CN108169448B - A kind of hydrate in situ synthesis and its comprehensive physical property testing device - Google Patents

Abstract

The invention discloses a hydrate in-situ synthesis and a comprehensive physical property testing device, comprising a reactor arranged in the center of a sealed shell and with a sample to be tested inside, a thermal conductivity characteristic testing system for measuring the thermal conductivity of the sample, and a reactor for measuring the thermal conductivity of the sample. The resistivity test system for measuring the resistivity of the sample, the ultrasonic test system for measuring the sound wave velocity of the sample, and the constant temperature bath system communicated with the sealing shell through the pipeline. The device can measure the acoustic properties, resistivity and thermophysical properties of natural gas hydrates or hydrates in sediments in situ under high pressure and low temperature, which expands the application range of the existing devices and improves the measurement accuracy.

Description

A kind of hydrate in situ synthesis and its comprehensive physical property testing device

technical field

The invention relates to a device for in-situ synthesis of natural gas hydrates or hydrates in sediments and comprehensive testing thereof, in particular to a device for in-situ measurement of the sound velocity, sonic velocity, and hydrate of natural gas hydrates or hydrates in sediments under high pressure and low temperature environments. A comprehensive physical property testing device for resistivity and thermal conductivity.

Background technique

Natural gas hydrate is an ice-like solid formed by gas (or volatile liquid) and water under certain temperature and pressure conditions, commonly known as combustible ice, widely distributed in the sediments below the surface of the permafrost and the seafloor of the continental margin. middle. Natural gas hydrate has huge natural gas storage capacity. The world's natural gas hydrate reserves are very huge, equivalent to 2×10 ⁵⁰⁰ million tons of oil equivalent, which is twice the total carbon content of conventional fuels in the world.

One of the key issues associated with research on gas hydrate extraction, climate, and geology is how to estimate gas hydrate resource reserves. The volumetric method is used to calculate the natural gas hydrate resources, and the relevant reservoir parameters include: the distribution area of the hydrate-bearing reservoir, the thickness of the reservoir, the porosity and the hydrate saturation. First of all, the propagation velocity of sound waves in rocks is an information carrier that can better reflect the comprehensive physical properties of rocks. From the analysis of geophysical data, it can be seen that the velocity of sound waves is closely related to stratigraphic lithology, internal rock structure, burial depth and geological age. close relationship. The research on the acoustic response characteristics of gas hydrates and reservoirs and the development of acoustic exploration methods for natural gas hydrates are of great significance to the exploration, resource evaluation and development of natural gas hydrates. Secondly, thermophysical properties are also one of the most important physical properties of hydrate-bearing reservoirs, and are an important basis for hydrate extraction potential assessment and economic calculation. Among them, thermal conductivity, thermal diffusivity (thermal conductivity) and specific heat are the three most critical parameters. Again, resistivity is also a very important physical property of hydrate-bearing reservoirs. The resistivity method estimates hydrate saturation based on the abnormal degree of high resistivity of gas hydrate-bearing sediments. Compared with water-saturated sediments under the same conditions, the occurrence of hydrates leads to an increase in the resistivity of sedimentary reservoirs.

At present, there are some comprehensive physical property testing systems on the market that integrate various physical property measurement methods such as magnetism, electricity, heat, morphology, and even ferroelectricity and dielectricity. However, these products are all negative pressure designs, which cannot perform high pressure tests, nor do they support in-situ synthesis of samples. The design of this application makes full use of the low temperature and high pressure environment of the entire system, which greatly reduces the need for customers to purchase instruments. And the cost of designing a sample synthesis device, avoiding the tediousness and errors of setting up experiments by yourself, and can quickly realize the precious research ideas of researchers.

Invention patent content

The object of the present invention is to provide a device for in-situ synthesis of natural gas hydrate or hydrate in sediment and comprehensive testing thereof, especially a device for in-situ measurement of natural gas hydrate or hydrate in sediment under high pressure and low temperature environment The comprehensive physical property testing device for acoustic properties, resistivity and thermal properties expands the application range of the existing devices and improves the measurement accuracy.

