An ultrahigh temperature and high pressure rock sample testing device, system and method

Abstract

The application provides an ultrahigh-temperature and high-pressure rock sample testing device, system and method, which comprises a heating assembly and a pressurizing assembly, the heating assembly has a heating cavity for accommodating a rock sample, the rock sample is tightly attached to a heating part of the heating assembly, and the pressurizing assembly clamps and applies pressure to the rock sample; so that the rock sample can quickly complete ultrahigh-temperature testing in a high-pressure environment. Based on the technical scheme of the application, the device can quickly reach a high-temperature and high-pressure environment required for testing, the testing efficiency is improved, the testing device is completely accommodated in a high-pressure equipment, a graphite tube beside the testing sample is directly heated, a deep high-temperature and high-pressure environment is perfectly simulated, and the reliability of testing data is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rock physics testing, in particular to an ultrahigh temperature and high pressure rock sample testing device, system and method. BACKGROUND

[0002] With the main target of oil and gas exploration turning from structural oil and gas reservoirs to lithologic and subtle oil and gas reservoirs, in the face of increasingly high accuracy requirements of oil and gas reservoir prediction, it is increasingly important to carry out rock physics experimental research on deep rock. The focus of China's energy exploration and development gradually shifts to deep layers, and reservoir prediction and description has become the focus and difficulty of the work. Due to the superimposition and interaction of multiple factors such as old formation age, deep burial, ultrahigh temperature, ultrahigh pressure, and complex rock skeleton in deep layers, the rock physical properties and fluid phase state characteristics of the formation under deep high temperature and high pressure conditions are not yet clear, and the research results play an important role in carrying out rock physics multi-parameter modeling, guiding deep reservoir prediction, and improving exploration and development efficiency.

[0003] However, the high temperature and high pressure data of general rock physics come from geophysical logging data and geophysical experiments. In the deep ultrahigh temperature and high pressure environment, logging instruments cannot measure, and in the laboratory, the heating method is generally to heat from the outside of the loading cavity, heat layer by layer to the sample through heat conduction, and the heating and cooling time is very long, generally several hours, which is very low in experimental efficiency and time-consuming and laborious. SUMMARY

[0004] In view of the problems in the prior art, the present application provides an ultrahigh temperature and high pressure rock sample testing device, system and method, which can provide an efficient and stable experimental environment for deep rock physics testing by directly heating the sample through the graphite furnace.

[0005] The ultrahigh temperature and high pressure rock sample testing device of the present application comprises a heating assembly and a pressurizing assembly, the heating assembly has a heating cavity for accommodating a rock sample, the rock sample is tightly attached to a heating part of the heating assembly, and the pressurizing assembly clamps the rock sample and applies pressure thereto; so that the rock sample can quickly complete the ultrahigh temperature test in a high pressure environment.

[0006] In one embodiment, the heating part is a graphite tube, and the heating assembly further comprises an electrically conductive assembly connected to the graphite tube; the rock sample is located in the middle part of the graphite tube, and through this embodiment, the graphite tube completely accommodates the rock sample, and after the graphite tube is powered on, the temperature can be quickly raised to above 400℃, and after the test is completed, the temperature of the graphite tube can be quickly reduced to room temperature within a few minutes after the external power supply system is cut off, thereby realizing efficient testing of the rock sample.

[0007] In one embodiment, further comprising an outer sheath, the heating assembly is arranged in the outer sheath; the outer sheath comprises compression-resistant sections at both ends and a talc sheath section between the compression-resistant sections, the talc sheath section is in contact with the graphite tube, and a temperature probe is further arranged in the talc sheath section and closely attached to the graphite tube. Through this embodiment, the heating assembly, the pressurizing assembly, and the rock sample are fixed by the arranged outer sheath section, and the compression-resistant sections arranged at the same time can improve the compression resistance during the test to avoid damage to each component. The temperature probe monitors and records the temperature of the heating assembly in real time, and at the same time, the temperature probe is directly sleeved on the heating assembly and separates the compression-resistant piece into two layers, i.e. the temperature probe can be stably arranged in the compression-resistant piece, which improves the accurate data parameters for test analysis.

