CN110529107B - Comprehensive testing device and method for coal seam strain, seepage, displacement and jet flow - Google Patents
Comprehensive testing device and method for coal seam strain, seepage, displacement and jet flow Download PDFInfo
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- CN110529107B CN110529107B CN201910824250.XA CN201910824250A CN110529107B CN 110529107 B CN110529107 B CN 110529107B CN 201910824250 A CN201910824250 A CN 201910824250A CN 110529107 B CN110529107 B CN 110529107B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
The invention discloses a comprehensive testing device for coal bed strain, seepage, displacement and jet flow, which comprises a coal chamber, a vibrator, an ultrasonic generator, a methane gas source, a seepage displacement gas source, a hand pump, a resistivity tester, a gas storage tank, a gas control valve, a blasting sheet assembly, a release cylinder, a pressure sensor, a high-pressure valve, a drying agent, a gas flowmeter, a strain measurement sealed container and a strain gauge. Meanwhile, the invention also provides a comprehensive test method for coal bed strain, seepage, displacement and jet, which comprises equipment leakage test, high-pressure gas seepage test, high-pressure gas displacement test, high-pressure gas jet test, resistivity measurement test and high-pressure strain measurement. The device is used for the test of successfully fracturing the coal sample after gas permeation of the coal core, and can also be used for the gas displacement test of the coal sample, the resistivity measurement of the coal core under high pressure and gas permeation and the high-pressure strain measurement of the coal bed, so that the test result is closer to the real condition.
Description
Technical Field
The invention belongs to a comprehensive test device and a comprehensive test method for a coal sample, which are used for performing a test of successfully fracturing the coal sample after gas permeates the coal core, and simultaneously performing a gas displacement test of the coal sample, resistivity measurement of the coal core under high pressure and gas permeation and high-pressure strain measurement of a coal bed, so that a test result is closer to a real condition.
Background
Gas seepage refers to the flow of gas in a porous medium. The fundamental difference between gas seepage and liquid seepage is that gas has large compressibility, and the volume changes with temperature, pressure and the like in the seepage process. Gas jet refers to the flow of gas emitted from a nozzle, orifice, slit. For coal seam mining, the coal seam is in the underground layer and can not be prevented from gas seepage such as gas, coal seam mining is usually carried out by gas jet fracturing, or gas displacement is carried out before mining, so that methane gas is convenient to extract, and therefore a gas seepage test, gas jet, gas displacement, coal seam strain and resistivity measurement are necessary to guide the safe and efficient mining of the coal seam.
At present, in a laboratory, a test piece box is commonly used for simulating seepage tests of various gases in a coal sample, but the test conditions of the existing test piece box are relatively limited, so that the underground real conditions of the coal sample under the influences of factors such as different pressures, different temperatures and underground waves cannot be truly simulated. Meanwhile, the gas seepage test and the gas jet flow test are independently carried out, so that resource waste is caused.
Disclosure of Invention
Aiming at the limitations of the existing test piece box for simulating the seepage test of various gases in a coal sample and the defects that the gas seepage test and the jet test are carried out independently to waste resources, the invention provides the comprehensive test device for coal bed strain, seepage, displacement and jet, which can more truly simulate the gas seepage condition of the coal sample under the underground real conditions of different pressures, different temperatures, underground waves and the like, and can simultaneously carry out the gas jet test, the gas displacement test, the strain measurement and the resistivity measurement so as to save resources.
