High-temperature and high-pressure acoustic-electric combined measurement test device and use method thereof

Abstract

The invention discloses a high-temperature and high-pressure acoustic-electric combined measurement test device, the test device comprises an experiment cabin, a piston rod, an ultrasonic assembly and a resistor assembly, the experiment cabin comprises a pressure cavity surrounding shell and a base, a pressure cavity body is formed in the pressure cavity surrounding shell, and a piston opening is formed in the other end of the pressure cavity surrounding shell; one end of the piston rod penetrates through the piston opening and is positioned in the cavity body of the pressure cavity; the ultrasonic assembly comprises an ultrasonic transmitting probe and an ultrasonic receiving probe, the ultrasonic transmitting probe is located in one end of the piston rod, and the ultrasonic receiving probe is located in the base; the resistor assembly is located between the piston rod and the base. The invention further provides a use method of the high-temperature and high-pressure acoustic-electric combined measurement test device. Compared with the prior art, the high-temperature and high-pressure acoustic-electric combined measurement test device has the advantage that rock resistivity and ultrasonic wave velocity characteristics can be measured at the same time in a high-temperature and high-pressure environment.

Description

Technical Field

[0001] The present invention relates to the field of rock test devices, and particularly to a high-temperature and high-pressure acoustic-electricity combined measurement test device and a using method thereof. Background Art

[0002] Rock physical experiments are the bridge between reservoir geological parameters and geophysical parameters. Rock resistivity and ultrasonic velocity are important technical means in geotechnical engineering, oil exploration, and geological exploration. The combined measurement of these two physical parameters provides multi-dimensional information on rocks and formations, and is of great significance for understanding the physical properties, pore structures, rock-electric characteristics, etc. of rocks.

[0003] Currently, the measurements of rock resistivity and ultrasonic wave velocity characteristics need to be carried out in different experimental devices, and multiple cores need to be used for testing respectively. However, rocks have uncontrollable non-uniformity characteristics. To study the relationship between the two physical properties, tests need to be carried out under the same experimental conditions in the same experimental device. Currently, there are few experimental devices that can simultaneously measure rock resistivity and ultrasonic wave velocity characteristics under high-temperature and high-pressure conditions. In addition, as underground engineering continues to move deeper, the temperature and pressure environment of rocks is constantly increasing, and there is still no experimental device that can restore the high-temperature and high-pressure environment of deep rocks.

[0004] Therefore, how to provide a high-temperature and high-pressure acoustic-electricity combined measurement test device that can achieve the technical effect of simultaneously monitoring acoustic and electric characteristics under the condition of restoring the high-temperature and high-pressure environment of deep rocks is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] In view of the problems existing in the prior art, the technical problem to be solved by the present invention is to provide a high-temperature and high-pressure acoustic-electricity combined measurement test device that can achieve the technical effect of simultaneously monitoring acoustic and electric characteristics under the condition of restoring the high-temperature and high-pressure environment of deep rocks.

[0006] To achieve the above object, the present invention provides a high-temperature and high-pressure acoustic-electric combined measurement test device. The high-temperature and high-pressure acoustic-electric combined measurement test device includes: an experimental chamber, the experimental chamber includes a pressure chamber enclosure and a base, the pressure chamber enclosure is in a cylindrical structure, one end of the pressure chamber enclosure is detachably and hermetically connected to the base, a pressure chamber cavity is provided inside the pressure chamber enclosure, and a piston port is provided at the other end of the pressure chamber enclosure; a piston rod, one end of the piston rod passes through the piston port and is located inside the pressure chamber cavity, and the piston rod is movably and hermetically connected to the pressure chamber enclosure; an ultrasonic component, the ultrasonic component includes an ultrasonic transmitting probe and an ultrasonic receiving probe, the ultrasonic transmitting probe is located inside one end of the piston rod, and the ultrasonic receiving probe is located inside the base; the ultrasonic transmitting probe and the ultrasonic receiving probe are arranged opposite to each other; a resistance component, the resistance component is located between the piston rod and the base, the resistance component includes an upper electrode and a lower electrode, and a rock sample is placed between the upper electrode and the lower electrode, and the rock sample abuts against the lower end face of the upper electrode and the upper end face of the lower electrode respectively.