To achieve the above purpose, the present invention proposes the following technical solutions:

A device for in-situ synthesis of hydrate and its comprehensive physical property testing device, comprising a guide rail bracket arranged on a load-bearing bottom plate, a sealing shell is arranged on the guide rail bracket, and a device to be tested is arranged in the sealed shell and is built-in. The reactor of the sample, the thermal conductivity test system for measuring the thermal conductivity of the sample, the resistivity test system for measuring the resistivity of the sample, the ultrasonic test system for measuring the sound wave velocity of the sample, and the constant temperature connected to the sealed shell through the pipeline. A temperature bath system, the thermal conductivity testing system and the resistivity testing system can be relatively movable at the upper and lower positions of one end of the reactor, and can be in contact with the reactor, and the ultrasonic testing system is horizontally arranged on the reactor Both ends of , are also connected to the reactor.

The ultrasonic testing system includes an ultrasonic injection system and an ultrasonic derivation system that are oppositely arranged at both ends of the reactor and have the same structure. The ultrasonic injection system is fixedly connected to one end of the reactor, and the ultrasonic derivation device can be horizontally displaced, thereby Can be in contact with the other end of the reactor; the ultrasonic injection system includes a piston rod connected with the reactor at one end, and the other end of the piston rod is connected to a piston rod push-pull system through the side of the sealed shell , an ultrasonic transducer spring and an ultrasonic transducer are arranged inside the piston rod, and the ultrasonic transducer spring is located at the end of the ultrasonic transducer away from the test sample, which can make the ultrasonic transducer close to the The inner wall of the piston rod cavity.

The piston rod push-pull system includes a threaded pressure rod, the threaded pressure rod and the piston rod are connected by a coupling, a runner is fixedly arranged at the outer end of the threaded pressure rod, and the runner is supported by a runner wheel. One end of the runner support structure is connected to the threaded pressure rod, and the other end is fixed to the outer wall of the sealing shell.

A positioning rod is set on the piston rod, and a displacement sensor L is set on the outer wall of the sealing shell. The positioning rod and the displacement sensor L are connected by a measuring rod, and the position information of the positioning rod can be obtained from the displacement. The sensor L is obtained, and the length of the sample can be calculated through the signals of the displacement sensor L of the ultrasonic injection system and the ultrasonic derivation system.

The thermal conduction characteristic testing system includes a thermal conduction test probe, a thermal conduction sensor is provided on the side of the thermal conduction test probe facing the reactor, the thermal conduction probe is threadedly connected to a thermal conduction test probe push-pull system, and the thermal conduction test probe push-pull system has a structure. The structure is the same as that of the piston rod push-pull system. The thermal conductivity test probe can be pushed to the coaxial position of the sample or pulled away from the sample. The data acquisition device of the thermal conductivity characteristic testing system is connected.

The resistivity test system includes a four-pointer resistance probe, a four-pointer resistance probe lead and a resistivity test probe push-pull system, the resistivity test probe push-pull system is similar to a piston rod push-pull system, a four-point resistance probe and a resistivity test system The data analysis and acquisition system is connected by the lead wire of the four-point probe resistance probe, and the four-point probe resistance probe and the resistivity test probe push-pull system are connected by threads, and the four-point probe resistance probe can be pushed to the coaxial position of the sample or pulled away from the sample.

The constant temperature bath system includes a constant temperature bath and corresponding connecting pipes, the sealed shell is provided with corresponding water inlet and outlet ports, and the constant temperature bath is connected to the water inlet and outlet ports through the connecting pipes to form a water flow loop to maintain all the water inlet and outlet ports. The temperature of the reactor was constant.

The sealed shell includes a heat preservation outer shell, a water jacket, and a stainless steel inner shell in sequence from the outside to the inside, and the sealed shell includes two left and right parts, which are connected by bolts and sealed by a ring seal.

The bottom of the inner wall of the sealed shell is provided with a reactor bottom piston, the reactor is supported on the reactor bottom piston by a reactor bracket, and a reactor bottom piston push-pull system is arranged below the reactor bottom piston, so The structure of the piston push-pull system at the bottom of the reactor is the same as that of the piston rod push-pull system.

The side wall of the reactor is provided with a reactor rotator, the reactor support is connected with the rotating shaft of the side wall of the reactor, and the reactor can be rotated by rotating the reactor rotator.

