High-temperature and high-pressure nuclear magnetic displacement device of movable bearing platform and method of high-temperature and high-pressure nuclear magnetic displacement device

Abstract

The invention discloses a high-temperature and high-pressure nuclear magnetic displacement device of a movable bearing platform and a method thereof, and relates to the technical field of material detection, the high-temperature and high-pressure nuclear magnetic displacement device comprises a gas-liquid displacement pipeline used for carrying out a liquid or gas displacement experiment; the CO2 gas displacement pipeline takes CO2 as a displacement medium; the methane gas pipeline takes methane gas as an adsorption medium; the conventional gas pipeline is used for carrying out a nitrogen displacement experiment by taking nitrogen as a displacement medium; a gas pressurization pipeline; the liquid discharge valve is used for liquid discharge treatment of the gas-liquid displacement pipeline and the CO2 gas displacement pipeline; a nuclear magnetic pipeline; and the flow monitoring pipeline is used for monitoring flow or volume change. The arrangement mode that the gas pressurization pipeline and the flow monitoring pipeline are matched is utilized, through the synergistic effect of the overburden pressure nuclear magnetic signal cavity, the preheater and the confining pressure controller, the high-temperature and high-pressure conditions of the deep oil and gas reservoir can be accurately simulated, and reliable experimental data support is provided for optimizing the oil and gas exploitation technology and improving the recovery efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of material detection, and particularly relates to a high-temperature and high-pressure nuclear magnetic displacement device with a movable bearing platform and a method thereof. Background Art

[0002] In the development of deep oil and gas fields, cores are usually in a high-temperature and high-pressure environment. Studying their pore structures and fluid migration laws helps optimize production processes and improve recovery rates. Secondly, in coalbed methane production, the adsorption and desorption behaviors of coal rocks directly affect production efficiency, and high-temperature and high-pressure conditions will significantly change the adsorption characteristics of methane gas. Therefore, it is necessary to deeply study its migration laws. Thirdly, the CO2 displacement technology is not only an important means to improve oil and gas recovery rates but also a key way to achieve carbon sequestration. However, the interaction mechanism between CO2 and cores or coal rocks under high-temperature and high-pressure conditions is not yet clear, and it is urgent to reveal its dynamic behavior through experimental research. Finally, with the growth of energy demand and the improvement of environmental protection requirements, the efficient development of oil and gas resources and the realization of CO2 geological sequestration have become the focus of global attention, and related research depends on a deep understanding of fluid migration laws under high-temperature and high-pressure conditions.

[0003] However, the existing technologies have significant deficiencies in this field: in oil and gas field development, there is a lack of devices that can accurately simulate the high-temperature and high-pressure environment of deep oil and gas reservoirs, resulting in experimental data that cannot truly reflect actual production conditions and are difficult to guide the optimization of production processes; in coalbed methane production, traditional experimental devices cannot simulate the adsorption and desorption behaviors under high-temperature and high-pressure conditions, resulting in a large deviation between experimental results and actual production efficiency; in CO2 displacement and sequestration, existing devices are difficult to simulate the complex interaction between CO2 and cores or coal rocks and cannot monitor the fluid dynamic changes during the CO2 displacement process in real time, limiting the further optimization of the technology. Therefore, there is an urgent need for an efficient and accurate high-temperature and high-pressure nuclear magnetic displacement device and a method thereof to solve the above problems and provide reliable technical support for research in related fields. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-temperature and high-pressure nuclear magnetic displacement device with a movable bearing platform and a method thereof to solve the problems mentioned in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A high-temperature and high-pressure nuclear magnetic displacement device with a movable bearing platform, comprising:

[0006] A gas-liquid displacement pipeline for conducting liquid or gas displacement experiments;

[0007] A CO2 gas displacement pipeline for conducting CO2 gas displacement experiments with CO2 as the displacement medium;

[0008] The methane gas pipeline uses methane gas as the adsorption medium to conduct methane gas displacement experiments;

[0009] The conventional gas pipeline uses nitrogen as the displacement medium to conduct nitrogen displacement experiments;

[0010] The gas booster pipeline is used for the input and pressurization of gases in the CO2 gas displacement pipeline, methane gas pipeline, and conventional gas pipeline;

[0011] The drain valve is used for draining liquid in the gas-liquid displacement pipeline and CO2 gas displacement pipeline;

[0012] The NMR pipeline is connected to the gas-liquid displacement pipeline, CO2 gas displacement pipeline, methane gas pipeline, and conventional gas pipeline through pipelines, and the real-time dynamic changes of fluids during the process are monitored by nuclear magnetic resonance technology;

[0013] The flow monitoring pipeline is used to monitor flow or volume changes.

[0014] Preferably, the gas-liquid displacement pipeline includes a stable displacement pump, a storage system, and a total gas-liquid outlet valve. Multiple groups of the storage systems are arranged in parallel pipelines, and multiple groups of the storage systems are connected to the stable displacement pump and the total gas-liquid outlet valve in series pipelines. The storage system includes a displacement storage tank, a container displacement power liquid switch valve, and a container gas-liquid receiving valve. The container displacement power liquid switch valve and the container gas-liquid receiving valve are respectively connected to both ends of the displacement storage tank.

