Natural gas hydrate sample preparation device and preparation method

Abstract

The invention relates to a natural gas hydrate sample preparation device which comprises a body, the body is made of a flexible material capable of achieving pressure transmission, an inner cavity for containing a sample is defined in the body, and a feeding channel capable of being communicated with the inner cavity is further arranged at the lower end of the body; the pressure system comprises an axial pressure assembly and a confining pressure assembly, and the axial pressure assembly and the confining pressure assembly can apply axial pressure and confining pressure to the body respectively, so that in-situ consolidation of the sample can be realized; the monitoring system can be used for monitoring the state change in the sample preparation process in real time.

Description

Technical Field

[0001] The invention relates to a natural gas hydrate sample preparation device and a natural gas hydrate sample preparation method. Background Art

[0002] With the rapid development of the economy and society, the development of conventional fossil energy can no longer meet the continuous growth of human energy demand. Therefore, unconventional oil and gas resources are increasingly valued. Among them, natural gas hydrates are one of the important unconventional oil and gas resources.

[0003] Natural gas hydrates are cage-shaped, solid, crystalline compounds composed of water and gas molecules under high-pressure, low-temperature conditions. They are widely distributed in submarine strata and permafrost zones. Research has shown that natural gas hydrates have abundant geological reserves, extremely high energy density, and minimal pollution, making them considered one of the most promising energy sources for future development. Consequently, researchers have begun research into the exploration and development of natural gas hydrates.

[0004] Due to the demanding phase equilibrium conditions and hostile environments of hydrates, obtaining hydrate sediment samples is extremely difficult. Given the limited availability of field hydrate samples, it is crucial to use a large number of synthetic hydrate sediment specimens for mechanical experiments.

[0005] Currently, there are two main methods for artificially preparing hydrate samples: mixed sampling and in-situ generation. The mixed sampling method involves mixing and pressing pure natural gas hydrates with a sediment skeleton. This method offers the advantages of quick sample preparation and uniform hydrate distribution, but it also has high environmental requirements. The in-situ generation method, on the other hand, involves preparing hydrate samples within a triaxial pressure chamber. This method offers the advantage of shortened experimental cycles and eliminates the need for additional cold storage to maintain ambient temperature, but it places higher demands on experimental equipment and costs. Summary of the Invention

[0006] In response to the above technical problems, the present invention aims to provide a natural gas hydrate sample preparation device and preparation method. The natural gas hydrate sample preparation device of the present invention can not only reduce the requirements for the natural gas hydrate preparation environment, but also reduce the experimental equipment requirements and save preparation costs.

[0007] According to a first aspect of the present invention, a natural gas hydrate sample preparation device is provided, comprising a body made of a flexible material capable of transmitting pressure, defining an inner cavity for accommodating the sample within the body, and a feed channel disposed at a lower end of the body and communicating with the inner cavity;

[0008] a pressure system, the pressure system comprising an axial pressure assembly and a confining pressure assembly, the axial pressure assembly and the confining pressure assembly being capable of applying axial pressure and confining pressure to the body, respectively, thereby enabling in-situ consolidation of the sample;

[0009] A monitoring system is provided, wherein the monitoring system can monitor the state changes during the sample preparation process in real time.

[0010] In a preferred embodiment, the axial pressure assembly includes a piston cavity connected to the upper end of the body, a piston is provided in the piston cavity, and the piston is configured to be able to extend into the inner cavity in an axially sealed manner and to be connected with the sample, thereby being able to apply axial pressure to the sample.

[0011] In a preferred embodiment, the piston includes a piston body capable of moving in the piston cavity and a partition mounted on the outer wall of the piston body, wherein the partition is configured to be connected to the inner wall of the piston cavity, thereby dividing the piston cavity into an upper chamber and a lower chamber.

[0012] The upper chamber and the lower chamber respectively have a first ventilation line communicating with the outside.

[0013] In a preferred embodiment, the confining pressure assembly includes an outer shell sealedly sleeved on the periphery of the main body, an annular pressure chamber is formed between the outer shell and the main body, and the pressure chamber has a second ventilation line connected to the outside.

[0014] In a preferred embodiment, the lower end of the piston body is configured to extend out of the piston cavity in a sealed manner, and a closable discharge channel is provided in the piston and axially penetrates the piston.