The steps to use this device are as follows:

(1) Sample loading

Before the test, remove the bolts of the device shell, then use the guide rail bracket to push the left part of the device away, then use the reactor rotator to place the reactor vertically, and use the reactor bottom piston push-pull system to push the reactor bottom piston to seal the bottom of the reactor . A sediment sample with a certain moisture content is placed, and the casing of the device is sealed.

(2) Sample synthesis

In order to eliminate the interference of residual air in the device, connect the vacuuming system to the gas inlet and outlet, open the vacuuming system and valve to start vacuuming the device, after about 15 minutes, the vacuuming is completed, close the valve, and connect the intake system to intake air. After the pressure was equilibrated, the constant temperature bath, data acquisition instrument and computer were turned on to monitor the progress of the reaction.

(3) Acoustic characteristic test of hydrate

After the reaction is completed, the bottom piston of the reactor is separated from the reactor by slowly pulling the piston at the bottom of the reactor by using the piston push-pull system at the bottom of the reactor. After separation, it can be rotated 90 degrees by the reactor rotator. When the reactor is placed horizontally, by moving the piston rod, the sediment sample can be kept in a cylindrical shape and the acoustic wave transmission characteristics can be tested. When the acoustic wave transmission characteristics are tested, the piston rod is moved away from the sample using the piston rod push-pull system.

(4) Hydrate thermophysical property test

Use the thermal conductivity test probe push-pull system to push the thermal conductivity test probe to the coaxial position of the sample, and use the piston rod push-pull system to move the piston rod, so that the thermal conductivity test probe, the sample and the piston rod are coaxial and closely attached, and then the thermal conductivity of the sample is tested. When the thermal conductivity characteristic is tested, use the piston rod push-pull system to move the piston rod to make the sample leave the thermal conductivity test probe, and then use the thermal conductivity test probe push-pull system to pull out the thermal conductivity test probe.

(5) Hydrate resistivity test

Use the resistivity test probe push-pull system to push the four-point probe resistance probe to the coaxial position of the sample, and then use the piston rod push-pull system to move the piston rod to make the four-point probe resistance probe, the sample and the piston rod coaxial and close to each other, and then the sample resistance characteristic test. After the resistance characteristic test is completed, use the piston rod push-pull system to move the plug rod to make the sample leave the four-point probe resistance probe, and then use the resistivity test probe push-pull system to pull out the four-point probe resistance probe.

(6) Change the temperature and pressure conditions

Change the temperature or pressure for the next round of testing.

The beneficial effects of the present invention are:

The comprehensive physical properties of acoustic properties, resistivity and thermal properties of natural gas hydrates or hydrates in sediments can be measured in situ under high pressure and low temperature, which expands the application range of the existing devices and improves the measurement accuracy.

Description of drawings

FIG. 1 is a schematic structural diagram of the in-situ synthesis of hydrate and its comprehensive physical property testing device according to the present invention.

Figure 2 is a schematic diagram of the initial state of the reactor.

FIG. 3 is a schematic diagram of the state after the reactor is rotated by 90°.

Reference number:

1- Load-bearing bottom plate, 2- Guide rail bracket, 3- Thermal insulation shell, 4- Water jacket, 5- Stainless steel inner shell, 6- First piston rod, 7- Coupling, 8- Threaded pressure rod, 9- Runner , 10-first ultrasonic signal line, 11-runner support, 12-positioning rod, 13-first water jacket outlet, 14-bolt, 15-second water jacket outlet, 16-conductive probe lead, 17- thermal conductivity test probe push-pull system, 18- gas inlet and outlet, 19- second piston rod push-pull system, 20- second ultrasonic signal line, 21- constant temperature bath, 22- constant temperature bath water outlet, 23- second water jacket Water inlet, 24- Constant temperature bath water inlet, 25- Device support rod, 26- Four-probe resistance probe lead, 27- Resistivity test probe push-pull system, 28- Reactor bottom piston push-pull system, 29- First water jacket Water inlet, 30-reactor bottom piston, 31-reactor bracket, 32-first ultrasonic transducer spring, 33-first ultrasonic transducer, 34-"O" ring, 35-reactor, 36- Sample, 37- Thermal Conductivity Sensor, 38- Thermal Conductivity Test Probe, 39- Second Piston Rod, 40- Second Ultrasonic Transducer, 41- Four-Probe Resistance Probe, 42- Reactor Rotator, 43- Window, L- Displacement sensor, T-temperature sensor, P-pressure sensor.

