Temperature control method for geothermal experiment cabin of deep geophysical mechanics test system

Abstract

The present application relates to a temperature control method for a geothermal experiment cabin of a deep geophysical mechanics test system, comprising the following steps: placing a sample to be tested in a heating cabin body, the heating cabin body being a hexahedral structure, the heating cabin body comprising six heating panels in different directions, and the heating panels being provided with electric heating elements; supplying power to the electric heating elements of the heating panels, and controlling the ambient temperature of the heating cabin body by controlling the current of the electric heating elements. The heating temperature of the heating panels is controllable within room temperature +10 DEG C to 600 DEG C, and the temperature uniformity is 1 DEG C to 5 DEG C. The present application provides an ambient temperature to keep the sample at a certain temperature, which is beneficial to the realization of the test of the mechanical behavior of reservoir rocks under a real-time high-temperature environment. The heating cabin used in the present application can be connected to a triaxial six-direction stress loading system or an elastic pressure cell, can transmit the loading force to the sample, and can provide a high-temperature environment for the sample, and is used in combination with the triaxial six-direction stress loading system, so that the test of the mechanical behavior of reservoir rocks under a real-time environment can be realized.

Description

Technical Field

[0001] This invention relates to the field of rock mechanical behavior testing technology, and in particular to a method for temperature control of a geothermal experimental chamber in a deep geophysical mechanical testing system. Background Technology

[0002] my country is currently in a stage of rapid industrialization and urbanization, leading to an increasing demand for resources, while shallow resources on Earth are gradually being depleted. Meanwhile, the deep earth, deep sea, and deep space contain vast amounts of resources and energy, and therefore, there is a growing trend of shifting resources towards deeper regions.

[0003] With the increasing demand for deep-earth energy, the requirements for various performance indicators of deep rocks are also becoming more stringent. Improving the accuracy of testing and ensuring that experimental data more accurately reflects the mechanical properties of materials in practical applications is particularly important, especially the mechanical properties at extremely high temperatures. However, many existing technologies cannot achieve real-time testing of the mechanical behavior of reservoir rocks under high-temperature conditions. A few mechanical testing systems merely use a heating plate at the indenter's front end to heat the sample, which is insufficient to simulate high-temperature environments. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, this application provides a temperature control method for the geothermal experimental chamber of a deep geophysical and mechanical testing system, which can maintain the sample at a certain temperature by providing an ambient temperature.

[0005] This application is achieved through the following technical solution: The temperature control method for the geothermal experimental chamber of the deep geophysical and mechanical testing system provided in this application includes the following steps: The test sample is placed inside the heating chamber, which has a hexahedral structure and includes heating panels in six directions, with electric heating elements installed inside the heating panels. The electric heating element of the heating panel is energized, and the ambient temperature of the heating chamber is controlled by controlling the current of the electric heating element.

[0006] Optionally, the heating temperature of the heating panel is controllable within the range of room temperature +10℃ to 600℃.

[0007] Optional, temperature uniformity 1℃-5℃.

[0008] Specifically, each heating panel is equipped with a docking head, which is installed in a through hole of one of the heating panels and can move axially relative to the heating chamber. The six docking heads are located in pairs in the X-axis, Y-axis, and Z-axis directions.

[0009] Optionally, the heating chamber also includes an integrally manufactured outer cubic frame, with six heating panels mounted on the six directions of the outer cubic frame; Each heating panel has an elastic plate on its outer side. The two ends of the elastic plate are movably connected to the outer cubic frame. The elastic plate and the heating panel have coaxial through holes. The mating head is installed in the through holes of the elastic plate and the heating panel and is fixedly connected to the elastic plate.

[0010] Optionally, the elastic plate has strip-shaped notches at both ends, and the outer cubic frame is fitted with matching screws at the positions corresponding to the strip-shaped notches. The two ends of the elastic plate are respectively secured to the screws through the strip-shaped notches.

[0011] Specifically, the elastic pressure box is operably placed inside the heating chamber. The elastic pressure box includes elastic sheets and 6 pressure heads. The 6 pressure heads are connected together by at least 8 highly elastic sheets to form a sample space for accommodating the sample. The sample to be tested is placed in the sample space, and each of the 6 pressure heads is docked with one of the docking pressure heads. The pressure head is equipped with a temperature sensor and / or a heat flow sensor.