[0008] In one embodiment, the pressurizing assembly comprises two bearing tables for clamping the rock sample, and two bearing tables are further provided with transducers for testing the rock sample on the side away from the rock sample. Both bearing tables are closely attached to the inner wall of the heating cavity. Through this embodiment, the sample rock is clamped by the bearing table, which can provide compression resistance during pressurization. The transducer arranged can test the sample rock ultrasonically to obtain the seismic elastic parameters of the sample rock under ultrahigh temperature and high pressure environment. At the same time, there is no gap between the bearing table and the heating assembly, which improves the stability of the test.

[0009] In one embodiment, the pressurizing assembly further comprises a pressure head arranged outside any of the transducers, which simultaneously acts on the outer sheath and the transducer corresponding to the pressure head. Through this embodiment, the pressure head can uniformly apply pressure to the test device.

[0010] In one embodiment, the contact surface between the graphite tube and the rock sample is further provided with a heat concentrating component for concentrating the heat of the graphite tube on the rock sample. Through this embodiment, the heat concentrating component is arranged to be in contact with the heating assembly and the rock sample respectively, which reduces the heat loss of the graphite tube, thereby speeding up the test heating process and improving the experimental efficiency.

[0011] In one embodiment, the bottom of the pressure head is further provided with a gasket to enable the pressure head to uniformly apply pressure to the rock sample. Through this embodiment, the bottom of the pressure head is further provided with a gasket, so that the pressure head can have a cylindrical structure, thereby uniformly applying pressure to the rock sample and improving the stability of the pressure head during operation.

[0012] In one embodiment, the conductive assembly comprises at least one conductive copper sleeve and a conductive copper ring connected with an external power supply device, the conductive copper sleeve has the same outer diameter as the graphite tube and the end faces of the two are in contact with each other, and the conductive copper sleeve and the graphite tube combine to form the heating cavity, through this embodiment, the conductive copper sleeve and the graphite tube with the same outer diameter form an electric circuit, and under the action of the external power supply device through the conductive copper ring, the graphite tube located in the middle can generate a large amount of heat in a short time under the operation of a high current due to its large self-resistance and thin wall, so that the test device can quickly provide an ultrahigh temperature environment.

[0013] The application further provides an ultrahigh-temperature and high-pressure rock sample test system comprising at least one ultrahigh-temperature and high-pressure rock sample test device as described above, and further comprising:

[0014] a high-pressure loading device comprising a pressure applying device and a high-pressure cavity, the test device being installed in a limiting groove in the high-pressure cavity, and the pressure applying device driving a pressure applying assembly to apply pressure to the rock sample;

[0015] a cooling device comprising a water cooling pipe and a water circulation heat exchange device, the water cooling pipe being arranged in the high-pressure cavity and being in contact with the test device, and the water circulation heat exchange device being arranged outside the high-pressure cavity to control the temperature of the test device.

[0016] The application further provides a test method based on the ultrahigh-temperature and high-pressure rock sample test system as described above, comprising the following steps:

[0017] S1, clamping the rock sample in the heating cavity of the test device;

[0018] S2, starting the pressure applying device to apply a predetermined amount of pressure to the rock sample through the pressure applying assembly.

[0019] S3, maintaining stable pressure, starting the power supply device to provide external current for the work of the heating assembly, and starting the cooling device to set the temperature of the water circulation heat exchange device to avoid continuous temperature rise of the heating assembly;

[0020] S4, starting the transducer to test the performance of the rock sample and record the physical data of the rock sample at different temperatures;

[0021] S5, fitting the function of the rock sample with respect to temperature and pressure according to the experimental results.

[0022] The above technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the application can be achieved.

[0023] The application provides an ultrahigh-temperature and high-pressure rock sample testing device, system and method.

[0024] (1) The high-temperature and high-pressure environment required for testing can be quickly reached, and the testing equipment can be quickly recovered for next time testing, so that the testing efficiency is obviously improved.

[0025] (2) The high-pressure equipment is used to provide a high-pressure environment for the testing sample, the testing device is completely contained in the high-pressure equipment, and the graphite tube beside the testing sample is directly heated, so that the deep high-temperature and high-pressure environment is truly simulated, and the reliability of the testing data is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0026] Hereinafter, the application will be described in more detail based on the embodiments and with reference to the drawings. In which:

[0027] Figure 1 A testing device structure schematic view of the application is shown;

[0028] Figure 2 A testing process data acquisition view of one embodiment of the application is shown

[0029] Figure 3 A testing result fitting curve of one embodiment of the application is shown;

[0030] In the drawings, the same parts are marked with the same reference numerals. The drawings are not in actual proportion.

