On-site sample cutting and transfer device for natural gas hydrate

Abstract

The present invention relates to the technical field of natural gas hydrate exploitation, and specifically to an on-site sample cutting and transfer device for a natural gas hydrate. The device comprises a servo transmission mechanism, a pressure-resistant operator, a high-pressure sealed operation mechanism, a pressure maintaining unit and a data acquisition system. During operation, a servo operation transmission mechanism is configured to drive a pressure-resistant manipulator to reciprocatingly move; a servo rotary mechanism is configured to hold a sample and then implement 360-degree rotation of the sample, and the pressure-resistant manipulator is configured to drive a gripper to grab the sample, assist a sample cutting unit in cutting the sample in cooperation with a high-pressure sealed mechanism, and reciprocatingly move under the action of the servo operation transmission mechanism; the cut sample is placed in a high-pressure maintaining compartment for storage; and during the whole cutting process, system pressure acquisition is performed by means of a pressure acquisition system, and data is transmitted to a data acquisition and control system for data processing and analysis.

Description

A natural gas hydrate on-site sample cutting and transfer device Technical field:

[0001] The present invention relates to the technical field of natural gas hydrate mining, in particular to a natural gas hydrate on-site sample cutting and transferring device. Background technology:

[0002] Deepwater oil and gas resources are considered a key frontier for the oil industry. Deepwater and ultra-deepwater oil and gas resources have become a hotspot for development in Western developed countries such as the United States and the United Kingdom. Natural gas hydrates, primarily buried at depths of 1-3 km, are widely considered to be a vast, untapped unconventional oil and gas resource and one of the most promising alternative energy sources of the 21st century. This immense resource potential is attracting countries around the world to deepen their exploration, trial production, and supporting environmental impact assessments. The United States, Canada, Germany, Norway, and neighboring countries such as Japan, India, South Korea, and Vietnam have all established long-term research programs on natural gas hydrates.

[0003] With the continuous deepening of natural gas hydrate research, a number of test devices have been developed to simulate the hydrate formation and extraction process. However, as the research continues to deepen, the requirements for such test devices are becoming increasingly higher. The current domestic and international requirements for natural gas hydrate test simulation devices are roughly as follows:

[0004] (1) The comprehensiveness of the test is becoming stronger

[0005] With the continuous advancement of scientific research, it has evolved from a single, interdisciplinary, and integrated approach. The design requirements for natural gas hydrate simulation test facilities have also evolved from single-function requirements to integrated, systematic ones. Research has found that current natural gas hydrate simulation test facilities can not only simulate the physical and chemical relationships of hydrates, but also simulate hydrate sedimentary formations, test the physical and chemical properties of the formations with and without hydrate formation, and study the characteristics of hydrate formation parameters.

[0006] (2) The degree of visualization is getting higher and higher

[0007] Macroscopic science, once developed to a certain point, is no longer sufficient to explain active physical phenomena. To analyze and understand the various mechanisms and characteristics of natural gas hydrates as clearly as possible, higher functional requirements are being placed on experimental simulation systems. The goal is to use visualization technology to capture real-time phase changes in natural gas hydrate formation, aggregation, and decomposition within the formation. Furthermore, other testing equipment can be used to observe, record, and analyze the microscopic world of the research object.

[0008] (3) The environmental conditions of test simulation are becoming more and more harsh

[0009] As field sampling of natural gas hydrates continues to deepen, the environment in which they form is becoming increasingly clear, posing new challenges for the test simulation system. Intense formation pressure and low ambient temperatures are essential for the formation of natural gas hydrates. Creating these conditions places higher demands on the test simulation system. Key areas of research and design for the test system include precisely controlling the simulation environment, ensuring the proper functioning of each test device under these harsh conditions, and ensuring high structural reliability.

