CN114215502B - Multi-exploitation-mode simulated natural gas hydrate three-dimensional development experimental device and method - Google Patents
Multi-exploitation-mode simulated natural gas hydrate three-dimensional development experimental device and method Download PDFInfo
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- CN114215502B CN114215502B CN202111553682.5A CN202111553682A CN114215502B CN 114215502 B CN114215502 B CN 114215502B CN 202111553682 A CN202111553682 A CN 202111553682A CN 114215502 B CN114215502 B CN 114215502B
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- 238000011161 development Methods 0.000 title claims abstract description 138
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 115
- 238000004088 simulation Methods 0.000 claims abstract description 96
- 239000007788 liquid Substances 0.000 claims abstract description 58
- 238000000926 separation method Methods 0.000 claims abstract description 55
- 239000011435 rock Substances 0.000 claims abstract description 21
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 119
- 239000007789 gas Substances 0.000 claims description 111
- 230000015572 biosynthetic process Effects 0.000 claims description 26
- 238000003786 synthesis reaction Methods 0.000 claims description 26
- 238000011084 recovery Methods 0.000 claims description 24
- 238000005065 mining Methods 0.000 claims description 19
- 238000002474 experimental method Methods 0.000 claims description 16
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 8
- 239000003345 natural gas Substances 0.000 claims description 7
- 238000000354 decomposition reaction Methods 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 4
- 238000009489 vacuum treatment Methods 0.000 claims description 4
- 238000010587 phase diagram Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract description 4
- 239000007924 injection Substances 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract 1
- 239000011162 core material Substances 0.000 description 19
- 239000000243 solution Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000013480 data collection Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 210000003437 trachea Anatomy 0.000 description 2
- 206010017472 Fumbling Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- -1 natural gas hydrates Chemical class 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- Mining & Mineral Resources (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a natural gas hydrate three-dimensional development experimental device and method simulated by multiple exploitation modes, belonging to the technical field of natural gas hydrate development physical simulation devices, and comprising the following steps: developing a simulation device main body with a closed space; the temperature sensor unit comprises temperature sensors which are arranged in the closed space in a three-dimensional space and platinum resistance temperature sensors which are pre-buried in the rock core; the pressure control unit is communicated with the closed space; the temperature control unit comprises a constant temperature tank sleeved on the outer side of the development simulation device main body; the water supply unit is communicated with the closed space; the gas-liquid separation unit is communicated with the closed space; the vacuum unit is communicated with the closed space; and the data acquisition unit is electrically connected with the temperature sensor unit, the pressure control unit and the measurement assembly. The invention can control and change the simulated injection pressure, the temperature and flow of the injected hot fluid and other technical parameters of different development modes of the natural gas hydrate to realize the simulation of different development modes.
Description
Technical Field
The invention belongs to the technical field of physical simulation devices for natural gas hydrate development, and particularly relates to a three-dimensional development experimental device and method for natural gas hydrate simulation in a multi-mining mode.
Background
At present, most researches on hydrate exploitation are in the stages of laboratory physical simulation and numerical simulation except single well or single well group trial exploitation in few countries and regions. In order to more truly and effectively know and master important sensitive parameters affecting trial production, such as synthesis and decomposition of the hydrate, different development modes in the exploitation process, reservoir physical properties, temperature, pressure, yield change rules and the like under different development well group conditions, three-dimensional hydrate development experimental simulation is carried out, and particularly, the decomposition behavior of the hydrate is studied on a three-dimensional scale, so that the method has great significance.
In addition, through continuous fumbling and innovation for decades, a one-dimensional long core holder and a two-dimensional vertical well are utilized, three-dimensional large-scale development simulation is a relatively mature technical means, but in the three-dimensional hydrate development simulation experiment conducted in the current domestic laboratory, the fact that the vacuum environment manufactured during the experiment can cause data errors of the experiment due to uneven negative pressure in the model of the kettle is hardly noticed, and most of domestic three-dimensional hydrate development simulation experiment devices are high in cost, single in simulation development environment and almost incapable of being directly changed.
Disclosure of Invention
In order to solve the technical problems, the invention adopts the following technical scheme:
a natural gas hydrate three-dimensional development experimental device with multiple exploitation modes simulation comprises:
the development simulation device comprises a development simulation device main body, wherein the development simulation device main body is provided with a closed space, and the closed space is used for performing three-dimensional natural gas hydrate development simulation on a rock core;
the temperature sensor unit comprises temperature sensors which are arranged in the closed space in a three-dimensional mode and platinum resistance temperature sensors which are pre-buried in the rock core, so that the temperature acquisition of the three-dimensional space distribution of the whole temperature field is realized when the three-dimensional development simulation of the natural gas hydrate is carried out;
the pressure control unit is communicated with the closed space and is used for providing methane gas into the closed space, controlling the pressure in the closed space during development simulation and maintaining the pressure in the synthesis and decomposition process of the natural gas hydrate in the closed space;
the temperature control unit comprises a constant temperature assembly, the constant temperature assembly comprises a constant temperature groove sleeved on the outer side of the development simulation device main body, a retainer is arranged between the constant temperature groove and the development simulation device main body, and the constant temperature groove is used for keeping the temperature of the closed space in the development simulation device so as to realize stable control of the synthesis environment temperature of the natural gas hydrate;
the water supply unit is communicated with the closed space and is used for inputting pure water into the closed space;
the gas-liquid separation unit is communicated with the closed space and is used for carrying out water-gas separation and collection on natural gas generated during three-dimensional development simulation of natural gas hydrate;
the vacuum unit is communicated with the closed space and used for keeping a certain vacuum degree in the closed space;
the data acquisition unit is electrically connected with the temperature sensor unit, the pressure control unit and the measuring assembly for measuring the weight change of the water supply unit and the gas-liquid separation unit, so that the real-time acquisition and recording of the temperature and the pressure in the closed space and the water consumption, the gas consumption, the water yield and the gas yield during the three-dimensional development simulation of the natural gas hydrate are realized.