[0015] In a preferred embodiment, a heating element is further provided in the pressure chamber.

[0016] In a preferred embodiment, a temperature control element is sleeved on the outer wall of the outer shell, and the temperature control element is configured as a water bath.

[0017] In a preferred embodiment, the monitoring system includes an axial displacement sensor connected to the piston and capable of detecting the piston's movement distance, at least one radial displacement sensor sleeved on the outer wall of the body, and acoustic wave probes arranged at both ends of the sample.

[0018] In a preferred embodiment, a first sealing member capable of sealing the lower end of the body is further provided at the lower end of the body, and the first sealing member is configured as a twist-type rubber plug capable of extending into the body from the lower end of the body.

[0019] In a preferred embodiment, step portions are further provided on the side walls of the two end portions of the body, so that the diameter of the ends of the body is larger than the diameter of the axial middle portion of the body, thereby forming gaps between the two ends of the body and the piston and the first seal respectively.

[0020] A second sealing member is sleeved on the outer walls of the piston body and the end of the first sealing member extending into the main body. The second sealing member has an extension portion extending into and sealing the gap.

[0021] According to a second aspect of the present invention, a method for preparing a natural gas hydrate sample is provided, which is performed using the natural gas hydrate sample preparation device described above, and the method comprises:

[0022] Step 1: Fully mix the mixed sand and a certain proportion of water to form unsaturated wet sand, then fill the wet sand into the body and compact it to form a sample, and then install the radial displacement sensor on the outer wall of the body;

[0023] Step 2: inserting the sonic probe into the piston body and the first sealing member respectively, and then extending the piston body and the first sealing member into the main body respectively until the piston body and the first sealing member are in contact with the sample;

[0024] Step 3: Install the heating element and the temperature control element on the outer shell, and install the main body into the outer shell, then connect the axial displacement sensor to the piston body, and connect the first ventilation line and the second ventilation line;

[0025] Step 4: Connect the axial displacement sensor, radial displacement sensor, acoustic wave probe, heating element and temperature control element to the computer and check whether each device is connected properly;

[0026] Step 5: Introduce high-pressure gas into the first ventilation pipeline and the second ventilation pipeline respectively, apply axial pressure and confining pressure to the sample, and collect monitoring data from the axial displacement sensor and the radial displacement sensor. After the rock sample is consolidated for a predetermined time, remove the axial pressure and confining pressure;

[0027] Step 6: introducing natural gas into the body through the feed channel and heating the body through the heating element until the gas and liquid remaining in the sample are discharged, then closing the discharge channel and adjusting the temperature of the body to a predetermined value through the temperature control element;

[0028] Step 7: A fixed amount of reaction liquid and natural gas are introduced into the sample according to the desired saturation of the sample, and then the sample is kept warm for a certain period of time by a temperature control element. During this process, the formation of hydrates is monitored by an acoustic probe;

[0029] Step 8: After the hydrate is formed, conduct hydrate mechanics experiments according to the experimental requirements and take photos for preservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be described below with reference to the accompanying drawings.

[0031] Figure 1 A schematic diagram of a natural gas hydrate sample preparation device according to an embodiment of the present invention is shown.

[0032] Figure 2 for Figure 1 Schematic diagram of the axial compression assembly of the gas hydrate sample preparation apparatus is shown.

[0033] Figure 3 for Figure 1 Schematic diagram of the main body of the natural gas hydrate sample preparation device is shown.

[0034] In this application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn to scale. DETAILED DESCRIPTION

[0035] The present invention will be described below with reference to the accompanying drawings.

[0036] Figure 1 FIG. 1 shows a schematic diagram of a natural gas hydrate sample preparation device 100 according to an embodiment of the present invention. Figure 1 As shown, the natural gas hydrate sample preparation device 100 includes a body 10. The body 10 may be configured as a cylinder, for example, and defines an inner cavity 20 capable of accommodating a sample 21.

[0037] like Figure 1 As shown, a closable feed channel 22 that can communicate with the inner cavity 20 is also provided at the lower end of the main body 10, so that the operator can pass natural gas or other gas or liquid required for sample preparation into the inner cavity 20 through the feed channel 22.