[0012] Optionally, a heating plate is installed at the front end of at least one pressure head, and an electric heating element is installed inside the heating plate; by energizing the electric heating element of the heating plate, the corresponding side of the sample to be tested is heated.

[0013] Optionally, the heating temperature of the heating plate is controllable within the range of room temperature +10℃ to 600℃.

[0014] Compared with the prior art, this application has the following beneficial effects: 1. This application provides an ambient temperature to keep the sample at a certain temperature, which is conducive to realizing real-time testing of the mechanical behavior of reservoir rocks under high temperature environment; 2. The heating chamber used in the method of the present invention can be connected to a triaxial six-axis stress loading system or an elastic pressure box. It can transfer the force of the loading system to the sample and provide a high-temperature environment for the sample. When used with a triaxial six-axis stress loading system, it can realize the mechanical behavior test of reservoir rocks in real time and improve the accuracy of the test. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the embodiments of this application and form part of this application, do not constitute a limitation on the embodiments of the present invention.

[0016] Figure 1 This is a schematic diagram of the structure in which the test sample is placed inside the heating chamber in the embodiment; Figure 2 This is a three-dimensional diagram of the heating chamber in the embodiment. Figure 3 This is a front view of the temperature control method of the geothermal experimental chamber in the deep geophysical and mechanical testing system of the embodiment; Figure 4 yes Figure 3 Sectional view at point AA; Figure 5 yes Figure 3 Sectional view at point GG; Figure 6 This is a three-dimensional view of the outer cubic frame of the heating chamber in the embodiment; Figure 7 This is a three-dimensional view of the first type of heating panel in the embodiment; Figure 8 This is a three-dimensional view of the plate body of the first type of heating panel in the embodiment; Figure 9 This is a three-dimensional view of the elastic plate in the embodiment; Figure 10 This is a 3D view of the second type of heating panel in the embodiment; Figure 11 This is a three-dimensional view of the plate body of the second type of heating panel in the embodiment; Figure 12 This is a side view of the panel body of the second type of heating panel in the embodiment; Figure 13 This is a three-dimensional view of the elastic pressure box equipped with a displacement detection mechanism in the embodiment; Figure 14 This is a three-dimensional view of the elastic pressure box in the embodiment; Figure 15 This is a cross-sectional view of the elastic pressure box in the embodiment; Figure 16 This is a three-dimensional diagram of the displacement detection mechanism in the embodiment; Figure 17 This is a cross-sectional view of the elastic pressure box when a heating plate is mounted on at least one pressure head in the embodiment; Figure 18 This is a cross-sectional view of the pressure head connecting to the heating plate in the embodiment; Figure 19 This is a three-dimensional view of the heating plate in the embodiment. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. It should also be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0020] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] like Figures 1-4 As shown in this embodiment, the temperature control method for the geothermal experimental chamber of the deep geophysical and mechanical testing system includes the following steps: S, the test sample 10 is placed in the heating chamber 1. The heating chamber 1 has a hexahedral structure and includes heating panels 12 in 6 directions. The heating panels 12 are equipped with electric heating elements 31. S2, power is supplied to the electric heating element 31 of the heating panel 12, and the ambient temperature of the heating chamber 1 is controlled by controlling the current of the electric heating element 31.

[0023] During use, the ambient temperature of the chamber can be set according to experimental requirements. In one possible design, the heating temperature of the heating panel 12 can range from room temperature +10℃ to 600℃. Optionally, the temperature uniformity is 1℃-5℃. Specifically, the temperature uniformity is 3℃-5℃.

[0024] In one possible design, each heating panel 12 is provided with a docking head 2, which is installed in the through hole of one of the heating panels 12 and can move axially relative to the heating chamber 1. The six docking heads 2 are located in pairs in the X-axis, Y-axis and Z-axis directions.

[0025] It is worth noting that the three axes in this article refer to the X-axis, Y-axis, and Z-axis in a three-axis coordinate system. The six docking heads 2 are: two docking heads 2 symmetrically arranged in the X-axis direction, two docking heads 2 symmetrically arranged in the Y-axis direction, and two docking heads 2 symmetrically arranged in the Z-axis direction.