Further, the pressure control unit comprises a methane cylinder connected with the airtight space, a connecting air pipe is arranged between the methane cylinder and the airtight space, a first one-way valve, a booster pump and a first air mass flowmeter are sequentially arranged on the connecting air pipe, and the first one-way valve is located on one side close to the methane cylinder.
Further, the water supply unit comprises a pure water bottle connected with the closed space, a connecting water pipe is arranged between the pure water bottle and the closed space, a second one-way valve and a constant flow pump are sequentially arranged on the connecting water pipe, and the second one-way valve is positioned at one side close to the pure water bottle; the connecting water pipe is provided with a first opening and closing valve at one end far away from the pure water bottle, the first opening and closing valve is provided with three interfaces, a first interface of the first opening and closing valve is connected with the connecting water pipe, and a second interface of the first opening and closing valve is connected with the connecting air pipe; the third interface of the first valve is connected with a first input pipe, and the other end of the first input pipe is connected with the closed space.
Further, the temperature control unit further comprises a temperature control water tank, a second opening and closing valve is arranged on the first input pipe, a third interface of the second opening and closing valve is connected with the temperature control water tank through a temperature control water pipe, and a third one-way valve, a advection pump and a liquid mass flowmeter are sequentially arranged on the temperature control water pipe, wherein the third one-way valve is close to one side of the temperature control water tank.
Further, the gas-liquid separation unit comprises a gas-liquid separation component, a methane gas collection container and a water recovery container, and the gas-liquid separation component is connected with the closed space through a separation pipeline; a fourth one-way valve is arranged on the separation pipeline; the gas-liquid separation component is used for carrying out water-gas separation on natural gas generated during three-dimensional development simulation of natural gas hydrate;
the methane gas collecting container is connected with the gas collecting pipeline between the gas-liquid separation assembly, the gas collecting pipeline is sequentially provided with a second gas mass flowmeter and a fifth one-way valve, and the second gas mass flowmeter is positioned at one side close to the methane gas collecting container;
the water recovery container is connected with the gas-liquid separation component through a liquid collecting pipeline, and the liquid collecting pipeline is provided with a sixth one-way valve.
Further, the development simulation device main body is provided with a plurality of external pipelines which are communicated with the closed space and are independently arranged, and the external pipelines are respectively connected with the first input pipe, the separation pipeline and the vacuum unit.
Further, the vacuum unit comprises a first external pipeline and a second external pipeline which are oppositely arranged on the development simulation device main body and communicated with the closed space, and a first vacuum pump and a second vacuum pump which are respectively connected with the first external pipeline and the second external pipeline.
Further, the measuring assembly for measuring the weight changes of the water supply unit and the gas-liquid separation unit comprises a first electronic balance and a second electronic balance which are respectively arranged at the lower ends of the pure water bottle and the water recovery container.
The three-dimensional development experimental method for the natural gas hydrate simulated by the multi-mining mode adopts the three-dimensional development experimental device for the natural gas hydrate simulated by the multi-mining mode, and comprises the following steps of:
the working process of natural gas hydrate synthesis comprises the following steps: injecting materials into the closed space of the main body of the development simulation device through the central well pattern, wherein the materials are methane gas, pure water and hot fluid used in development simulation;
in the simulation process, a platinum resistance temperature sensor is pre-buried in a rock core, then the rock core is placed in a closed space of a development simulation device main body, the joint of a well pattern top cover and the device main body is sealed, the connection of a natural gas hydrate three-dimensional development experiment device simulated in a multi-mining mode is completed, all valves are closed, a constant temperature assembly is started, the temperature of the constant temperature assembly is set to be 2+/-0.5 ℃, the rock core environment in the closed space of the development simulation device main body is pre-cooled, and a third opening and closing valve, a fourth opening and closing valve, a fifth opening and closing valve and a pressure gauge are sequentially opened when temperature sensor data arranged in the rock core is stable at a preset temperature; simultaneously starting a first vacuum pump and a second vacuum pump, carrying out vacuum treatment on the environment in the closed space, and closing the first vacuum pump and the second vacuum pump when the value of the pressure gauge stably displays a preset pressure value at the vacuum degree of-0.1 MPa; starting the first electronic balance, the second one-way valve, the fourth one-way valve, the sixth one-way valve, the first on-off valve, the second on-off valve and the constant flow pump, and when pure water is input into the closed space of the development simulation device main body and the mass of the pure water to be input is equal to the value of the recovered pure water in the water recovery container, closing the advection pump, the second one-way valve and the sixth one-way valve; opening a first one-way valve, a fifth one-way valve, a first gas mass flowmeter and a second gas mass flowmeter, opening a methane gas cylinder, a methane gas collecting container and a booster pump, and inputting methane gas into a closed space; the method comprises the steps that the pressure of methane gas is increased by a booster pump, so that the pressure of a closed space is kept constant to 5MPa, when the statistical data display of a second gas mass flowmeter is constant to the data difference value of a first gas mass flowmeter, all equipment except a data acquisition unit and a constant temperature assembly are closed, a main body of the simulation device is subjected to standing development, the data displayed by the data acquisition unit is observed, the data displayed by the data acquisition unit are determined according to a synthesis development phase diagram of natural gas hydrate, and when the data such as pressure, temperature and the like are not changed any more, the completion of synthesis of the natural gas hydrate is proved, and the data acquisition unit acquires real-time data for storage and analysis;