[0007] In the first aspect, the piston rod includes: a piston moving part, the piston moving part is in a cylindrical structure, the piston moving part is movably and hermetically connected to the pressure chamber enclosure, one end of the piston moving part is located outside the pressure chamber cavity, and the other end of the piston moving part is located inside the pressure chamber cavity; an ultrasonic wire routing channel is provided inside the piston moving part; a piston fixing part, the piston fixing part is in a cylindrical structure, one end of the piston fixing part is detachably connected to the other end of the piston moving part; a groove is provided at one end of the piston fixing part, the ultrasonic transmitting probe is located inside the groove, and the transmitting end face of the ultrasonic transmitting probe abuts against the bottom of the groove; a groove gasket is provided at the connection between the groove and the piston moving part, and a gasket wire outlet is provided at the center of the groove gasket; wherein, the transmitting wire of the ultrasonic transmitting probe sequentially passes through the gasket wire outlet and the ultrasonic wire routing channel and is connected to an ultrasonic transmitter.

[0008] In the first aspect, the resistance component further includes two alumina electrical insulation sheets, each alumina electrical insulation sheet is in a circular sheet structure, the upper and lower end faces of one alumina electrical insulation sheet respectively abut against the other end of the piston fixing part and the upper end face of the upper electrode; the upper and lower end faces of the other alumina electrical insulation sheet respectively abut against the lower end face of the lower electrode and the base.

[0009] In a first aspect, two electrode wire routing openings are provided in the base. One end of each electrode routing opening communicates with the pressure chamber cavity, and an aviation plug is provided at one end of each electrode routing opening. The upper electrode and the lower electrode are respectively connected to one end of the corresponding aviation plug through a first wire, and the other ends of the corresponding two aviation plugs are respectively connected to an impedance analyzer through a second wire.

[0010] In a first aspect, a receiving cavity is provided inside the base. The ultrasonic receiving probe is located in the receiving cavity, and the receiving end face of the ultrasonic receiving probe abuts against the base.

[0011] In a first aspect, the surfaces of the ultrasonic transmitting probe in contact with the piston fixing part and the ultrasonic receiving probe in contact with the base are both wrapped with high-temperature resistant acoustic-electric insulating materials.

[0012] The present invention also provides a usage method for a high-temperature and high-pressure acoustic-electric combined measurement test device, which is used for the above-mentioned high-temperature and high-pressure acoustic-electric combined measurement test device. The usage method includes: installing a rock specimen in the pressure chamber cavity, heating and pressurizing the inside of the pressure chamber cavity so that the temperature and pressure inside the pressure chamber cavity both reach the test parameters, and then testing the ultrasonic wave velocity and resistivity; then applying axial pressure and testing the ultrasonic wave velocity and resistivity.

[0013] In a second aspect, the usage method further includes: before installing the rock specimen in the pressure chamber cavity, performing high-temperature and high-pressure calibration on the ultrasonic time difference and the inherent resistance of the electrode.

[0014] In a second aspect, the high-temperature and high-pressure calibration of the ultrasonic time difference and the inherent resistance of the electrode specifically includes: not installing a rock specimen in the pressure chamber cavity, making the upper electrode and the lower electrode in direct contact, and then heating and pressurizing the inside of the pressure chamber cavity, testing the ultrasonic initial arrival time under different temperatures and different confining pressures and the electrode resistance at different frequencies, and using them as calibration data to reduce the subsequent test results.

[0015] In a second aspect, the applying of axial pressure and the testing of the ultrasonic wave velocity and resistivity specifically include: applying axial pressure until the rock specimen yields or fractures, and then testing the ultrasonic wave velocity and resistivity; or, applying axial pressure in stages and testing the ultrasonic wave velocity and resistivity under each stage of axial pressure condition.