[0015] Preferably, the CO2 gas displacement pipeline includes a CO2 gas receiving valve, a CO2 intermediate container, an intermediate container displacement power switch valve, a gas displacement receiving valve, a CO2 gas heating container, and a CO2 displacement outlet valve. One end of the CO2 gas receiving valve is connected to the gas booster pipeline, the other end of the CO2 gas receiving valve is connected between the CO2 gas heating container and the CO2 intermediate container, and the gas displacement receiving valve is connected between the CO2 intermediate container and the CO2 gas heating container. The intermediate container displacement power switch valve is connected between the CO2 intermediate container and the drain valve, and the CO2 displacement outlet valve is connected between the CO2 gas heating container and the NMR pipeline.

[0016] Preferably, the methane gas pipeline includes a methane gas pipeline valve, a vacuum pump, a methane gas receiving valve, a reference tank, and a methane gas output valve. The methane gas pipeline valve is used as a node to connect to the conventional gas pipeline and the gas booster pipeline. The vacuum pump is arranged between the methane gas pipeline valve and the reference tank. The methane gas receiving valve and the methane gas output valve are respectively connected to the inlet and outlet of the reference tank, and a tank pressure sensor is provided on the reference tank.

[0017] Preferably, the conventional gas pipeline includes a switching needle valve, and the switching needle valve is connected between the methane gas pipeline valve and the nuclear magnetic pipeline.

[0018] Preferably, the gas pressurization pipeline includes a gas storage system, a main gas source inlet switch, a booster pump, a pressurized storage tank, and a gas pressure reducing valve. Multiple groups of the gas storage systems are arranged in parallel pipelines. The main gas source inlet switch is connected between the gas storage system and the booster pump. The outlet of the booster pump is connected to the inlet of the pressurized storage tank. The gas pressure reducing valve is connected to the outlet end of the pressurized storage tank. And the pipeline between the pressurized storage tank and the gas pressure reducing valve is connected to the CO2 gas receiving valve. The gas storage system includes a gas cylinder, a cylinder valve, and a cylinder pressure reducing valve. The gas cylinder, the cylinder valve, and the cylinder pressure reducing valve are arranged in series pipelines.

[0019] Preferably, an exhaust gas relief valve is connected to the outlet end of the methane gas pipeline valve.

[0020] Preferably, the nuclear magnetic pipeline includes a nuclear magnetic mounting platform, a gripper, a gripper temperature sensor, an confining pressure loading interface, a temperature loading interface, a heating liquid storage tank, a preheater, a preheater temperature sensor, a confining pressure liquid storage tank, a confining pressure controller, a confining pressure valve, and an inlet pressure sensor. An overburden nuclear magnetic signal cavity is arranged inside the nuclear magnetic mounting platform. The gripper is arranged inside the nuclear magnetic signal cavity. The gripper temperature sensor is installed on the gripper. The confining pressure loading interface is connected to both ends of the nuclear magnetic mounting platform. The temperature loading interface is connected to the gripper. Both ends of the heating liquid storage tank are connected to the preheater. The preheater temperature sensor is arranged on the preheater. And both ends of the preheater are installed on the temperature loading interface. Both ends of the confining pressure controller are respectively connected to the two confining pressure loading interfaces. The confining pressure valve is arranged on the confining pressure controller. Both ends of the confining pressure liquid storage tank are connected to the confining pressure controller. The confining pressure valve is arranged on the confining pressure controller. The inlet pressure sensor is connected to one of the confining pressure loading interfaces. The other confining pressure loading interface is connected to the flow rate monitoring pipeline.

[0021] Preferably, the flow rate monitoring pipeline includes an outlet pressure sensor, a back pressure valve, a manual pump, a flow meter control valve, a flow meter, a weight scale control valve, and a weight scale. The outlet pressure sensor is connected between the confining pressure loading interface and the back pressure valve. The manual pump, the flow meter, and the weight scale are all installed at the outlet end of the back pressure valve. The flow meter control valve is installed at the inlet end of the flow meter. The weight scale control valve is installed at the inlet end of the weight scale.

[0022] The present invention also provides a high-temperature and high-pressure nuclear magnetic displacement method for a movable mounting platform, including the following specific use steps:

[0023] Step 1: Place the core or coal rock sample in the holder, connect the confining pressure loading interface and the temperature loading interface, adjust the temperature and confining pressure through the preheater and the confining pressure controller, and monitor the environmental parameters in real time;

[0024] Step 2: Select the displacement medium through the gas booster pipeline and adjust it to the experimental gas pressure;

[0025] Step 3: Start the displacement process and use the NMR platform to scan and monitor the dynamic changes of the fluid in the sample in real time;

[0026] Step 4: Monitor the flow rate or volume change during the displacement process through the flowmeter or weighing scale;

[0027] Step 5: After the experiment, turn off the equipment and analyze the data.

