CN116181413A - Double-well construction visual physical simulation system and method for salt cavern gas storage - Google Patents
Double-well construction visual physical simulation system and method for salt cavern gas storage Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 claims abstract description 50
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
The invention discloses a double-well construction visual physical simulation system and method for a salt cavern gas storage, belonging to the technical field of construction of salt cavern underground gas storage; the double-well cavity-making physical simulation subsystem consists of a water injection system, an oil injection system, a brine measuring system, a cavity-making form monitoring system and a simulation pipe column system; the double-well gas injection and halogen discharge physical simulation subsystem consists of a gas injection system, a halogen discharge system, a flow field test system and a simulation pipe column system. The invention also provides a double-well construction visual physical simulation method for the salt cavern gas storage. The technical scheme of the invention adopts large-size salt to simulate the double-well cavity-making process of different salt caverns, and monitors the cavity form expansion process in real time. The technical scheme of the invention has the physical simulation experiment function of gas injection and halogen discharge, can simulate the gas injection and halogen discharge process and analyze the motion characteristics of a flow field.
Description
Technical Field
The invention relates to the technical field of salt cavern underground reservoir construction, in particular to a salt cavern gas storage double-well reservoir construction visual physical simulation system and method.
Background
Natural gas underground reservoirs are the most efficient, reliable peak shaving and storage means. The salt cavern gas storage is one of main gas storage types, has the advantages of high injection and production efficiency, large short-term throughput, low cushion gas amount and complete recovery, and the salt cavern cavity is a good carrier for storing natural gas, thus having important strategic significance in Western gas and east transport engineering in China.
The salt cavern construction geological conditions in China are complex, and different from the foreign salt cavern gas storage which selects salt dome (the salt layer thickness is 300-500 m) to construct the warehouse, the salt cavern gas storage is mainly constructed in a layered salt layer in China, the layered salt layer level difference (the insoluble content is 15-35%), the salt layer is thin (60-250 m), and the burial depth (the flat top mountain and Chuzhou are more than 2000 m), because of the harsh warehouse construction geological conditions, a plurality of technical difficulties are brought to the drilling and completion engineering construction of the domestic gas warehouse. The long cavity-making time of a single well of the salt cavern gas storage, difficult cavity shape control, high cost and high energy consumption become main factors for restricting the speed and benefit of salt cavern construction. The double-well cavity construction is suitable for thin salt layers and deep layer construction, is an effective way for realizing quick dissolution of the gas storage to yield, and is difficult to realize cavity shape design and control, so that physical simulation experiment research is needed to be carried out.
Building a salt cavern gas storage double-well construction visualization physical simulation system, testing the dynamic process of the cavity form development change by developing a salt cavern gas storage double-well construction physical simulation experiment, testing the fluid convection diffusion distribution characteristics in the cavity construction process, and optimizing the double-well cavity construction process parameters; and (3) carrying out a physical simulation experiment of salt cavern double-well library construction, gas injection and halogen discharge, evaluating the utilization rate of insoluble sediment space, and simulating the gas injection and halogen discharge process indoors. Can effectively improve the salt cavern construction benefit and promote the construction process of salt cavern gas storage in China.
Disclosure of Invention
The invention aims to provide a double-well construction visualization physical simulation system for a salt cavern gas storage, which is used for forming a cavity-making process parameter optimization scheme through experiments and guiding site construction.