[0016] Beneficial effects:

[0017] A high-temperature and high-pressure acoustic-electric combined measurement test device of the present invention mainly includes an experimental chamber, a piston rod, an ultrasonic component, and a resistance component. A heating jacket is arranged closely around the pressure chamber enclosure of the experimental chamber to heat the pressure chamber enclosure and heat and insulate the interior of the pressure chamber cavity. A heat preservation jacket is arranged on the periphery of the heating jacket for heat preservation; the pressure chamber cavity is used to place a rock sample, and a thermocouple is arranged in the pressure chamber cavity to monitor the temperature in the pressure chamber cavity; a heating circulation inlet and a pressure inlet are opened on the base, and a heating circulation outlet is opened at the top of the pressure chamber enclosure. The heating circulation inlet, the pressure inlet, and the heating circulation outlet are all communicated with the pressure chamber cavity. Heating liquid is introduced into the pressure chamber cavity through the heating circulation inlet and flows out through the heating circulation outlet to circulate the heating liquid in the pressure chamber cavity to achieve the setting of the temperature in the pressure chamber cavity. Combined with the heating jacket and the heat preservation jacket, the heating temperature is made more accurate; when the temperature in the pressure chamber cavity reaches the experimental target temperature, pressurized liquid is introduced through the pressure inlet to apply confining pressure to the rock sample so that the rock sample is in a high-temperature and high-confining pressure environment; the piston rod is used to apply axial pressure to the rock sample; the ultrasonic emission probe is used to emit ultrasonic waves through the rock sample and received by the ultrasonic receiving probe, and the change in wave velocity is measured to obtain the change in the elastic properties of the rock sample during the experiment; the upper electrode and the lower electrode are used to measure the change in the resistivity of the rock sample during the experiment; in summary, a high-temperature and high-pressure acoustic-electric combined measurement test device of the present invention realizes the simultaneous measurement of the resistivity and ultrasonic wave velocity characteristics of rocks in a high-temperature and high-pressure environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic connection structure diagram of the experimental chamber, piston rod, ultrasonic component, and resistance component of the present invention.

[0020] Reference numerals:

[0021] 11. Pressure chamber enclosure; 12. Base; 13. Pressure chamber cavity;

[0022] 2. Piston rod; 21. Piston moving part; 22. Ultrasonic wire routing channel; 23. Piston fixing part; 24. Groove gasket;

[0023] 31. Ultrasonic emission probe; 32. Ultrasonic receiving probe;

[0024] 4. Resistance component; 41. Upper electrode; 42. Lower electrode; 43. Alumina electrical insulating sheet;

[0025] 5. Rock specimen. Detailed implementation mode

[0026] Next, the technical solutions in the embodiments of this specification will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of this specification, rather than all the embodiments. Based on the embodiments in this specification, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0027] Embodiment 1

[0028] As Figure 1 shown, Embodiment 1 of the present invention provides a high-temperature and high-pressure acoustic-electric combined measurement test device. The high-temperature and high-pressure acoustic-electric combined measurement test device includes: an experimental chamber, the experimental chamber includes a pressure chamber enclosure 11 and a base 12, the pressure chamber enclosure 11 has a cylindrical structure, one end of the pressure chamber enclosure 11 is detachably and hermetically connected to the base 12, a pressure chamber cavity 13 is provided inside the pressure chamber enclosure 11, and a piston port is provided at the other end of the pressure chamber enclosure 11; a piston rod 2, one end of the piston rod 2 passes through the piston port and is located inside the pressure chamber cavity 13, and the piston rod 2 is movably and hermetically connected to the pressure chamber enclosure 11; an ultrasonic component, the ultrasonic component includes an ultrasonic transmitting probe 31 and an ultrasonic receiving probe 32, the ultrasonic transmitting probe 31 is located inside one end of the piston rod 2, and the ultrasonic receiving probe 32 is located inside the base 12; the ultrasonic transmitting probe 31 and the ultrasonic receiving probe 32 are arranged opposite to each other; a resistance component 4, the resistance component 4 is located between the piston rod 2 and the base 12, the resistance component 4 includes an upper electrode 41 and a lower electrode 42, a rock specimen 5 is placed between the upper electrode 41 and the lower electrode 42, and the rock specimen 5 abuts against the lower end face of the upper electrode 41 and the upper end face of the lower electrode 42 respectively.