working process I of natural gas hydrate development simulation: after the natural gas hydrate is synthesized in the working process of the natural gas hydrate synthesis, the setting is kept unchanged, a temperature control water tank is opened, the injected saturated NaCl solution is heated to 60 ℃ and kept at a constant temperature, a third one-way valve, a horizontal flow pump, a liquid mass flowmeter and a second opening and closing valve are opened, a fourth one-way valve, a fifth one-way valve, a sixth one-way valve, a gas-liquid separation assembly, a second gas mass flowmeter, a methane gas collection container, a water recovery container and a second electronic balance are arranged, the 60 ℃ saturated NaCl solution is injected into a closed space, the mixture is stood until the development of the natural gas hydrate is completed, and when the metering value of a second body mass flowmeter of the gas is not changed any more, the fact that the development of the natural gas hydrate is completed is proved, and the data acquisition unit acquires the change condition of data in real time is proved;
working process II of natural gas hydrate development simulation: after the natural gas hydrate is synthesized in the working process of the natural gas hydrate synthesis, keeping the setting unchanged, opening a methane gas collecting container, a second gas mass flowmeter, a fifth one-way valve, a sixth one-way valve, a gas-liquid separation assembly, a water recovery container and a second electronic balance, and finally opening a fourth one-way valve, wherein the fourth one-way valve is a back pressure valve and is used for controlling the pressure of a closed space, gradually reducing the pressure of the fourth one-way valve from 5MPa to different pressure values smaller than 5MPa, standing for the development of the natural gas hydrate, and when the metering value of the second gas mass flowmeter is not changed any more, proving that the development of the natural gas hydrate is finished, and collecting real-time data for storage and analysis by a data acquisition unit;
working procedure III of natural gas hydrate development simulation: after the natural gas hydrate is synthesized in the working process of the natural gas hydrate synthesis, the setting is kept unchanged, a temperature control water tank is opened, the injected saturated NaCl solution is heated to 60 ℃ and kept at a constant temperature, a third one-way valve, a horizontal flow pump, a liquid mass flowmeter, a second opening and closing valve, a fifth one-way valve, a sixth one-way valve, a gas-liquid separation assembly, a second gas mass flowmeter, a methane gas collecting container, a water recovery container and a second electronic balance are arranged, and finally a fourth one-way valve is opened, wherein the fourth one-way valve is a back pressure valve and can be used for controlling the pressure of a closed space, gradually reducing the pressure from 5MPa to normal pressure, simultaneously, the 60 ℃ saturated NaCl solution is injected into the closed space, the closed space is kept still for waiting for the development of the natural gas hydrate, when the metering value of the second gas mass flowmeter is not changed, the development of the natural gas hydrate is proved to be completed, the data acquisition unit acquires the change condition of data in real time, and the pressure, the temperature and the gradient change of a core pore in the process are counted and analyzed.
The beneficial effects are that:
the invention provides a three-dimensional development experimental device and method for natural gas hydrate simulated in multiple exploitation modes, which can control and change the technical parameters of different development modes of the natural gas hydrate such as simulated injection pressure, injection hot fluid temperature and the like, and the device can realize the simulation of different development modes by modularized assembly so as to optimize the development parameters, and meanwhile, a multidirectional simultaneous vacuumizing treatment scheme is added to the designed device, so that errors caused by uneven negative pressure can be eliminated to the greatest extent.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a natural gas hydrate three-dimensional development experimental device simulated by a multi-mining mode;
FIG. 2 is a schematic view of a sensor arrangement in a core according to the present invention;
FIG. 3 is a schematic diagram of a typical natural gas hydrate phase stable pressure-temperature relationship;
wherein, 1, a methane cylinder; 2. a first one-way valve; 3. a booster pump; 4. a first gas mass flow meter; 5. a first electronic balance; 6. pure water bottle; 7. a second one-way valve; 8. a constant flow pump; 9. a first opening/closing valve; 10. a methane gas collection vessel; 11. a second gas mass flow meter; 12. a fifth check valve; 13. a second electronic balance; 14. a water recovery container; 15. a sixth one-way valve; 16. a gas-liquid separation assembly; 17. a fourth one-way valve; 18. a temperature controlled water tank; 19. a third one-way valve; 20. a advection pump; 21. a second opening/closing valve; 22. a constant temperature assembly; 23. a data acquisition unit; 24. a first vacuum pump; 25. a first pressure gauge; 26. a second pressure gauge; 27. a third pressure gauge; 28. a second vacuum pump; 29. a fourth pressure gauge; 30. developing a simulation device main body; 31. a third opening/closing valve; 32. a fourth opening valve; 33. a fifth opening/closing valve; 34. a sixth opening and closing valve; 35. a liquid mass flowmeter.