[0028] Technical effects and advantages of the present invention:

[0029] (1) By using the setting method of the cooperation between the gas booster pipeline and the flow monitoring pipeline, and through the synergistic effect of the overburden NMR signal chamber, the preheater and the confining pressure controller, the present invention can accurately simulate the high temperature and high pressure conditions of deep oil and gas reservoirs, providing reliable experimental data support for optimizing oil and gas recovery processes and improving recovery efficiency. At the same time, by using the NMR platform to scan and monitor the dynamic changes of the fluid in the sample in real time, and combining with the auxiliary monitoring of the flowmeter or weighing scale, the accuracy of experimental data and experimental efficiency are significantly improved. This accurate simulation and real-time monitoring ability solves the problems of inaccurate high temperature and high pressure simulation and insufficient monitoring means in the prior art, providing efficient technical support for related research;

[0030] (2) By using the setting method of the cooperation between the gas booster pipeline and the flow monitoring pipeline, the present invention can not only simulate the adsorption and desorption behaviors of coalbed methane under high temperature and high pressure conditions, monitor its dynamic changes in real time, and provide a theoretical basis for the efficient exploitation of coalbed methane, but also support the injection and monitoring of displacement media such as CO2, revealing the interaction mechanism between CO2 and the core or coal rock under high temperature and high pressure conditions, and providing an experimental basis for the optimization of CO2 displacement and storage technologies. In addition, the present invention supports the experimental requirements of various displacement media (such as nitrogen, methane gas, CO2, etc.), is applicable to the research and application in multiple fields such as oil and gas field development, coalbed methane exploitation, CO2 displacement and storage, etc., and has broad versatility and applicability;

[0031] (3) The present invention utilizes the setting method of the gas boosting pipeline and the flow monitoring pipeline in cooperation, and through efficiently simulating the fluid migration process of various displacement media under high temperature and high pressure conditions, the present invention provides technical support for oil and gas resource development and CO2 geological sequestration, and helps to achieve the goals of energy security and environmental protection. Its innovative device design and method not only solve the problem of low experimental efficiency in the prior art, but also provide reliable technical support for the research and application in related fields, with significant social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0033] Figure 2 It is a schematic diagram of the structure at the gas-liquid displacement pipeline of the present invention.

[0034] Figure 3 It is a schematic diagram of the structure at the nuclear magnetic pipeline of the present invention.

[0035] In the figure: 1. Gas-liquid displacement pipeline; 11. Stable displacement pump; 12. Displacement storage tank; 13. Container displacement power liquid switch valve; 14. Container gas-liquid receiving valve; 15. Total gas-liquid outlet valve; 2. CO2 gas displacement pipeline; 21. CO2 gas receiving valve; 22. CO2 intermediate container; 23. Intermediate container displacement power switch valve; 24. Gas displacement receiving valve; 25. CO2 gas heating container; 26. CO2 displacement outlet valve; 3. Methane gas pipeline; 31. Methane gas pipeline valve; 32. Vacuum pump; 33. Methane gas receiving valve; 34. Reference tank; 35. Methane gas output valve; 301. Waste gas vent valve; 4. Conventional gas pipeline; 41. Switch needle valve; 5. Gas boosting pipeline; 51. Gas cylinder; 52. Gas cylinder valve; 53. Gas cylinder pressure reducing valve; 54. Total gas source inlet switch; 55. Boosting pump; 56. Boosting storage tank; 57. Gas pressure reducing valve; 6. Drain valve; 7. Nuclear magnetic pipeline; 71. Nuclear magnetic bearing platform; 72. Clamp; 73. Clamp temperature sensor; 74. Confining pressure loading interface; 75. Temperature loading interface; 76. Heating liquid storage tank; 77. Preheater; 78. Preheater temperature sensor; 79. Confining pressure liquid storage tank; 710. Confining pressure controller; 711. Confining pressure valve; 712. Inlet pressure sensor; 8. Flow monitoring pipeline; 81. Outlet pressure sensor; 82. Back pressure valve; 83. Manual pump; 84. Flowmeter control valve; 85. Flowmeter; 86. Weight scale control valve; 87. Weight scale. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] The present invention provides a high-temperature and high-pressure nuclear magnetic displacement device with a movable bearing platform as shown in Figures 1-3 and includes:

[0038] A gas-liquid displacement pipeline 1 for performing liquid or gas displacement experiments;

[0039] A CO2 gas displacement pipeline 2 using CO2 as a displacement medium to perform CO2 gas displacement experiments;

[0040] A methane gas pipeline 3 using methane gas as an adsorption medium to perform methane gas displacement experiments;

[0041] A conventional gas pipeline 4 using nitrogen as a displacement medium to perform nitrogen displacement experiments;

[0042] A gas pressurization pipeline 5 for inputting and pressurizing the gases in the CO2 gas displacement pipeline 2, the methane gas pipeline 3, and the conventional gas pipeline 4;

[0043] A drain valve 6 for draining the liquid in the gas-liquid displacement pipeline 1 and the CO2 gas displacement pipeline 2, facilitating the discharge of the liquid generated during the experiment, ensuring the cleanliness and safety of the experimental system, and avoiding the influence of liquid accumulation on the experimental results;

[0044] A nuclear magnetic pipeline 7 is connected to the gas-liquid displacement pipeline 1, the CO2 gas displacement pipeline 2, the methane gas pipeline 3, and the conventional gas pipeline 4 through pipelines, and the dynamic changes of the fluid during the process are monitored in real time through nuclear magnetic resonance technology;

[0045] A flow rate monitoring pipeline 8 for monitoring the flow rate and pressure changes of the displacement medium.