[0029] A high-temperature and high-pressure acoustic-electric combined measurement test device of the present invention mainly includes an experimental chamber, a piston rod, an ultrasonic component, and a resistance component. A heating jacket is arranged closely around the pressure chamber housing of the experimental chamber to heat the pressure chamber housing, so as to heat and keep warm the interior of the pressure chamber cavity. A heat preservation jacket is arranged outside the heating jacket for heat preservation; the pressure chamber cavity is used to place a rock sample, and a thermocouple is arranged inside the pressure chamber cavity to monitor the temperature inside the pressure chamber cavity; a heating circulation inlet and a pressurization inlet are opened on the base, and a heating circulation outlet is opened at the top of the pressure chamber housing. The heating circulation inlet, the pressurization inlet, and the heating circulation outlet are all communicated with the pressure chamber cavity. Heating liquid is introduced into the pressure chamber cavity through the heating circulation inlet and flows out through the heating circulation outlet for the heating liquid to circulate in the pressure chamber cavity, so as to achieve the setting of the temperature in the pressure chamber cavity, and combined with the heating jacket and the heat preservation jacket, the heating temperature is made more accurate; when the temperature inside the pressure chamber cavity reaches the experimental target temperature, pressurized liquid is introduced through the pressurization inlet to apply confining pressure to the rock sample, so that the rock sample is in a high-temperature and high-confining-pressure environment; the piston rod is used to apply axial pressure to the rock sample, so that the rock sample is in a high-temperature and high-pressure environment; the ultrasonic emission probe is used to emit ultrasonic waves through the rock sample and be received by the ultrasonic receiving probe, and the change of the wave velocity is measured to obtain the change of the elastic characteristics of the rock sample during the experiment; the upper electrode and the lower electrode are used to measure the change of the resistivity of the rock sample during the experiment; in summary, a high-temperature and high-pressure acoustic-electric combined measurement test device of the present invention realizes the simultaneous measurement of the resistivity and ultrasonic wave velocity characteristics of the rock under high-temperature and high-pressure environments.

[0030] In some possible implementation manners, the piston rod 2 includes: a piston moving part 21, the piston moving part 21 has a cylindrical structure, the piston moving part 21 is movably and sealingly connected with the pressure chamber housing 11, one end of the piston moving part 21 is located outside the pressure chamber cavity 13, and the other end of the piston moving part 21 is located inside the pressure chamber cavity 13; an ultrasonic wire routing channel 22 is opened inside the piston moving part 21; a piston fixing part 23, the piston fixing part 23 has a cylindrical structure, one end of the piston fixing part 23 is detachably connected with the other end of the piston moving part 21; a groove is opened at one end of the piston fixing part 23, the ultrasonic emission probe 31 is located in the groove, and the emission end face of the ultrasonic emission probe 32 abuts against the bottom of the groove; a groove gasket 24 is arranged at the connection between the groove and the piston moving part 21, and a gasket wire outlet is opened at the center of the groove gasket 24; wherein, the emission wire of the ultrasonic emission probe 31 sequentially passes through the gasket wire outlet and the ultrasonic wire routing channel 22 and is connected with the ultrasonic emitter.

[0031] Specifically, the piston rod applies axial loading force to the rock sample through hydraulic pressure; the ultrasonic wiring channel and the sealing gasket outlet are used for the wire outlet of the ultrasonic transmitting probe, and the groove sealing gasket is used to isolate the groove, the ultrasonic wiring channel and the liquid in the pressure chamber to avoid affecting the ultrasonic transmitting probe; the contact surface of the ultrasonic transmitting probe and the groove is wrapped with high-temperature resistant acoustic-electrical insulating material to avoid the conduction between the probe and the cavity, which will cause large acoustic wave signal noise and affect the results.