Embodiments of the present invention are implemented as follows:
in one aspect, the embodiment of the invention provides a double-well construction visualization physical simulation system of a salt cavern gas storage, which comprises a double-well cavity construction physical simulation subsystem and a double-well gas injection and halogen discharge physical simulation subsystem;
the double-well cavity-making physical simulation subsystem consists of a water injection system, an oil injection system, a brine measuring system, a cavity-making form monitoring system and a simulation pipe column system. The water injection system and the oil injection system are connected with the left side simulation pipe column system through pipelines, and have the functions of injecting clear water and diesel oil into the experimental model respectively. The brine measuring system is connected with the right side simulation tubular column system through a pipeline, and has the function of monitoring the concentration and flow of discharged brine. The cavity-making form monitoring system is connected to the lowest pipe column part of the simulation pipe column system and has the function of monitoring the internal form of the experimental model. The water injection system, the oil injection system, the brine measuring system, the cavity-making form monitoring system and the simulated pipe column system are controlled by the cavity-making control system. The cavity creating control system comprises a cavity shape monitoring control module, a water injection and oil injection quantity control module, an inner pipe and outer pipe position control module and a cavity creating data acquisition module; the cavity shape monitoring control module is used for performing cavity shape monitoring control, the water injection and oil injection quantity control module is used for controlling water injection and oil injection quantity, the inner and outer pipe position control module is used for controlling the positions of the inner and outer pipes, and the cavity making data acquisition module is used for acquiring cavity making data;
the double-well gas injection and halogen discharge physical simulation subsystem consists of a gas injection system and a halogen discharge system. The gas injection system is connected with the left cavity of the salt cavern model through a pipe column and has the function of injecting air into the salt cavern model; the brine discharging system is connected with the cavity on the right side of the salt cavern model through a pipe column, and has the functions of collecting and monitoring discharged brine. The gas injection system and the halogen discharge system are controlled by a gas injection and halogen discharge control system; the gas injection and brine discharge control system comprises a pneumatic valve control module, a monitoring module and a data acquisition module, wherein the pneumatic valve control module is used for realizing the operation of injecting gas into the salt cavern model through controlling the pneumatic valve, the monitoring module is used for monitoring the condition of discharged brine, and the data acquisition module is used for acquiring data of discharged brine.
In a preferred embodiment of the invention, the water injection system comprises a first liquid storage tank, a advection pump and a pressure sensor. Clear water in the experimental process is sourced from a first liquid storage tank, a advection pump is connected with the liquid storage tank through a hose, and after the advection pump is started, the clear water is pumped into a pipeline, flows into an inner pipe in a left side simulation pipe column system through a pressure sensor, and enters an experimental model. The flow range of the advection pump is 0-500ml/min, and the precision is 1%; the capacity of the liquid storage tank is 50L; the measuring range of the pressure sensor is 0-1000 KPa, and the precision is +/-0.1%.
In the scheme, the oiling system comprises a gas mass flow controller, a safety valve, a pneumatic valve and a one-way valve. In the experimental process, diesel oil needs to be injected into an experimental model, and the injection procedure of the diesel oil is as follows: the gas enters an oil storage tank with the capacity of 3L through a gas mass flow controller via a one-way valve, the pressure of the oil storage tank is increased to press the diesel oil at the bottom into an oiling pipeline, and then the diesel oil enters an experimental model via a middle pipe of a simulation pipe column system to float on water to form an oil pad.
In the above scheme, brine measurement system includes concentration meter, liquid storage pot. The brine measuring system is connected with the right-side simulation tubular column system in the figure 1, and has the main functions of collecting and recording brine discharged from the experimental model. Brine in the experimental model flows through the simulated pipeline through the concentration meter and then enters the liquid storage tank. The brine concentration measuring range of the concentration meter is 380g/L, and the measuring precision is 0.1%.
In the scheme, the cavity forming form monitoring system mainly comprises a laser emitter and an endoscopic probe, the part is connected to the bottommost part of an inner pipe in the simulation pipe column system, and the interior of the cavity is scanned and detected by combining infrared emission and image processing technology. The diameter of the endoscopic probe is 5mm, and the length is 5mm.
Further, the simulated string system includes an inner tube, an intermediate tube, an outer tube, and a top string lifting device. The bottom of the inner tube is connected with the cavity-making form monitoring system, the middle tube is connected with the water injection system, and the outer tube is connected with the oil injection system. The system utilizes a top lifting device to adjust the depth of the inner tube, the middle tube and the outer tube.
Further, the gas injection system comprises an air compressor and a gas mass flow controller. The system belongs to a part of a double-well gas injection and halogen discharge physical simulation subsystem, and is mainly used for injecting gas into a salt cavity model, sucking external air by an air compressor, pumping the air into a pipeline, and enabling a part of gas to enter the salt cavity model through a gas mass flow controller. The working flow range of the gas mass flow controller is 0-500ml/min, and the working pressure is 3MPa.
