Field basic parameter characterization and test device for natural gas hydrate

Abstract

The present invention relates to the technical field of natural gas hydrate exploitation, and in particular to a field basic parameter characterization and test device for a natural gas hydrate. The device comprises a non-disturbed permeability test module, a pressurization system, a servo transmission mechanism, a data collection system, a resistivity test system and an outlet metering system, wherein the non-disturbed permeability test module is used for performing a permeability test on a hydrate sample after sample transfer; the pressurization system is used for adjusting the pressure of each point in the field basic parameter characterization and test device for a natural gas hydrate; the servo transmission mechanism comprises a pressure-resistant sample transfer operator and a servo driver, the servo driver being used for driving the pressure-resistant sample transfer operator to reciprocate, and the pressure-resistant sample transfer operator being used for separating a test sample from a sheath under pressure, and pushing the sample into a clamp holder; and the resistivity test system is used for measuring a resistivity value.

Description

A natural gas hydrate field basic parameter characterization test device Technical field:

[0001] The present invention relates to the technical field of natural gas hydrate exploitation, in particular to a natural gas hydrate on-site basic parameter characterization and testing 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:

[0014] 1. Sample transfer operation under pressure maintenance conditions enables rapid testing of combustible ice samples collected directly after treatment and pressure maintenance on site;

[0015] 2. The pressure-resistant sample transfer operator realizes the integration of sample transfer and testing under pressure-maintaining conditions;

[0016] 3. The miniaturized design ensures the speed and portability of combustible ice analysis under pressure maintenance conditions.

[0017] Summary of the invention:

[0018] The purpose of the present invention is to solve the problems existing in the prior art and provide a natural gas hydrate field basic parameter characterization test device.

[0019] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0020] A natural gas hydrate field basic parameter characterization test device includes a servo drive mechanism, a pressure-resistant operator, a sealing mechanism, a data acquisition system, a resistivity test system, an outlet metering system, and a non-disturbance permeability test module; the sealing mechanism includes at least a plurality of valve bodies;

[0021] The servo transmission mechanism is sequentially connected to the pressure-resistant operator, the resistivity test system, and the outlet metering system, and the resistivity test system is a multi-channel resistivity test system, and the resistivity test system is respectively connected to the pressurization system and the non-disturbance permeability test module;

[0022] During operation, the servo transmission mechanism is used to enable the sample to perform reciprocating motion or rotation in the pressure-resistant manipulator, and the pressure and temperature acquisition system and the resistivity testing system are used to monitor the data changes of pressure, temperature and resistivity of the natural gas hydrate field basic parameter characterization testing device in real time. The non-disturbance permeability testing module is used to detect the permeability of the hydrate sample in real time to obtain the parameter data of the marine combustible ice sample site.

[0023] As an improvement to the technical solution of the natural gas hydrate field basic parameter characterization test 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;

[0024] 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.

[0025] As an improvement to the technical solution of the natural gas hydrate field basic parameter characterization test device of the present invention, the pressure-resistant operator can withstand a pressure of 0-40 MPa;

[0026] 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.

[0027] As an improvement to the technical solution of the natural gas hydrate field basic parameter characterization test device of the present invention, the sealing mechanism includes at least two valve bodies;

[0028] At least two of the valve bodies include a ball valve and a back pressure control valve;

[0029] The ball valve is arranged between the pressure-resistant operator and the resistivity test system, and the back pressure control valve is arranged between the resistivity test system and the outlet metering system;

[0030] The pressure between the resistivity testing system and the non-disturbance permeability testing module is ensured by a ball valve and the back pressure control valve.

[0031] As an improvement to the technical solution of the natural gas hydrate field basic parameter characterization test device of the present invention, the non-disturbance permeability test module includes a test mechanism and a non-disturbance permeability test injection pump connected to the test mechanism.

[0032] As an improvement to the technical solution of the natural gas hydrate field basic parameter characterization test device of the present invention, the resistivity test system is connected to a pressurizing system, which maintains and stabilizes the pressure in the natural gas hydrate field basic parameter characterization test device.

[0033] As an improvement to the technical solution of the natural gas hydrate field basic parameter characterization test device of the present invention, the pressure-resistant operator and the resistivity test system are detachably connected via a clamp, and the valve body is provided between the clamp and the resistivity test system.