Detailed ways

The content of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Example:

Gas hydrate is an envelope-like crystal formed by the interaction of gas or volatile liquid with water. Gas hydrate needs to exist under high pressure and low temperature, so its physical properties need to be measured in situ.

As shown in Figure 1, a device for in-situ synthesis of natural gas hydrate or hydrate in sediments and its comprehensive testing includes a load-bearing base 1, a guide rail bracket 2, a reactor 35 with a sample to be tested 36 built in, a thermal conductivity measuring device Thermal conductivity test system, resistivity test system for measuring resistivity, ultrasonic test system for measuring sound wave velocity, constant temperature bath system 21, device casing, etc.

The outer casing of the device is composed of a thermal insulation outer casing 3 , a water jacket 4 , and a stainless steel inner casing 5 . The entire housing is divided into left and right parts, which are connected by a plurality of bolts 14 and sealed by a plurality of "O" rings 34 . The first piston rod 6, the second piston rod 39, the thermal conductivity test probe 38, the four-probe resistance probe 41, the piston 30 at the bottom of the reactor and the inner wall of the opening of the device shell are also sealed with an anti-wear "O" ring to prevent the reaction process. The involved gas leaks into the air.

The reactor 35 is supported by the reactor bottom piston 30 and the reactor support 31 and fixed on the stainless steel inner shell 5 .

In the ultrasonic testing system, the first piston rod 6, the coupling 7, the threaded pressure rod 8, the runner 9, the first ultrasonic signal line 10, the runner support 11, the positioning rod 12, the first ultrasonic transducer spring 32. The first ultrasonic transducer 33, the second piston rod push-pull system 19, the second ultrasonic signal line 20, the second piston rod 39, the second ultrasonic transducer 40 and the displacement sensor L are composed. The first piston rod 6, the coupling 7, the threaded pressure rod 8, the runner 9, the first ultrasonic signal line 10, the runner support 11, and the positioning rod 12 are respectively connected to form the first piston rod push-pull system. The second piston rod push-pull system 19 is similar to the first piston rod push-pull system. The first piston rod 6 is equipped with a first ultrasonic transducer spring 32 and a first ultrasonic transducer 33, and the first ultrasonic transducer spring 32 is located on the left side of the first ultrasonic transducer 33, which allows the first ultrasonic transducer to be replaced. The energy device 33 is in close contact with the inner wall of the inner cavity of the first piston rod 6 . The first piston rod 6, the coupling 7, the threaded pressure rod 8, the runner 9, the first ultrasonic transducer 33, the second piston rod push-pull system 19, the second piston rod 39, the second ultrasonic transducer 40 The axes are symmetrical, the first piston rod 6 and the second piston rod 39 are provided with openings, and the lead wires of the first ultrasonic signal line 10 and the second ultrasonic signal line 20 are drawn out from the openings. The end of the displacement sensor L is fixed on the thermal insulation casing 3, and the measuring rod is in contact with the positioning rod 12. The position information of the positioning rod 12 can be obtained by the displacement sensor L, and the length of the sample 36 can be calculated by the displacement sensor signals at both ends.

The thermal conductivity characteristic testing system includes a thermal conductivity sensor 37 , a thermal conductivity test probe 38 , a thermal conductivity probe lead 16 and a thermal conductivity test probe push-pull system 17 . The thermally conductive test probe push-pull system 17 is similar to the first piston rod push-pull system. The thermal conductivity test method adopts the transient plane heat source method. The thermal conductivity sensor 37 can be made of nickel metal with a thickness of 10 microns. The thermal conductivity sensor 37 of this spiral structure is protected by the outer thin film material of the thermal conductivity test probe 38 , which on the one hand provides the probe with a certain mechanical strength and on the other hand ensures the electrical insulation of the probe during use. The thermal conductivity sensor 37 and the data analysis and acquisition system of the thermal conductivity testing system are connected through the thermal conductivity probe lead 16 . The thermal conductivity test probe push-pull system 17 and the thermal conductivity test probe 38 are connected by screws, and the thermal conductivity test probe 38 can be pushed to the coaxial position of the sample 36 or pulled away from the sample 36 .

