CN110793899A - Multi-phase medium seepage test device and test method under microwave excitation - Google Patents
Multi-phase medium seepage test device and test method under microwave excitation Download PDFInfo
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- CN110793899A CN110793899A CN201911110867.1A CN201911110867A CN110793899A CN 110793899 A CN110793899 A CN 110793899A CN 201911110867 A CN201911110867 A CN 201911110867A CN 110793899 A CN110793899 A CN 110793899A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
Abstract
The invention discloses a multiphase medium seepage test device and a test method under the microwave excitation action, wherein the device consists of a triaxial pressure chamber, a hydraulic control system, a microwave excitation system, a temperature control device, a gas injection system and a water injection system, the simulation of microwave excitation of an unconventional natural gas reservoir in different ground pressures, ground temperatures and underground water environments can be realized, the research on the desorption diffusion kinetic rule and the coal rock sample seepage rule of unconventional natural gas (coal bed gas or shale gas and the like) in coal rock under the action of different physical fields (ground pressures, ground temperatures, underground water and microwaves) can be simulated by using the test device, and theoretical research and practical support are provided for the unconventional natural gas mining microwave excitation technology.
Description
Technical Field
The invention relates to a multiphase medium seepage test device and a test method under the action of microwave excitation, in particular to a gas seepage simulation device under the coupling action of multiple physical fields such as a triaxial pressure load, a temperature field, a microwave field and the like in a water-containing environment, and belongs to the seepage test technology.
Background
Along with the increasing demand of energy consumption in China and the improvement of the requirement on the environment, unconventional natural gas is gradually paid attention as clean energy. The unconventional natural gas in China has large reserves and wide distribution, but in the process of exploitation, the unconventional natural gas has lower recovery ratio (extraction rate) under most conditions due to the influence of occurrence conditions and states of the unconventional natural gas. Taking coal seam gas extraction as an example, most coal seams in China have the characteristics of low air permeability, low gas pressure and low gas saturation, so that the coal seam gas extraction rate is generally low.
In order to solve the problems, technologists propose a series of methods and technologies for improving the permeability of unconventional natural gas reservoirs, such as a presplitting blasting technology, a propellant fracturing technology, a hydraulic fracturing and lancing technology, a gas displacement technology, a bacterial degradation technology, a chemical permeability increasing technology, a physical field excitation technology and the like. In recent years, physical field excitation methods represented by acoustic shock, microwave radiation and the like for improving the gas extraction rate of coal seams by promoting the gas desorption of the coal seams and increasing the permeability of coal bodies have attracted wide attention, and particularly, the microwave radiation method has become one of new technical approaches for the enhanced extraction of gas of low-permeability coal seams. However, the microwave-excited infiltration theory is still in the early stage, and the related research is relatively less. Therefore, a simulation test device is urgently needed for exploring and recognizing the seepage and diffusion rules of unconventional natural gas under the conditions of ground stress, ground temperature, underground water, microwave field and other multi-physical fields.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a multiphase medium seepage test device and a test method under the action of microwave excitation, which are simulation devices of gas seepage rules under the coupling action of multiple physical fields (microwave, stress, ground temperature and underground water); the test device is utilized to simulate the complex geomechanical conditions of the natural coal rock stratum in a test room, such as the ground pressure, the ground temperature and the water containing conditions with different burial depths, so that the seepage rule of gas in the coal rock sample under the coupling effect of the environment and the microwave field of the coal rock sample with different characteristics can be researched, and theoretical research and support are provided for the practical application of the novel unconventional natural gas microwave excitation technology.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
a multiphase medium seepage test device under the action of microwave excitation comprises a triaxial pressure chamber, a hydraulic control system, a microwave excitation system, a temperature control system, a gas injection system and a water injection system;
the three-axis pressure chamber comprises a three-axis pressure chamber base and a three-axis pressure chamber box body, and the three-axis pressure chamber box body covers the three-axis pressure chamber base to form a closed three-axis pressure cavity; a piston hole is formed in the top of the box body of the triaxial pressure chamber, a piston rod extends into the triaxial pressure chamber through the piston hole, and an object placing table is arranged on a base of the triaxial pressure chamber; the bottom surface of the piston rod is connected with the top surface of the coal rock sample through a sample cushion block I, and the top surface of the object placing table is connected with the bottom surface of the coal rock sample through a sample cushion block II;