Therefore, the technical scheme adopted by the invention is as follows: a coal bed strain, seepage, displacement and jet flow comprehensive test device comprises a coal bed chamber, a vibrator, an ultrasonic generator, a methane gas source, a seepage displacement gas source, a hand pump, a resistivity determinator, a gas storage tank, a gas control valve, a blasting sheet assembly, a release cylinder and a strain measurement sealing container, wherein the methane gas source and the seepage displacement gas source are connected in parallel to the left side of the coal bed chamber through gas inlet pipelines and can respectively provide methane gas and seepage displacement gas for a coal bed chamber of the coal bed chamber; the device comprises a vibrator, an ultrasonic generator, a hand pump, a resistivity tester, an air storage tank, a high-pressure valve, an air release valve, a pneumatic control valve, a blasting sheet assembly and a release cylinder, wherein the vibrator is arranged at the left end of a coal chamber and provides vibration for the coal chamber; the seepage displacement gas source can inject gas into the strain measurement sealed container through a pipeline, the strain measurement sealed container is used for containing a coal sample with a strain gauge attached to the outer surface and is connected with a strain gauge through a strain gauge interface to read strain parameters of the coal sample, the strain measurement sealed container is provided with a high-pressure valve and an emptying valve, and an inner cavity and a coal core cavity of the strain measurement sealed container are cylindrical and have the same diameter.
Preferably, the coal core chamber comprises a circular steel cylinder, a circumferential pressure transmission sleeve, T-shaped seal heads, PEEK sleeves, a conical steel sleeve, a right piston sleeve, a right first pressing sleeve, a right second pressing sleeve, a left first pressing sleeve and a left second pressing sleeve, wherein the circumferential pressure transmission sleeve is arranged in the circular steel cylinder, the outer diameter of the circumferential pressure transmission sleeve is smaller than the inner diameter of the circular steel cylinder, the two T-shaped seal heads are oppositely arranged in the circumferential pressure transmission sleeve at intervals left and right, one PEEK sleeve is sleeved on each rod part of each T-shaped seal head, the diameters of the left end part and the right end part of the circumferential pressure transmission sleeve are increased, the PEEK sleeves are tightly abutted and sealed through a conical steel sleeve combined sealing ring, and therefore a cylindrical coal core cavity is formed between the circumferential pressure transmission sleeve and the two T-shaped seal heads, and a circumferential pressure applying cavity is formed between the circumferential pressure transmission sleeve and the circular; the left first pressing sleeve is screwed at the left end of the round steel cylinder and abuts against the left conical steel sleeve, and the front end of the left second pressing sleeve is screwed in the left first pressing sleeve and abuts against the left PEEK sleeve through a circumferential cushion block; the right first pressing sleeve is in threaded connection with the right end of the round steel cylinder and abuts against the conical steel sleeve on the right side, the right second pressing sleeve is fixedly arranged behind the right first pressing sleeve, the right piston sleeve penetrates through the right second pressing sleeve and the right first pressing sleeve and abuts against the PEEK sleeve on the right side, the middle of the right piston sleeve is provided with an annular bulge and can slide left and right in the large inner diameter section of the right second pressing sleeve, and the interface of the large inner diameter section and the small inner diameter section of the right second pressing sleeve is used as a right movement termination limiting surface of the right piston sleeve; the lateral wall of the round steel cylinder is provided with two annular high-pressure liquid interfaces and is connected with a hand pump through a pipeline, the lateral wall of the right second pressing sleeve is provided with two axial high-pressure liquid interfaces and is connected with the hand pump through a pipeline, and two T-shaped sealing heads are respectively provided with a seepage high-pressure gas and a PEEK insulation joint shared interface of a resistivity determinator. The circumferential pressure of the coal sample in the coal chamber is detected through the circumferential pressure sensor, the axial pressure sensor is used for measuring the axial pressure of the coal sample in the coal chamber, and the position of the pressure acquisition point can ensure that the acquired data is true and reasonable.
Preferably, the side wall of the round steel cylinder is provided with an annular pressure sensor mounting hole, the side wall of the right second pressing sleeve is provided with an axial pressure sensor mounting hole, and the axial pressure sensor mounting hole and the axial high-pressure liquid interface are respectively positioned on the left side and the right side of the annular bulge; the middle part of the outer side wall of the round steel cylinder is partially flattened to be used as an installation platform of the ultrasonic generator, and the vibrator is connected to the inlet of the left end of the coal chamber.