[0034] As an improvement to the technical solution of the natural gas hydrate field basic parameter characterization test 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;

[0035] The plurality of pressure sensors and the plurality of temperature sensors obtain real-time pressure values ​​and temperature values ​​at different positions in the natural gas hydrate field basic parameter characterization test device.

[0036] As an improvement to the technical solution of the natural gas hydrate field basic parameter characterization test device of the present invention, the data acquisition system further includes a computer and data processing and analysis software installed in the computer.

[0037] As an improvement to the technical solution of the natural gas hydrate field basic parameter characterization test device of the present invention, the outlet metering system is a high-precision electronic balance.

[0038] Beneficial effects of the present invention:

[0039] 1. The present invention can process combustible ice core samples, and the combustible ice core samples can be 30MPa and 1-meter combustible ice core samples, to achieve on-site rapid measurement of the whole core, such as the resistivity, permeability, porosity, and hydrate saturation of the combustible ice core; to realize on-site decomposition experiments of combustible ice cores, to directly and quickly obtain the key technical parameters of combustible ice mining, such as the combustible ice decomposition rate, gas-liquid flow rate, sediment deformation, and decomposition gas components; with the supporting combustible ice production capacity evaluation numerical simulation software, the above combustible ice core key parameters can be directly used in the simulation software to evaluate the combustible ice production capacity in the target mining area, and provide technical support for selecting the mining target area and technical optimization solutions for the mining method.

[0040] 2. By using 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 special engineering equipment for on-site testing of combustible ice, and provide important theoretical and technical support for the industrialization process of combustible ice in my country.

[0041] 3. The present invention breaks through the key technical difficulties in on-site processing and analysis of core samples drilled from combustible ice reservoirs, realizes on-site scale analysis and research of natural gas hydrates, greatly improves the portability of combustible ice analysis equipment, and realizes online permeability testing and multi-channel temperature, pressure, and resistivity testing. Description of the drawings:

[0042] FIG1 is a schematic structural diagram of the present invention.

[0043] Explanation of the accompanying symbols: 1-servo transmission mechanism; 2-pressure-resistant operator; 3-sealing test section; 4-data acquisition system; 5-resistivity test system; 6-outlet metering system; 7-non-disturbance permeability test module; 8-clamp; 9-ball valve; 10-back pressure control valve; 11-pressurization system; 12-sample; 13-sheath; 14-non-disturbance permeability test injection pump. Specific implementation method:

[0044] 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.

[0045] As shown in FIG1 , a natural gas hydrate field basic parameter characterization test device includes a servo drive mechanism 1, a pressure-resistant operator 2, a sealing mechanism, a data acquisition system 4, a resistivity test system 5, an outlet metering system 6, and a non-perturbation permeability test module 7; the sealing mechanism includes at least a plurality of valve bodies;

[0046] The servo drive mechanism 1 is sequentially connected to the pressure-resistant operator 2, the resistivity test system 5, and the outlet metering system 6. The resistivity test system 5 is a multi-channel resistivity test system 5. The resistivity test system 5 is respectively connected to the pressurization system 11 and the non-disturbance permeability test module 7.

[0047] During operation, the servo transmission mechanism 1 is used to enable the sample 12 to perform reciprocating motion or rotation in the pressure-resistant operator 2, and the pressure and temperature acquisition system and the resistivity testing system 5 are used to monitor the pressure, temperature and resistivity data changes of the natural gas hydrate field basic parameter characterization test device in real time. The non-disturbance permeability testing module 7 is used to detect the permeability of the hydrate sample 12 in real time to obtain the on-site parameter data of the marine combustible ice sample 12.

[0048] Specifically, the present invention is primarily used for online permeability testing and multi-channel temperature, pressure, and resistivity testing of cut samples 12. The present invention can process combustible ice core samples 12, enabling rapid on-site measurements of the entire core, including resistivity, permeability, porosity, and hydrate saturation. It also enables on-site decomposition experiments of combustible ice cores, directly and rapidly obtaining key technical parameters for combustible ice mining, such as the decomposition rate, gas-liquid flow rate, sediment deformation, and decomposed gas composition. Furthermore, the present invention is equipped with numerical simulation software for combustible ice production capacity evaluation, allowing these key combustible ice core parameters to be directly used in the simulation software to evaluate the combustible ice production capacity of target mining areas. The system also provides technical support for selecting mining targets and technical optimization solutions for mining methods.