Detailed Description
Example 1
The three-dimensional development experimental device for the natural gas hydrate simulated in the multi-mining mode is used for providing a closed environment and development simulation environments of different well pattern arrangements, and can be used for carrying out data acquisition, numerical control and the like on the temperature and the pressure during synthesis and decomposition of the natural gas hydrate on the rock core under the environments.
Referring to fig. 1, a three-dimensional development experiment device for natural gas hydrate by multi-mining mode simulation includes a development simulation device main body 30, a temperature sensor unit, a pressure control unit, a temperature control unit, a water supply unit, a gas-liquid separation unit, a vacuum unit and a data acquisition unit 23.
The development simulation device main body 30 has a closed space for performing three-dimensional natural gas hydrate development simulation on the core; the development simulator body 30 is distributed through the deployed well pattern, which may connect pipes. In this embodiment, the development simulation apparatus main body 30 adopts a one-injection four-production working condition through a five-point distribution well pattern, and the center well pattern is injected with materials, wherein the injected materials are methane gas, pure water, and hot fluid, such as NaCl solution, used in development simulation.
The temperature sensor unit comprises temperature sensors with three-dimensional space arranged in the closed space and platinum resistance temperature sensors pre-embedded in the rock core, so that the temperature acquisition of the three-dimensional space distribution of the whole temperature field is realized when the three-dimensional development simulation of the natural gas hydrate is carried out.
The pressure control unit is communicated with the closed space and is used for providing methane gas into the closed space, controlling the pressure in the closed space during development simulation and maintaining the pressure in the synthesis and decomposition process of the natural gas hydrate in the closed space.
The temperature control unit comprises a constant temperature assembly 22, the constant temperature assembly 22 comprises a constant temperature groove sleeved on the outer side of the development simulation device main body 30, a retainer is arranged between the constant temperature groove and the development simulation device main body 30, and the constant temperature groove is used for keeping the temperature of a closed space in the development simulation device so as to realize stable control of the synthesis environment temperature of the natural gas hydrate.
The water supply unit is communicated with the closed space and is used for inputting pure water into the closed space.
The gas-liquid separation unit is communicated with the closed space and is used for separating water from gas and collecting natural gas generated during three-dimensional development simulation of the natural gas hydrate.
And the vacuum unit is communicated with the closed space and is used for keeping a certain vacuum degree in the closed space.
The data acquisition unit 23 is electrically connected with the temperature sensor unit, the pressure control unit and the measuring assembly for measuring the weight change of the water supply unit and the gas-liquid separation unit, so as to realize real-time acquisition and recording of the temperature and the pressure in the closed space and the water consumption, the gas consumption, the water yield and the gas yield when the three-dimensional development simulation of the natural gas hydrate is carried out.
In this embodiment, the development simulation device main body 30 is a cubic device frame with 320mm, the specific effects of the development simulation of the corresponding well pattern can be combined through the top covers with different well pattern arrangements, polyurethane is used for sealing the top covers and the cubic device frame during development simulation to form a closed environment, the platinum resistance temperature sensor is arranged on the upper, middle and lower three layers in the closed environment, 4 sensor measuring points are arranged on each layer, the longitudinal spacing is 90mm, the transverse spacing is 90mm, and the platinum resistance temperature sensor is pre-embedded in a large rock core material to be subjected to development simulation in advance.
In this embodiment, the pressure control unit includes the methane gas cylinder 1 that is connected with airtight space, is provided with the connecting trachea between methane gas cylinder 1 and the airtight space, has set gradually first check valve 2, booster pump 3 and first gas mass flowmeter 4 on the connecting trachea, and first check valve 2 is located the one side that is close to methane gas cylinder 1. The booster pump 3 can pressurize the methane gas to a desired pressure and can inject the methane gas into the closed space in the development simulator main body 30.
The pressure control unit further comprises a first pressure gauge 25, a second pressure gauge 26, a third pressure gauge 27 and a fourth pressure gauge 29 which are arranged at the well pattern extraction outlet, and can collect pressure changes in the closed space in real time.
In the embodiment, the water supply unit comprises a pure water bottle 6 connected with the closed space, a connecting water pipe is arranged between the pure water bottle 6 and the closed space, a second one-way valve 7 and a constant flow pump 8 are sequentially arranged on the connecting water pipe, and the second one-way valve 7 is positioned at one side close to the pure water bottle 6; the end of the connecting water pipe, which is far away from the pure water bottle 6, is provided with a first opening and closing valve 9, the first opening and closing valve 9 is provided with three interfaces, the first interface of the first opening and closing valve 9 is connected with the connecting water pipe, and the second interface of the first opening and closing valve 9 is connected with the connecting air pipe; the third port of the first valve 9 is connected to a first input pipe, and the other end of the first input pipe is connected to the closed space.