[0038] Furthermore, a pressure system 30 and a monitoring system 60 are provided on the outside of the body 10. The pressure system 30 includes an axial pressure assembly 40 and a confining pressure assembly 50. The axial pressure assembly 40 and the confining pressure assembly 50 are capable of applying axial pressure and confining pressure, respectively, to the body 10, thereby achieving in-situ consolidation of the specimen 21. The monitoring system 60 is capable of real-time monitoring of state changes during specimen preparation.

[0039] like Figure 1As shown, the axial pressure assembly 40 includes a piston cavity 42 connected to the upper end of the body 10. A piston 44 is provided in the piston cavity 42, and the piston 44 can move in the piston cavity 42 under the action of an external force. At the same time, the piston 44 is configured to be compatible with the inner cavity 20, so that the piston 44 can extend into the inner cavity 20 in an axially sealed manner along the axial direction of the body 10. After the piston 44 extends into the inner cavity 20, as the piston 44 continues to move downward under the action of an external force, the piston 44 can connect with the sample 21 and squeeze the sample 21 in the axial direction, thereby applying axial pressure to the sample 21.

[0040] Specifically, the piston 44 includes a piston body 442 that can move within the piston chamber 42, and a partition 445 that is sleeved on the outer wall of the piston body 442. The partition 445 is configured to be in contact with the inner wall of the piston chamber 42, thereby separating the piston chamber 42 into an upper chamber 422 and a lower chamber 424 that are isolated from each other.

[0041] At the same time, first ventilation lines 425 for communication with the outside are respectively provided on the upper chamber 422 and the lower chamber 424. The two first ventilation lines 425 are respectively connected to a gas source 426. Therefore, when it is necessary to apply axial pressure to the sample 21, the operator only needs to introduce high-pressure gas into the upper chamber 422 through the first ventilation line 425. The piston 44 moves downward under the action of the gas pressure, thereby expelling the gas in the lower chamber 424, until the piston 44 contacts the sample 21 and squeezes the sample 21, applying axial pressure to the sample 21.

[0042] Similarly, when the axial pressure applied to the sample 21 needs to be released after the pressurization is completed, the operator only needs to introduce high-pressure gas into the lower chamber 424 through the first ventilation line 425, so that the piston 44 moves upward under the action of the gas pressure, thereby discharging the gas in the upper chamber 422 until the piston 44 is separated from the sample 21.

[0043] In this way, not only can the operating steps of applying axial pressure to the sample 21 be effectively simplified, but the pressure difference between the upper chamber 422 and the lower chamber 424 can also be adjusted by controlling the ventilation volume of the first ventilation line 425, thereby helping to accurately control the axial pressure exerted on the sample 21.

[0044] In a preferred embodiment, pressure gauges (not shown) are respectively provided on the two first ventilation lines 425, and the pressure gauges are used to monitor the air pressure changes in the upper chamber 422 and the lower chamber 424 in real time, thereby helping the operator to monitor the axial pressure exerted on the sample 21 in real time.

[0045] like Figure 1 As shown, the confining pressure assembly 50 includes an outer shell 52 that is sealedly mounted on the outer periphery of the body 10. An annular pressure chamber 54 is formed between the outer shell 52 and the body 10. The pressure chamber 54 has a second ventilation line 56 connected to the outside. Thus, an operator can introduce high-pressure gas into the pressure chamber 54 through the second ventilation line 56 to control the air pressure within the pressure chamber 54.

[0046] Essentially, the body 10 is made of a flexible material so that it can deform under the pressure applied by the pressure chamber 54 and transmit the pressure applied by the pressure chamber 54 to the sample 21 in the inner cavity 20, thereby applying a confining pressure to the sample 21. When the confining pressure needs to be released, the high-pressure gas in the pressure chamber 54 can be discharged through the second vent line 56.

[0047] Similarly, a pressure gauge is also provided on the second ventilation line 56 , and the pressure gauge is used to monitor the air pressure changes in the pressure chamber 54 in real time, thereby helping the operator to control the confining pressure of the sample 21 in real time.

[0048] To sum up, the gas and liquid required for preparing the sample 21, such as natural gas, can be introduced into the inner cavity 20 through the feed channel 22, and the axial pressure component 40 and the confining pressure component 50 can respectively apply axial pressure and confining pressure to the main body 10, thereby helping to achieve in-situ consolidation of the sample 21, thereby completing the sample preparation operation.