[0031] Reference numerals:

[0032] 1, pressure-resistant part; 2, pyrophyllite outer sleeve; 3, graphite tube; 4, conductive copper ring; 5, conductive copper ring; 6, heat collecting part; 7, first transducer; 8, bearing table; 9, temperature probe; 10, wiring channel; 11, pyrophyllite column; 12, lead pad; 13, outer triangular sealing ring; 14, inner triangular sealing ring; 15, testing sample; 16, pressure head; 17, second transducer. DETAILED DESCRIPTION

[0033] The application will be further described below with reference to the drawings.

[0034] Example 1

[0035] The application provides an ultrahigh-temperature and high-pressure rock sample testing device, which comprises a heating assembly and a pressurizing assembly, and the pressurizing assembly clamps the rock sample in the heating assembly; a heat gathering component is arranged between the heating assembly and the pressurizing assembly; the heat gathering component is tightly attached to the heating assembly; the heating assembly and the rock sample are combined into a cylindrical structure, so that the heat gathering component is simultaneously attached to the pressurizing assembly and the rock sample; the rock sample can quickly complete ultrahigh-temperature heating test in a high-pressure environment; the rock sample is clamped in the heating assembly by the pressurizing assembly, and the heating assembly and the rock sample are simultaneously provided with a high-temperature and high-pressure environment; the heat gathering component is attached to the heating assembly and the rock sample respectively, and the whole forms a cylindrical structure, so that heat loss is reduced, the temperature rising process is accelerated, and the experimental efficiency is improved.

[0036] Specifically, the heating assembly comprises a graphite tube and an electrically conductive assembly connected with the graphite tube; the rock sample is located in the middle of the graphite tube, and the heat gathering component is attached to the graphite tube and the rock sample respectively; after the graphite tube is electrified, the temperature can be quickly raised to above 400 DEG C, and after the test is completed, the temperature of the graphite tube can be quickly reduced to room temperature in a few minutes after the external power supply system is cut off, so that efficient testing of the rock sample is realized.

[0037] It should be noted that the ultrahigh-temperature and high-pressure rock sample testing device further comprises an outer sheath, and the heating assembly is arranged in the outer sheath; the outer sheath comprises compression-resistant sections at two ends and a pyrophyllite sheath section between the compression-resistant sections, and the pyrophyllite sheath section is attached to the graphite tube; the outer sheath is arranged to fix the heating assembly, the pressurizing assembly and the rock sample, and the filled compression-resistant components can improve the compression resistance during the test, so that damage of the components is avoided.

[0038] Specifically, the pressurizing assembly comprises a bearing table for clamping the rock sample, and a first transducer and a second transducer for rock sample testing are further arranged on the two sides of the bearing table respectively; the first transducer is tightly attached to the heating assembly, and the second transducer is tightly attached to the outer sheath and the heating assembly respectively; the bearing table is arranged to clamp the sample rock, and the compression resistance can be provided during the pressurizing process; the first transducer and the second transducer arranged on the two sides of the bearing table perform ultrasonic testing on the sample rock, so as to obtain the seismic elastic parameters of the sample rock in the ultrahigh-temperature and high-pressure environment; and there is no gap between the bearing table, the transducers and the heating assembly, so that the stability of the test is improved.

[0039] Specifically, the pressing assembly further comprises a pressure head arranged above the first transducer, and a buffer compensation assembly is further arranged between the pressure head and the first transducer, and the bottom surface of the pressure head is attached to the end surface of the buffer compensation assembly, so as to ensure that the pressure head can uniformly act on the buffer compensation assembly, and since there is a certain height difference among the heating assembly, the first transducer and the outer sheath, in order to enable the testing device to remain stable during the action of the pressure head, the buffer compensation assembly is arranged between the pressure head and the first transducer, so that the pressure head can stably apply pressure to the rock sample.

[0040] Specifically, the heating assembly is further sleeved with a temperature probe; the temperature probe is attached to the outer sheath, and the temperature probe divides the pressure-resistant part into two layers; the temperature probe monitors and records the temperature of the heating assembly in real time, and the temperature probe is directly sleeved on the heating assembly and separates the pressure-resistant part into two layers, that is, the temperature probe can be stably arranged in the pressure-resistant part, so as to improve the accurate data parameters for testing and analysis.

[0041] It should be noted that the transmission pipeline of the temperature probe passes through the outer sheath and is connected with an external data receiving device.