Wherein the constant flow pump 8 can smoothly input pure water into a closed environment (closed space) in the development simulation apparatus main body 30.
In this embodiment, the temperature control unit further includes a temperature-controlled water tank 18, the first input pipe is provided with a second opening and closing valve 21, a third interface of the second opening and closing valve 21 is connected with the temperature-controlled water tank 18 through a temperature-controlled water pipe, and the temperature-controlled water pipe is sequentially provided with a third check valve 19, a advection pump 20 and a liquid mass flowmeter 35, where the third check valve 19 is located at a side close to the temperature-controlled water tank 18.
In the present embodiment, the gas-liquid separation unit includes a gas-liquid separation assembly 16, a methane gas collection vessel 10, and a water recovery vessel 14, the gas-liquid separation assembly 16 being connected to the closed space through a separation pipe; a fourth one-way valve 17 is arranged on the separation pipeline; the gas-liquid separation assembly 16 is used for water-gas separation of natural gas produced during simulation of three-dimensional development of natural gas hydrates.
In this embodiment, the gas-liquid separation assembly 16 is a gas-liquid separation device, which belongs to the prior art and is not described herein.
The methane gas collecting vessel 10 is connected with a gas collecting pipeline between the gas-liquid separation assembly 16, the gas collecting pipeline is sequentially provided with a second gas mass flowmeter 11 and a fifth one-way valve 12, and the second gas mass flowmeter 11 is positioned at one side close to the methane gas collecting vessel 10.
In the present embodiment, a first gas mass flow meter 4 and a second gas mass flow meter 11 are disposed at the outlets of the methane gas cylinder 1 and the methane gas collecting vessel 10 for detecting the usage amount or the production amount of methane gas.
The water recovery container 14 is connected with the gas-liquid separation assembly 16 through a liquid collecting pipeline, and the liquid collecting pipeline is provided with a sixth one-way valve 15.
In this embodiment, the development simulation apparatus main body 30 is provided with a plurality of external pipes which are communicated with the closed space and are independently arranged, and the plurality of external pipes are respectively connected with the first input pipe, the separation pipe and the vacuum unit.
In the present embodiment, the vacuum unit includes first and second external pipes which are oppositely disposed on the development simulator main body 30 and communicate with the closed space, and first and second vacuum pumps 24 and 28 which are connected to the first and second external pipes, respectively.
Wherein the first vacuum pump 24 and the second vacuum pump 28 can maintain the vacuum degree of the closed space in the development simulation apparatus main body 30. The first vacuum pump 24 and the second vacuum pump 28 are two vacuum pumps of the same model.
In this embodiment, the first external pipeline and the second external pipeline are disposed opposite to each other along the diagonal well pattern, so as to reduce the influence on the non-uniformity of the negative pressure in the core during the vacuum treatment in the closed environment, the first vacuum pump 24 is sequentially connected to the third valve 31 along the pipeline path, and the second vacuum pump 28 is sequentially connected to the fourth valve 32 along the pipeline path.
In the present embodiment, the measuring assembly for measuring the weight change of the water supply unit and the gas-liquid separation unit includes a first electronic balance 5 and a second electronic balance 12 provided at lower ends of the pure water bottle 6 and the water recovery container 14, respectively.
Wherein a pure water bottle 6 is placed on the first electronic balance 5 with an accurate value of 0.001g for accurately measuring the consumption of water in the pure water bottle 6. The water recovery vessel 14 was placed on the second electronic balance 13 with an accurate value of 0.001g for accurately metering the collection amount of the liquid by the water recovery vessel.
In this embodiment, the fourth check valve 17 is a back pressure valve, and can control the outlet pressure of the production wellhead, which is the central wellhead in this embodiment.
In the present embodiment, the data collection unit 23 is a computer data collection system.