the hydraulic control system comprises a liquid storage tank, an oil inlet and return pipeline and an oil inlet and return channel, wherein the oil inlet and return channel is a sealed liquid channel penetrating through the base of the triaxial pressure chamber and the object placing table, one end of the oil inlet and return channel is communicated through the oil inlet and return pipeline, and the other end of the oil inlet and return channel is communicated with the triaxial pressure chamber;
the microwave excitation system comprises a waveguide tube and quartz glass, wherein a waveguide tube interface is arranged on the side wall of the box body of the triaxial pressure chamber and corresponds to the installation position of the coal rock sample, the quartz glass is arranged in the triaxial pressure chamber and covers the waveguide tube interface, and the waveguide tube extends into the waveguide tube interface and is connected with the quartz glass;
the temperature control system comprises a flexible heating sleeve and a temperature monitoring device, the flexible heating sleeve is coated on the outer wall of the triaxial pressure chamber, and the temperature monitoring device is used for monitoring the temperature of the coal rock sample; the flexible heating sleeve is used for heating the triaxial pressure chamber and sealing the triaxial pressure chamber;
the gas injection system comprises a gas cylinder, a gas inlet pipe, a gas inlet channel, a gas collecting cylinder, a gas return pipe and a gas return channel; the gas inlet channel is a sealed gas channel penetrating through the piston rod and the sample cushion block I, one end of the gas inlet channel is communicated with the gas cylinder through a gas inlet pipe, and the other end of the gas inlet channel is attached to the top surface of the coal rock sample; the air return channel is a sealed air channel penetrating through the base of the triaxial pressure chamber, the object placing table and the sample cushion block II, one end of the air return channel is communicated with the gas collecting bottle through an air return pipe, and the other end of the air return channel is attached to the bottom surface of the coal rock sample; the gas injection system provides seepage gas required in the test for the sample;
the water injection system comprises a liquid tank, a liquid inlet pipe, a liquid inlet channel, a liquid storage tank, a liquid return pipe and a liquid return channel; the liquid inlet channel is a sealed liquid channel penetrating through the base of the triaxial pressure chamber, the object placing table and the sample cushion block II, one end of the liquid inlet channel is communicated with the liquid tank through a liquid inlet pipe, and the other end of the liquid inlet channel is attached to the bottom surface of the coal rock sample; the liquid return channel is a sealed liquid channel penetrating through the piston rod and the sample cushion block I, one end of the liquid return channel is communicated with the liquid storage tank through a liquid return pipe, and the other end of the liquid return channel is attached to the top surface of the coal rock sample.
The triaxial pressure chamber is a key element of the whole device, and can realize gas-liquid seepage research of the coal rock sample under the coupling action of triaxial pressure, microwave excitation, ground temperature and water multi-field.
Specifically, still include strain monitoring devices, strain monitoring devices is used for monitoring the meeting an emergency of coal petrography sample.
Specifically, an electromagnetic valve, a circulating pump, a safety valve I, a flow meter and an oil pressure meter are arranged on the oil inlet and return pipeline.
Specifically, the microwave excitation system further comprises a microwave power supply, a microwave controller, a voltage converter and a microwave generator. The microwave excitation system is connected with the triaxial pressure chamber through a waveguide tube interface; the microwave generator generates and emits microwaves; the waveguide tube transmits microwave to quartz waveguide glass, and the quartz glass is fed into the triaxial pressure chamber; the microwave controller can realize stepless large-range adjustment of microwave power; the voltage converter regulates the voltage input to the microwave sounder. The microwave excitation system provides microwave radiation for the coal rock sample, and can realize the introduction of microwaves with different parameters into the coal rock sample, and carry out the research on the influence of the microwave parameters on the gas seepage rule in the coal sample.
Specifically, a gas injection valve, a gas pump, a pressure reducing valve and a gas pressure gauge are arranged on the gas inlet pipe; the gas return pipe is provided with a gas flowmeter and a gas return valve. The gas injection bottle provides seepage gas for the test; the pressure of the output gas is adjusted by the pressure reducing valve, so that the unconventional gas pressure simulation of different coal strata can be realized; the gas collection tank collects gas flowing through the coal rock sample.