[0049] In a preferred embodiment, a flow meter 221 is further provided on the feed channel 22. The flow meter can monitor the flow of natural gas and other reaction liquids entering the inner cavity 21 in real time, thereby helping the experimenter to control the amount of natural gas and other reaction liquids entering the sample 21, thereby obtaining samples 21 with different saturations according to experimental needs.

[0050] Figure 2 for Figure 1 FIG. 1 is a schematic diagram of the axial pressure assembly 40 of the natural gas hydrate sample preparation device 100. Figure 2 As shown, the upper end of the piston body 442 is configured to extend out of the piston cavity 42 in a sealed manner. Furthermore, a discharge channel 48 is provided within the piston body 442, extending axially therethrough. A cover 482 is provided at the upper end of the discharge channel 48 to seal the discharge channel 48. Thus, when the discharge channel 48 is open, the sample 21 can communicate with the outside through the discharge channel 48.

[0051] Therefore, before achieving in-situ consolidation of sample 21, operators can open the discharge channel 48 and introduce a small amount of high-pressure natural gas through the feed channel 22. As the high-pressure natural gas moves upward along the sample 21, it can expel the air and liquid impurities remaining in the sample 21 and transport them to the exterior of the body 10 through the discharge channel 48. This arrangement can reduce the impact of impurities remaining in the sample 21 on the sample preparation process before the sample 21 is prepared, thereby more accurately simulating the formation process of the natural gas hydrate sample.

[0052] Furthermore, if Figure 1 As shown, a heating element 58 is further provided in the pressure chamber 54. The heating element 58 can be, for example, a thermal resistor. The heating element 58 can heat the sample 21 to a high temperature, thereby facilitating the complete discharge of liquid impurities in the sample 21.

[0053] A temperature control element 53 is also mounted on the outer wall of the outer shell 52. This temperature control element 53 can be, for example, a water bath. This water bath can quickly lower the temperature of the main body 10 after liquid impurities in the sample 21 are completely discharged, allowing the main body 10 to quickly return to the predetermined operating temperature. Furthermore, the water bath allows operators to control the temperature of the main body 10 based on on-site needs to facilitate experimental requirements.

[0054] In a preferred embodiment, a first sealing member 16 is further provided at the lower end of the body 10. The first sealing member 16 may be, for example, a twistable piston. The first sealing member 16 can extend from the lower end of the body 10 into the body 10, thereby sealing the lower end of the body 10. Furthermore, the feed channel 22 is configured to axially penetrate the first sealing member 16, thereby enabling communication between the inner cavity 20 and the exterior of the body 10.

[0055] Figure 3 for Figure 1 FIG. 1 is a schematic diagram of the main body 10 of the natural gas hydrate sample preparation device 100. Figure 1 and Figure 3 As shown, steps 17 are provided on the sidewalls at both ends of the body 10, so that the diameter of the ends of the body 10 is larger than the diameter of the axial middle portion of the body 10. Therefore, when the piston body 442 and the first sealing member 16 are inserted into the body 10, gaps 18 are formed between the piston body 442 and the upper end of the body 10, and between the first sealing member 16 and the lower end of the body 10.

[0056] At the same time, a second sealing member 19 is sleeved on the outer wall of the piston body 44 and the end 162 of the first sealing member 16 that extends into the body 10. An extension 192 is provided on the second sealing member 19. The extension 192 can extend into and close the gap 18, thereby further improving the sealing effect of the body 10.

[0057] like Figure 1 As shown, the monitoring system 60 includes an axial displacement sensor 62 connected to the piston 44 , a radial displacement sensor 64 sleeved on the outer wall of the body 10 , and an acoustic wave probe 66 connected to the sample 10 .

[0058] Specifically, the axial displacement sensor 62 is mounted on the upper end of the piston 44. As the piston body 442 continues to move downward under pressure, the axial displacement sensor 62 can detect the displacement of the piston body 442. It is easy to understand that after the lower end of the piston body 442 contacts the specimen 21, the distance the piston body 442 continues to move downward is equal to the axial compression of the specimen 21.