Further, the brine discharging system comprises a mechanical booster pump, a buffer container, a back pressure valve, a gas flowmeter, a dryer and a liquid level meter. The air pumped by the other part of air compressors enters the buffer container and is pressurized by the mechanical booster pump through the back pressure valve to the salt cavity model. When the pressure in the cavity of the salt cavern model is larger than the limiting pressure of the back pressure valve, brine and a small amount of gas in the cavity sequentially enter the liquid level meter, the dryer and the gas flowmeter through the back pressure valve for collecting and monitoring the brine and the exhaust gas.
On the other hand, the embodiment of the invention provides a double-well construction visualization physical simulation method for a salt cavern gas storage, which comprises a double-well cavity construction physical simulation experiment and a gas injection and halogen discharge physical simulation experiment;
wherein, the physical simulation experiment of the double-well cavity building comprises the following steps:
1) Connecting all the devices according to a flow chart of the double-well cavity-making physical simulation subsystem device;
2) Checking whether a valve, a pressure sensor, a advection pump and the like are in a normal working state;
3) In order to check the tightness of the experimental device, saturated brine is added into a liquid storage tank, a valve, a horizontal flow pump and monitoring equipment are opened, the saturated brine flows into the liquid storage tank of a right-side brine monitoring system after passing through a pipeline and an experimental model, whether the pumping quantity is consistent with the brine discharge quantity is compared, and if the consistency indicates that the tightness of the device is good, the next experiment is carried out. If the brine discharge amount is smaller than the pumping amount, checking the tightness of each part of pipeline in a sectional way until the pumping amount is consistent with the brine discharge amount.
4) Opening a pipeline valve, a pressure sensor and a concentration meter according to experimental requirements;
5) Starting a horizontal pump to pump fresh water in the liquid storage tank into an experimental model, and recording the brine concentration in real time by using a concentration meter;
6) In the experimental process, the heights of the middle pipe and the outer pipe of the simulation pipe column system are adjusted according to the experimental design, and the diesel pumping quantity is adjusted;
7) After the cavity forming stage of each step is finished, the advection pump is closed, the height of the inner tube is adjusted, and the cavity form of the stage is scanned by the cavity forming form monitoring system and recorded.
8) Repeating the steps 5) -7) until the experiment is finished.
The gas injection and halogen discharge physical simulation experiment comprises the following steps:
1) Connecting all the devices according to a flow chart of the gas injection and halogen discharge physical simulation subsystem device;
2) Checking whether the air compressor, the gas mass flow controller, the gas flowmeter and the like are in a normal working state;
3) In order to check the tightness of the experimental device, the back pressure valve is closed, a small amount of air is injected, whether the gas mass flow controller has reading change or not is observed, if no reading change indicates that the tightness of the experimental device is good, the next experiment can be carried out, and if the reading change indicates that the gas leakage exists, the tightness of the experimental device is checked in sections.
4) And opening the pipeline valve according to the experiment requirement, and then opening the air compressor to start the experiment.
5) In the experimental process, a visual window of the equipment is used for observing the change of insoluble matters in the gas injection and halogen discharge process;
6) In the experimental process, the insoluble matter state is recorded by a camera at intervals, the discharged halogen water quantity is recorded by a liquid level meter, and the discharged gas quantity is recorded by a gas flowmeter.
The embodiment of the invention has the beneficial effects that:
the invention provides a salt cavern gas storage double-well library construction visual physical simulation system and a method, which adopt large-size salt (experimental model) to simulate different salt cavern double-well cavity construction processes and monitor the cavity form expansion process in real time. The technical scheme of the invention has the physical simulation experiment function of gas injection and halogen discharge, can simulate the gas injection and halogen discharge process, and analyze the change of insoluble substances at different stages and the utilization effect of sediment pore space.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a physical simulation subsystem for double well cavity creation in a visual physical simulation system for double well construction of a salt cavern gas storage;
FIG. 2 is a schematic diagram of a double-well gas injection and halogen removal physical simulation subsystem in a double-well library construction visual physical simulation system of a salt cavern gas storage;
FIG. 3 is a schematic diagram of a simulated string system in a dual well cavity creation physical simulation subsystem.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of 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, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein can be arranged and designed in a wide variety of different configurations.