[0010] (4) Measurement accuracy is getting higher and higher

[0011] To accurately interpret the accumulation state of natural gas hydrates and the impact of mining methods on the formation, truly reflect the various characteristics of natural gas hydrates in the formation, and understand and master the various mechanistic relationships, higher requirements are placed on the testing capabilities of the test simulation system. High-precision measurement and high-precision control are necessary prerequisites for achieving accurate simulation. To achieve this goal, in addition to selecting reliable and accurate sensors, higher requirements are also placed on the design plan. The reasonable arrangement and use of various components and equipment such as sensors are also important factors affecting the measurement accuracy of the test simulation device.

[0012] The submarine methane hydrate reservoir is a multi-phase, multi-component, complex sediment system composed of natural gas, water, hydrates, ice, sand, etc. Different methane hydrate reservoir conditions will result in significant differences in mining techniques and mining results. Therefore, the on-site characterization technology of key geological parameters of the target methane hydrate reservoir is one of the most critical technical means to detect methane hydrate before mining. It is also the basis for further accurate prediction of the methane hydrate production capacity in the target area and determination of the mining plan. At present, the on-site characterization of marine methane hydrate reservoir parameters and online production capacity evaluation have become key technical issues in the commercial mining of methane hydrate. It is urgent to carry out special research and development to establish a mature technology and special equipment system.

[0013] However, in the existing technology, there are the following technical difficulties: there is currently no device in the existing technology that can realize the cutting, transfer and segmented storage of methane hydrate seabed in-situ pressure-maintained samples in any size under pressure-maintaining conditions.

[0014] Summary of the invention:

[0015] The purpose of the present invention is to solve the technical difficulties existing in the prior art and provide a natural gas hydrate on-site sample cutting and transferring device.

[0016] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0017] A natural gas hydrate on-site sample cutting and transferring device, comprising a servo transmission mechanism, a pressure-resistant operator, a high-pressure sealing operating mechanism, a pressure-maintaining unit, and a data acquisition system;

[0018] The servo transmission mechanism is connected to the pressure-resistant operator, the high-pressure sealing operating mechanism and the pressure-maintaining unit in sequence; wherein the high-pressure sealing operating mechanism includes a cutting unit and a sealing unit;

[0019] During operation, the servo transmission mechanism drives the sample to reciprocate or rotate in the pressure-resistant operator. After the sample enters the high-pressure sealing operation unit, the cutting unit cuts the sample, and the cut sample enters the pressure holding unit for storage.

[0020] As an improvement to the technical solution of the natural gas hydrate on-site sample cutting and transferring device of the present invention, the servo transmission mechanism includes a servo motor, a servo driver, a servo rotation mechanism and a sample gripper which are sequentially connected;

[0021] The sample gripper is used to grip samples. The servo motor drives the servo driver to drive the sample gripper to reciprocate in the pressure-resistant operator, and drives the servo rotation mechanism to drive the sample gripper to rotate in the pressure-resistant operator.

[0022] As an improvement to the technical solution of the natural gas hydrate on-site sample cutting and transferring device of the present invention, the servo transmission mechanism further includes a servo controller, which is connected to the servo driver and the servo rotation mechanism respectively.

[0023] As an improvement to the technical solution of the natural gas hydrate on-site sample cutting and transferring device of the present invention, the pressure-resistant operator can withstand a pressure of 0-40 MPa;

[0024] The pressure-resistant operator is in the shape of a sleeve as a whole, a sheath is provided outside the sample, and the servo transmission mechanism drives the sample and the sheath to realize reciprocating motion and rotation in the pressure-resistant operator.

[0025] As an improvement to the technical solution of the natural gas hydrate on-site sample cutting and transferring device of the present invention, the high-pressure sealing operation unit is detachably connected to the pressure-resistant operator, the cutting unit is detachably connected to the sealing unit, and the sealing unit is detachably connected to the pressure maintaining unit.

[0026] As an improvement to the technical solution of the natural gas hydrate on-site sample cutting and transferring device of the present invention, the sealing unit includes a plurality of ball valves;

[0027] The plurality of ball valves include a first ball valve and a second ball valve. The first ball valve is arranged between the cutting unit and the pressure-resistant operator, and the second ball valve is arranged between the cutting unit and the pressure-maintaining unit.