[0042] Specifically, the conductive assembly comprises a conductive copper sleeve and a conductive copper ring connected with an external power supply device, the conductive copper sleeve has the same outer diameter as the graphite pipe and the end surfaces of the two are in contact with each other, the conductive copper sleeve and the graphite pipe are combined into a heating cavity, the conductive copper sleeve and the graphite pipe with the same outer diameter form a circuit, and under the action of the external power supply device through the conductive copper ring, the graphite pipe located in the middle generates a large amount of heat in a short time under the operation of high current due to its large self-resistance and thin wall, so that the testing device can quickly provide an ultrahigh temperature environment.

[0043] Embodiment 2

[0044] As shown in Figure 1 The present application provides an ultrahigh temperature and high pressure rock sample testing device, which comprises a heating assembly and a pressing assembly, and the pressing assembly clamps the rock sample in the heating assembly; a heat collecting part 6 is arranged between the heating assembly and the pressing assembly; the heat collecting part 6 is attached to the heating assembly; the heating assembly and the rock sample 15 are combined into a cylindrical structure, so that the heat collecting part 6 is attached to the pressing assembly and the rock sample 15 at the same time; the rock sample 15 can quickly complete the ultrahigh temperature heating test in a high pressure environment; the rock sample is clamped in the heating assembly by the pressing assembly, and a high temperature and high pressure environment is provided for the rock sample at the same time, the heat collecting part 6 is attached to the heating assembly and the rock sample respectively, and the whole forms a cylindrical structure, so as to reduce the heat loss and accelerate the heating process, thereby improving the experimental efficiency.

[0045] It should be noted that the heat collecting component 6 is a thin-walled cylindrical structure, and the heat collecting component is made of pyrophyllite. Since pyrophyllite has poor thermal conductivity, it can collect the heat generated by the heating component to act on the rock sample 15, thereby improving the efficiency of the test. At the same time, since it is fragile during the processing, Figure 1 As described above, the heat collecting component 6 is composed of an upper and a lower part. If it is directly processed into the length of the cavity, the yield rate is low and it is easy to be damaged during the assembly process.

[0046] Specifically, the heating component includes a graphite tube 3 and a conductive component connected to the graphite tube; the rock sample 15 is located in the middle of the graphite tube 3, and the heat collecting component 6 is respectively attached to the graphite tube 3 and the rock sample 15. The graphite tube 3 completely accommodates the rock sample 15. After the graphite tube 3 is energized, the temperature can be quickly raised to above 400°C. After the test is completed, after the external power supply system is cut off, the temperature of the graphite tube 3 can be quickly reduced to room temperature within a few minutes, thereby realizing efficient testing of the rock sample.

[0047] It should be noted that in the laboratory, for measuring ultra-high temperature and high pressure data, the heating method is generally to heat from the outside of the loading cavity, and heat the sample layer by layer through heat conduction. The heating time is very long, and the cooling time is also very long, generally taking more than ten hours, which is too inefficient. Using the graphite tube 3 to directly heat the rock sample 15 not only greatly improves the test efficiency, generally completing it in more than ten minutes, but also more realistically simulates the deep high temperature environment, thereby improving the accuracy and authenticity of the test experiment.

[0048] like Figure 1 As shown, the test device further includes an outer sheath, which wraps the heating component.

[0049] Specifically, the outer sheath includes a talc outer jacket 2 that is fitted with the graphite tube and pressure-resistant parts 1 located on both sides of the talc outer jacket 2. The heating component, the pressurizing component and the rock sample 15 are fixed by the provided outer sheath. At the same time, the provided pressure-resistant parts 1 can improve the compressive strength during the test and avoid damage to the components.

[0050] It should be noted that the compression member 1 is made of alumina, which improves the compression strength of the entire test device during the test.

[0051] Specifically, the pressurizing assembly comprises a bearing table 8 for clamping the rock sample, and a first transducer 7 and a second transducer 17 are arranged on both sides of the bearing table 8 respectively for testing the rock sample 15. The first transducer 7 and the second transducer 17 are tightly attached to the heating assembly. By arranging the bearing table 8 to clamp the sample rock 15, the compressive strength can be provided during the pressurizing process. The first transducer 7 and the second transducer 17 arranged on both sides of the bearing table 8 are used for ultrasonic testing of the sample rock 15 to obtain the seismic elastic parameters of the sample rock 15 under the ultrahigh temperature and high pressure environment. Meanwhile, there is no gap between the bearing table 8, the transducer and the heating assembly, thereby improving the stability of the testing.