[0032] In some possible implementations, the resistor assembly 4 also includes two aluminum oxide electrical insulating sheets 43, each of which is a disc-shaped structure, and the upper and lower end surfaces of one aluminum oxide electrical insulating sheet 43 are respectively abutted against the other end of the piston fixing portion 23 and the upper end surface of the upper electrode 41; the upper and lower end surfaces of the other aluminum oxide electrical insulating sheet 43 are respectively abutted against the lower end surface of the lower electrode 42 and the base 12.

[0033] Specifically, in order to avoid conductive interference caused by conduction between the upper and lower electrodes and the piston rod and the base, an alumina electrical insulating sheet is provided for insulation; suede can be provided at the contact interfaces between the upper electrode and the lower electrode and the rock sample to enhance the interface conductivity, thereby completing the resistivity measurement of the rock sample.

[0034] In some possible implementations, two electrode wire routing ports are provided in the base 12, one end of each of the electrode routing ports is connected to the pressure chamber body 13, and one end of each of the electrode routing ports is provided with an aviation plug; the upper electrode 41 and the lower electrode 42 are respectively connected to one end of the corresponding aviation plug through a first wire, and the other ends of the corresponding two aviation plugs are respectively connected to an impedance analyzer through a second wire.

[0035] Specifically, the aviation plug can realize the closed loop of the electrode test circuit by plugging and unplugging the external wire of the pressure chamber; the impedance analyzer is used to measure the resistivity.

[0036] In some possible implementations, a accommodating cavity is opened inside the base 12, and the ultrasonic receiving probe 32 is located in the accommodating cavity, and the receiving end face of the ultrasonic receiving probe 32 is against the base 12; the surface of the ultrasonic transmitting probe 31 in contact with the piston fixing part 23 and the surface of the ultrasonic receiving probe 32 in contact with the base 12 are both wrapped with high-temperature resistant sound-electrical insulating material.

[0037] Specifically, the accommodating cavity is isolated from the pressure cavity, and the surface where the ultrasonic transmitting probe contacts the groove, as well as the surface where the ultrasonic receiving probe contacts the base, are wrapped with high-temperature resistant acoustic-electrical insulating material to prevent the probe and the cavity from conducting electricity, resulting in large acoustic wave signal noise and affecting the test results.

[0038] Embodiment 2

[0039] As Figure 1 shown, Embodiment 2 of the present invention provides a method for using a high-temperature and high-pressure acoustic-electric combined measurement test device for use in the high-temperature and high-pressure acoustic-electric combined measurement test device described in Embodiment 1. The method for use includes: installing a rock sample in the pressure chamber cavity, heating and pressurizing the inside of the pressure chamber cavity so that the temperature and pressure inside the pressure chamber cavity both reach the test parameters, and then testing the ultrasonic wave velocity and resistivity; then applying axial pressure and testing the ultrasonic wave velocity and resistivity; the method for use further includes: before installing the rock sample in the pressure chamber cavity, performing high-temperature and high-pressure calibration on the ultrasonic wave travel time and the inherent resistance of the electrode; the specific steps for performing high-temperature and high-pressure calibration on the ultrasonic wave travel time and the inherent resistance of the electrode include: not installing a rock sample in the pressure chamber cavity, making the upper electrode and the lower electrode in direct contact, and then heating and pressurizing the inside of the pressure chamber cavity, testing the initial arrival time of ultrasonic waves under different temperatures and different confining pressures and the electrode resistance at different frequencies, and using the test results as calibration data to reduce the subsequent test results; the specific steps for applying axial pressure and testing the ultrasonic wave velocity and resistivity include: applying axial pressure until the rock sample yields or fractures, and then testing the ultrasonic wave velocity and resistivity; or, applying axial pressure in stages and testing the ultrasonic wave velocity and resistivity under each stage of axial pressure condition.