[0026] In one possible design, the inner end of the mating pressure head 2 is a cylindrical pressure rod 21, and the outer end is a ball head 22 that mates with the actuator pressure head.

[0027] In one possible design, such as Figures 2-6 As shown, the heating chamber 1 is integrally mounted from a high-rigidity outer cubic frame 11. The outer cubic frame 11 is manufactured as a single piece to ensure the stability of the overall system. Six heating panels 12 are connected to the outer cubic frame 11 by screws. The heating panels 12 have electrode covers 32 that are compatible with the electric heating elements 31. In particular, the electric heating elements 31 are resistance heating wires, which are embedded in the inner wall of the heating panels 12.

[0028] Six docking heads 2 are respectively installed in the center of one of the heating panels 12.

[0029] In one possible design, the heating panel 12 has the following two structures: The first type, such as Figure 2 , Figure 5 , Figure 7 , Figure 8 As shown, the heating panel 12 is integrally manufactured. An elastic plate 13 is located on the outer side of the heating panel 12. Both ends of the elastic plate 13 are movably connected to the outer cubic frame 11. The elastic plate 13 and the heating panel 12 have coaxial through holes. A mating pressure head 2 is installed in the through hole and is fixed to the elastic plate 13 by screws. A matching groove 120 is provided on the outer surface of the heating panel 12 corresponding to the position of the elastic plate 13, ensuring a gap between the elastic plate 13 and the outer surface of the heating panel 12 under normal conditions.

[0030] The second type, such as Figure 2 , Figure 5 , Figures 10-12As shown, the heating panel 12 is divided into three independently manufactured parts: a first plate 121, a second plate 122, and a third plate 123. The first plate 121, the second plate 122, and the third plate 123 are assembled together to form the heating panel 12. The second plate 122 is located between the first plate 121 and the third plate 123. The mating head 2 is mounted on the second plate 122. The first plate 121 and the third plate 123 are fixed to the outer cubic frame 11 by screws. The electric heating element 31 is mounted on the first plate 121 and the third plate 123. The first plate 121 and the third plate 123 are respectively equipped with electrode covers 32 that are compatible with the electric heating element 31.

[0031] The outer side of the second plate 122 has an elastic plate 13. Both ends of the elastic plate 13 are movably connected to the outer cubic frame 11. The elastic plate 13 and the second plate 122 have coaxial through holes. The mating head 2 is installed in the through holes and is fixedly connected to the elastic plate 13 and the second plate 122 by screws. In particular, the outer surface of the second plate 122 is lower than that of the first plate 121 and the second plate 122 to form a plate groove 120 that is adapted to the elastic plate 13. The elastic plate 13 is installed in the plate groove 120.

[0032] In one possible design, the second plate 122 has a T-shaped cross-section and slides with the first plate 121 and the third plate 123. The first plate 121 and the third plate 123 have limiting steps 124 to prevent the second plate 122 from sliding outward. The second plate 122 has steps on both sides that are adapted to the limiting steps 124. Under the action of external force, the second plate 122 can move inward relative to the first plate 121 and the third plate 123 to transmit pressure.

[0033] Optional, such as Figure 9 As shown, the elastic plate 13 has strip-shaped notches 131 at both ends. The outer cubic frame 11 is fitted with matching screws at the positions corresponding to the strip-shaped notches 131. The two ends of the elastic plate 13 are respectively secured to the screws through the strip-shaped notches 131.

[0034] It is worth noting that the heating panel should ideally be made of heat-insulating material.

[0035] It is worth noting that all six heating panels 12 of the heating chamber 1 may adopt the heating panel 12 of the first structure described above, or all of them may adopt the heating panel 12 of the second structure; or some may adopt the heating panel 12 of the first structure and some of them may adopt the heating panel 12 of the second structure.

[0036] In one possible design, such as Figure 1 As shown, the heating chamber 1 has an internal space for accommodating a pressure box. The resilient pressure box 4 is operably placed within the internal cavity of the heating chamber 1, as shown... Figures 13-15As shown, the elastic pressure box 4 includes elastic sheets 42 and 6 pressure heads 41. At least 8 highly elastic sheets 42 are used to connect the 6 pressure heads 41 together to form a sample space for accommodating the sample. The cubic test sample 10 is placed in the sample space of the elastic pressure box 4. The outer ends of the 6 pressure heads 41 are connected to the inner end of one of the mating pressure heads 2. The inner ends of the 6 pressure heads 41 can contact the 6 faces of the test sample 10 respectively.