Referring to fig. 1-3, a first embodiment of the present invention provides a dual-well construction visualization physical simulation system for a salt cavern gas storage, which includes a dual-well cavity-building physical simulation subsystem and a dual-well gas injection and halogen discharge physical simulation subsystem;
the double-well cavity-making physical simulation subsystem consists of a water injection system, an oil injection system, a brine measuring system, a cavity-making form monitoring system and a simulation pipe column system. The water injection system and the oil injection system are connected with the left side simulation pipe column system 10 through pipelines, and have the functions of injecting clear water into the experimental model 12 and injecting diesel oil into the experimental model 12 respectively. The brine measuring system is connected with the right side simulation tubular column system 11 through a pipeline and is used for monitoring the concentration and flow of discharged brine. The cavity-forming form monitoring system is connected to the lowest pipe column part of the simulation pipe column system and is used for monitoring the internal form of the experimental model. The water injection system, the oil injection system, the brine measuring system, the cavity-making form monitoring system and the simulated pipe column system are controlled by the cavity-making control system. The cavity-making control system can perform cavity shape monitoring control, water injection and oil injection quantity control, inner and outer pipe position control, cavity-making data acquisition and the like.
The double-well gas injection and halogen discharge physical simulation subsystem consists of a gas injection system and a halogen discharge system. The gas injection system is connected with the left cavity of the salt cavern model 20 through a pipe column and has the function of injecting air into the salt cavern model 20; the brine discharge system is connected with the cavity on the right side of the salt cavern model 20 through a pipe column, and is used for collecting and monitoring discharged brine, and the gas injection system and the brine discharge system are controlled through a gas injection brine discharge control system. The gas injection and brine discharge control system can realize the operation of injecting gas into the salt cavern model by controlling the pneumatic valve, and has the functions of monitoring and data acquisition of discharged brine.
The water injection system comprises a first liquid storage tank 1, a advection pump 2 and a pressure sensor 3, wherein clear water in an experimental model 12 is sourced from the first liquid storage tank 1, the advection pump 2 and the first liquid storage tank 1 are connected through a hose, the clear water is pumped into a pipeline after the advection pump 2 is started, and flows into a simulation tubular column system and enters the experimental model through the pressure sensor 3.
The oiling system comprises a gas mass flow controller 4, a safety valve 5, a pneumatic valve 6 and a one-way valve 7. The oil pad 8 in the experimental model 12 is formed by sucking air into a pipeline by using the gas mass flow controller 4, then entering the oil storage tank 9 through the one-way valve 7 and the safety valve 5, pressing diesel oil in the oil storage tank 9 into an injection pipeline, and then entering the experimental model through the pneumatic valve 6.
The brine measuring system comprises a concentration meter 13 and a second liquid storage tank 14. The extracted brine in the experimental model 12 flows into the discharge pipeline and then enters the second liquid storage tank 14 through the flowmeter, and the concentration and the flow of the extracted brine are monitored.
The system 15 for monitoring the morphology of the cavity comprises a laser emitter and an endoscopic probe for monitoring the morphology inside the experimental model 12. The experimental model 12 is internally provided with a salt layer 28.
As shown in fig. 3, the simulated pipe column system comprises an inner pipe 16, an intermediate pipe 17, an outer pipe 18 and a pipe column lifting device 19 at the top, the bottom of the inner pipe 16 is connected with the cavity-making form monitoring system 15, the intermediate pipe 17 is connected with the water injection system, and the outer pipe 18 is connected with the oil injection system.