[0046] The gas-liquid displacement pipeline 1 includes a stable displacement pump 11, a storage system, and a total gas-liquid outlet valve 15. Multiple groups of storage systems are arranged in parallel pipelines, and multiple groups of storage systems are connected to the stable displacement pump 11 and the total gas-liquid outlet valve 15 in series pipelines. The storage system includes a displacement storage tank 12, a container displacement power liquid switch valve 13, and a container gas-liquid receiving valve 14. The container displacement power liquid switch valve 13 and the container gas-liquid receiving valve 14 are respectively connected to both ends of the displacement storage tank 12. The stable displacement pump 11 is used to provide stable displacement power to ensure that the displacement medium enters the experimental system at a constant flow rate. Ensure the stability of the displacement process, avoid the influence of flow fluctuations on the experimental results, and improve the reliability of experimental data. The displacement storage tank 12 is used to store the displacement medium and provide an adequate displacement source for the experiment. Ensure the continuous supply of the displacement medium and support the operation requirements of long-term experiments. The container displacement power liquid switch valve 13 is used to control the on-off of the displacement medium and adjust the flow rate of the displacement power liquid. Achieve precise control of the displacement medium and meet the flow rate adjustment requirements under different experimental conditions. The container gas-liquid receiving valve 14 is used to receive and control the entry of the gas-liquid displacement medium. Ensure the accurate input of the displacement medium and avoid medium leakage or excessive input. The total gas-liquid outlet valve 15 is used to control the discharge of the gas-liquid displacement medium. Achieve the effective recovery or discharge of the displacement medium and improve the safety and environmental protection of the experiment.

[0047] The CO2 gas displacement pipeline 2 includes a CO2 gas receiving valve 21, a CO2 intermediate container 22, an intermediate container displacement power switch valve 23, a gas displacement receiving valve 24, a CO2 gas heating container 25, and a CO2 displacement outlet valve 26. One end of the CO2 gas receiving valve 21 is connected to the gas boosting pipeline 5, and the other end of the CO2 gas receiving valve 21 is connected between the CO2 gas heating container 25 and the CO2 intermediate container 22. The gas displacement receiving valve 24 is connected between the CO2 intermediate container 22 and the CO2 gas heating container 25. The intermediate container displacement power switch valve 23 is connected between the CO2 intermediate container 22 and the drain valve 6. The CO2 displacement outlet valve 26 is connected between the CO2 gas heating container 25 and the nuclear magnetic pipeline 7. The CO2 gas receiving valve 21 is used to control the entry of CO2 gas, ensuring the precise input of CO2 gas and avoiding gas leakage or waste. The CO2 intermediate container 22 is used to store CO2 gas, providing a stable CO2 source for the displacement experiment and ensuring the continuous supply of CO2 gas to support long-term displacement experiments. The intermediate container displacement power switch valve 23 is used to control the displacement power of CO2 gas, achieving precise control of CO2 gas displacement and meeting the flow requirements under different experimental conditions. The gas displacement receiving valve 24 is used to receive and control the entry of CO2 gas, ensuring the precise input of CO2 gas and avoiding gas leakage or excessive input. The CO2 gas heating container 25 is used to heat CO2 gas to simulate the displacement process under high-temperature conditions, realizing CO2 displacement experiments under high-temperature and high-pressure conditions and revealing the interaction mechanism between CO2 and the core. The CO2 displacement outlet valve 26 is used to control the discharge of CO2 gas, realizing the effective recovery or discharge of CO2 gas and improving the safety and environmental protection of the experiment.

[0048] The methane gas pipeline 3 includes a methane gas pipeline valve 31, a vacuum pump 32, a methane gas receiving valve 33, a reference tank 34, and a methane gas output valve 35. The methane gas pipeline valve 31 is connected to the conventional gas pipeline 4 and the gas booster pipeline 5 as a node. The vacuum pump 32 is arranged between the methane gas pipeline valve 31 and the reference tank 34. The methane gas receiving valve 33 and the methane gas output valve 35 are respectively connected to the inlet and outlet of the reference tank 34, and a tank pressure sensor is provided on the reference tank 34. The methane gas pipeline valve 31 is used to control the entry of methane gas, ensuring the precise input of methane gas and avoiding gas leakage or waste. The vacuum pump 32 is used to evacuate the experimental system and remove the air in the system, improving the accuracy of the experiment and avoiding the influence of air on the experimental results. The methane gas receiving valve 33 is used to receive and control the entry of methane gas, ensuring the precise input of methane gas and avoiding gas leakage or excessive input. The reference tank 34 is used as a reference container for methane gas displacement to compare experimental data, improving the reliability and comparability of experimental data. The methane gas output valve 35 is used to control the discharge of methane gas, realizing the effective recovery or emission of methane gas and improving the safety and environmental protection of the experiment. The waste gas vent valve 301 is used to discharge the waste gas generated during the experiment, ensuring the safety of the experimental system and avoiding the influence of waste gas accumulation on the experimental environment.

[0049] The conventional gas pipeline 4 includes a switch needle valve 41. The switch needle valve 41 is connected between the methane gas pipeline valve 31 and the nuclear magnetic pipeline 7. The switch needle valve 41 is used to control the on / off and flow rate of the conventional gas, realizing the precise control of the conventional gas and meeting the flow rate requirements under different experimental conditions.