[0037] To facilitate positioning and alignment, optionally, the pressure head 41 has a mating interface 411 in the center that is compatible with the mating pressure head 2.

[0038] The number of elastic sheets 42 is set reasonably according to needs. In one possible design, for example, 12 elastic sheets 42 are used to connect 6 pressure heads 41 together. Each pressure head 41 is connected to the four pressure heads 41 around its perimeter by an elastic sheet 42. The 12 elastic sheets 42 can assemble the 6 pressure heads 41 together, thereby achieving a tight fixation and fit between the pressure heads 41 and the test sample 10.

[0039] Optionally, the outer end of the pressure head 41 is provided with a spring plate groove, and the spring plate groove has two screw holes. The two ends of the elastic plate 42 are respectively placed in the spring plate groove and connected to the corresponding pressure head 41 by screws. Optionally, the elastic plate 42 is a highly elastic metal plate.

[0040] In one possible design, the indenter 41 is rectangular and contacts the sample surface, allowing pressure to be evenly transmitted to the sample. It is worth noting that the dimensions of the indenter 41 are appropriately set as needed. In another possible design, a cubic sample with a side length of 100 mm can be placed within the sample space.

[0041] In one possible design, each pressure head 41 is equipped with a high-temperature and high-pressure resistant temperature sensor and / or heat flow sensor at the middle position of its front end, which can realize real-time monitoring of the sample surface temperature and measurement of heat flow during the experiment.

[0042] Specifically, each pressure head 41 has a temperature and heat flow integrated probe embedded in its central hole. A thermal pad 410 is installed at the front end of the central hole of the pressure head 41, through which the sample temperature is transferred to the temperature and heat flow integrated probe inside the central hole.

[0043] In one possible design, such as Figure 13 As shown, displacement detection mechanisms 5 are respectively provided between the two pressure heads 41 in the X-axis direction, Y-axis direction, and Z-axis direction, which can realize the deformation monitoring of the sample in the X, Y, and Z directions.

[0044] In one possible design, such as Figure 16As shown, the displacement detection mechanism 5 includes a first connecting seat 51, a second connecting seat 52, a first lead-out straight rod 53, a second lead-out straight rod 54, a sensor mounting block 55, and a displacement sensor 56. The first lead-out straight rod 53 and the second lead-out straight rod 54 are parallel. One end of the first lead-out straight rod 53 is fixedly connected to the first connecting seat 51, and one end of the second lead-out straight rod 54 is fixedly connected to the second connecting seat 52. The other end of the first lead-out straight rod 53 is connected to the sensor mounting block 55. The displacement sensor 56 is mounted on the sensor mounting block 55. The other end of the second lead-out straight rod 54 is adapted to the detection end of the displacement sensor 56. The two can be connected or not connected. The first connecting seat 51 and the second connecting seat 52 are respectively mounted on two pressure heads 41 on the same shaft by screws. When the test sample 10 deforms, the two indenters 41 on the same axis undergo relative displacement, causing the first lead-out rod 53 and the second lead-out rod 54 to undergo relative displacement, which in turn causes the sensor mounting block 55 and the second lead-out rod 54 to undergo relative displacement. The displacement sensor 56, which is adapted to this displacement, can detect the amount of displacement and achieve deformation monitoring. The displacement sensor 56 can be led out to the outside of the heating chamber 1 through the first lead-out rod 53 and the second lead-out rod 54, which can realize real-time monitoring of sample deformation under high temperature environment, while avoiding the influence of the high temperature environment inside the heating chamber 1 on the displacement sensor 56.

[0045] If the displacement sensor 56 is a contact sensor, then the displacement sensor 56 is connected to or in contact with the other end of the second lead-out rod 54; if the displacement sensor 56 is a non-contact sensor, then the displacement sensor 56 and the other end of the second lead-out rod 54 are directly opposite each other, either in contact or not. The first connecting seat 51 and the second connecting seat 52 are mounted on the side of the pressure head 41. Specifically, to facilitate the passage of the second lead-out rod 54, the pressure head 41 at the corresponding position has a lead-out rod through hole 13. Taking the second lead-out rod 54 connected to the pressure head 41 in the X-axis direction as an example, its first lead-out rod 53 and second lead-out rod 54 are parallel to the X-axis direction, and the second lead-out rod 54 in the X-axis direction passes through the lead-out rod through hole 13 of the pressure head 41 in the Y-axis direction.