In FIG. 1, the liquid storage tank is made of HDPE material, has a diameter of 415mm, a height of 575mm, a caliber of 200mm and a wall thickness of 1.5mm. The concentration measurement adopts an online concentration monitor, the measurement range is 0-380 g/L, and the working temperature is 5-100 ℃; the measuring precision of the cavity shape monitoring system is +/-1 mm; the simulated pipe column system can be automatically adjusted, the automatic adjusting range of the inner pipe column and the outer pipe column is 0-50 cm, and the positioning accuracy is +/-1 mm. Advection pump flow rate: precision of 0-500 ml/min: 1%; gas mass flow controller working flow: 0-500ml/min, working pressure 3MPa; oil storage tank volume: 3L, the withstand voltage is less than or equal to 3MPa; material of inner tube, middle tube, outer tube in simulation tubular column system: 316L, top lift system adjustable range length: not less than 1m, pitch: 3mm, motor power: 350W; pressure sensor measuring range: 0-1000 KPa, precision: + -0.1%; endoscopic head diameter: 5mm, length: 5mm.
The gas injection system comprises an air compressor pipeline 21 and a gas mass flow controller 4. The air injected by the salt cavern model 20 is provided by an air injection system. The air compressor sucks the external air and enters the salt cavity model through the air mass flow controller 4.
The brine discharging system comprises a mechanical booster pump 22, a buffer container 23, a back pressure valve 24, a gas flowmeter 25, a dryer 26 and a liquid level meter 17, wherein the buffer container 23 is connected with an air compressor pipeline 21, the mechanical booster pump 22 and the back pressure valve 24 and is used for improving the gas pressure in the salt cavity model; the level gauge 17, dryer 26 and gas flow meter 25 are connected in sequence for collecting and monitoring brine and gas discharged from the interior of the salt cavern model 20.
The flow rate of the gas mass flow controller in the figure 2 is 0-1000 ml/min, and the working pressure is 20MPa; the working pressure of the back pressure valve is 20MPa; the working pressure of the mechanical booster pump is 20MPa.
A double-well construction visual physical simulation method for a salt cavern gas storage is characterized by comprising a double-well cavity construction physical simulation experiment and a gas injection and halogen discharge physical simulation experiment;
wherein, the physical simulation experiment of the double-well cavity building comprises the following steps:
1) Connecting all the devices according to a flow chart of the double-well cavity-making physical simulation subsystem device;
2) Checking whether a valve, a pressure sensor, a advection pump and the like are in a normal working state;
3) In order to check the tightness of the experimental device, saturated brine is added into a liquid storage tank, a valve, a horizontal flow pump and monitoring devices are opened, after the saturated brine passes through a pipeline and salt, the saturated brine flows into the liquid storage tank, whether the pumping quantity is consistent with the brine discharge quantity is compared, if the consistency indicates that the tightness of the device is good, the next experiment is carried out; if the brine discharge amount is smaller than the pumping amount, checking the tightness of each part of pipeline in a sectional manner until the pumping amount is consistent with the brine discharge amount;
4) Opening a pipeline valve, a pressure sensor and a concentration meter according to experimental requirements;
5) Starting a horizontal pump to pump fresh water in a liquid storage tank into an experimental model shown in the figure 1, and recording brine concentration at a brine discharge port in real time;
6) In the experimental process, the height of the inner and outer pipes of the cavity is adjusted according to the experimental design, and the diesel oil pump inlet amount is adjusted;
7) After the cavity forming stage of each step is finished, the advection pump is closed, the height of the inner pipe is adjusted, and the cavity form of the stage is scanned by the cavity forming form monitoring system and recorded;
8) Repeating the steps 5) -7) until the experiment is finished;
the gas injection and halogen discharge physical simulation experiment comprises the following steps:
1) Connecting all the devices according to a flow chart of the gas injection and halogen discharge physical simulation subsystem device;
2) Checking whether the air compressor, the gas mass flow controller, the gas flowmeter and the like are in a normal working state;
3) In order to check the tightness of the experimental device, the back pressure valve is closed, a small amount of air is injected, whether the gas mass flow controller has reading change or not is observed, if no reading change indicates that the tightness of the experimental device is good, the next experiment can be carried out, and if the reading change indicates that the gas leakage exists, the tightness of the experimental device is checked in sections;
4) Starting an air compressor to perform experiments after opening a pipeline valve according to experiment requirements;