Preferably, the high-pressure seepage gas pipe and the high-pressure liquid pipe which are connected with the coal core chamber are flexible pipes, and the coal core chamber is placed in a warm water bath. The water temperature can be adjusted according to the conditions, and gas seepage tests at different temperatures can be carried out.
Further preferably, the rupture disk assembly comprises a rupture disk, a rupture disk mounting male head, a rupture disk mounting female head and a rupture disk gasket, the rupture disk and the rupture disk gasket are superposed and then pressed tightly in the rupture disk mounting male head and the rupture disk mounting female head through threaded connection, and a sealing ring is further arranged between the rupture disk mounting male head and the rupture disk mounting female head. By adopting the newly designed simple blasting sheet assembly, the test cost is greatly reduced.
Meanwhile, the invention also provides a comprehensive test method for coal bed strain, seepage, displacement and jet, which comprises the comprehensive test device for coal bed strain, seepage, displacement and jet, and comprises the following steps:
step one, equipment leakage test
Putting a simulated coal core into a coal core cavity of a coal core chamber, respectively sealing a left-end air inlet and a right-end air outlet by using dead plugs, assembling each pipeline and a joint, using water as a medium, and using a hand pump to apply annular pressure and axial pressure to the coal core chamber to 1-2 MPa for 2 hours, and observing whether each high-pressure joint and the pipeline of the equipment have leakage or not, wherein the reading of a pressure gauge is kept unchanged;
step two, high-pressure gas seepage test
Placing the simulated coal core into a coal core cavity of a coal core chamber, assembling all pipelines and joints, applying annular pressure and axial pressure to the coal core chamber by using a hand-operated pump, opening a methane gas source, and injecting a certain amount of methane gas into the coal core cavity;
closing a methane gas source, opening a seepage displacement gas source, continuously injecting seepage displacement high-pressure gas into the coal core cavity, performing a seepage test, and recording the seepage conditions of the high-pressure gas under different vibration frequencies, ultrasonic waves, annular pressure, tangential pressure, temperatures and air pressures in the test process;
step three, high-pressure gas displacement test
Opening a high-pressure valve on an exhaust pipeline, continuously injecting seepage displacement high-pressure gas into a coal core cavity, drying methane gas mixed with part of seepage displacement gas by a drying agent, flowing through a gas flowmeter, reading the amount of the displaced methane gas by the gas flowmeter, and recording gas displacement conditions of different vibration frequencies, ultrasonic waves, annular pressure, tangential pressure, temperature and gas pressure in the test process;
step four, high-pressure gas jet test
Closing a high-pressure valve in front of the drying agent, opening a pneumatic control valve, continuously collecting high-pressure gas in the coal chamber into a gas storage tank until the gas pressure of the gas storage tank is greater than the blasting pressure of the blasting sheet assembly, and spraying the high-pressure gas out of a release cylinder to crack a coal sample;
after the test is finished, closing the seepage displacement air source, emptying the air storage tank, and slowly reducing the annular pressure and the axial pressure until the annular pressure and the axial pressure are zero;
step five, resistivity determination test
Replacing a high-pressure gas inlet and outlet joint of a coal core chamber with a PEEK insulating joint of a resistivity tester, firstly adding annular pressure and axial pressure, then opening a seepage displacement gas source, and after a simulated coal core of the coal core chamber is completely soaked, measuring and recording the resistivity of the coal core under high pressure and gas seepage; after the test is finished, closing the seepage displacement air source, and slowly reducing the annular pressure and the axial pressure until the annular pressure and the axial pressure are zero;
step six, high-pressure strain measurement
Attaching a strain gauge to the outer surface of the simulated coal core, placing the simulated coal core into a strain measurement sealed container, opening a seepage displacement gas source to charge high-pressure gas into the strain measurement sealed container, and reading strain values under different pressures through a strain gauge; and after the test is finished, closing the seepage displacement gas source, and emptying the strain measurement sealed container.