[0046] In one possible design, displacement sensor 56 is an LVDT sensor.

[0047] In one possible design, such as Figure 17 , Figure 18 As shown, a heating plate 6 is mounted on the front end of at least one indenter 41, and an electric heating element 31 is installed inside the heating plate 6. The heating plate 6 is rectangular and adapted to the indenter 41. The heating plate 6 is in contact with the sample surface and can uniformly transfer heat to the sample 10 to be tested.

[0048] In one possible design, the front end of the heating plate 6 is equipped with a high-temperature and high-pressure resistant temperature sensor and / or heat flow sensor, which can monitor the temperature of the sample surface in real time.

[0049] In one possible design, the heating plate 6 has a through hole in the center, a heat-conducting pad 410 is installed at the front end of the through hole, and a temperature and heat flow integrated probe is installed at the rear end of the through hole. The sample temperature is transferred to the temperature and heat flow integrated probe inside the central hole through the heat-conducting pad 410.

[0050] In one possible design, a heating plate 6 is installed only at the front end of the indenter 41 above the Z-axis. This plate can uniformly heat the upper part of the test sample 10 according to experimental requirements, with temperatures ranging from room temperature +10℃ to 600℃ and a temperature uniformity of 1℃-5℃. It is worth noting that the front end of the indenter 41 without the heating plate 6 is also equipped with a high-temperature and high-pressure resistant temperature sensor and / or heat flow sensor, which can monitor the sample surface temperature in real time. Specifically, a thermally conductive pad 410 is installed at the front end of the central hole of the indenter 41 without the heating plate 6, and a temperature and heat flow integrated probe is installed at the rear end of the through hole. The sample temperature is transferred to the temperature and heat flow integrated probe inside the central hole through the thermally conductive pad 410.

[0051] In one possible design, each of the six pressure heads 41 is equipped with a heating plate 6 at its front end. This ensures that the heating plate 6 is in contact with the test sample 10 in all six directions, achieving efficient and uniform transmission of pressure and temperature.

[0052] In one possible design, the electric heating element 31 is a resistance heating wire. Specifically, such as... Figure 18 , Figure 19 As shown, there is a serpentine groove 61 on the back of the heating plate 6 for mounting a resistance heating wire. The resistance heating wire is fixed in the serpentine groove 61 by multiple spaced ceramic rings 62, and the pressure head 41 is fastened to the back of the heating plate 6. The resistance heating wire passes through the ceramic rings 62 in sequence, and the ceramic rings 62 are locked in the serpentine groove 61, which can avoid direct contact between the resistance heating wire and the heating plate 6 and prevent local overheating.

[0053] In one possible design, the pressure head 41 and the heating plate 6 are made of a high-rigidity alloy material. The heating plate 6 is in contact with the pressure head 41, and the surface can be provided with a slot for alignment.

[0054] One method of use of this application is as follows: The deep geothermal experimental chamber is placed in the loading frame of the triaxial six-axis stress loading system. A hydraulic actuator is provided in each of the six directions of the loading frame. The output end of the six hydraulic actuators has a ball-and-socket pressure head adapted to the ball head 22. The six hydraulic actuators are respectively connected to the outer ends of the six docking pressure heads 2. The inner ends of the six docking pressure heads 2 are respectively connected to the outer ends of the six pressure heads 41. The inner ends of the six pressure heads 41 are respectively in contact with the six surfaces of the sample 10 to be tested. The electric heating element 31 of the heating panel 12 is energized, and the heating temperature of the heating chamber 1 is controlled by controlling the current of the electric heating element 31, thereby heating the entire chamber and raising the temperature of the test sample 10 inside the heating chamber 1; then the heating plate 6 on the pressure head 41 is used to locally heat the sample 10 on one side, thereby achieving a temperature difference between the two sides of the sample, and the thermal conductivity can be measured through this temperature difference.