5) In the experimental process, the change of insoluble substances 29 in the gas injection and halogen discharge processes is observed by using a visual window of the equipment;
6) The state of the insoluble matter 29 was recorded with a camera at intervals during the experiment, the amount of halogen water discharged was recorded with a level meter, and the amount of gas discharged was recorded with a gas flow meter.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (9)
1. The double-well construction visual physical simulation system for the salt cavern gas storage is characterized by comprising a double-well cavity construction physical simulation subsystem and a double-well gas injection and halogen discharge physical simulation subsystem;
the double-well cavity-making physical simulation subsystem consists of a water injection system, an oil injection system, a brine measuring system, a cavity-making form monitoring system and a simulation pipe column system; the water injection system and the oil injection system are connected with the left side simulation pipe column system (10) through pipelines, and have the functions of injecting clear water and injecting diesel oil into the experimental model (12) respectively; the brine measuring system is connected with the right side simulation pipe column system (11) through a pipeline and is used for monitoring the concentration and flow of discharged brine; the cavity-forming form monitoring system is connected to the lowest pipe column part of the simulation pipe column system and is used for monitoring the internal form of the experimental model; the water injection system, the oil injection system, the brine measuring system, the cavity-building form monitoring system and the simulated pipe column system are controlled by a cavity-building control system; the cavity creating control system comprises a cavity shape monitoring control module, a water injection and oil injection quantity control module, an inner pipe and outer pipe position control module and a cavity creating data acquisition module; the cavity shape monitoring control module is used for performing cavity shape monitoring control, the water injection and oil injection quantity control module is used for controlling water injection and oil injection quantity, the inner and outer pipe position control module is used for controlling the positions of the inner and outer pipes, and the cavity making data acquisition module is used for acquiring cavity making data;
the double-well gas injection and halogen discharge physical simulation subsystem consists of a gas injection system and a halogen discharge system; the gas injection system is connected with the left cavity of the salt cavern model (20) through a pipe column, and has the function of injecting air into the salt cavern model (20); the brine discharge system is connected with a cavity on the right side of the salt cavern model (20) through a pipe column and is used for collecting and monitoring discharged brine, and the gas injection system and the brine discharge system are controlled through a gas injection brine discharge control system; the gas injection and brine discharge control system comprises a pneumatic valve control module, a monitoring module and a data acquisition module, wherein the pneumatic valve control module is used for realizing the operation of injecting gas into the salt cavern model through controlling the pneumatic valve, the monitoring module is used for monitoring the condition of discharged brine, and the data acquisition module is used for acquiring data of discharged brine.
2. The salt cavern gas storage double-well construction visualization physical simulation system according to claim 1, wherein the water injection system comprises a first liquid storage tank (1), a advection pump (2) and a pressure sensor (3), clear water in the experimental model (12) is sourced from the first liquid storage tank (1), the advection pump (2) and the first liquid storage tank (1) are connected through a hose, the clear water is pumped into a pipeline after the advection pump (2) is started, and flows into the simulation tubular column system through the pressure sensor (3) and enters the experimental model.
3. The salt cavern gas storage double well construction visualization physical simulation system according to claim 1, wherein the oil injection system comprises a gas mass flow controller (4), a safety valve (5), a pneumatic valve (6) and a one-way valve (7); the oil pad (8) in the experimental model (12) is formed by sucking air into a pipeline by using the air mass flow controller (4), then entering the oil storage tank (9) through the one-way valve (7) and the safety valve (5), pressing diesel oil in the oil storage tank (9) into an injection pipeline, passing through the pneumatic valve (6) in the middle, and entering the experimental model.
4. The salt cavern gas storage double well construction visualization physical simulation system according to claim 1, wherein the brine measurement system comprises a concentration meter (13) and a second liquid storage tank (14); the extracted brine in the experimental model (12) flows into the discharge pipeline and enters the second liquid storage tank (14) after passing through the flowmeter, and the concentration and the flow of the extracted brine are monitored.