[0052] Specifically, as shown in Figure 1 , the first transducer 7 and the second transducer 17 are both provided with a wiring channel 10 to transmit the testing data to the external receiving device in real time during the ultrasonic testing of the sample rock 15.

[0053] Specifically, as shown in Figure 1 , the wiring channel 10 has a T-shaped structure. In order to protect the wires in the wiring channel 10 from being damaged, the wiring channel 10 is made of a steel pipe.

[0054] It should be noted that, as shown in Figure 1 , the pressurizing assembly has a cylindrical structure. The heat gathering part 6, the heating assembly and the compression-resistant part are sequentially sleeved on the pressurizing assembly from inside to outside and accommodated in the outer sheath to form the cylindrical structure. There is no gap between the components in the outer sheath, which avoids the influence of the closure or expansion of pores and cracks on the testing experiment.

[0055] It should be further noted that the bearing table 8 is made of corundum column to provide compressive strength for the testing device. As shown in Figure 1 , the bearing table 8 is divided into upper and lower parts to clamp the sample rock 15. The sample rock 15 has the same outer diameter as the bearing table 8. When the heat gathering part 6 is sleeved on the pressurizing assembly, it can simultaneously adhere to the sample rock 15 and the bearing table 8 to minimize the heat loss of the heating assembly, improve the testing efficiency and ensure higher stability of the testing device during the pressurizing process.

[0056] Specifically, the pressurizing assembly further comprises a pressure head 16 arranged above the first transducer 7. A buffer compensation assembly is arranged between the pressure head 16 and the first transducer 7. The bottom surface of the pressure head 16 is tightly attached to the end surface of the buffer compensation assembly to ensure that the pressure head 16 can uniformly act on the buffer compensation assembly.

[0057] It should be noted that due to the height difference between the heating assembly, the first transducer 7 and the outer sheath, in order to keep the testing device stable during the action of the pressure head 16, a buffer compensation assembly is arranged between the pressure head 16 and the first transducer 7, so that the pressure head 16 can stably apply pressure to the rock sample.

[0058] Specifically, as shown in Figure 1 The buffer compensation assembly includes a tourmaline column 11 and a lead pad 12. The tourmaline column 11 is arranged on the wiring channel 10 and is in close contact with the heating assembly. The end face of the tourmaline column 11 is coplanar with the end face of the heating assembly to form a complete plane. The lead pad 12 is installed on the tourmaline column 11 and is in close contact with the inner wall of the outer sheath 17. Since the tourmaline column 11 and the lead pad 12 are not rigid materials, they can make the overall testing device more balanced under the action of the pressure head 16, thereby improving the accuracy of the test experiment.

[0059] Specifically, as shown in Figure 1 The heating assembly is further sleeved with a temperature probe 9. The temperature probe 9 is in close contact with the outer sheath and divides the compression-resistant piece 1 into two layers. The temperature probe 9 monitors and records the temperature of the heating assembly in real time. The temperature probe 9 is directly sleeved on the heating assembly and separates the compression-resistant piece into two layers. The temperature probe can be stably arranged in the compression-resistant piece, thereby providing accurate data parameters for test analysis.

[0060] It should be noted that the temperature probe 9 is sleeved on the heating assembly through the tourmaline sleeve 2, that is, as shown in Figure 1 The measuring end of the temperature probe 9 penetrates through the tourmaline sleeve 2 and directly contacts the graphite tube 3. The other end penetrates through the outer sheath and is connected with an external data receiving device to transmit temperature information in real time.

[0061] As a preferred embodiment, the bottom of the pressure head 16 is further wrapped with a triangular sealing ring. The triangular sealing ring and the pressure head 16 form a cylindrical structure, so that the pressure head 16 is completely fitted on the buffer compensation assembly.

[0062] Specifically, the triangular sealing ring is made of metal copper and includes an outer triangular sealing ring 13 and an inner triangular sealing ring 14.

[0063] It should be noted that, as shown in Figure 1As shown, due to the arc-shaped part at the bottom of the pressure head 16, the pressure head 16 cannot be completely attached to the buffer compensation assembly, so that a gap exists between the pressure head 16, the outer sheath and the buffer compensation assembly, and when the pressure head 16 exerts pressure, a certain deflection may occur due to the gap, which affects the accuracy of the experiment. By wrapping the triangular sealing ring at the bottom of the pressure head 16, the gap between the pressure head 16, the outer sheath and the buffer compensation assembly can be filled, and the stability of the pressure head 16 during operation is further improved.