The resistivity test system includes a four-point probe resistance probe 41 , a four-point probe resistance probe lead 26 and a resistivity test probe push-pull system 27 . The resistivity test probe push-pull system 27 is similar to the first piston rod push-pull system. The four-point probe resistance probe 41 and the data analysis and acquisition system of the resistivity test system are connected through the four-point probe resistance probe lead 26 . The four-point probe resistance probe 41 and the resistivity test probe push-pull system 27 are connected by screws, and the four-point probe resistance probe 41 can be pushed to the coaxial position of the sample 36 or pulled away from the sample 36 .

The constant temperature bath system 21 includes a constant temperature bath and corresponding connecting pipes. The liquid in the constant temperature bath passes through the constant temperature bath, the connecting pipe and the water jacket 4 respectively, and then flows back to the constant temperature bath through the connecting pipe to complete the cycle, maintaining the temperature of the reaction kettle constant. Normally, the constant temperature bath water outlet 22 is connected to the first water jacket water inlet 29 and the second water jacket water inlet 23 at the same time; the constant temperature bath water inlet 24 is simultaneously connected to the first water jacket water outlet 13 and the second water jacket. Water outlet 15. A series connection method can also be used, that is, the constant temperature bath water outlet 22 is connected to the second water jacket water inlet 23, the second water jacket water outlet 15 is connected to the first water jacket water inlet 29, and the first water jacket water outlet 13 is connected. Constant temperature bath water inlet 24 .

In this embodiment, the temperature, pressure and sample length transmit signals to the data acquisition system through the temperature sensor T, pressure sensor P and displacement sensor L respectively, and the data is read and processed by the data acquisition system, and then transmitted to the computer for display and storage. .

As shown in FIG. 2 and FIG. 3 , the associated reactor 35 can be separated from the piston 30 at the bottom of the reactor, and can be rotated by 90 degrees through the reactor rotator 42 after separation. After the reactor 35 is leveled, the sample 37 inside the reactor 35 can move slightly to the left or right under the push of the first piston rod 6 and the second piston rod 39 . The position of the reactor 35 can be viewed through the viewing window 43 . When the reactor 35 is placed horizontally, by moving the first piston rod 6 and the second piston rod 39, the sediment sample can be maintained in a cylindrical shape.

In this embodiment, the data acquisition system adopts an Agilent-34970A data acquisition instrument from Agilent. The ultrasonic velocity analysis system uses an oscilloscope and an ultrasonic signal generator. The first ultrasonic transducer 33 and the second ultrasonic transducer 40 used for testing use PZT composite material transducers. The ultrasonic signal generator generates a pulse signal, and the signal is transmitted to the transducer 33 through the first ultrasonic signal line 10, and the excitation transducer 33 emits a longitudinal wave pulse signal with a frequency of 1 MHz, which is transmitted to the second ultrasonic transducer after penetrating the sample. 40 Receive, the received signal is transmitted to the oscilloscope through the second ultrasonic signal line 20 and displayed, the digital oscilloscope collects a series of waveform data, the signal is digitized and displayed and adjusted and transmitted to the computer through the network interface, the computer can display and store the data, and can Complete post-processing of waveforms and data.

The thermal conductivity test system can use the thermal analyzer from Hotdisk AB as the analytical instrument. The thermal conductivity sensor 37 includes a double helix probe body, a circular protective film covering the double helix probe body, and the double helix probe body is connected to the double helix probe body through a welding point protective sleeve. One end of the heat conducting probe lead 16 is connected, and the other end of the heat conducting probe lead 16 is connected to the thermal analyzer.

The resistivity test system can use a conventional digital four-point probe tester, and the four-pointer resistance probe 41 can use the most commonly used linear four-point probe. The needle tips of the four probes are on the same line, and the distances are equal, all of which are S. Generally, a distance of 0.5mm is used. Different probe distances need to be corrected accordingly to the measurement results. The material of the probe is preferably stainless steel.