Example 2
The embodiment adopts the three-dimensional development experimental device of the natural gas hydrate simulated in the multi-mining mode provided by the embodiment 1, and the three-dimensional development experimental method of the natural gas hydrate simulated in the multi-mining mode provided by the embodiment comprises the following steps:
the working process of natural gas hydrate synthesis comprises the following steps: injecting materials into the closed space of the development simulation device main body 30 through the central well pattern, wherein the materials are methane gas, pure water and hot fluid used in development simulation;
in the simulation process, a platinum resistance temperature sensor is pre-buried in a rock core, then the rock core is placed in a closed space of a development simulation device main body 30, the joint of a well pattern top cover and the device main body is sealed, the connection of a natural gas hydrate three-dimensional development experiment device simulated in a multi-mining mode is completed, all valves are closed, a constant temperature assembly 22 is started, the temperature of the constant temperature assembly 22 is set to be 2+/-0.5 ℃, the rock core environment in the closed space of the development simulation device main body 30 is pre-cooled, and a third opening and closing valve 31, a fourth opening and closing valve 32, a fifth opening and closing valve 33, a sixth opening and closing valve 34, a first pressure gauge 25, a second pressure gauge 26, a third pressure gauge 27 and a fourth pressure gauge 29 are sequentially opened when temperature sensor data arranged in the rock core is stabilized at a preset temperature; simultaneously starting the first vacuum pump 24 and the second vacuum pump 28, carrying out vacuum treatment on the environment in the closed space, and closing the first vacuum pump 24 and the second vacuum pump 28 when the value of the pressure gauge stably displays a preset pressure value at the vacuum degree of-0.1 MPa; starting the first electronic balance 5, the second electronic balance 12, the second one-way valve 7, the fourth one-way valve 17, the sixth one-way valve 15, the first on-off valve 9, the second on-off valve 21 and the constant flow pump 8, and closing the advection pump 20, the second one-way valve 7 and the sixth one-way valve 15 when pure water is input into the closed space of the development simulation device main body 30 and the mass of the pure water to be input is equal to the value of the recovered pure water in the water recovery container 14; opening a first check valve 2, a fifth check valve 12, a first gas mass flowmeter 4 and a second gas mass flowmeter 11, opening a methane gas bottle 1, a methane gas collecting container and a booster pump 3, and inputting methane gas into a closed space; wherein, the booster pump 3 increases the pressure of methane gas, so that the pressure of the closed space is kept constant to 5MPa, and when the statistical data of the second gas mass flowmeter 11 shows the data difference value from the first gas mass flowmeter 4 to be constant, all the devices except the data acquisition unit 23 and the constant temperature component 22 are closed, the main body 30 of the simulation device is developed by standing, the data displayed by the data acquisition unit 23 is observed, and the data acquisition unit 23 acquires real-time data for storage and analysis according to the synthesis development phase diagram of the natural gas hydrate, when the data such as pressure, temperature and the like are not changed any more, and the synthesis of the natural gas hydrate is proved to be completed.
Working process I of natural gas hydrate development simulation: after the natural gas hydrate is synthesized in the working process of the natural gas hydrate synthesis, the setting is kept unchanged, a temperature control water tank 18 is opened, the injected saturated NaCl solution is heated to 60 ℃ and kept at a constant temperature, a third one-way valve 19, a horizontal flow pump 20, a liquid mass flowmeter 35, a second on-off valve 21, a fourth one-way valve 17, a fifth one-way valve 12, a sixth one-way valve 15, a gas-liquid separation assembly 16, a second gas mass flowmeter 11, a methane gas collection container, a water recovery container 14 and a second electronic balance 12 are opened, the 60 ℃ saturated NaCl solution is injected into a closed space, the closed space is stood for waiting for the development of the natural gas hydrate to be completed, and when the metering value of a gas second body mass flowmeter is not changed any more, the data acquisition unit 23 acquires the change condition of data in real time after the development of the natural gas hydrate is proved.
Working process II of natural gas hydrate development simulation: after the natural gas hydrate is synthesized in the working process of the natural gas hydrate synthesis, keeping the setting unchanged, opening a methane gas collecting container, a second gas mass flowmeter 11, a fifth one-way valve 12, a sixth one-way valve 15, a gas-liquid separation assembly 16, a water recovery container 14 and a second electronic balance 12, and finally opening a fourth one-way valve 17, wherein the fourth one-way valve 17 is a back pressure valve and is used for controlling the pressure of a closed space, gradually reducing the pressure from 5MPa to different pressure values smaller than 5MPa, standing for waiting for the development of the natural gas hydrate, and when the metering value of the second gas mass flowmeter 11 is not changed any more, proving that the development of the natural gas hydrate is finished, and collecting real-time data for storage and analysis by a data collecting unit 23.
Working procedure III of natural gas hydrate development simulation: after the natural gas hydrate is synthesized in the working process of the natural gas hydrate synthesis, the setting is kept unchanged, the temperature control water tank 18 is opened, the injected saturated NaCl solution is heated to 60 ℃ and kept at a constant temperature, the third one-way valve 19, the horizontal flow pump 20, the liquid mass flowmeter 35, the second on-off valve 21, the fifth one-way valve 12, the sixth one-way valve 15, the gas-liquid separation assembly 16, the second gas mass flowmeter 11, the methane gas collecting container, the water recovery container 14 and the second electronic balance 12 are all kept unchanged, the fourth one-way valve 17 is opened finally, wherein the fourth one-way valve 17 is a back pressure valve and can be used for controlling the pressure of the closed space, gradually reducing the pressure from 5MPa to normal pressure, simultaneously, the 60 ℃ saturated NaCl solution is injected into the closed space, standing is waited for after the development of the natural gas hydrate is completed, when the measured value of the second gas mass flowmeter 11 is no longer changed, the development of the natural gas hydrate is proved, the data collecting unit 23 collects the data change conditions in real time, and the gradient changes of the pressure, the temperature and the rock core pore are analyzed statistically.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical principles of the present invention still fall within the scope of the technical solutions of the present invention.