[0028] As an improvement to the technical solution of the natural gas hydrate on-site sample cutting and transferring device of the present invention, the natural gas hydrate on-site sample cutting and transferring device further comprises a pressurizing system for maintaining and stabilizing the internal pressure of the natural gas hydrate on-site sample cutting and transferring device.

[0029] As an improvement to the technical solution of the natural gas hydrate on-site sample cutting and transfer device of the present invention, the data acquisition system includes a pressure acquisition system and a temperature acquisition system, the pressure acquisition system includes a pressure sensor and a pressure acquisition module, and the temperature acquisition system includes a temperature sensor and a temperature acquisition module;

[0030] The plurality of pressure sensors and the plurality of temperature sensors acquire real-time pressure values ​​and temperature values ​​at different positions in the natural gas hydrate on-site sample cutting and transferring device.

[0031] As an improvement to the technical solution of the natural gas hydrate on-site sample cutting and transferring device of the present invention, the data acquisition system further includes a computer and data processing and analysis software installed in the computer.

[0032] Beneficial effects of the present invention:

[0033] 1. This invention overcomes the key technical difficulties in in-situ processing and analysis of core samples drilled from combustible ice reservoirs, realizes on-site analysis and research of natural gas hydrates, greatly improves the portability of combustible ice analysis equipment, and achieves an upgrade in measurement methods (combustible ice decomposition rate, gas-liquid flow rate, sediment deformation, decomposition gas components and other key technical parameters for combustible ice mining); and achieves direct processing of 30MPa, 1-meter combustible ice core samples;

[0034] 2. In this invention, laboratory testing technology can be extended to field testing, which will directly provide an important theoretical basis and key design parameters for the development of on-site reservoir parameter characterization and online production capacity prediction equipment that must be established for the future industrialization of combustible ice. This will fill the gap in my country's lack of dedicated engineering equipment for on-site testing of combustible ice and provide important theoretical and technical support for the industrialization of combustible ice in my country.

[0035] 3. In the present invention, under the joint action of the servo transmission mechanism, pressure-stabilizing operator, high-pressure sealing operating mechanism and pressure-maintaining unit arranged in sequence, the effect of transferring, cutting and segmented storage of marine combustible ice samples under high-pressure pressure-maintaining conditions is achieved, solving the problem in the prior art that there is no device that can realize the cutting, transfer and segmented storage of combustible ice seabed in-situ pressure-maintaining samples of arbitrary sizes under pressure-maintaining conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG1 is a schematic structural diagram of the present invention.

[0037] Explanation of the accompanying drawings: 1-servo transmission mechanism; 2-pressure-resistant operator; 3-high-pressure sealing operating mechanism; 4-pressure maintaining unit; 5-data acquisition system; 6-clamp; 7-first ball valve; 8-second ball valve; 9-pressurization system; 10-cutting unit; 11-sealing unit; 12-sample; 13-sheath. Specific implementation method:

[0038] In order to make the purpose of the invention, technical solutions and beneficial effects of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] As shown in FIG1 , a natural gas hydrate on-site sample cutting and transferring device includes a servo transmission mechanism 1 , a pressure-resistant operator 2 , a high-pressure sealing operating mechanism 3 , a pressure-maintaining unit 4 , and a data acquisition system 5 ;

[0040] The servo transmission mechanism 1 is connected to the pressure-resistant operator 2, the high-pressure sealing operating mechanism 3 and the pressure-maintaining unit 4 in sequence; wherein the high-pressure sealing operating mechanism 3 includes a cutting unit 10 and a sealing unit 11;

[0041] During operation, the servo transmission mechanism 1 drives the sample 12 to reciprocate or rotate in the pressure-resistant operator 2. When the sample 12 enters the high-pressure sealing operation unit, the cutting unit 10 cuts the sample 12, and the cut sample 12 enters the pressure holding unit 4 for storage.