Specifically, a liquid flow meter, a liquid pump, a liquid pressure meter and a safety valve II are arranged on the liquid inlet pipe; and a liquid return valve and a flowmeter are arranged on the liquid return pipe. The liquid injection box provides seepage liquid for the test; the liquid flow meter monitors the liquid flow; the liquid pump provides power for the liquid injection system; a liquid pressure gauge monitors the liquid pressure in the liquid injection process; the safety valve II is used for releasing pressure when the liquid pressure exceeds the rated pressure; the liquid storage tank is used for storing the reflux liquid.
A test method of a multiphase medium seepage test device under the action of microwave excitation comprises the following steps:
(a) preparing a coal rock sample, and ensuring that two end faces of the coal rock sample are parallel and no artificial crack is generated;
(b) placing the coal rock sample between the sample cushion block I and the sample cushion block II, and sleeving a heat-shrinkable tube on the sample cushion block I so that the heat-shrinkable tube completely covers the coal rock sample and covers the lower part of the sample cushion block I and the upper part of the sample cushion block II; hot air is emitted by a blower to enable the heat-shrinkable sleeve to shrink to tightly wrap the coal rock sample, the lower part of the sample cushion block I and the upper part of the sample cushion block II, and the coal rock sample is sealed;
(c) mounting the assembled coal rock sample on a placing table, mounting a strain monitoring device and a temperature monitoring device on the coal rock sample, and covering a triaxial pressure chamber box body; positioning by a positioning pin, ensuring that an oil inlet and return channel, a liquid inlet channel, a liquid return channel, an air inlet channel and an air return channel are smooth, and fastening a triaxial pressure chamber box body and a triaxial pressure chamber base by fastening screws;
(d) connecting an oil inlet and return pipeline with the nonpolar confining pressure oil inlet and outlet, and communicating an oil inlet and return channel; connecting a liquid inlet pipe with a liquid inlet, and connecting a liquid return pipe with a liquid return port, and communicating a liquid inlet channel with a liquid return channel; connecting an air inlet pipe with an air inlet and an air return pipe with an air return port, and communicating an air inlet channel with an air return channel; extending a microwave waveguide tube into a waveguide tube interface to be connected with quartz glass;
(e) injecting gas with certain pressure into the three-axis pressure cavity, closing all valves and determining that the three-axis pressure cavity is complete in air tightness;
(f) carrying out axial pressure loading on the coal rock sample through a piston rod, and stopping the axial pressure loading when the axial pressure reaches a desired value; opening a safety valve I, starting a circulating pump and an electromagnetic valve, injecting nonpolar confining pressure oil into a three-axis pressure cavity to provide confining pressure for a coal rock sample, observing an oil pressure gauge, closing the circulating pump and the electromagnetic valve when the oil pressure is stabilized to a desired value, and closing the safety valve I;
(g) opening a heat source switch, heating the triaxial pressure chamber by a heating power supply through a flexible heating sleeve, monitoring the temperature of the coal rock sample according to a temperature monitoring device, and adjusting the temperature through the heat source switch;
(h) opening a liquid pump, a safety valve II and a liquid return valve, injecting seepage liquid into the coal rock sample, observing a flowmeter and a liquid flowmeter, and closing the liquid pump, the safety valve II and the liquid return valve after the flow of the seepage liquid is stable;
(i) opening a gas injection valve, a pressure reducing valve and a gas return valve, starting a gas pump to inject methane into the coal rock sample, observing a gas pressure meter and a gas flowmeter, and continuing the next operation until the pressure and the flow are stable;
(j) turning on a microwave controller, providing energy by a microwave power supply, converting voltage by a voltage converter, generating microwaves by a microwave generator, and conducting the microwaves to a quartz glass radiant coal rock sample through a waveguide tube; adjusting a microwave controller to enable a microwave generator to generate microwaves with different parameters, observing the changes of a gas pressure meter and a gas flowmeter, and researching the influence of the microwave parameters on the permeability of the sample;
(k) sequentially closing the microwave controller, the gas injection valve and the pressure reducing valve, opening the circulating pump, the electromagnetic valve and the safety valve I, pumping back the nonpolar confining pressure oil, and closing the circulating pump, the electromagnetic valve and the safety valve I after the confining pressure is removed; and simultaneously removing the axial pressure, and finishing the test.