[0064] Specifically, the conductive assembly includes a conductive copper sleeve 4 and a conductive copper ring 5 connected to an external power supply device, and the conductive copper sleeve 4 has the same outer diameter as the graphite pipe 3, and the conductive copper sleeve 4 is sleeved on the heat aggregation component 6.

[0065] As a preferred embodiment, the number of conductive copper sleeves 4 is two, and the two conductive copper sleeves 4 clamp the graphite pipe 3, so that the graphite pipe 3 can quickly release heat after being electrified.

[0066] It should be noted that, as Figure 1 As shown, the conductive copper sleeve 4 and the graphite pipe 3 with the same outer diameter form part of the circuit, and under the action of the conductive copper ring 5 of the external power supply device, the graphite pipe 3 located in the middle can generate a large amount of heat in a short time under the operation of a high current due to its large resistance and thin wall, so that the test device can quickly provide an ultrahigh temperature environment.

[0067] Example 3

[0068] The application also provides an ultrahigh-temperature and high-pressure rock sample test system, which comprises:

[0069] The high-pressure loading device comprises a pressure applying device and a high-pressure cavity, the test device is installed in a limiting groove in the high-pressure cavity, and the pressure applying device drives the pressure applying assembly to apply pressure to the rock sample;

[0070] The power supply device is connected to the test device to provide an external current for the test device to generate a high-temperature environment.

[0071] The cooling device comprises a water cooling pipe and a water circulation heat exchange device to control the temperature of the test device.

[0072] Specifically, the test device and the water cooling pipe are arranged in the high-pressure cavity, the water cooling pipe is in contact with the test device, and the water circulation heat exchange device is arranged outside the high-pressure cavity.

[0073] It should be noted that the pressure applying device pressurizes the test device in the high-pressure cavity through the pressure transmission medium to provide a high-pressure environment for the test sample, and the high-pressure loading device is a prior art known to those skilled in the art, and appropriate models can be selected as needed, and details are not described herein; the rated temperature is set in the water circulation heat exchange device, and since the graphite tube continuously generates heat in the energized state, when the environmental temperature of the rock sample reaches the rated temperature, the water-cooled tube absorbs the heat generated by the graphite tube to maintain the rated temperature of the rock sample environment, and the specific model of the water circulation heat exchange device can be selected as needed.

[0074] Embodiment 4

[0075] The application also provides a test method based on the above-mentioned ultrahigh-temperature and high-pressure rock sample test system, comprising the following steps:

[0076] S1, clamping the rock sample in the heating cavity of the test device;

[0077] S2, starting the pressure applying device to apply a predetermined size of pressure to the rock sample through the pressure applying assembly.

[0078] S3, maintaining stable pressure, starting the power supply device to provide external current for the heating assembly to work, and starting the cooling device to set the temperature of the water circulation heat exchange device to avoid continuous temperature rise of the heating assembly;

[0079] S4, starting the transducer to test the performance of the rock sample and record the physical data of the rock sample at different temperatures;

[0080] S5, fitting the function of the rock sample with respect to temperature and pressure according to the experimental results.

[0081] It should be noted that the steps of assembling the test device and clamping the rock sample are as follows:

[0082] As shown in Figure 1 , the second transducer 17 is arranged in the groove, the carrier table 8 is placed on the second transducer 17, the rock sample 15 is located in the middle of the carrier table 8, the first transducer 7 and the wire channel 10 are sequentially placed on the top of the carrier table 8, the heat concentrating part 6 and the heating assembly are sequentially sleeved on the carrier table 8 from inside to outside and in contact with the bottom, the compression-resistant part 1 is filled in the gap between the heating assembly and the outer sheath, the compression-resistant part 1 is divided into upper and lower parts, the talcstone sleeve 2 is placed in the middle of the compression-resistant part 1 during the filling process, and the temperature probe 9 is in direct contact with the graphite tube 3 through the talcstone sleeve 2, and the wire of the temperature probe 9 is connected with the external data receiving device through the outer sheath 9, the talcstone column 11 and the lead pad 12 are sequentially placed on the heating assembly, and finally the pressure head 16 is placed on the lead pad 12, and the triangular sealing ring is sleeved on the bottom of the pressure head 16 during the placement process.