[0042] Specifically, the present invention is primarily used to achieve the effect of cutting, transferring, and segmented storage of in-situ, pressurized seabed methane hydrate samples 12 under pressure-maintaining conditions to any size. The present invention utilizes the servo drive mechanism 1, pressure-stabilizing operator, high-pressure sealing operator 3, and pressure-maintaining unit 4, which are sequentially arranged, to achieve the effect of transferring, cutting, and segmented storage of marine methane hydrate samples 12 under high-pressure, pressurized conditions.

[0043] This invention can directly study natural gas hydrate deposits, enabling in-situ processing and analysis of cores drilled from combustible ice reservoirs. It can be carried aboard combustible ice exploration vessels or drilling and production vessels, offering exceptional portability. Furthermore, its miniaturized design allows for the rapid and portable cutting and segmented storage of combustible ice under high-pressure, pressure-maintaining conditions.

[0044] More specifically, in the present invention, the servo drive mechanism 1 is used to drive the sample 12 to reciprocate or rotate within the pressure-resistant manipulator 2, including moving the sample 12 within the pressure-resistant manipulator 2 to adjust the length and / or angle of the sample 12. The pressure-resistant manipulator 2 is used to separate the sample 12 under pressure, that is, the pressure-resistant manipulator 2 separates the sample 12 from the sheath 13 while maintaining high pressure.

[0045] The high-pressure sealing mechanism 3 includes a cutting unit 10 and a sealing unit 11. In the present invention, the cutting unit 10 achieves the effect of cutting and segmenting the sample 12, while the sealing unit 11 maintains the overall pressure of the present invention, preventing pressure leakage that affects the quality of the marine methane hydrate sample 12. After being cut under the high-pressure holding state, the sample 12 is transferred to the pressure holding unit 4 under the action of the servo drive mechanism 1 for storage.

[0046] It should be noted here that since the formation of combustible ice requires four basic conditions: low temperature, high pressure environment, and sufficient gas and water sources, in the present invention, it is necessary to ensure the high pressure, pressure maintenance, and sealing state of the natural gas hydrate on-site sample cutting and transfer device of the present invention.

[0047] At the same time, in the present invention, the data acquisition system 5 can also be used to detect and collect data such as pressure and temperature in real time to ensure the high pressure, pressure maintenance and sealing state of the natural gas hydrate on-site sample cutting and transfer device of the present invention, thereby ensuring the storage environment of the combustible ice sample 12.

[0048] In some embodiments of the present invention, the cutting unit 10 is used to realize online isobaric sample 12 cutting, cutting the sample 12 sheath 13 and the sample 12 separately, and the rotational displacement can be read, so that isotopic cutting can be realized without damaging the reservoir sample 12.

[0049] Specifically, the cutting unit 10 is primarily used to segment the sample 12. Since the sample 12 is stored in a PC tube during sampling, the outer PC tube of the sample 12 must be cut first, and then the sample 12 itself is cut. The sample 12 is designed with two sets of cutting tools, controlled by a manual feed mechanism. The blades can be switched between forward and reverse rotations, and the rotational displacement can be read using a counter. As a specific example of this embodiment, the cutting unit 10 has a pressure resistance of 0-40 MPa, an operating temperature of -10°C to 60°C, and a wettability of 316L stainless steel.

[0050] In some embodiments of the present invention, the servo transmission mechanism 1 includes a servo motor, a servo driver, a servo rotation mechanism and a sample 12 gripper that are sequentially connected;

[0051] The sample 12 gripper is used to grip the sample 12 , and the servo motor drives the servo driver to drive the sample 12 gripper to reciprocate in the pressure-resistant manipulator 2 , and drives the servo rotation mechanism to drive the sample 12 gripper to rotate in the pressure-resistant manipulator 2 .

[0052] Preferably, the servo transmission mechanism 1 is also designed with a speed reduction mechanism to achieve self-locking when power is off, and the driver is designed with a pressure balancing mechanism to achieve isobaric operation of the drive shaft.