The invention has the beneficial effects that:
(1) the test device can simulate the gas seepage and displacement conditions of the coal sample under underground real conditions of different pressures, different temperatures, underground waves and the like more truly, so that the test result has higher practical guiding significance, and reliable guarantee is provided for safe and efficient exploitation of the coal bed.
(2) An ultrasonic generator is additionally arranged, high-pressure gas seepage tests under different sound wave conditions can be carried out, and the influence of the gas seepage on the coal sample micro cracks under the ultrasonic wave conditions is simulated; the method is characterized in that a vibrator is additionally arranged, air is used as a power source, the influence of gas seepage on the macroscopic cracks of the coal sample under different underground wave conditions is simulated, transverse waves generated by the vibrator are large in amplitude, for example, about 10HZ, and the vibrator is used for simulating the macroscopic cracks of the underground waves on the coal sample; the arrangement positions of the ultrasonic generator and the vibrator are optimized to simulate the coupling action in two directions, so that the test result is closer to the underground real condition.
(3) The method can be used for not only carrying out a test of successfully fracturing the coal sample after gas permeates the coal core, but also carrying out a gas displacement effect test, a coal bed strain test and resistivity measurement of the coal core under high pressure and gas permeation; the gas after the gas seepage test constantly gathers in the gas holder, when pressure exceeded rupture disk subassembly internal rupture disk pressure, rupture disk, gas send out the instant coal sample that becomes cracked through the release section of thick bamboo, and the gas holder collects the high-pressure gas of seepage test and in time carries out the efflux test simultaneously, has effectively practiced thrift the energy.
(4) One test platform can complete various experiments, and an air source is effectively utilized in the experiments, so that energy waste is avoided; through reasonable configuration on the test steps, the test time is saved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention
Fig. 2 is a schematic connection diagram of the present invention.
Fig. 3 is a schematic structural diagram of a coal chamber.
Fig. 4 is a schematic view of the construction of a rupture disc assembly.
Detailed Description
The invention will be further illustrated by the following examples in conjunction with the accompanying drawings:
referring to fig. 1-3, the comprehensive testing device for coal seam strain, seepage, displacement and jet flow mainly comprises a coal core chamber, a support leg 13, a pressure sensor 14, a high-pressure valve 15, an air release valve 16, a drying agent 17, a gas flow meter 18, a vibrator 19, an ultrasonic generator 20, a methane gas source 21, a seepage displacement gas source 22, a hand pump 23, a resistivity tester 24, a gas storage tank 25, a gas control valve 26, a rupture disk assembly 27, a release cylinder 28, a strain measurement sealed container 29 and a strain gauge 30.
The coal core chamber mainly comprises a round steel cylinder 1, an annular pressure transmission sleeve 2, a T-shaped seal head 3, a PEEK sleeve 4, a conical steel sleeve 5, a right piston sleeve 6, a right first pressing sleeve 7, a right second pressing sleeve 8, a left first pressing sleeve 9, a left second pressing sleeve 10, an annular cushion block 11 and a sealing ring 12.
The annular pressure transmission sleeve 2 is arranged in the round steel cylinder 1, and the outer diameter of the annular pressure transmission sleeve 2 is smaller than the inner diameter of the round steel cylinder 1. Two T type head 3 are installed in annular pressure transmission cover 2 about the interval ground relatively, and the big head end of two T type head 3 is relative, and every T type head 3's pole portion respectively overlaps and is equipped with a PEEK cover 4. The diameters of the left end part and the right end part of the annular pressure transmission sleeve 2 are increased and are tightly abutted and sealed by combining the conical steel sleeve 5 with the sealing ring 12, so that a cylindrical coal core cavity A is formed between the annular pressure transmission sleeve 2 and the two T-shaped seal heads 3, and an annular pressure applying cavity B is formed between the annular pressure transmission sleeve 2 and the round steel cylinder 1. The coal core cavity A and the hoop pressure applying cavity B are sealed cavities, the coal core cavity A is used for placing a cylindrical coal sample, the hoop pressure applying cavity B is used for applying hoop pressure to the coal sample, and the hoop pressure transmission sleeve 2 is made of rubber and can deform and apply pressure.