[0050] The gas boosting pipeline 5 includes a gas storage system, a main gas source inlet switch 54, a booster pump 55, a boosted storage tank 56, and a gas pressure reducing valve 57. Multiple groups of gas storage systems are arranged in parallel pipelines. The main gas source inlet switch 54 is connected between the gas storage system and the booster pump 55. The outlet of the booster pump 55 is connected to the inlet of the boosted storage tank 56. The gas pressure reducing valve 57 is connected to the outlet end of the boosted storage tank 56, and the pipeline between the boosted storage tank 56 and the gas pressure reducing valve 57 is connected to the CO2 gas receiving valve 21. The gas storage system includes a gas cylinder 51, a cylinder valve 52, and a cylinder pressure reducing valve 53. The gas cylinder 51, the cylinder valve 52, and the cylinder pressure reducing valve 53 are arranged in a series pipeline. The gas cylinder 51 is used to store the boosted gas, providing sufficient gas source for the experiment, ensuring continuous supply of the boosted gas and supporting long-time high-pressure experiments. The cylinder valve 52 is used to control the inlet and outlet of the gas in the gas cylinder, ensuring accurate input and output of the boosted gas and avoiding gas leakage or waste. The cylinder pressure reducing valve 53 is used to reduce the pressure of the boosted gas and adjust the gas pressure, achieving precise control of the gas pressure and meeting the pressure requirements under different experimental conditions. The on-off of the main gas source inlet switch 54 ensures accurate input of the gas and avoids gas leakage or excessive input. The booster pump 55 is used to boost the gas to meet the requirements of high-pressure experiments, realizing gas displacement experiments under high-pressure conditions and revealing the migration law of fluids under high-pressure environments. The boosted storage tank 56 is used to store the boosted gas, providing sufficient gas source for the experiment, ensuring continuous supply of the boosted gas and supporting long-time high-pressure experiments. The gas pressure reducing valve 57 is used to reduce the pressure of the boosted gas and adjust the gas pressure, achieving precise control of the gas pressure and meeting the pressure requirements under different experimental conditions. Preferably, an exhaust gas vent valve 301 is connected to the outlet end of the methane gas pipeline valve 31.

[0051] The nuclear magnetic resonance pipeline 7 includes a nuclear magnetic resonance base 71, a gripper 72, a gripper temperature sensor 73, an overburden pressure loading interface 74, a temperature loading interface 75, a heating liquid storage tank 76, a preheater 77, a preheater temperature sensor 78, an overburden pressure liquid storage tank 79, an overburden pressure controller 710, an overburden pressure valve 711, and an inlet pressure sensor 712. An overburden nuclear magnetic resonance signal cavity is provided inside the nuclear magnetic resonance base 71. The gripper 72 is arranged inside the nuclear magnetic resonance signal cavity. The gripper temperature sensor 73 is installed on the gripper 72. The overburden pressure loading interface 74 is connected to both ends of the nuclear magnetic resonance base 71. The temperature loading interface 75 is connected to the gripper 72. Both ends of the heating liquid storage tank 76 are connected to the preheater 77. The preheater temperature sensor 78 is arranged on the preheater 77, and both ends of the preheater 77 are installed on the temperature loading interface 75. Both ends of the overburden pressure controller 710 are respectively connected to the two overburden pressure loading interfaces 74. The overburden pressure valve 711 is arranged on the overburden pressure controller 710. Both ends of the overburden pressure liquid storage tank 79 are connected to the overburden pressure controller 710. The overburden pressure valve 711 is arranged on the overburden pressure controller 710. The inlet pressure sensor 712 is connected to one of the overburden pressure loading interfaces 74, and the other overburden pressure loading interface 74 is connected to the flow monitoring pipeline 8. The nuclear magnetic resonance base 71 is used to carry the sample and perform nuclear magnetic resonance scanning. To realize the real-time monitoring of the fluid in the sample and improve the accuracy of experimental data, a common signal cavity is also provided in the nuclear magnetic resonance base 71. The gripper 72 is used to fix the sample to ensure its stability during the experiment. To avoid sample displacement or damage and improve the stability and reliability of the experiment. The gripper temperature sensor 73 is used to monitor the temperature of the gripper to ensure that the experimental temperature meets the requirements. To ensure the precise control of the experimental temperature and improve the reliability of experimental data. The overburden pressure loading interface 74 is used to load the overburden pressure to simulate a high-temperature and high-pressure environment. To realize the experimental requirements under high-temperature and high-pressure conditions and reveal the migration law of the fluid in a complex environment. The temperature loading interface 75 is used to load the temperature to simulate a high-temperature environment. To realize the experimental requirements under high-temperature conditions and reveal the migration law of the fluid in a high-temperature environment. The heating liquid storage tank 76 is used to store the heating liquid to provide a heat source for the experiment. To ensure the continuous supply of the heating liquid and support long-term high-temperature experiments. The preheater 77 is used to preheat the displacement medium to simulate a high-temperature environment. To realize the displacement experiment under high-temperature conditions and reveal the migration law of the fluid in a high-temperature environment. The preheater temperature sensor 78 is used to monitor the temperature of the preheater to ensure that the experimental temperature meets the requirements. To ensure the precise control of the experimental temperature and improve the reliability of experimental data. The overburden pressure liquid storage tank 79 is used to store the overburden pressure liquid to provide an overburden pressure source for the experiment. To ensure the continuous supply of the overburden pressure liquid and support long-term high-pressure experiments. The overburden pressure controller 710 is used to control the loading and adjustment of the overburden pressure. To realize the precise control of the overburden pressure and meet the pressure requirements under different experimental conditions. The overburden pressure valve 711 is used to control the loading and release of the overburden pressure. To ensure the precise control of the overburden pressure and avoid the influence of pressure fluctuations on the experimental results.The inlet pressure sensor 712 is used to monitor the inlet pressure to ensure that the experimental pressure meets the requirements, guarantee the precise control of the experimental pressure, and improve the reliability of the experimental data.