Has the advantages that: the invention provides a multiphase medium seepage test device and a test method under microwave excitation, wherein the device consists of a triaxial pressure chamber, a hydraulic control system, a microwave excitation system, a temperature control device, a gas injection system and a water injection system, can realize the simulation of microwave excitation of unconventional natural gas reservoirs in water environments with different ground pressures, ground temperatures and underground water, can simulate the research of desorption diffusion kinetic rules and coal rock sample seepage rules of unconventional natural gas (coal bed gas or shale gas and the like) in coal rocks under the action of different physical fields (ground pressures, ground temperatures, underground water and microwaves) by using the test device, and provides theoretical research and practical support for an unconventional natural gas mining microwave excitation technology.
Drawings
FIG. 1 is a schematic structural view of the present invention;
the figure includes: 1-a gas cylinder; 2-a gas injection valve; 3-a gas pump; 4-a pressure reducing valve; 5-gas pressure gauge; 6, an air inlet pipe; 7-an air inlet; 8-axial pressure loading; 9-a liquid return port; 10-a liquid return pipe; 11-a liquid return valve; 12-a flow meter; 13-a liquid storage tank; 14-a piston rod; 15-a flexible heating jacket; 16-sample cushion block I; 17-strain monitoring means; 18-quartz glass; 19-waveguide interface; 20-a microwave power supply; 21-a microwave controller; 22-a voltage converter; 23-a microwave generator; 24-a waveguide; 25-a liquid tank; 26-a liquid flow meter; 27-a liquid pump; 28-liquid pressure gauge; 29-safety valve ii; 30-a liquid inlet pipe; 31-a locating pin; 32-liquid inlet; 33-a three-axis pressure chamber base; 34-a return air port; 35-nonpolar confining pressure oil inlet and outlet; 36-a fastening screw; 37-muffler; 38-a gas flow meter; 39-gas collecting bottle; 40-oil inlet and return pipelines; 41-a liquid storage tank; 42-a solenoid valve; 43-circulating pump; 44-safety valve I; 45-a flow meter; 46-oil pressure gauge; 47-coal rock sample; 48-temperature monitoring means; 49-heat shrink tube; 50-a triaxial pressure chamber housing; 51-gas return valve; 52-heat source switch; 53-heating power supply; 54-a placing table; 55-sample cushion block II; 56-a tri-axial pressure chamber; 57-oil inlet and return channels; 58-an intake passage; 59 return air channel; 60-liquid inlet channel; 61-liquid return channel.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Fig. 1 shows a multiphase medium seepage test device under the action of microwave excitation, which comprises a triaxial pressure chamber, a strain monitoring device 17, a hydraulic control system, a microwave excitation system, a temperature control system, a gas injection system and a water injection system.
The triaxial pressure chamber comprises a triaxial pressure chamber base 33 and a triaxial pressure chamber box body 50, and the triaxial pressure chamber box body 50 covers the triaxial pressure chamber base 33 to form a closed triaxial pressure chamber 56; a piston hole is arranged at the top of the triaxial pressure chamber box body 50, the piston rod 14 extends into the triaxial pressure chamber 56 through the piston hole, and an object placing table 54 is arranged on the triaxial pressure chamber base 33; the bottom surface of the piston rod 14 is connected with the top surface of the coal rock sample 47 through a sample cushion block I16, and the top surface of the object placing table 54 is connected with the bottom surface of the coal rock sample 47 through a sample cushion block II 55.
The strain monitoring device 17 is used for monitoring the strain of the coal rock sample 47.
The hydraulic control system comprises a liquid storage tank 41, an oil inlet and return pipeline 40 and an oil inlet and return channel 57, wherein the oil inlet and return channel 57 is a sealed liquid channel penetrating through the triaxial pressure chamber base 33 and the object placing table 54, one end of the oil inlet and return channel 57 is communicated with the oil inlet and return pipeline 40, and the other end of the oil inlet and return channel 57 is communicated with the triaxial pressure chamber 56; the oil supply/return line 40 is provided with an electromagnetic valve 42, a circulation pump 43, a relief valve i 44, a flow meter 45, and an oil pressure gauge 46.