[0049] The present invention can directly study natural gas hydrate deposits and realize on-site in-situ processing and analysis of cores drilled from combustible ice reservoirs; it can be carried on combustible ice exploration ships or drilling and production ships, has extremely high portability, and can also realize online permeability testing and multi-channel temperature, pressure, and resistivity testing.

[0050] In the present invention, the sample transfer operation under high-pressure maintaining conditions can be realized, and the combustible ice sample 12 collected under pressure after treatment can be quickly tested directly on site, and the pressure value, temperature value, resistance value and permeability can be detected in real time. That is, the present invention realizes the integration of sample transfer and testing under pressure maintaining conditions; at the same time, the miniaturized design of the present invention meets the convenience and portability of combustible ice analysis and testing under high-pressure maintaining conditions.

[0051] In detail, in the present invention, the servo transmission mechanism 1 is used to drive the sample 12 to reciprocate or rotate in the pressure-resistant operator 2 so as to adjust the length and / or angle of the sample 12 in the present invention. The pressure-resistant operator 2 is used to separate the sample 12 under pressure, that is, the pressure-resistant operator 2 is used to achieve the separation effect of the sample 12 and the sheath 13 under high pressure maintenance. The sealing mechanism is used to maintain the overall pressure of the present invention to avoid pressure leakage, and changes in pressure values ​​affect the preservation of the sample 12 and the parameter test results. The data acquisition system 4 is used for real-time detection and collection so that the experimenter can obtain real-time pressure and temperature values; the resistivity testing system 5 is used to detect the resistivity value of the sample 12 clamp in the servo transmission mechanism 1, and to infer and detect the saturation distribution of different areas based on the relationship between resistivity and saturation.

[0052] When the present invention is in use, the sample 12 clamped by the sample 12 clamper in the servo transmission mechanism 1 can clamp the sample 12 provided with the sheath 13, and can drive the sample 12 to reciprocate or rotate in the pressure-resistant operator 2. The servo transmission mechanism 1 can be used to adjust the length and / or angle of the sample 12 in the pressure-resistant operator 2, and under the joint action of the servo transmission mechanism 1, the pressure-resistant operator 2 and the sealing mechanism, the effect of separating the sample 12 from the sheath 13 is achieved under high-pressure maintaining conditions.

[0053] After the sample 12 and the jacket 13 separate, the sample 12 enters the test section. In the test section, a resistivity testing system 5 and a data acquisition system 4 are provided. The resistivity testing system 5 and the data acquisition system 4 respectively acquire the pressure, temperature, and resistivity data of the present invention. The non-perturbation permeability testing module 7 can also be used to perform real-time permeability testing on the hydrate sample 12 to obtain on-site parameter data of the marine combustible ice sample 12.

[0054] 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 field basic parameter characterization test device of the present invention.

[0055] 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;

[0056] 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 .

[0057] 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.

[0058] Preferably, the servo transmission mechanism 1 is further equipped with a servo controller, which is 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] As a specific embodiment of the present invention, the pressure-resistant sample transfer manipulator 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.

[0063] In some embodiments of the present invention, the sealing mechanism includes at least two valve bodies;

[0064] At least two valve bodies include a ball valve 9 and a back pressure control valve 10;

[0065] The ball valve 9 is provided between the pressure-resistant operator 2 and the resistivity test system 5 , and the back pressure control valve 10 is provided between the resistivity test system 5 and the outlet metering system 6 ;

[0066] The pressure between the resistivity test system 5 and the non-disturbance permeability test module 7 is ensured by the ball valve 9 and the back pressure control valve 10 to achieve pressure adjustment and ensure the sealing of the natural gas hydrate field basic parameter characterization test device.

[0067] In some embodiments of the present invention, the resistivity testing system 5 includes a resistivity measuring instrument.

[0068] As a specific embodiment of the present invention, there are 10 resistivity measurement points with a range of 0 to 105 Ω·cm and an accuracy of 0.1%. Since the resistivity meter primarily detects the resistivity value of the holder through saturation electrical measurement points, the relationship between resistivity and saturation is used to infer and detect the saturation distribution in different areas. Three electrodes are evenly spaced within the model. Resistance is an indicator of good methane hydrate formation and decomposition. The system resistance increases rapidly when hydrates form and decreases sharply when hydrates decompose. In this system, the resistivity measurement range is 0 to 15,000 Ω·m with an accuracy of 1%.