In this embodiment, the reactor 35 is a drum made of polytetrafluoroethylene. Before the test, remove the bolt 14 of the device shell, then use the guide rail bracket 2 to push the left part of the device away, then use the reactor rotator 42 to place the reactor 35 vertically, and use the reactor bottom piston push-pull system 28 to push the reactor bottom piston 30 The bottom of the reactor 35 is sealed. A sediment sample 36 with a certain moisture content is put in, and the device casing is sealed. In order to eliminate the interference of residual air in the device, connect the vacuuming system to the gas inlet and outlet 18, open the vacuuming system and valve to start vacuuming the device, after about 15 minutes, the vacuuming is completed, close the valve, and connect the intake system to intake (for example, methane). After the pressure is equilibrated, the constant temperature bath 21, the data acquisition instrument and the computer are turned on to monitor the progress of the reaction. After the reaction is completed, the reactor bottom piston 30 is slowly pulled by the reactor bottom piston push-pull system 28 to separate the reactor bottom piston 30 from the reactor 35 . After separation, a 90-degree rotation can be performed by the reactor rotator 42 . When the reactor 35 is placed horizontally, by moving the first piston rod 6 and the second piston rod 39, the sediment sample can be kept in a cylindrical shape and the acoustic wave transmission characteristic test can be performed. When the sound wave transmission characteristic is tested, the second piston rod 39 is moved away from the sample by the second piston rod push-pull system 19. Use the thermal conductivity test probe push-pull system 17 to push the thermal conductivity test probe 38 to the coaxial position of the sample 36, and use the second piston rod push-pull system 19 to move the second piston rod 39 against the back of the thermal conductivity test probe 38 so that the thermal conductivity test probe 38 and the sample 36 and the first piston rod 6 are coaxial and in close contact, and then the thermal conductivity characteristics of the sample are tested. After the thermal conductivity test is completed, use the first piston rod push-pull system and the second piston rod push-pull system 19 to move the first piston rod 6 and the second piston rod 39 to make the sample 36 leave the thermal conductivity test probe 38, and then use the thermal conductivity test probe push-pull system 17 Pull the thermally conductive test probe 38 out. Use the resistivity test probe push-pull system 27 to push the four-probe resistance probe 41 to the coaxial position of the sample 36, and use the first piston rod push-pull system and the second piston rod push-pull system 19 to move the first piston rod 6 and the second piston rod 39. Make the second piston rod 39 close to the back of the four-point probe resistance probe 41, make the four-point probe resistance probe 41, the sample 36 and the first piston rod 6 coaxial and close to each other, and then carry out the resistance characteristic test of the sample. After the resistance characteristic test is completed, use the first piston rod push-pull system and the second piston rod push-pull system 19 to move the first piston rod 6 and the second piston rod 39 to make the sample 36 leave the four-probe resistance probe 41, and then use the resistivity test The probe push-pull system 27 pulls the four-point probe resistance probe 41 out. Change the temperature for the next round of testing.

The above detailed description is a specific description of a feasible embodiment of the present invention, and the embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or modification without departing from the present invention should be included in the patent scope of this case middle.

Claims (9)