The microwave excitation system comprises a microwave power supply 20, a microwave controller 21, a voltage converter 22, a microwave generator 23, a waveguide tube 24 and quartz glass 18, wherein a waveguide tube interface 19 is arranged on the side wall of a triaxial pressure chamber box body 50, the waveguide tube interface 19 corresponds to the installation position of a coal rock sample 47, the quartz glass 18 is arranged in a triaxial pressure chamber and covers the waveguide tube interface 19, and the waveguide tube 24 extends into the waveguide tube interface 19 and is connected with the quartz glass 18;
the temperature control system comprises a flexible heating sleeve 15 and a temperature monitoring device 48, wherein the flexible heating sleeve 15 is coated on the outer wall of the triaxial pressure chamber, and the temperature monitoring device 48 is used for monitoring the temperature of the coal rock sample 47;
the gas injection system comprises a gas cylinder 1, a gas inlet pipe 6, a gas inlet channel 58, a gas collecting cylinder 39, a gas return pipe 37 and a gas return channel 59; the gas inlet channel 58 is a sealed gas channel penetrating through the piston rod 14 and the sample cushion block I16, one end of the gas inlet channel 58 is communicated with the gas cylinder 1 through the gas inlet pipe 6, and the other end of the gas inlet channel is attached to the top surface of the coal rock sample 47; the air return channel 59 is a sealed air channel penetrating through the triaxial pressure chamber base 33, the object placing table 54 and the sample cushion block II 55, one end of the air return channel 59 is communicated with the gas collecting bottle 39 through an air return pipe 37, and the other end of the air return channel is attached to the bottom surface of the coal rock sample 47; the gas inlet pipe 6 is provided with a gas injection valve 2, a gas pump 3, a pressure reducing valve 4 and a gas pressure gauge 5; the gas return pipe 37 is provided with a gas flow meter 38 and a gas return valve 51.
The water injection system comprises a liquid tank 25, a liquid inlet pipe 30, a liquid inlet channel 60, a liquid storage tank 13, a liquid return pipe 10 and a liquid return channel 61; the liquid inlet channel 60 is a sealed liquid channel penetrating through the triaxial pressure chamber base 33, the object placing table 54 and the sample cushion block II 55, one end of the liquid inlet channel 60 is communicated with the liquid tank 25 through the liquid inlet pipe 30, and the other end of the liquid inlet channel is attached to the bottom surface of the coal rock sample 47; the liquid return channel 61 is a sealed liquid channel penetrating through the piston rod 14 and the sample cushion block I16, one end of the liquid return channel 61 is communicated with the liquid storage tank 13 through the liquid return pipe 10, and the other end of the liquid return channel is attached to the top surface of the coal rock sample 47; a liquid flow meter 26, a liquid pump 27, a liquid pressure gauge 28 and a safety valve II 29 are arranged on the liquid inlet pipe 30; a liquid return valve 11 and a flow meter 12 are arranged on the liquid return pipe 10.
The test method of the multi-phase medium seepage test device under the microwave excitation effect comprises the following steps:
(a) preparation of coal rock sample
Preparing a cylindrical coal rock sample 47 with the height of H and the diameter of D, and ensuring that two end faces of the coal rock sample 47 are parallel and no artificial crack is generated;
(b) installing a heat shrink tube
Placing the coal rock sample 47 between the sample cushion block I16 and the sample cushion block II 55, and sleeving the heat-shrinkable tube 49 to ensure that the heat-shrinkable tube 49 completely covers the coal rock sample 47 and covers the lower part of the sample cushion block I16 and the upper part of the sample cushion block II 55; hot air is emitted by a blower to enable the heat-shrinkable sleeve 49 to shrink to tightly wrap the coal rock sample 47, the lower part of the sample cushion block I16 and the upper part of the sample cushion block II 55, and the coal rock sample 47 is sealed;
(c) installation of coal rock sample
Mounting the assembled coal rock sample 47 on a storage table 54, mounting a strain monitoring device 17 and a temperature monitoring device 48 on the coal rock sample 47, and covering a triaxial pressure chamber box body 50; positioning is carried out through the positioning pin 31, the smoothness of the oil inlet and return channel 57, the liquid inlet channel 60, the liquid return channel 61, the air inlet channel 58 and the air return channel 59 is ensured, and the triaxial pressure chamber box body 50 and the triaxial pressure chamber base 33 are fastened through the fastening screw 36;
(d) installation test device