[0053] Preferably, the servo transmission mechanism 1 is further equipped with a servo controller, which is respectively connected to the servo driver and the servo rotation mechanism. The servo controller can also be connected to a computer through the servo controller to achieve an online control effect. As a specific example of this embodiment, the servo motor is an imported servo motor with a power of 1KW, a rated speed of 3000r / min, a maximum speed of 5000r / min, a rated torque of 2.39Nm, and a maximum torque of 7.16Nm.

[0054] In some embodiments of the present invention, the pressure-resistant operator 2 can withstand a pressure of 0-40 MPa; the pressure-resistant operator 2 is generally sleeve-shaped, a sheath 13 is provided outside the sample 12, and the servo transmission mechanism 1 drives the sample 12 and the sheath 13 to realize reciprocating motion and rotation in the pressure-resistant operator 2.

[0055] In detail, based on the storage environment requirements of combustible ice, it needs to be kept in a high-pressure pressure-maintaining environment, so all components in the present invention should be able to withstand high pressure.

[0056] Among them, in the present invention, the pressure-resistant operator 2 can withstand a pressure of 0-40MPa; the pressure-resistant operator 2 includes a high-pressure holding chamber connected to the servo transmission mechanism 1, and the high-pressure holding chamber is in the shape of a sleeve, which can facilitate the reciprocating movement or rotation of the sample 12 and the sheath 13 in the pressure-resistant operator 2; the end of the high-pressure holding chamber is connected to the core clamp partition, and the end of the high-pressure holding chamber is sealed by the core clamp partition.

[0057] As a specific embodiment of the present invention, the pressure-resistant operator 2 has a pressure resistance of 35 MPa and is made of 316L stainless steel. It controls displacement online with a control accuracy of ±0.5 cm.

[0058] Furthermore, the high-pressure sealing operating mechanism 3 also includes a sealing cavity, in which a spring clamping mechanism is provided. The spring clamping mechanism clamps and fixes the sample 12 transferred from the pressure-resistant operator 2 to facilitate cutting by the cutting unit 10 and ensure cutting accuracy.

[0059] Furthermore, the high-pressure sealing operating mechanism 3 also includes a manual rotation mechanism and a spring clamping mechanism, both of which are designed and installed in the sealing cavity. The overall sealing cavity can ensure a pressure resistance of 30MPa. The manual rotation mechanism is a combination structure of a worm gear mechanism and a screw nut mechanism. The worm and the high-pressure sealing cavity realize high-pressure rotary sealing, which is driven by an external handle. At the same time, a screw is designed on the worm gear, and a screw nut and a spring reset mechanism are designed on the spring clamping mechanism.

[0060] In some embodiments of the present invention, the pressure-maintaining unit 4 is used to track the pressure of the pressure-resistant manipulator 2, the sealed chamber, and the pressure-maintaining storage bin. In a specific embodiment of the present invention, the pressure-maintaining unit 4 utilizes multiple intensifiers to operate in conjunction with a control pressure of 30 MPa and a pressure control accuracy of 5% for sample 12 transfer.

[0061] In some embodiments of the present invention, the high-pressure sealing operation unit is detachably connected to the pressure-resistant operator 2 , the cutting unit 10 is detachably connected to the sealing unit 11 , and the sealing unit 11 is detachably connected to the pressure-maintaining unit 4 .

[0062] In the present invention, the high-pressure sealing operation unit and the pressure-resistant operator 2, the cutting unit 10 and the sealing unit 11, and the sealing unit 11 and the pressure-maintaining unit 4 are all connected by detachable connecting components, wherein the connection can be made by a flange or a clamp 6. In order to facilitate the detachable connection between the components, the preferred connecting component is a clamp 6, which can improve the convenience of connection.

[0063] In some embodiments of the present invention, the sealing unit 11 includes multiple ball valves; the multiple ball valves include a first ball valve 7 and a second ball valve 8, the first ball valve 7 is arranged between the cutting unit 10 and the pressure-resistant operator 2, and the second ball valve 8 is arranged between the cutting unit 10 and the pressure-maintaining unit 4.