1. A hydrate in-situ synthesis and a comprehensive physical property testing device, characterized in that: comprising a reactor that is arranged in a sealed casing and has a test sample built in, a thermal conductivity test system for measuring the thermal conductivity of the sample, a For the resistivity test system for measuring the resistivity of the sample, the ultrasonic test system for measuring the sound wave velocity of the sample, and the constant temperature bath system communicated with the sealed shell through the pipeline, the thermal conductivity test system and the resistivity test system can be moved relatively. It is arranged at the upper and lower positions of one end of the reactor and can be in contact with the reactor, and the ultrasonic testing system is horizontally arranged at both ends of the reactor and is connected with the reactor; The ultrasonic testing system includes an ultrasonic injection system and an ultrasonic derivation system that are oppositely arranged at both ends of the reactor and have the same structure. The ultrasonic injection system is fixedly connected to one end of the reactor, and the ultrasonic derivation device can be horizontally displaced, thereby Can be in contact with the other end of the reactor; the ultrasonic injection system includes a piston rod connected with the reactor at one end, and the other end of the piston rod is connected to a piston rod push-pull system through the side of the sealed shell , an ultrasonic transducer spring and an ultrasonic transducer are arranged inside the piston rod, and the ultrasonic transducer spring is located at the end of the ultrasonic transducer away from the test sample, which can make the ultrasonic transducer close to the The inner wall of the piston rod cavity. 2 . The in-situ synthesis of hydrate and its comprehensive physical property testing device according to claim 1 , wherein the piston rod push-pull system comprises a threaded pressure rod, and the threaded pressure rod and the piston rod pass through a coupling. 3 . A runner is fixed at the outer end of the threaded pressure rod. The runner is supported by a runner support structure. One end of the runner support structure is connected to the threaded pressure rod, and the other end is fixed to the sealing shell. outer wall of the body. 3. The in-situ synthesis of hydrate and its comprehensive physical property testing device according to claim 2, characterized in that: a positioning rod is arranged on the piston rod, a displacement sensor L is arranged on the outer wall of the sealed casing, and the The positioning rod is connected to the displacement sensor L through a measuring rod, the position information of the positioning rod can be obtained from the displacement sensor L, and the length of the sample can be calculated by the displacement sensor signals of the ultrasonic injection system and the ultrasonic derivation system. 4. The in-situ synthesis of hydrate and its comprehensive physical property testing device according to claim 2, characterized in that: the thermal conductivity testing system comprises a thermal conductivity testing probe, and the thermal conductivity testing probe is arranged on the side facing the reactor There is a thermal conductivity sensor, and the thermal conductivity test probe is threadedly connected to a thermal conductivity test probe push-pull system. The thermal conductivity test probe push-pull system has the same structure as the piston rod push-pull system. The thermal conductivity test probe can be pushed to the coaxial position of the sample or pulled. away from the sample, the thermal conduction test probe is provided with a thermal conduction probe lead, and the thermal conduction sensor is connected to the data acquisition device of the thermal conduction characteristic testing system through the thermal conduction probe lead. 5. The in-situ synthesis of hydrate and its comprehensive physical property testing device according to claim 2, characterized in that: the resistivity testing system comprises a four-probe resistance probe, a four-probe resistance probe lead and a resistivity test probe push-pull The structure of the resistivity test probe push-pull system is the same as that of the piston rod push-pull system. The data analysis and acquisition system of the four-point probe resistance probe and the resistivity test system are connected through the four-point probe resistance probe lead, and the four-point resistance probe and resistivity test The probe push-pull system is threaded to push the four-point probe resistance probe to the coaxial position of the sample or pull it away from the sample. 6 . The in-situ synthesis of hydrate and its comprehensive physical property testing device according to claim 1 , wherein the constant temperature bath system comprises a constant temperature bath and corresponding connecting pipes, and the sealing shell is provided with corresponding inlet and outlet pipes. 7 . A water interface, the constant temperature bath is connected to the water inlet and outlet interfaces through the connecting pipe to form a water flow loop to keep the temperature of the reactor constant. 7 . The in-situ synthesis of hydrates and the device for testing their comprehensive physical properties according to claim 1 , wherein the sealed shell sequentially comprises a thermal insulation shell, a water jacket, and a stainless steel inner shell from the outside to the inside, and the sealed shell The housing includes left and right parts, which are connected by bolts and sealed by ring seals. 8. The in-situ synthesis of hydrate and its comprehensive physical property testing device according to claim 2, characterized in that: the bottom of the inner wall of the sealed shell is provided with a reactor bottom piston, and the reactor is supported by a reactor support at the bottom of the reactor. On the bottom piston of the reactor, a reactor bottom piston push-pull system is arranged below the reactor bottom piston, and the structure of the reactor bottom piston push-pull system is the same as that of the piston rod push-pull system. 9 . The in-situ synthesis of hydrate and its comprehensive physical property testing device according to claim 8 , wherein the side wall of the reactor is provided with a reactor rotator, and the reactor support is connected to the side of the reactor. 10 . The wall shaft is connected, and the reactor can be rotated by rotating the reactor rotator.

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