[0059] The radial displacement sensor 64 is configured to be sleeved on the outer side of the body 10. During the preparation of the sample 21, the outer wall of the sample 21 is always in contact with the inner wall of the body 10. Therefore, as the sample 21 is axially compressed, its radial diameter increases accordingly. During this process, the diameter of the body 10 can change synchronously with the change in the diameter of the sample 21. Therefore, by sleeved on the outer wall of the body 10, the radial displacement sensor 64 can monitor the diameter change of the body 10, and thus detect the diameter change of the sample 21.

[0060] like Figure 1 As shown, grooves 662 are respectively provided on the first seal 16 and the end of the piston body 442 proximal to the sample 21. The acoustic wave probe 66 is disposed within the grooves 662, allowing it to engage both axial ends of the sample 21 and communicate with a computer 664 via a wire. The acoustic wave probe 66 monitors changes in the porosity within the sample 21 in real time during compression and transmits the monitoring data to the computer 664 in real time. This allows operators to collect and process the monitoring data from the acoustic wave probe 66.

[0061] The working process of the natural gas hydrate sample preparation device 100 according to the present invention is briefly described below.

[0062] The natural gas hydrate sample preparation device 100 of the present invention is used for preparing and testing natural gas hydrate samples. During the preparation process, the operator first mixes mixed sand with a certain proportion of water to form unsaturated wet sand. The wet sand is then filled into the main body 10 and compacted to form the sample 21. Subsequently, the radial displacement sensor 64 is mounted on the outer wall of the main body 10.

[0063] Subsequently, the operator needs to install the ultrasonic probe 66 into the piston body 442 and the first seal 16 respectively, and then extend the piston body 442 and the first seal 16 into the main body respectively until the piston body 442 and the first seal 16 are in contact with the sample 21.

[0064] At this point, the operator can install the heating element 58 and the temperature control element 53 on the outer shell 52, and install the body 10 into the outer shell 52. Then, the axial displacement sensor 62 is connected to the piston body 442, and the first ventilation line 425 and the second ventilation line 56 are connected.

[0065] After the first ventilation line 425 and the second ventilation line 56 are connected, the operator can connect the axial displacement sensor 62, radial displacement sensor 64, ultrasonic probe 66, heating element 58 and temperature control element 53 to the computer 664 to check whether each device is connected normally.

[0066] Subsequently, the operator can introduce high-pressure gas into the first ventilation pipeline 425 and the second ventilation pipeline 56 respectively, apply axial pressure and confining pressure to the sample 21, and collect monitoring data from the axial displacement sensor 62 and the radial displacement sensor 64. After the rock sample is consolidated for a predetermined time, the axial pressure and confining pressure are removed.

[0067] After the confining pressure is removed, the operator can introduce natural gas into the main body 21 through the feed channel 22 and heat the main body 10 through the heating element 58 until the residual gas and liquid in the sample 21 are discharged. The discharge channel 48 is then closed and the temperature of the main body 10 is adjusted to a predetermined value through the temperature control element.

[0068] As the temperature of the main body 10 drops to a predetermined value, the operator can introduce a predetermined amount of reaction liquid and natural gas into the sample 21, based on the desired saturation level. The sample is then maintained at this temperature for a predetermined period of time using the temperature control element 53. During this process, hydrate formation can be monitored using an acoustic wave probe 66. Once hydrate formation is complete, hydrate mechanics experiments are conducted according to experimental requirements, and photographs are taken for preservation. This completes the entire natural gas hydrate preparation and testing process.

[0069] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of the present invention.

Claims

1. A natural gas hydrate sample preparation device, comprising: A body, wherein the body is made of a flexible material capable of achieving pressure transmission, an inner cavity for accommodating a sample is defined within the body, and a feed channel capable of communicating with the inner cavity is also provided at the lower end of the body; A pressure system, the pressure system comprising an axial pressure assembly and a confining pressure assembly, the axial pressure assembly and the confining pressure assembly can respectively apply axial pressure and confining pressure to the body, thereby achieving in-situ consolidation of the sample, and, A monitoring system is provided, wherein the monitoring system can monitor the state changes during the sample preparation process in real time.