[0064] As a specific embodiment of the present invention, in the present invention, the pressure-resistant operator 2 is connected to the cutting unit 10 clamp 6 in the high-pressure sealing operating mechanism 3, the cutting unit 10 is connected to the first ball valve 7 clamp 6, a second ball valve 8 is arranged between the cutting unit 10 and the pressure holding unit 4, and the first ball valve 7 and the second ball valve 8 are connected by a clamp 6.

[0065] In some embodiments of the present invention, the natural gas hydrate on-site sample cutting and transferring device further comprises a pressurizing system 9 for maintaining and stabilizing the internal pressure of the natural gas hydrate on-site sample cutting and transferring device.

[0066] In some embodiments of the present invention, the data acquisition system 5 includes a pressure acquisition system and a temperature acquisition system. The pressure acquisition system includes a pressure sensor and a pressure acquisition module, and the temperature acquisition system includes a temperature sensor and a temperature acquisition module.

[0067] Multiple pressure sensors and multiple temperature sensors acquire real-time pressure and temperature values ​​at different locations within the natural gas hydrate sample cutting and transfer device. Furthermore, the data acquisition system 5 also includes a computer and data processing and analysis software installed in the computer.

[0068] Specifically, the data acquisition system 5 includes a pressure acquisition system and a temperature acquisition system. The pressure acquisition system includes a pressure sensor and a pressure acquisition module, while the temperature acquisition system includes a temperature sensor and a temperature acquisition module. The temperature sensor is used to measure the temperature at various points in the present invention and transmits the measured temperature information to the temperature acquisition module. The pressure sensor is used to measure the pressure at various points in the present invention and transmits the measured pressure information to the pressure acquisition module. The temperature acquisition module then feeds the temperature information back to the computer's analytical data processing software for analysis and processing.

[0069] As a specific embodiment of the present invention, the temperature sensor module adopts a high-precision temperature sensor with a temperature measurement range of -50°C to 60°C and an accuracy of 0.5%; the pressure sensor adopts a senex brand high-precision differential pressure sensor with a measuring range of 30MPa and an accuracy of 0.1% FS, and the quantity is 7 sets; the acquisition module is mainly used to collect pressure sensor data in the system process, and the collected data is fed back to the software through the acquisition module.

[0070] Furthermore, the data acquisition system 5 also includes a computer and data processing and analysis software installed in the computer.

[0071] In some embodiments of the present invention, the data acquisition system 5 is similar to conventional technology and includes a computer and data processing and analysis software installed on the computer. The data acquisition and processing system primarily consists of acquisition hardware and software. The acquisition hardware primarily consists of a data acquisition card, a PLC controller, and a computer; the acquisition software is based on Windows 7 system simulation software, system analysis and testing software. This system enables comprehensive pressure and flow monitoring, precise control, and interface control, including real-time data analysis, various seepage processing reports, and curves.

[0072] As a specific embodiment of the present invention, the present invention's on-site natural gas hydrate sample cutting and transfer device includes a servo drive mechanism 1, a pressure-stabilizing operator, a high-pressure sealing operator 3, and a pressure-maintaining unit 4, which are arranged in sequence. The high-pressure sealing operator 3 includes a cutting unit 10 and a sealing unit 11. Under the combined action of the servo drive mechanism 1, the pressure-stabilizing operator, the high-pressure sealing operator 3, and the pressure-maintaining unit 4, the present invention achieves the effect of transferring, cutting, and segmented storage of marine combustible ice samples 12 under high-pressure maintenance conditions.

[0073] During operation, the servo transmission mechanism 1 is used to drive the pressure-resistant manipulator to move back and forth, which is used to realize 360° rotation of the sample 12 after clamping the sample 12. The pressure-resistant manipulator is used to drive the gripper to grasp the sample 12, and cooperate with the high-pressure sealing operating mechanism 3 to assist the sample 12 cutting unit 10 to cut the sample 12, and realize reciprocating motion under the action of the servo transmission mechanism 1; the cut sample 12 is placed in the high-pressure pressure holding chamber in the pressure holding unit 4 for storage; during the entire cutting process, the system pressure is collected through the pressure collection system, and the data is transmitted to the data acquisition and control system for data processing and analysis.