Claims (8)
1. The three-dimensional development experimental method of the natural gas hydrate simulated by the multi-mining mode is characterized by comprising the following steps of:
the development simulation device comprises a development simulation device main body, wherein the development simulation device main body is provided with a closed space, and the closed space is used for performing three-dimensional natural gas hydrate development simulation on a rock core;
the temperature sensor unit comprises temperature sensors which are arranged in the closed space in a three-dimensional mode and platinum resistance temperature sensors which are pre-buried in the rock core, so that the temperature acquisition of the three-dimensional space distribution of the whole temperature field is realized when the three-dimensional development simulation of the natural gas hydrate is carried out;
the pressure control unit is communicated with the closed space and is used for providing methane gas into the closed space, controlling the pressure in the closed space during development simulation and maintaining the pressure in the synthesis and decomposition process of the natural gas hydrate in the closed space;
the temperature control unit comprises a constant temperature assembly, the constant temperature assembly comprises a constant temperature groove sleeved on the outer side of the development simulation device main body, a retainer is arranged between the constant temperature groove and the development simulation device main body, and the constant temperature groove is used for keeping the temperature of the closed space in the development simulation device so as to realize stable control of the synthesis environment temperature of the natural gas hydrate;
the water supply unit is communicated with the closed space and is used for inputting pure water into the closed space;
the gas-liquid separation unit is communicated with the closed space and is used for carrying out water-gas separation and collection on natural gas generated during three-dimensional development simulation of natural gas hydrate;
the vacuum unit is communicated with the closed space and used for keeping a certain vacuum degree in the closed space;
the data acquisition unit is electrically connected with the temperature sensor unit, the pressure control unit and the measuring assembly for measuring the weight change of the water supply unit and the gas-liquid separation unit, so that the real-time acquisition and recording of the temperature and the pressure in the closed space and the water consumption, the gas consumption, the water yield and the gas yield during the three-dimensional development simulation of the natural gas hydrate are realized;
the three-dimensional development experimental method for the natural gas hydrate simulated by the multi-mining mode comprises the following steps of:
the working process of natural gas hydrate synthesis comprises the following steps: injecting materials into the closed space of the main body of the development simulation device through the central well pattern, wherein the materials are methane gas, pure water and hot fluid used in development simulation;
in the simulation process, a platinum resistance temperature sensor is pre-buried in a rock core, then the rock core is placed in a closed space of a development simulation device main body, the joint of a well pattern top cover and the device main body is sealed, the connection of a natural gas hydrate three-dimensional development experiment device simulated in a multi-mining mode is completed, all valves are closed, a constant temperature assembly is started, the temperature of the constant temperature assembly is set to be 2+/-0.5 ℃, the rock core environment in the closed space of the development simulation device main body is pre-cooled, and a third opening and closing valve, a fourth opening and closing valve, a fifth opening and closing valve and a pressure gauge are sequentially opened when temperature sensor data arranged in the rock core is stable at a preset temperature; simultaneously starting a first vacuum pump and a second vacuum pump, carrying out vacuum treatment on the environment in the closed space, and closing the first vacuum pump and the second vacuum pump when the value of the pressure gauge stably displays a preset pressure value at the vacuum degree of-0.1 MPa; starting the first electronic balance, the second one-way valve, the fourth one-way valve, the sixth one-way valve, the first on-off valve, the second on-off valve and the constant flow pump, and when pure water is input into the closed space of the development simulation device main body and the mass of the pure water to be input is equal to the value of the recovered pure water in the water recovery container, closing the advection pump, the second one-way valve and the sixth one-way valve; opening a first one-way valve, a fifth one-way valve, a first gas mass flowmeter and a second gas mass flowmeter, opening a methane gas cylinder, a methane gas collecting container and a booster pump, and inputting methane gas into a closed space; the method comprises the steps that the pressure of methane gas is increased by a booster pump, so that the pressure of a closed space is kept constant to 5MPa, when the statistical data display of a second gas mass flowmeter is constant to the data difference value of a first gas mass flowmeter, all equipment except a data acquisition unit and a constant temperature assembly are closed, a main body of the simulation device is subjected to standing development, the data displayed by the data acquisition unit is observed, the data displayed by the data acquisition unit are determined according to a synthesis development phase diagram of natural gas hydrate, and when the data such as pressure, temperature and the like are not changed any more, the completion of synthesis of the natural gas hydrate is proved, and the data acquisition unit acquires real-time data for storage and analysis;
working process I of natural gas hydrate development simulation: after the natural gas hydrate is synthesized in the working process of the natural gas hydrate synthesis, the setting is kept unchanged, a temperature control water tank is opened, the injected saturated NaCl solution is heated to 60 ℃ and kept at a constant temperature, a third one-way valve, a horizontal flow pump, a liquid mass flowmeter and a second opening and closing valve are opened, a fourth one-way valve, a fifth one-way valve, a sixth one-way valve, a gas-liquid separation assembly, a second gas mass flowmeter, a methane gas collection container, a water recovery container and a second electronic balance are arranged, the 60 ℃ saturated NaCl solution is injected into a closed space, the mixture is stood until the development of the natural gas hydrate is completed, and when the metering value of a second body mass flowmeter of the gas is not changed any more, the fact that the development of the natural gas hydrate is completed is proved, and the data acquisition unit acquires the change condition of data in real time is proved;