The left first pressing sleeve 9 is screwed at the left end of the round steel cylinder 1 and abuts against the left conical steel sleeve 5, and the front end of the left second pressing sleeve 10 is screwed in the left first pressing sleeve 9 and abuts against the left PEEK sleeve 4 through the annular cushion block 11.
The right first pressing sleeve 7 is in threaded connection with the right end of the round steel cylinder 1 and abuts against the conical steel sleeve 5 on the right side, the right second pressing sleeve 8 is fixedly arranged behind the right first pressing sleeve 7, and the right piston sleeve 6 penetrates through the right second pressing sleeve 8 and the right first pressing sleeve 7 and abuts against the PEEK sleeve 4 on the right side. The right second pressing sleeve 8 is divided into a large inner diameter section and a small inner diameter section, the middle part of the right piston sleeve 6 is provided with a circumferential bulge 6a and can slide left and right in the large inner diameter section of the right second pressing sleeve 8, the interface of the large inner diameter section and the small inner diameter section of the right second pressing sleeve 8 is used as a right movement stop limiting surface of the right piston sleeve 6, and the right piston sleeve 6 moves right until the right piston sleeve abuts against the interface of the large inner diameter section and the small inner diameter section.
Be provided with two rings direction high pressure liquid interface an on the lateral wall of a steel cylinder 1 and link to each other with hand pump 23 through the pipeline, two rings direction high pressure liquid interface an advance one and go out for apply chamber B to the ring pressure and pour into high pressure liquid into, and apply ring pressure to the coal sample through ring pressure transmission cover 2, also be used for before the experiment water injection detection test equipment whether have the leakage. Two axial high-pressure liquid interfaces b (one of which is not shown) are arranged on the side wall of the right second pressing sleeve 8 and are connected with the hand pump 23 through a pipeline, and the two axial high-pressure liquid interfaces b are arranged in and out one by one and are used for injecting high-pressure liquid into the small inner diameter section of the right second pressing sleeve 8 and applying axial pressure to the coal sample through the right piston sleeve 6. The two T-shaped end sockets 3 are respectively provided with a seepage high-pressure gas and resistivity tester PEEK insulating joint shared interface d which can be used as a socket of the resistivity tester PEEK insulating joint and a socket of seepage high-pressure gas, a seepage gas test is firstly carried out, the socket of the high-pressure gas is taken down after the seepage gas test is finished, the resistivity tester PEEK insulating joint is mounted, and the resistivity can be tested. The resistivity tester can select a product brand 'Tonghui', a model number TH2810D, 4 PEEK insulating joints are matched, wherein 2 PEEK insulating joints are spare, and the testing capability under a high-voltage state is met.
The side wall of the round steel cylinder 1 is provided with a circumferential pressure sensor mounting hole c; an axial pressure sensor mounting hole d is formed in the side wall of the right second pressing sleeve 8, and the axial pressure sensor mounting hole d and the axial high-pressure liquid interface b are located on the left side and the right side of the annular protrusion 6a respectively. The middle part of the outer side wall of the round steel cylinder 1 is partially cut flat to be used as a mounting platform of an ultrasonic generator 20, and a vibrator 19 is connected to the inlet of the left end of the coal chamber. A support leg 13 is arranged below the round steel cylinder 1.