[0040] Specifically, before testing the rock specimen, the ultrasonic time difference of the high-temperature and high-pressure acoustic-electric combined measurement test device of the present invention and the inherent resistance of the electrode are calibrated at high temperature and high pressure without placing the rock specimen, that is, the temperature in the pressure chamber is heated to the experimental target temperature, and the experimental target confining pressure is applied to make the confining pressure and temperature in the pressure chamber reach the experimental target parameters. In this target parameter environment, the ultrasonic initial arrival time and the electrode resistance at different frequencies are respectively measured through the ultrasonic component and the resistance component, so as to perform reduction according to this calibration data during the test; during the experiment, the temperature in the pressure chamber is heated to the experimental target temperature, and the experimental target confining pressure is applied to make the pressure chamber reach the experimental target high-temperature and high-confining pressure environment, and then the axial pressure is applied in stages through the piston rod to make the rock specimen under high temperature and high pressure conditions, and the ultrasonic wave number measurement and resistivity measurement are carried out. The application method of the axial pressure can be divided into two types. One is to directly apply the axial pressure to the rock specimen until the rock specimen yields or fractures, and then measure the ultrasonic wave velocity and resistivity. The other is to apply the axial pressure to the rock specimen in stages, and perform the ultrasonic wave number measurement and resistivity measurement at each stage of axial pressure until it is applied until the rock specimen yields or fractures, so as to achieve the ultrasonic wave number measurement and resistivity measurement during the experimental process of the rock specimen. It should be noted that the usage method of a high-temperature and high-pressure acoustic-electric combined measurement test device in the second embodiment is for the usage of the high-temperature and high-pressure acoustic-electric combined measurement test device in the first embodiment. Therefore, the performance principle of the high-temperature and high-pressure acoustic-electric combined measurement test device is not described in detail here, and the parts not described in detail can be referred to the first embodiment.

[0041] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention based on the concept of the present invention through logical analysis, reasoning, or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A high-temperature and high-pressure acoustic-electric combined measurement test device, characterized in that, The high-temperature and high-pressure acoustic-electric combined measurement test device includes: An experimental chamber, the experimental chamber includes a pressure chamber enclosure (11) and a base (12), the pressure chamber enclosure (11) has a cylindrical structure, one end of the pressure chamber enclosure (11) is detachably and sealingly connected to the base (12), a pressure chamber cavity (13) is provided inside the pressure chamber enclosure (11), and a piston port is provided at the other end of the pressure chamber enclosure (11); A piston rod (2), one end of the piston rod (2) passes through the piston port and is located inside the pressure chamber cavity (13), and the piston rod (2) is movably and sealingly connected to the pressure chamber enclosure (11); An ultrasonic component, the ultrasonic component includes an ultrasonic transmitting probe (31) and an ultrasonic receiving probe (32), the ultrasonic transmitting probe (31) is located inside one end of the piston rod (2), and the ultrasonic receiving probe (32) is located inside the base (12); the ultrasonic transmitting probe (31) and the ultrasonic receiving probe (32) are arranged oppositely; A resistance component (4), the resistance component (4) is located between the piston rod (2) and the base (12), the resistance component (4) includes an upper electrode (41) and a lower electrode (42), a rock sample (5) is placed between the upper electrode (41) and the lower electrode (42), and the rock sample (5) abuts against the lower end face of the upper electrode (41) and the upper end face of the lower electrode (42) respectively.

2. The high-temperature and high-pressure acoustic-electric combined measurement test device according to claim 1, characterized in that The piston rod (2) includes: A piston moving part (21), the piston moving part (21) has a cylindrical structure, the piston moving part (21) is movably and sealingly connected to the pressure chamber enclosure (11), one end of the piston moving part (21) is located outside the pressure chamber cavity (13), and the other end of the piston moving part (21) is located inside the pressure chamber cavity (13); an ultrasonic wire routing channel (22) is provided inside the piston moving part (21); A piston fixing part (23), the piston fixing part (23) has a cylindrical structure, one end of the piston fixing part (23) is detachably connected to the other end of the piston moving part (21); a groove is provided at one end of the piston fixing part (23), the ultrasonic transmitting probe (31) is located inside the groove, and the transmitting end face of the ultrasonic transmitting probe (32) abuts against the bottom of the groove; a groove gasket (24) is provided at the connection between the groove and the piston moving part (21), and a gasket wire outlet is provided at the center of the groove gasket (24); Wherein, the transmitting wire of the ultrasonic transmitting probe (31) sequentially passes through the gasket wire outlet and the ultrasonic wire routing channel (22) and is connected to an ultrasonic transmitter.