[0069] Furthermore, the non-disturbance permeability test module 7 includes a testing mechanism and a non-disturbance permeability test injection pump 14 connected to the testing mechanism. The non-disturbance permeability test injection pump 14 is used for in-situ permeability testing of the combustible ice sample 12, and the closed driving structure ensures that the combustible ice sample 12 does not decompose during the permeability test.

[0070] Furthermore, the non-perturbative permeability test module 7 utilizes a triaxial, non-perturbative permeability test module 7 and employs a rubber sheath for circumferential pressure loading, creating a pressure buffer within the rubber sheath to ensure safety during use. A large-diameter, high-pressure isolator is designed at the top of the testing mechanism to maintain pressure during sample transfer. The non-perturbative permeability test injection pump 14 is used for in-situ permeability testing of the combustible ice sample 12, featuring a sealed drive structure to ensure that the combustible ice sample 12 does not decompose during the permeability test.

[0071] As a specific embodiment of the present invention, the non-perturbative permeability test module 7 is paired with a non-perturbative permeability test injection pump 14, which together apply circumferential and axial pressure to the holder sample 12, with a loading pressure of 35 MPa. This allows for online measurement of temperature, pressure, and resistivity after sample transfer. The transferred sample 12 has specifications of φ50 × 200 mm, 316L. The maximum axial and confining pressures are 35 MPa, with a pressure control accuracy of ±0.1 MPa. Furthermore, the non-perturbative permeability test injection pump 14 is used for in-situ permeability testing of the combustible ice sample 12, featuring a sealed drive structure to ensure that the combustible ice sample 12 does not decompose during the permeability test.

[0072] In some embodiments of the present invention, the resistivity test system 5 is connected to a pressurizing system 11, which maintains and stabilizes the pressure in the natural gas hydrate field basic parameter characterization test device through the pressurizing system 11. Preferably, the pressurizing system 11 includes an annular pressure axial pressure loading pump.

[0073] In some embodiments of the present invention, the pressure-resistant operator 2 and the resistivity testing system 5 are detachably connected via a clamp 8. A valve body is provided between the clamp 8 and the resistivity testing system 5. As needed, after the sample 12 is transferred from the pressure-resistant operator 2 to the test section, the test section 3 is sealed by a sealing mechanism, and then the pressure-resistant operator 2 is separated from the test section by the clamp 8 to facilitate operation by the operator.

[0074] In some embodiments of the present invention, the data acquisition system 4 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.

[0075] Multiple pressure sensors and multiple temperature sensors obtain real-time pressure values ​​and temperature values ​​at different locations in the natural gas hydrate field basic parameter characterization test device.

[0076] In some embodiments of the present invention, data acquisition system 4 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. The temperature sensor is used to measure the temperature at various points in the present invention and transmit 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 transmit 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.

[0077] 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.

[0078] Furthermore, the data acquisition system 4 also includes a computer and data processing and analysis software installed in the computer.

[0079] In some embodiments of the present invention, the data acquisition system 4, as in conventional technology, 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 comprises a data acquisition card, a PLC controller, and a computer; the acquisition software is based on Windows 7 system simulation software and system analysis and testing software. This system enables comprehensive pressure and flow monitoring and analysis, precise control of the non-perturbation permeability test injection pump 14, and interface control. It also includes real-time data analysis, including various seepage processing reports and curves.

[0080] In some embodiments of the present invention, the outlet metering system 6 is a high-precision electronic balance.

[0081] As a specific embodiment of the present invention, the apparatus for testing and characterizing the basic parameters of natural gas hydrates in situ includes, arranged from left to right, a servo drive mechanism 1, a pressure-resistant operator 2, a clamp 8, a ball valve 9, a resistivity test system 5, a backpressure control valve 10, and an outlet metering system 6. The resistivity test system 5 is further connected to a non-perturbative permeability test module 7 and a pressurization system 11.

[0082] In some embodiments of the present invention, the outlet metering system 6 is a high-precision electronic balance. As a specific embodiment of the present invention, the high-precision electronic balance has a maximum range of 6200g, an accuracy of 0.1g, and is available in one unit.