[0083] It should be noted that the carbonate reservoir rock is used as the rock sample 15 for testing, and the first transducer 7 and the second transducer 17 are used to perform ultrasonic testing on the rock sample in a high temperature and high pressure environment, and the collected data is as shown in Figure 2 .

[0084] Further, according to the test results, the function of the elastic wave velocity of the rock sample 15 with temperature and pressure is fitted as shown in Figure 3 . It can be found that the elastic wave velocity of the rock decays with the inverse of pressure and temperature.

[0085] The above technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the application can be achieved.

[0086] In the description of the present application, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inner", "outer", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0087] Although the present application is described herein with reference to particular embodiments, it should be understood that these examples are merely illustrative of the principles and applications of the present application. It should therefore be understood that numerous modifications can be made to the exemplary embodiments, and that other arrangements can be devised without departing from the spirit and scope of the present application as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways other than those described. It should also be understood that features described in relation to one embodiment can be used in other described embodiments.

Claims

1. An ultra-high temperature and high pressure rock sample testing device, characterized in that: The device comprises a heating assembly and a pressurizing assembly, wherein the heating assembly has a heating chamber for accommodating a rock sample, the rock sample is closely attached to the heating portion of the heating assembly, and the pressurizing assembly clamps the rock sample and applies pressure thereto, so that the rock sample can quickly complete ultra-high temperature testing in a high-pressure environment; The heating portion is a graphite tube, and the heating assembly further includes a conductive assembly connected to the graphite tube; the rock sample is located in the middle of the graphite tube; a heat collecting component is further provided on the contact surface between the graphite tube and the rock sample to concentrate the heat of the graphite tube on the rock sample; The device further comprises an outer sheath, wherein the heating assembly is disposed in the outer sheath; the outer sheath comprises pressure-resistant sections at both ends and a pyrophyllite outer sheath section between the pressure-resistant sections, wherein the pyrophyllite outer sheath section is in contact with the graphite tube, and a temperature probe in close contact with the graphite tube is further disposed in the pyrophyllite outer sheath section; The pressurizing assembly includes two supporting platforms for clamping the rock sample. A transducer for testing the rock sample is also provided on the side of the two supporting platforms away from the rock sample. Both the supporting platforms are closely attached to the inner wall of the heating chamber.

2. The ultra-high temperature and high pressure rock sample testing device according to claim 1, characterized in that: The pressurizing assembly further includes a pressure head, which is arranged on the outside of any one of the transducers. The pressure head acts on the outer sheath and the transducer corresponding to the pressure head at the same time.

3. The ultra-high temperature and high pressure rock sample testing device according to claim 2, characterized in that: A gasket is also provided at the bottom of the pressure head so that the pressure head can apply uniform pressure to the rock sample.

4. The ultra-high temperature and high pressure rock sample testing device according to claim 1, characterized in that: The conductive component includes at least one conductive copper sleeve and a conductive copper ring connected to an external power supply device. The conductive copper sleeve has the same outer diameter as the graphite tube and their end faces are in contact with each other. The conductive copper sleeve and the graphite tube are combined to form the heating chamber.

5. An ultra-high temperature and high pressure rock sample testing system, characterized in that: The ultra-high temperature and high pressure rock sample testing device according to any one of claims 1 to 4 further comprises: The high-pressure loading device includes a pressure-applying device and a high-pressure chamber. The testing device is installed in a limiting groove in the high-pressure chamber. The pressure-applying device drives the pressure-applying assembly to apply pressure to the rock sample. The cooling device includes a water-cooling pipe and a water circulation heat exchange device. The water-cooling pipe is arranged in the high-pressure chamber and in contact with the testing device. The water circulation heat exchange device is arranged outside the high-pressure chamber to control the temperature of the testing device.

6. A testing method based on the ultra-high temperature and high pressure rock sample testing system according to claim 5, characterized in that: The following steps are involved: S1. Clamping the rock sample in a heating chamber of a testing device; S2, starting the pressure device to apply a predetermined pressure to the rock sample through the pressure component; S3. Maintaining stable pressure, start the power supply device to provide external current for the heating component to operate, and at the same time start the cooling device to set the temperature of the water circulation heat exchange device to prevent the heating component from continuously heating up; S4, starting the transducer to perform a performance test on the rock sample and recording the physical data of the rock sample at different temperatures; S5. Fitting the rock sample's function with respect to temperature and pressure according to the experimental results.

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