The oil inlet and return pipeline 40 is connected with the nonpolar confining pressure oil inlet and outlet 35 and communicated with the oil inlet and return channel 57; connecting the liquid inlet pipe 30 with the liquid inlet 32, the liquid return pipe 10 with the liquid return port 9, and communicating the liquid inlet channel 60 with the liquid return channel 61; the air inlet pipe 6 is connected with the air inlet 7, the air return pipe 37 is connected with the air return port 34, and an air inlet channel 58 and an air return channel 59 are communicated; extending a microwave waveguide tube 24 into a waveguide tube interface 19 to be connected with the quartz glass 18;
(e) air tightness test
Injecting gas with certain pressure into the three-axis pressure cavity 56, closing all valves and determining that the three-axis pressure cavity 56 is complete in air tightness;
(f) loading axial pressure and confining pressure to coal rock sample
Carrying out axial pressure loading 8 on the coal rock sample 47 through the piston rod 14, and stopping the axial pressure loading when the axial pressure reaches a desired value; opening a safety valve I44, starting a circulating pump 43 and an electromagnetic valve 42, injecting nonpolar confining pressure oil into a three-axis pressure cavity to provide confining pressure for a coal rock sample 47, observing an oil pressure gauge 46, closing the circulating pump 43 and the electromagnetic valve 42 when the oil pressure is stabilized to a desired value, and closing the safety valve I44;
(g) heating coal rock sample
The heat source switch 52 is turned on, the heating power supply 53 heats the triaxial pressure chamber through the flexible heating jacket 15, the temperature of the coal rock sample 47 is monitored according to the temperature monitoring device 17, and the temperature is adjusted through the heat source switch 52;
(h) by injection of seepage liquids
Opening the liquid pump 27, the safety valve II 29 and the liquid return valve 11, injecting seepage liquid into the coal rock sample 47, observing the flow meter 12 and the liquid flow meter 26, and closing the liquid pump 27, the safety valve II 29 and the liquid return valve 11 after the flow of the seepage liquid is stable;
(i) injecting methane
Opening the gas injection valve 2, the pressure reducing valve 4 and the gas return valve 51, starting the gas pump 3 to inject methane into the coal rock sample 47, observing the gas pressure gauge 5 and the gas flowmeter 38, and continuing the next operation until the pressure and the flow are stable;
(j) microwave excitation
Turning on a microwave controller 21, providing energy by a microwave power supply 20, converting voltage by a voltage converter 22, generating microwaves by a microwave generator 23, and conducting the microwaves to a quartz glass 18 through a waveguide 24 to radiate a coal rock sample 47; adjusting the microwave controller 21 to enable the microwave generator 23 to generate microwaves with different parameters, observing the changes of the gas pressure gauge 5 and the gas flowmeter 38, and researching the influence of the microwave parameters on the permeability of the sample;
(k) end of the test
Sequentially closing the microwave controller 21, the gas injection valve 2 and the pressure reducing valve 4, opening the circulating pump 43, the electromagnetic valve 42 and the safety valve I44, pumping back the nonpolar confining pressure oil, and closing the circulating pump 43, the electromagnetic valve 42 and the safety valve I44 after the confining pressure is removed; and simultaneously removing the axial pressure, and finishing the test.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (7)
1. A multiphase medium seepage test device under the action of microwave excitation is characterized in that: the device comprises a triaxial pressure chamber, a hydraulic control system, a microwave excitation system, a temperature control system, a gas injection system and a water injection system;
the three-axis pressure chamber comprises a three-axis pressure chamber base (33) and a three-axis pressure chamber box body (50), wherein the three-axis pressure chamber box body (50) covers the three-axis pressure chamber base (33) to form a closed three-axis pressure cavity (56); a piston hole is arranged at the top of the triaxial pressure chamber box body (50), a piston rod (14) extends into the triaxial pressure chamber (56) through the piston hole, and an object placing table (54) is arranged on the triaxial pressure chamber base (33); the bottom surface of the piston rod (14) is connected with the top surface of the coal rock sample (47) through a sample cushion block I (16), and the top surface of the object placing table (54) is connected with the bottom surface of the coal rock sample (47) through a sample cushion block II (55);