5. The salt cavern gas storage double well construction visualization physical simulation system according to claim 1, wherein the cavity formation monitoring system (15) comprises a laser emitter and an endoscopic probe for monitoring the formation inside the experimental model (12).
6. The salt cavern gas storage double well construction visualization physical simulation system according to claim 5, wherein the simulation tubular column system comprises an inner tube (16), an intermediate tube (17), an outer tube (18) and a tubular column lifting device (19) at the top, the bottom of the inner tube (16) is connected with the cavity-making form monitoring system (15), the intermediate tube (17) is connected with the water injection system, and the outer tube (18) is connected with the oil injection system.
7. The salt cavern gas storage double well construction visualization physical simulation system according to claim 1, wherein the gas injection system comprises an air compressor pipeline (21) and a gas mass flow controller (4); air injected by the salt cavern model (20) is provided by an air injection system; the air compressor sucks outside air and enters the salt cavity model through the air mass flow controller (4).
8. The salt cavern gas storage double well construction visualization physical simulation system according to claim 1, wherein the brine discharge system comprises a mechanical booster pump (22), a buffer container (23), a back pressure valve (24), a gas flowmeter (25), a dryer (26) and a liquid level meter (27), wherein the buffer container (23) is connected with an air compressor pipeline (21), the mechanical booster pump (22) and the back pressure valve (24) and is used for improving the gas pressure in a salt cavern model; the liquid level meter (27), the dryer (26) and the gas flowmeter (25) are sequentially connected and used for collecting and monitoring brine and gas discharged from the interior of the salt cavern model (20).
9. A double-well construction visual physical simulation method for a salt cavern gas storage is characterized by comprising a double-well cavity construction physical simulation experiment and a gas injection and halogen discharge physical simulation experiment;
wherein, the physical simulation experiment of the double-well cavity building comprises the following steps:
1) Connecting all the devices according to a flow chart of the double-well cavity-making physical simulation subsystem device;
2) Checking whether the valve, the pressure sensor and the advection pump are in a normal working state;
3) In order to check the tightness of the experimental device, saturated brine is added into a liquid storage tank, a valve, a horizontal flow pump and monitoring devices are opened, after the saturated brine passes through a pipeline and salt, the saturated brine flows into the liquid storage tank, whether the pumping quantity is consistent with the brine discharge quantity is compared, if the consistency indicates that the tightness of the device is good, the next experiment is carried out; if the brine discharge amount is smaller than the pumping amount, checking the tightness of each part of pipeline in a sectional manner until the pumping amount is consistent with the brine discharge amount;
4) Opening a pipeline valve, a pressure sensor and a concentration meter according to experimental requirements;
5) Starting a horizontal pump to pump fresh water in the liquid storage tank into an experimental model, and recording the brine concentration at a brine discharge port in real time;
6) In the experimental process, the height of the inner and outer pipes of the cavity is adjusted according to the experimental design, and the diesel oil pump inlet amount is adjusted;
7) After the cavity forming stage of each step is finished, the advection pump is closed, the height of the inner pipe is adjusted, and the cavity form of the stage is scanned by the cavity forming form monitoring system and recorded;
8) Repeating the steps 5) -7) until the experiment is finished;
the gas injection and halogen discharge physical simulation experiment comprises the following steps:
1) Connecting all the devices according to the gas injection and halogen discharge physical simulation subsystem device;
2) Checking whether the air compressor, the gas mass flow controller and the gas flowmeter are in a normal working state;
3) In order to check the tightness of the experimental device, the back pressure valve is closed, a small amount of air is injected, whether the gas mass flow controller has reading change or not is observed, if no reading change indicates that the tightness of the experimental device is good, the next experiment is carried out, and if the reading change indicates that the gas leakage exists, the tightness of the experimental device is checked in sections;
4) Starting an air compressor to perform experiments after opening a pipeline valve according to experiment requirements;
5) In the experimental process, a visual window of the equipment is used for observing the change of insoluble matters in the gas injection and halogen discharge process;
6) In the experimental process, the insoluble matter state is recorded by a camera at intervals, the discharged halogen water quantity is recorded by a liquid level meter, and the discharged gas quantity is recorded by a gas flowmeter.
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