working process II of natural gas hydrate development simulation: after the natural gas hydrate is synthesized in the working process of the natural gas hydrate synthesis, keeping the setting unchanged, opening a methane gas collecting container, a second gas mass flowmeter, a fifth one-way valve, a sixth one-way valve, a gas-liquid separation assembly, a water recovery container and a second electronic balance, and finally opening a fourth one-way valve, wherein the fourth one-way valve is a back pressure valve and is used for controlling the pressure of a closed space, gradually reducing the pressure of the fourth one-way valve from 5MPa to different pressure values smaller than 5MPa, standing for the development of the natural gas hydrate, and when the metering value of the second gas mass flowmeter is not changed any more, proving that the development of the natural gas hydrate is finished, and collecting real-time data for storage and analysis by a data acquisition unit;
working procedure III of natural gas hydrate development simulation: after the natural gas hydrate is synthesized in the working process of the natural gas hydrate synthesis, the setting is kept unchanged, a temperature control water tank is opened, the injected saturated NaCl solution is heated to 60 ℃ and kept at a constant temperature, a third one-way valve, a horizontal flow pump, a liquid mass flowmeter, a second opening and closing valve, a fifth one-way valve, a sixth one-way valve, a gas-liquid separation assembly, a second gas mass flowmeter, a methane gas collecting container, a water recovery container and a second electronic balance are arranged, and finally a fourth one-way valve is opened, wherein the fourth one-way valve is a back pressure valve and can be used for controlling the pressure of a closed space, gradually reducing the pressure from 5MPa to normal pressure, simultaneously, the 60 ℃ saturated NaCl solution is injected into the closed space, the closed space is kept still for waiting for the development of the natural gas hydrate, when the metering value of the second gas mass flowmeter is not changed, the development of the natural gas hydrate is proved to be completed, the data acquisition unit acquires the change condition of data in real time, and the pressure, the temperature and the gradient change of a core pore in the process are counted and analyzed.
2. The three-dimensional development experimental method for the natural gas hydrate simulated by the multi-mining mode according to claim 1, wherein the pressure control unit comprises a methane gas cylinder connected with the closed space, a connecting gas pipe is arranged between the methane gas cylinder and the closed space, a first one-way valve, a booster pump and a first gas mass flowmeter are sequentially arranged on the connecting gas pipe, and the first one-way valve is close to one side of the methane gas cylinder.
3. The three-dimensional development experimental method for the natural gas hydrate simulated by the multi-mining mode according to claim 2, wherein the water supply unit comprises a pure water bottle connected with the closed space, a connecting water pipe is arranged between the pure water bottle and the closed space, a second one-way valve and a constant flow pump are sequentially arranged on the connecting water pipe, and the second one-way valve is positioned at one side close to the pure water bottle; the connecting water pipe is provided with a first opening and closing valve at one end far away from the pure water bottle, the first opening and closing valve is provided with three interfaces, a first interface of the first opening and closing valve is connected with the connecting water pipe, and a second interface of the first opening and closing valve is connected with the connecting air pipe; the third interface of the first valve is connected with a first input pipe, and the other end of the first input pipe is connected with the closed space.
4. The three-dimensional development experimental method for the natural gas hydrate simulated by the multi-mining mode according to claim 3, wherein the temperature control unit further comprises a temperature control water tank, a second opening and closing valve is arranged on the first input pipe, a third interface of the second opening and closing valve is connected with the temperature control water tank through a temperature control water pipe, and a third one-way valve, a horizontal flow pump and a liquid mass flowmeter are sequentially arranged on the temperature control water pipe, wherein the third one-way valve is close to one side of the temperature control water tank.
5. The three-dimensional development experimental method for the natural gas hydrate simulated by the multi-mining mode according to claim 4, wherein the gas-liquid separation unit comprises a gas-liquid separation assembly, a methane gas collection container and a water recovery container, and the gas-liquid separation assembly is connected with the closed space through a separation pipeline; a fourth one-way valve is arranged on the separation pipeline; the gas-liquid separation component is used for carrying out water-gas separation on natural gas generated during three-dimensional development simulation of natural gas hydrate;
the methane gas collecting container is connected with the gas collecting pipeline between the gas-liquid separation assembly, the gas collecting pipeline is sequentially provided with a second gas mass flowmeter and a fifth one-way valve, and the second gas mass flowmeter is positioned at one side close to the methane gas collecting container;
the water recovery container is connected with the gas-liquid separation component through a liquid collecting pipeline, and the liquid collecting pipeline is provided with a sixth one-way valve.
6. The three-dimensional development experimental method for the natural gas hydrate simulated by the multi-mining mode according to claim 5, wherein a plurality of external pipelines which are communicated with the closed space and are independently arranged are arranged on the development simulation device main body, and the external pipelines are respectively connected with the first input pipe, the separation pipeline and the vacuum unit.
7. The method according to claim 6, wherein the vacuum unit comprises a first external pipeline and a second external pipeline which are relatively arranged on the development simulation device main body and are communicated with the closed space, and a first vacuum pump and a second vacuum pump which are respectively connected with the first external pipeline and the second external pipeline.
8. The three-dimensional development experimental method for natural gas hydrate simulated by multi-mining mode according to claim 7, wherein the measuring assembly for measuring weight changes of the water supply unit and the gas-liquid separation unit comprises a first electronic balance and a second electronic balance respectively arranged at lower ends of the pure water bottle and the water recovery container.
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