[0083] When in use, the sample 12 with the sheath 13 can be clamped by the sample clamper in the servo transmission mechanism 1 and reciprocated or rotated in the pressure-resistant manipulator 2 to adjust the length and / or angle of the sample 12; during the reciprocating motion, the sample 12 can be sent to the test section. At the same time, the sample 12 and the sheath 13 are separated under pressure in the pressure-resistant manipulator 2, and the separated sample 12 is sent to the test section.

[0084] When the sample 12 is placed in the test section, the ball valve 9 is closed, and then a sealed test section 3 is formed through the ball valve 9 and the back pressure control valve 10. In this way, the servo transmission mechanism 1 and the pressure-resistant operator 2 can be separated from the test section through the clamp 8 to allow the position of the sealed test section 3 to be transferred.

[0085] In addition, in the sealing test section 3, the resistivity value can be obtained by the resistivity testing system 5, and the saturation distribution of different areas can be calculated and detected based on the relationship between the resistivity and the saturation. At the same time, the permeability test of the sample 12 can also be performed by the non-perturbation permeability testing module 7. Among them, the non-perturbation permeability testing module 7 includes a testing mechanism and a non-perturbation permeability testing injection pump 14 connected to the testing mechanism. A large-diameter high-pressure isolator is provided in the testing mechanism. The large-diameter high-pressure isolator and the non-perturbation permeability testing injection pump 14 can be used to maintain pressure, that is, to achieve high-pressure maintenance conditions, and perform permeability testing on the sample 12.

[0086] 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 field basic parameter characterization test device, characterized in that: It includes a servo transmission mechanism, a pressure-resistant operator, a sealing mechanism, a data acquisition system, a resistivity test system, an outlet metering system and a non-disturbance permeability test module; the sealing mechanism includes at least a plurality of valve bodies; The servo transmission mechanism is connected to the pressure-resistant operator, the resistivity test system, and the outlet metering system in sequence, and the resistivity test system is a multi-channel resistivity test system, and the resistivity test system is respectively connected to a pressurization system and the non-disturbance permeability test module; During operation, the servo transmission mechanism is used to enable the sample to perform reciprocating motion or rotation in the pressure-resistant operator, the pressure and temperature acquisition system and the resistivity testing system are used to monitor the data changes of pressure, temperature and resistivity of the natural gas hydrate field basic parameter characterization testing device in real time, and the non-disturbance permeability testing module is used to detect the permeability of the hydrate sample in real time to obtain the parameter data of the marine combustible ice sample site.

2. The natural gas hydrate field basic parameter characterization test device according to claim 1, characterized in that: The servo transmission mechanism includes a servo motor, a servo driver, a servo rotating mechanism and a sample clamp which are sequentially connected; the sample clamp is used to clamp the sample, and the servo motor drives the servo driver to drive the sample clamp to reciprocate in the pressure-resistant operator, and drives the servo rotating mechanism to drive the sample clamp to rotate in the pressure-resistant operator.

3. The natural gas hydrate field basic parameter characterization test 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.

4. The natural gas hydrate field basic parameter characterization test device according to claim 1, characterized in that: The sealing mechanism includes at least two valve bodies; At least two of the valve bodies include a ball valve and a back pressure control valve; The ball valve is arranged between the pressure-resistant operator and the resistivity test system, and the back pressure control valve is arranged between the resistivity test system and the outlet metering system; The pressure between the resistivity testing system and the non-disturbance permeability testing module is ensured by a ball valve and the back pressure control valve.

5. The natural gas hydrate field basic parameter characterization test device according to claim 4, characterized in that: The non-disturbance permeability test module comprises a test mechanism and a non-disturbance permeability test injection pump connected to the test mechanism.

6. The natural gas hydrate field basic parameter characterization test device according to claim 1, characterized in that: The resistivity test system is connected to a pressurizing system, and the pressure in the natural gas hydrate field basic parameter characterization test device is maintained and stabilized by the pressurizing system.

7. The natural gas hydrate field basic parameter characterization test device according to claim 1, characterized in that: The pressure-resistant operator is detachably connected to the resistivity testing system via a clamp, and the valve body is arranged between the clamp and the resistivity testing system.

8. The natural gas hydrate field basic parameter characterization test 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 field basic parameter characterization test device.

9. The natural gas hydrate field basic parameter characterization test 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.

10. The natural gas hydrate field basic parameter characterization test device according to claim 1, characterized in that: The outlet metering system is a high-precision electronic balance.

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