[0052] The flow monitoring pipeline 8 includes an outlet pressure sensor 81, a backpressure valve 82, a manual pump 83, a flowmeter control valve 84, a flowmeter 85, a weight scale control valve 86, and a weight scale 87. The outlet pressure sensor 81 is connected between the confining pressure loading interface 74 and the backpressure valve 82. The manual pump 83, the flowmeter 85, and the weight scale 87 are all installed at the outlet end of the backpressure valve 82. The flowmeter control valve 84 is installed at the inlet end of the flowmeter 85. The weight scale control valve 86 is installed at the inlet end of the weight scale 87. The outlet pressure sensor 81 is used to monitor the outlet pressure to ensure that the experimental pressure meets the requirements, guarantee the precise control of the experimental pressure, and improve the reliability of the experimental data. The backpressure valve 82 is used to control the outlet pressure and maintain the pressure balance of the experimental system, avoid the influence of pressure fluctuations on the experimental results, and improve the stability of the experimental data. The manual pump 83 is used to manually adjust the flow rate and pressure of the displacement medium, provide a flexible way to adjust the flow rate and pressure, and meet the requirements under different experimental conditions. The flowmeter control valve 84 is used to control the on / off and flow rate of the flow monitoring pipeline, achieve precise control of the flow rate, and meet the flow rate requirements under different experimental conditions. The flowmeter 85 is used to monitor the flow rate of the displacement medium and provide real-time flow rate data, reveal the flow rate change law during the displacement process, and improve the accuracy of the experimental data. The weight scale control valve 86 is used to control the measurement and recording of the weight scale, provide real-time weight data, and reveal the weight change law during the displacement process. The weight scale 87 is used to measure the weight of the displacement medium and provide real-time weight data, reveal the weight change law during the displacement process, and improve the accuracy of the experimental data.

[0053] Example 1

[0054] Select a displacement storage tank 12 with an appropriate capacity. For example, select a 1500 ML displacement storage tank 12. Open the container displacement power liquid switch valve 13 and the drain valve 6, and load gas / liquid through the container gas / liquid receiving valve 14 until the displacement storage tank 12 is filled with gas / liquid. Wait until the drain valve 6 stops discharging liquid stably after 30 minutes, which means the displacement storage tank 12 is full. Then close the drain valve 6, start the stable displacement pump 11, prepare the displacement power liquid, set a certain displacement pressure, and open the total gas / liquid outlet valve 15 to conduct a displacement experiment. During the displacement process, use the NMR platform 71 for real-time scanning. If it is a liquid displacement, the weight scale control valve 86 needs to be opened, and the weight scale 87 is used to detect the volume change; if it is a gas, the flowmeter control valve 84 is opened, and the flowmeter 85 is used for monitoring.

[0055] Example 2

[0056] When the methane gas adsorption and desorption experiments are completed, the CO2 displacement experiment begins, and the production of methane gas is observed. First, close the gas pressure reducing valve 57, open the gas cylinder valve 52 and the gas cylinder pressure reducing valve 53 to open the CO2 gas cylinder in the gas storage cylinder 51, open the main gas source inlet switch 54, and turn on the booster pump 55 to pump CO2 into the booster storage tank 56 and set the ideal air pressure. At this time, open the CO2 gas receiving valve 21, the gas displacement receiving valve 24, the intermediate container displacement power switch valve 23, and the drain valve 6 to fill the CO2 intermediate container 22 with CO2. The piston moves downward, and the displacement power liquid is discharged through the intermediate container displacement power switch valve 23 and the drain valve 6. Close the drain valve 6 when there is no liquid flowing out for 30 minutes. Subsequently, according to the experimental requirements of the CO2 state, adjust the temperature through the CO2 gas heating container 25. After setting the temperature, turn on the stable displacement pump 11, prepare the displacement power liquid, set a certain displacement pressure, and open the CO2 displacement outlet valve 26 to conduct the CO2 displacement. During the displacement process, use the nuclear magnetic platform 71 for real-time scanning to observe the changes in adsorbed gas and free gas in the coal rock, and observe the flow rate changes during the displacement through the flow meter 85.