[0074] Since the high-pressure sealing operation unit is detachably connected to the pressure-resistant operator 2, the cutting unit 10 is detachably connected to the sealing unit 11, and the sealing unit 11 is detachably connected to the pressure-maintaining unit 4, the first ball valve 7 and the second ball valve 8 can be opened or closed to realize the on-site assembly of the present invention and facilitate the transfer of the sample 12 under the high-pressure pressure-maintaining state.

[0075] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A natural gas hydrate on-site sample cutting and transfer device, characterized in that: It includes a servo transmission mechanism, a pressure-resistant operator, a high-pressure sealing operating mechanism, a pressure-maintaining unit and a data acquisition system; The servo transmission mechanism is connected to the pressure-resistant operator, the high-pressure sealing operating mechanism and the pressure-maintaining unit in sequence; wherein the high-pressure sealing operating mechanism includes a cutting unit and a sealing unit; During operation, the servo transmission mechanism drives the sample to reciprocate or rotate in the pressure-resistant operator. After the sample enters the high-pressure sealing operation unit, the sample is cut by the cutting unit, and the cut sample enters the pressure-maintaining unit for storage.

2. The natural gas hydrate on-site sample cutting and transferring device according to claim 1, characterized in that: The servo transmission mechanism comprises a servo motor, a servo driver, a servo rotating mechanism and a sample gripper which are sequentially connected; The sample gripper is used to grip samples. The servo motor drives the servo driver to drive the sample gripper to reciprocate in the pressure-resistant operator, and drives the servo rotating mechanism to drive the sample gripper to rotate in the pressure-resistant operator.

3. The natural gas hydrate on-site sample cutting and transfer device according to claim 2, characterized in that: The servo transmission mechanism also includes a servo controller, which is connected to the servo driver and the servo rotating mechanism respectively.

4. The natural gas hydrate on-site sample cutting and transferring device according to claim 1, characterized in that: The pressure-resistant operator can withstand a pressure of 0-40MPa; The pressure-resistant operator is in the shape of a sleeve as a whole, a sheath is arranged outside the sample, and the servo transmission mechanism drives the sample and the sheath to realize reciprocating motion and rotation in the pressure-resistant operator.

5. The natural gas hydrate on-site sample cutting and transferring device according to claim 1, characterized in that: The high-pressure sealing operation unit is detachably connected to the pressure-resistant operator, the cutting unit is detachably connected to the sealing unit, and the sealing unit is detachably connected to the pressure-maintaining unit.

6. The natural gas hydrate on-site sample cutting and transferring device according to claim 5, characterized in that: The sealing unit includes a plurality of ball valves; The plurality of ball valves include a first ball valve and a second ball valve. The first ball valve is disposed between the cutting unit and the pressure-resistant operator, and the second ball valve is disposed between the cutting unit and the pressure-maintaining unit.

7. The natural gas hydrate on-site sample cutting and transferring device according to claim 1, characterized in that: The natural gas hydrate on-site sample cutting and transferring device further comprises a pressurizing system for maintaining and stabilizing the internal pressure of the natural gas hydrate on-site sample cutting and transferring device.

8. The natural gas hydrate on-site sample cutting and transferring device according to claim 1, characterized in that: The data acquisition system includes a pressure acquisition system and a temperature acquisition system. The pressure acquisition system includes a pressure sensor and a pressure acquisition module. The temperature acquisition system includes a temperature sensor and a temperature acquisition module. The plurality of pressure sensors and the plurality of temperature sensors acquire real-time pressure values ​​and temperature values ​​at different positions in the natural gas hydrate on-site sample cutting and transferring device.

9. The natural gas hydrate on-site sample cutting and transferring device according to claim 8, characterized in that: The data acquisition system also includes a computer and data processing and analysis software installed in the computer.

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