2. The natural gas hydrate sample preparation device according to claim 1, characterized in that: The axial pressure assembly includes a piston cavity connected to the upper end of the body, a piston is arranged in the piston cavity, and the piston is arranged to be able to extend into the inner cavity in an axial sealed manner and to be able to connect with the sample, so as to apply axial pressure to the sample.

3. The natural gas hydrate sample preparation device according to claim 2, characterized in that: The piston comprises a piston body capable of moving in the piston cavity and a partition plate sleeved on the outer wall of the piston body, wherein the partition plate is configured to be able to connect with the inner wall of the piston cavity, thereby dividing the piston cavity into an upper chamber and a lower chamber. The upper chamber and the lower chamber respectively have a first ventilation line communicating with the outside.

4. The natural gas hydrate sample preparation device according to claim 3, characterized in that: The confining pressure assembly comprises an outer shell body which is sealed and sleeved on the outer periphery of the main body. An annular pressure chamber is formed between the outer shell body and the main body. The pressure chamber has a second ventilation line connected to the outside.

5. The natural gas hydrate sample preparation device according to claim 4, characterized in that: The upper end of the piston body is arranged to extend out of the piston cavity in a sealed manner, and a closable discharge passage is arranged in the piston and penetrates the piston in the axial direction.

6. The natural gas hydrate sample preparation device according to claim 5, characterized in that: A heating element is also arranged in the pressure chamber.

7. The natural gas hydrate sample preparation device according to claim 6, characterized in that: A temperature control element is also sleeved on the outer wall of the outer shell, and the temperature control element is configured as a water bath.

8. The natural gas hydrate sample preparation device according to any one of claims 2 to 7, characterized in that: The monitoring system comprises an axial displacement sensor connected to the piston and capable of detecting the moving distance of the piston, at least one radial displacement sensor sleeved on the outer wall of the body, and acoustic wave probes arranged at both ends of the sample.

9. The natural gas hydrate sample preparation device according to claim 8, characterized in that: A first sealing member capable of sealing the lower end of the body is also provided at the lower end of the body. The first sealing member is configured as a twist-type rubber plug capable of extending into the body from the lower end of the body.

10. The natural gas hydrate sample preparation device according to claim 9, characterized in that: Steps are also provided on the side walls of the two ends of the body, so that the diameters of the two ends of the body are larger than the diameter of the axial middle of the body, so that gaps are formed between the two ends of the body and the piston and the first sealing member, respectively. A second sealing member is sleeved on the outer walls of the piston body and the end of the first sealing member extending into the main body, and the second sealing member has an extension portion extending into and sealing the gap.

11. A method for preparing a natural gas hydrate sample, using the natural gas hydrate sample preparation device according to claim 9 or 10, the method comprising: Step 1: fully mix the mixed sand and a certain proportion of water into unsaturated wet sand, then fill the wet sand into the body and compact it to form a sample, and then set the radial displacement sensor on the outer wall of the body; Step 2: inserting the sonic wave probe into the piston body and the first sealing member respectively, and then extending the piston body and the first sealing member into the main body respectively, until the piston body and the first sealing member are in contact with the sample; Step 3: Install the heating element and the temperature control element on the outer shell, and install the main body into the outer shell, then connect the axial displacement sensor to the piston body, and connect the first ventilation line and the second ventilation line at the same time; Step 4: Connect the axial displacement sensor, radial displacement sensor, sonic probe, heating element and temperature control element to the computer, and check whether each device is connected normally; Step 5: Introduce high-pressure gas into the first ventilation pipeline and the second ventilation pipeline respectively, apply axial pressure and confining pressure to the sample, and collect monitoring data of the axial displacement sensor and the radial displacement sensor. After the rock sample is consolidated for a predetermined time, remove the axial pressure and confining pressure; Step 6: introducing natural gas into the body through the feed channel, and heating the body through the heating element until the gas and liquid remaining in the sample are discharged, then closing the discharge channel, and adjusting the temperature of the body to a predetermined value through the temperature control element; Step 7: A certain amount of reaction liquid and natural gas are introduced into the sample according to the required saturation of the sample, and then the sample is kept warm for a certain period of time by a temperature control element. During this process, the formation of hydrates is monitored by an acoustic wave probe; Step 8: After the hydrate is formed, conduct hydrate mechanics experiments according to the experimental requirements and take photos for preservation.

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