the hydraulic control system comprises a liquid storage tank (41), an oil inlet and return pipeline (40) and an oil inlet and return channel (57), wherein the oil inlet and return channel (57) is a sealed liquid channel penetrating through the triaxial pressure chamber base (33) and the object placing table (54), one end of the oil inlet and return channel (57) is communicated through the oil inlet and return pipeline (40), and the other end of the oil inlet and return channel (57) is communicated with the triaxial pressure chamber (56);
the microwave excitation system comprises a waveguide tube (24) and quartz glass (18), wherein a waveguide tube interface (19) is arranged on the side wall of a triaxial pressure chamber box body (50), the waveguide tube interface (19) corresponds to the installation position of a coal rock sample (47), the quartz glass (18) is arranged in a triaxial pressure chamber (56) and covers the waveguide tube interface (19), and the waveguide tube (24) extends into the waveguide tube interface (19) and is connected with the quartz glass (18);
the temperature control system comprises a flexible heating sleeve (15) and a temperature monitoring device (48), the flexible heating sleeve (15) is coated on the outer wall of the triaxial pressure chamber, and the temperature monitoring device (48) is used for monitoring the temperature of the coal rock sample (47);
the gas injection system comprises a gas cylinder (1), a gas inlet pipe (6), a gas inlet channel (58), a gas collecting cylinder (39), a gas return pipe (37) and a gas return channel (59); the gas inlet channel (58) is a sealed gas channel penetrating through the piston rod (14) and the sample cushion block I (16), one end of the gas inlet channel (58) is communicated with the gas cylinder (1) through the gas inlet pipe (6), and the other end of the gas inlet channel is attached to the top surface of the coal rock sample (47); the air return channel (59) is a sealed air channel penetrating through the triaxial pressure chamber base (33), the object placing table (54) and the sample cushion block II (55), one end of the air return channel (59) is communicated with the gas collecting bottle (39) through an air return pipe (37), and the other end of the air return channel is attached to the bottom surface of the coal rock sample (47);
the water injection system comprises a liquid tank (25), a liquid inlet pipe (30), a liquid inlet channel (60), a liquid storage tank (13), a liquid return pipe (10) and a liquid return channel (61); the liquid inlet channel is a sealed liquid channel penetrating through the triaxial pressure chamber base (33), the object placing table (54) and the sample cushion block II (55), one end of the liquid inlet channel (60) is communicated with the liquid tank (25) through a liquid inlet pipe (30), and the other end of the liquid inlet channel is attached to the bottom surface of the coal rock sample (47); the liquid return channel (61) is a sealed liquid channel penetrating through the piston rod (14) and the sample cushion block I (16), one end of the liquid return channel (61) is communicated with the liquid storage tank (13) through the liquid return pipe (10), and the other end of the liquid return channel is attached to the top surface of the coal rock sample (47).
2. The apparatus for testing the seepage of a multi-phase medium under the microwave excitation according to claim 1, wherein: the device is characterized by further comprising a strain monitoring device (17), wherein the strain monitoring device (17) is used for monitoring the strain of the coal rock sample (47).
3. The apparatus for testing the seepage of a multi-phase medium under the microwave excitation according to claim 1, wherein: an electromagnetic valve (42), a circulating pump (43), a safety valve I (44), a flow meter (45) and an oil pressure gauge (46) are arranged on the oil inlet and return pipeline (40).
4. The apparatus for testing the seepage of a multi-phase medium under the microwave excitation according to claim 1, wherein: the microwave excitation system further comprises a microwave power supply (20), a microwave controller (21), a voltage converter (22) and a microwave generator (23).
5. The apparatus for testing the seepage of a multi-phase medium under the microwave excitation according to claim 1, wherein: the gas inlet pipe (6) is provided with a gas injection valve (2), a gas pump (3), a pressure reducing valve (4) and a gas pressure gauge (5); the gas return pipe (37) is provided with a gas flowmeter (38) and a gas return valve (51).
6. The apparatus for testing the seepage of a multi-phase medium under the microwave excitation according to claim 1, wherein: a liquid flow meter (26), a liquid pump (27), a liquid pressure gauge (28) and a safety valve II (29) are arranged on the liquid inlet pipe (30); a liquid return valve (11) and a flowmeter (12) are arranged on the liquid return pipe (10).