3. The high-temperature and high-pressure acoustic-electric combined measurement test device according to claim 2, characterized in that: The resistance component (4) further includes two alumina electrical insulating sheets (43). Each alumina electrical insulating sheet (43) has a disc-like structure. The upper and lower end faces of one alumina electrical insulating sheet (43) respectively abut against the other end of the piston fixing part (23) and the upper end face of the upper electrode (41); the upper and lower end faces of the other alumina electrical insulating sheet (43) respectively abut against the lower end face of the lower electrode (42) and the base (12).

4. The high-temperature and high-pressure acoustic-electric combined measurement test device according to claim 3, wherein: Two electrode wire routing openings are formed in the base (12). One end of each electrode routing opening communicates with the pressure chamber cavity (13). An aviation plug is arranged at one end of each electrode routing opening; the upper electrode (41) and the lower electrode (42) are respectively connected to one end of the corresponding aviation plug through a first wire, and the other ends of the corresponding two aviation plugs are respectively connected to an impedance analyzer through a second wire.

5. The high-temperature and high-pressure acoustic-electric combined measurement test device according to claim 4, wherein: An accommodation cavity is formed inside the base (12). The ultrasonic receiving probe (32) is located in the accommodation cavity, and the receiving end face of the ultrasonic receiving probe (32) abuts against the base (12).

6. The high-temperature and high-pressure acoustic-electric combined measurement test device according to claim 5, wherein: The surfaces of the ultrasonic transmitting probe (31) in contact with the piston fixing part (23) and the ultrasonic receiving probe (32) in contact with the base (12) are both wrapped with high-temperature-resistant acoustic-electric insulating materials.

7. A method for using a high-temperature and high-pressure acoustic-electric combined measurement test device, which is used for the use of a high-temperature and high-pressure acoustic-electric combined measurement test device according to any one of claims 1 to 6, characterized in that, The usage method includes: Installing the rock sample in the pressure chamber cavity, heating and pressurizing the inside of the pressure chamber cavity so that the temperature and pressure inside the pressure chamber cavity both reach the test parameters, and then measuring the ultrasonic wave velocity and resistivity; Then applying axial pressure and measuring the ultrasonic wave velocity and resistivity.

8. The usage method of a high-temperature and high-pressure acoustic-electric combined measurement test device according to claim 7, characterized in that, The usage method further includes: Before installing the rock sample in the pressure chamber cavity, calibrating the ultrasonic time difference and the inherent resistance of the electrodes under high temperature and high pressure.

9. The method for using a high-temperature and high-pressure acoustic-electric combined measurement test device according to claim 8, characterized in that, The calibration of the ultrasonic time difference and the inherent resistance of the electrodes under high temperature and high pressure specifically includes: Without installing the rock sample in the pressure chamber cavity, making the upper electrode and the lower electrode in direct contact, and then heating and pressurizing the inside of the pressure chamber cavity, measuring the initial arrival time of ultrasonic waves under different temperatures and different confining pressures and the electrode resistance at different frequencies, and using these as calibration data to reduce the subsequent test results.

10. The method of using a high-temperature and high-pressure acoustic-electric combined measurement test device according to claim 7, characterized in that, The step of applying axial pressure and measuring the ultrasonic wave velocity and resistivity specifically includes: Applying axial pressure until the rock sample yields or fractures, and then measuring the ultrasonic wave velocity and resistivity; Or, Applying axial pressure in stages and measuring the ultrasonic wave velocity and resistivity under each stage of axial pressure condition.

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