[0055] In the stress loading experiment, a hydraulic actuator applies the load, transmitting pressure to pressure head 41 via the docking pressure head 2, and then pressure head 41 uniformly transmits the force to the test sample 10. This application can provide the test sample with ambient temperature, facilitating real-time testing of reservoir rock mechanical behavior under high-temperature conditions.

[0056] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A temperature control method for a deep geothermal environment mechanical testing system, characterized in that: Includes the following steps: The test sample (10) is placed inside the heating chamber (1), which is a hexahedral structure. The heating chamber (1) includes heating panels (12) in 6 directions, and electric heating elements (31) are installed inside the heating panels (12). Power is supplied to the electric heating element (31) of the heating panel (12), and the ambient temperature of the heating chamber (1) is controlled by controlling the current of the electric heating element (31); Each heating panel (12) is provided with a docking head (2). The docking head (2) is installed in the through hole of one of the heating panels (12) and can move axially relative to the heating chamber (1). The six docking heads (2) are located in pairs in the X-axis, Y-axis and Z-axis directions. The heating chamber (1) also includes an outer cubic frame (11), and six heating panels (12) are respectively installed in six directions of the outer cubic frame (11); The heating panel (12) is divided into three independently manufactured parts: a first plate (121), a second plate (122), and a third plate (123). The first plate (121), the second plate (122), and the third plate (123) are assembled together to form the heating panel (12). The second plate (122) is located between the first plate (121) and the third plate (123). The mating head (2) is mounted on the second plate (122). The first plate (121) and the third plate (123) are fixedly connected to the outer cubic frame (11). The electric heating element (31) is mounted on the first plate (121) and the third plate (123). The first plate (121) and the third plate (123) are respectively equipped with electrode covers (32) that are compatible with the electric heating element (31). The second plate (122) has an elastic plate (13) on its outer side. The two ends of the elastic plate (13) are movably connected to the outer cubic frame (11). The elastic plate (13) and the second plate (122) have coaxial through holes. The mating head (2) is installed in the through hole. The mating head (2) is fixed together with the elastic plate (13) and the second plate (122) by screws. The outer surface of the second plate (122) is lower than the first plate (121) and the second plate (122) to form a plate groove (120) that is compatible with the elastic plate (13). The elastic plate (13) is installed in the plate groove (120).

2. The temperature control method for the deep geothermal environment mechanical testing system according to claim 1, characterized in that: The heating temperature of the heating panel (12) is controllable within the range of room temperature +10℃ to 600℃.

3. The temperature control method for the deep geothermal environment mechanical testing system according to claim 1, characterized in that: Temperature uniformity: 1℃-5℃.

4. The temperature control method for the deep geothermal environment mechanical testing system according to claim 1, characterized in that: The elastic plate (13) has strip-shaped notches (131) at both ends. The outer cubic frame (11) is fitted with matching screws at the positions corresponding to the strip-shaped notches (131). The two ends of the elastic plate (13) are respectively secured to the screws through the strip-shaped notches (131).

5. The temperature control method for the deep geothermal environment mechanical testing system according to claim 1, characterized in that: The elastic pressure box (4) is operably placed inside the heating chamber (1). The elastic pressure box (4) includes an elastic sheet (42) and six pressure heads (41). The six pressure heads (41) are connected together by at least eight highly elastic elastic sheets (42) to form a sample space for accommodating the sample. The sample to be tested (10) is placed in the sample space, and the six pressure heads (41) are respectively connected to one of the docking pressure heads (2). The pressure head (41) is equipped with a temperature sensor and / or a heat flow sensor.

6. The temperature control method for the deep geothermal environment mechanical testing system according to claim 5, characterized in that: A heating plate (6) is installed at the front end of at least one pressure head (41), and an electric heating element (31) is installed inside the heating plate (6). By energizing the electric heating element (31) of the heating plate (6), the corresponding side of the test sample (10) is heated.

7. The temperature control method for the deep geothermal environment mechanical testing system according to claim 6, characterized in that: The heating temperature of the heating plate (6) is controllable within the range of room temperature +10℃ to 600℃.

8. The temperature control method for the deep geothermal environment mechanical testing system according to any one of claims 1-7, characterized in that: The electric heating element (31) is an electric heating wire.

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