[0057] Example 3

[0058] In this experiment, the core is first placed in the confining pressure nuclear magnetic signal cavity, and then the confining pressure loading interface 74 and the temperature loading interface 75 are connected. Next, close the waste gas vent valve 301, the switch needle valve 41, open the methane gas pipeline valve 31, the methane gas receiving valve 33, the methane gas output valve 35, and the vacuum pump 32 to evacuate the entire methane gas pipeline 3. After pumping to a negative pressure, close the vacuum pump 32 and the methane gas output valve 35. Control the preheater 77 and the confining pressure controller 710 according to the experimental conditions, and observe the preheater temperature sensor 78 and the confining pressure valve 711 to set a certain temperature and confining pressure. By opening another set of gas cylinder valves 52 and gas cylinder pressure reducing valves 53, open the CO2 methane gas cylinder in the gas storage cylinder 51, open the main gas source inlet switch 54, and turn on the booster pump 55 to pump methane into the booster storage tank 56 and set the ideal air pressure. Control the gas pressure reducing valve 57 according to the experimental conditions and observe the pressure gauge of the reference tank 34 to obtain the experimental air pressure. Then open the back pressure valve 82 and set a pressure greater than the experimental air pressure to prevent gas escape. Finally, open the methane gas output valve 35 to allow methane gas to enter the confining pressure nuclear magnetic signal cavity of the nuclear magnetic platform 71 to start the adsorption experiment, and scan through the nuclear magnetic platform 71 to observe the changes in adsorbed gas and free gas. During the adsorption process of the coal rock, when the set adsorption time is not reached, nuclear magnetic scanning is not required. At this time, the nuclear magnetic platform 71 can be moved to align the magnet with the coal rock sample saturated with water in the ordinary signal cavity for scanning.

[0059] Example 4

[0060] In this experiment, the core is first placed in the nuclear magnetic bearing platform 71 to cover the nuclear magnetic signal cavity, and then the confining pressure loading interface 74 and the temperature loading interface 75 are connected. Next, the preheater 77 and the confining pressure controller 710 are controlled according to the experimental conditions, and the preheater temperature sensor 78 and the confining pressure valve 711 are observed to set a certain temperature and confining pressure. By opening the last set of gas cylinder valves 52 and the gas cylinder pressure reducing valve 53, the nitrogen gas cylinder in the gas storage cylinder 51 is opened, the main gas source inlet switch 54 is opened, and the booster pump 55 is started to inject nitrogen into the booster storage tank 56 and set the ideal air pressure. Next, the methane gas pipeline valve 31 and the waste gas vent valve 301 are closed, and the gas pressure reducing valve 57 is controlled according to the experimental conditions to obtain the experimental air pressure. The needle valve 41 is opened and it is observed whether the inlet pressure sensor 712 and the outlet pressure sensor 81 reach the experimental air pressure. After reaching the experimental conditions, nuclear magnetic resonance is carried out using the nuclear magnetic bearing platform 71.

[0061] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-temperature and high-pressure nuclear magnetic displacement device with a movable platform, characterized in that: include: A gas-liquid displacement pipeline (1) for conducting liquid or gas displacement experiments; A CO2 gas displacement pipeline (2) is used to carry out a CO2 gas displacement experiment by using CO2 as a displacement medium; A methane gas pipeline (3) is used to perform a methane gas displacement experiment by using methane gas as an adsorption medium; Conventional gas pipeline (4), using nitrogen as the displacement medium to conduct nitrogen displacement experiments; A gas pressurizing pipeline (5) is used for inputting and pressurizing the gas of the CO2 gas displacement pipeline (2), the methane gas pipeline (3) and the conventional gas pipeline (4); A liquid discharge valve (6) for treating liquid discharge from the gas-liquid displacement pipeline (1) and the CO2 gas displacement pipeline (2); The nuclear magnetic resonance pipeline (7) is connected to the gas-liquid displacement pipeline (1), the CO2 gas displacement pipeline (2), the methane gas pipeline (3) and the conventional gas pipeline (4) through pipelines, and the dynamic changes of the fluid in the process are monitored in real time by the nuclear magnetic resonance technology; The flow monitoring pipeline (8) is used to monitor flow rate or volume change.

2. A high-temperature and high-pressure nuclear magnetic displacement device with a movable platform according to claim 1, characterized in that: The gas-liquid displacement pipeline (1) comprises a stable displacement pump (11), a storage system and a total gas-liquid outlet valve (15); a plurality of groups of the storage systems are arranged in parallel in pipelines, and a plurality of groups of the storage systems are connected in series with the stable displacement pump (11) and the total gas-liquid outlet valve (15); the storage system comprises a displacement storage tank (12), a container displacement power fluid switch valve (13) and a container gas-liquid receiving valve (14); the container displacement power fluid switch valve (13) and the container gas-liquid receiving valve (14) are respectively connected to two ends of the displacement storage tank (12).

3. A high-temperature and high-pressure nuclear magnetic displacement device with a movable platform according to claim 1, characterized in that: The CO2 gas displacement pipeline (2) comprises a CO2 gas receiving valve (21), a CO2 intermediate container (22), an intermediate container displacement power switch valve (23), a gas displacement receiving valve (24), a CO2 gas heating container (25) and a CO2 displacement outlet valve (26); one end of the CO2 gas receiving valve (21) is connected to the gas pressurization pipeline (5); the other end of the CO2 gas receiving valve (21) is connected between the CO2 gas heating container (25) and the CO2 intermediate container (22); the gas displacement receiving valve (24) is connected between the CO2 intermediate container (22) and the CO2 gas heating container (25); the intermediate container displacement power switch valve (23) is connected between the CO2 intermediate container (22) and the drain valve (6); and the CO2 displacement outlet valve (26) is connected between the CO2 gas heating container (25) and the nuclear magnetic resonance pipeline (7).

