for in-situ heat injection recovery of oil and gas from meter-scale large-size rocks according to claim 2 is characterized in that: A plurality of circles of drilled holes (6) are arranged from the inside to the outside in an annular structure, and each circle of drilled holes (6) is located between two adjacent annular circles of sealing packing (103).

4. The simulation device for in-situ heat injection recovery of oil and gas from meter-scale large-size rocks according to claim 1 is characterized in that: The high-temperature nanofluid generating device comprises a boiler (201), a high-pressure water replenishment pump (202) and a water purification device.

5. The simulation device for in-situ heat injection recovery of oil and gas from meter-scale large-size rocks according to claim 1 is characterized in that: The magnetic nanoparticles are nanometer-scale ferroferric oxide, the particle size of ferroferric oxide is 15-25nm, and the mass percentage concentration in water is 4-6%.

6. The simulation device for in-situ heat injection recovery of oil and gas from large-scale rock of meter scale according to claim 1 is characterized in that: The pressure loading system comprises a press machine (301), a pressure transmission plate (302), and a spherical seat (303); the press machine (301) at the top of the pressure loading system is connected to the pressure transmission plate (302) via the spherical seat (303), and the pressure transmission plate (302) acts on the sample to be tested.

7. A simulation method for in-situ heat injection recovery of oil and gas from large-scale rock of meter scale, characterized in that: A simulation device for in-situ heat injection recovery of oil and gas in large-size rock of meter scale as described in any one of claims 1 to 6; and comprising the following steps: S1. Turn on the pressure loading system to apply an axial force to the test sample in the rigid pressure chamber (1); S2, turning on the high-temperature nanofluid generating device to generate high-temperature nanofluid, and when the temperature of the high-temperature nanofluid reaches the temperature required for the experiment, opening the valves on one or more selected nanofluid injection pipelines (203), so that the high-temperature nanofluid is injected into the pores of the rock sample (102) to heat the rock; S3, after heating for a period of time, closing the valve on the nanofluid injection pipeline (203), and then opening the valve on the corresponding drainage pipeline (204), and the oil and gas generated by the heating of the rock sample (102) will flow out to the oil-gas-water cooling separation system (5) through the opened pipeline; During the experiment, the data processing device collects the temperature and pressure change data in the drainage pipeline (204) in real time, and dynamically displays the three-dimensional temperature and pressure field distribution, analyzes the changes of temperature and pressure gradients over time, and combines the high-precision magnetic sensor monitoring system (404) and the magnetic field generating device (405) to control the flow path of the high-temperature nanofluid in the cracks; S4, replacing different nanofluid injection pipelines (203) and corresponding drainage pipelines (204), injecting high-temperature nanofluids and producing oil and gas, and repeating steps S2 and S3 to perform experiments and data collection.

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