7. A test method of a multiphase medium seepage test device under the action of microwave excitation is characterized by comprising the following steps: the method comprises the following steps:
(a) preparing a coal rock sample (47), and ensuring that two end faces of the coal rock sample (47) are parallel and no artificial crack is generated;
(b) placing the coal rock sample (47) between the sample cushion block I (16) and the sample cushion block II (55), and sleeving a heat-shrinkable tube (49) on the sample cushion block I and the sample cushion block II so that the heat-shrinkable tube (49) completely covers the coal rock sample (47) and covers the lower part of the sample cushion block I (16) and the upper part of the sample cushion block II (55); hot air is emitted by a blower to enable a heat-shrinkable sleeve (49) to shrink to tightly wrap the coal rock sample (47), the lower part of the sample cushion block I (16) and the upper part of the sample cushion block II (55), and the coal rock sample (47) is sealed;
(c) the assembled coal rock sample (47) is arranged on a storage table (54), a strain monitoring device (17) and a temperature monitoring device (48) are arranged on the coal rock sample (47), and a triaxial pressure chamber box body (50) is covered; positioning is carried out through a positioning pin (31), so that smoothness of an oil inlet and return channel (57), a liquid inlet channel (60), a liquid return channel (61), an air inlet channel (58) and an air return channel (59) is ensured, and a triaxial pressure chamber box body (50) and a triaxial pressure chamber base (33) are fastened by using a fastening screw (36);
(d) the oil inlet and return pipeline (40) is connected with the nonpolar confining pressure oil inlet and outlet (35) and communicated with the oil inlet and return channel (57); a liquid inlet pipe (30) is connected with a liquid inlet (32), a liquid return pipe (10) is connected with a liquid return port (9), and a liquid inlet channel (60) is communicated with a liquid return channel (61); an air inlet pipe (6) is connected with an air inlet (7), an air return pipe (37) is connected with an air return port (34), and an air inlet channel (58) and an air return channel (59) are communicated; extending a microwave waveguide tube (24) into a waveguide tube interface (19) to be connected with quartz glass (18);
(e) injecting gas with certain pressure into the three-axis pressure cavity (56), closing all valves and determining that the three-axis pressure cavity (56) is complete in air tightness;
(f) axial pressure loading (8) is carried out on the coal rock sample (47) through a piston rod (14), and the axial pressure loading is stopped when the axial pressure reaches a desired value; opening a safety valve I (44), starting a circulating pump (43) and an electromagnetic valve (42), injecting nonpolar confining pressure oil into a three-axis pressure cavity (56) to provide confining pressure for a coal rock sample (47), observing an oil pressure gauge (46), closing the circulating pump (43) and the electromagnetic valve (42) when the oil pressure is stabilized to a desired value, and closing the safety valve I (44);
(g) a heat source switch (52) is turned on, a heating power supply (53) heats the triaxial pressure chamber through a flexible heating sleeve (15), the temperature of the coal rock sample (47) is monitored according to a temperature monitoring device (48), and the temperature is adjusted through the heat source switch (52);
(h) opening a liquid pump (27), a safety valve II (29) and a liquid return valve (11), injecting seepage liquid into the coal rock sample (47), observing a flow meter (12) and a liquid flow meter (26), and closing the liquid pump (27), the safety valve II (29) and the liquid return valve (11) after the flow of the seepage liquid is stable;
(i) opening a gas injection valve (2), a pressure reducing valve (4) and a gas return valve (51), starting a gas pump (3) to inject methane into the coal rock sample (47), observing a gas pressure gauge (5) and a gas flowmeter (38), and continuing the next operation until the pressure and the flow are stable;
(j) turning on a microwave controller (21), supplying energy by a microwave power supply (20), converting voltage by a voltage converter (22), generating microwaves by a microwave generator (23) and conducting the microwaves to quartz glass (18) through a waveguide tube (24) to radiate a coal rock sample (47); adjusting a microwave controller (21) to enable a microwave generator (23) to generate microwaves with different parameters, observing the changes of a gas pressure gauge (5) and a gas flowmeter (38), and researching the influence of the microwave parameters on the permeability of the sample;
(k) sequentially closing the microwave controller (21), the gas injection valve (2) and the pressure reducing valve (4), opening the circulating pump (43), the electromagnetic valve (42) and the safety valve I (44), pumping back the nonpolar confining pressure oil, and closing the circulating pump (43), the electromagnetic valve (42) and the safety valve I (44) after the confining pressure is removed; and simultaneously removing the axial pressure, and finishing the test.
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