4. The high-temperature and high-pressure nuclear magnetic displacement device with a movable platform according to claim 1, characterized in that: The methane gas pipeline (3) comprises a methane gas pipeline valve (31), a vacuum pump (32), a methane gas receiving valve (33), a reference tank (34) and a methane gas output valve (35); the methane gas pipeline valve (31) is connected to a conventional gas pipeline (4) and a gas booster pipeline (5) as a node; the vacuum pump (32) is arranged between the methane gas pipeline valve (31) and the reference tank (34); the methane gas receiving valve (33) and the methane gas output valve (35) are respectively connected to an inlet and an outlet of the reference tank (34); and a tank pressure sensor is arranged on the reference tank (34).

5. A high-temperature and high-pressure nuclear magnetic displacement device with a movable platform according to claim 4, characterized in that: The conventional gas pipeline (4) comprises a switch needle valve (41), and the switch needle valve (41) is connected between the methane gas pipeline valve (31) and the nuclear magnetic resonance pipeline (7).

6. The high-temperature and high-pressure nuclear magnetic displacement device with a movable platform according to claim 3, characterized in that: The gas boosting pipeline (5) comprises a gas storage system, a total gas source inlet switch (54), a boosting pump (55), a boosting storage tank (56) and a gas pressure reducing valve (57). Multiple groups of the gas storage systems are arranged in parallel in a pipeline. The total gas source inlet switch (54) is connected between the gas storage system and the boosting pump (55). The outlet of the boosting pump (55) is connected to the inlet of the boosting storage tank (56). The gas pressure reducing valve (57) is connected to the outlet end of the boosting storage tank (56). The pipeline between the boosting storage tank (56) and the gas pressure reducing valve (57) is connected to the CO2 gas receiving valve (21). The gas storage system comprises a gas cylinder (51), a gas cylinder valve (52) and a gas cylinder pressure reducing valve (53). The gas cylinder (51), the gas cylinder valve (52) and the gas cylinder pressure reducing valve (53) are arranged in series in a pipeline.

7. The high-temperature and high-pressure nuclear magnetic displacement device with a movable platform according to claim 4, characterized in that: The outlet end of the methane gas pipeline valve (31) is connected to a waste gas vent valve (301).

8. The high-temperature and high-pressure nuclear magnetic displacement device with a movable platform according to claim 1, characterized in that: The nuclear magnetic pipeline (7) comprises a nuclear magnetic support (71), a clamp (72), a clamp temperature sensor (73), a confining pressure loading interface (74), a temperature loading interface (75), a heating liquid storage tank (76), a preheater (77), a preheater temperature sensor (78), a confining pressure liquid storage tank (79), a confining pressure controller (710), a confining pressure valve (711) and an inlet pressure sensor (712); a confining pressure nuclear magnetic signal cavity is arranged inside the nuclear magnetic support (71); the clamp (72) is arranged inside the nuclear magnetic signal cavity; the clamp temperature sensor (73) is mounted on the clamp (72); the confining pressure loading interface (74) is connected to two ends of the nuclear magnetic support (71); the temperature loading interface (75) is connected to the clamp (72); The two ends of the heating liquid storage tank (76) are connected to the preheater (77), the preheater temperature sensor (78) is arranged on the preheater (77), and the two ends of the preheater (77) are installed on the temperature loading interface (75), the two ends of the confining pressure controller (710) are respectively connected to the two confining pressure loading interfaces (74), the confining pressure valve (711) is arranged on the confining pressure controller (710), the two ends of the confining pressure liquid storage tank (79) are connected to the confining pressure controller (710), the confining pressure valve (711) is arranged on the confining pressure controller (710), the inlet pressure sensor (712) is connected to one of the confining pressure loading interfaces (74), and the other confining pressure loading interface (74) is connected to the flow monitoring pipeline (8).

9. A high-temperature and high-pressure nuclear magnetic displacement device with a movable platform according to claim 8, characterized in that: The flow monitoring pipeline (8) comprises an outlet pressure sensor (81), a back pressure valve (82), a manual pump (83), a flow meter control valve (84), a flow meter (85), a weight scale control valve (86) and a weight scale (87); the outlet pressure sensor (81) is connected between the confining pressure loading interface (74) and the back pressure valve (82); the manual pump (83), the flow meter (85) and the weight scale (87) are all installed at the outlet end of the back pressure valve (82); the flow meter control valve (84) is installed at the inlet end of the flow meter (85); and the weight scale control valve (86) is installed at the inlet end of the weight scale (87).

10. A high-temperature and high-pressure nuclear magnetic displacement method for a movable support, using a high-temperature and high-pressure nuclear magnetic displacement device for a movable support as claimed in any one of claims 1 to 9, characterized in that: The specific usage steps are as follows: Step 1: Place the core or coal rock sample in the holder (72), connect the confining pressure loading interface (74) and the temperature loading interface (75), adjust the temperature and confining pressure through the preheater (77) and the confining pressure controller (710), and monitor the environmental parameters in real time; Step 2: Select the displacement medium through the gas booster pipeline (5) and adjust it to the experimental gas pressure; Step 3: starting the displacement process, and using the nuclear magnetic platform (71) to scan and monitor the dynamic changes of the fluid in the sample in real time; Step 4: monitoring the flow rate or volume change during the displacement process by means of a flow meter (85) or a weight scale (87); Step 5: After the experiment, turn off the equipment and analyze the data.

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