The methane gas source 21 and the seepage displacement gas source 22 are connected in parallel to the left side of the coal core chamber through the gas inlet pipeline and can respectively provide methane gas and seepage displacement gas (such as carbon dioxide gas) for the coal core cavity A of the coal core chamber, and the methane gas source 21 and the seepage displacement gas source 22 are respectively provided with a high-pressure valve 15 and share one pressure sensor 14. When the methane gas needs to be supplied to the core cavity A of the core chamber, the high-pressure valve 15 on the pipeline of the methane gas source 21 is opened, and the high-pressure valve 15 on the pipeline of the seepage displacement gas source 22 is closed. When seepage displacement gas needs to be supplied to the core cavity A of the core chamber, the high-pressure valve 15 on the pipeline of the seepage displacement gas source 22 is opened, and the high-pressure valve 15 on the pipeline of the methane gas source 21 is closed.
The right side of the coal chamber is connected with a pressure sensor 14, a high-pressure valve 15, a drying agent 17 and a gas flowmeter 18 in sequence through an exhaust pipeline. When a gas displacement test needs to be carried out, the seepage displacement gas source 22 is opened, the high-pressure valve 15 on the gas storage tank 25 is closed, gas is prevented from entering the gas storage tank 25, displaced methane gas can only pass through the drying agent 17 and the gas flowmeter 18, and the pressure sensor 14 and the gas flowmeter 18 are additionally arranged, so that the gas displacement effect under different pressures can be measured. The drying agent 17 is additionally arranged, and the drying agent is used for adsorbing moisture in the mixed gas, so that the accuracy of the ratio measurement of the mixed gas is improved. After the seepage test or the displacement test is finished, the high-pressure valve 15 on the exhaust pipeline is closed, and high-pressure gas is gathered into the gas storage tank 25 for subsequent jet flow tests.
The vibrator 19 is installed at the left end of a coal core chamber to provide vibration for the coal core chamber, the ultrasonic generator 20 is installed on the coal core chamber to provide ultrasonic waves for the coal core chamber, the hand pump 23 provides annular pressure and axial pressure for the coal core chamber, the resistivity determinator 24 is used for measuring the resistivity of a coal sample of the coal core chamber under high pressure and gas seepage, the gas storage tank 25 is connected in front of the pressure sensor 14 of the exhaust pipeline through a pipeline, the gas storage tank 25 is provided with the high-pressure valve 15 and the emptying valve 16, and a gas control valve 26, a rupture disk assembly 27 and a release cylinder 28 are sequentially connected between the pressure sensor 14 and the high-pressure valve 15 of the exhaust pipeline through pipelines.
The seepage high-pressure gas pipe and the high-pressure liquid pipe which are connected with the coal core chamber are both flexible pipes, and the coal core chamber is arranged in a warm water bath to provide proper environment temperature. And the release cylinder 28 is inserted into the coal sample, the high-pressure valve 15 on the gas storage tank 25 is opened, a high-pressure gas jet flow cracking test is carried out, and if the bursting pressure of the bursting disc is 30MPA, the bursting disc is damaged when the outlet pressure of the gas storage tank 25 exceeds 30MPA, and the coal sample test piece can be cracked instantly under the pressure of 30 MPA.
As shown in fig. 3, the rupture disk assembly 27 is composed of a rupture disk 27a, a rupture disk mounting male head 27b, a rupture disk mounting female head 27c, and a rupture disk gasket 27 d. The rupture disk 27a and the rupture disk gasket 27d are overlapped and then are tightly pressed in the rupture disk mounting male head 27b and the rupture disk mounting female head 27c through screw threads, and a sealing ring 12 is further arranged between the rupture disk mounting male head 27b and the rupture disk mounting female head 27 c.
The seepage displacement gas source 22 can inject gas into the strain measurement sealed container 29 through a pipeline, the strain measurement sealed container 29 is used for containing a coal sample with a strain gauge attached to the outer surface and is connected with the strain gauge 30 through a strain gauge interface 29a to read strain parameters of the coal sample, the strain measurement sealed container 29 is provided with a high-pressure valve 15 and an emptying valve 16, and the inner cavity of the strain measurement sealed container 29 and the coal core cavity A are cylindrical and have the same diameter.
The seepage test can adopt four gases of methane, nitrogen, carbon dioxide or hydrogen sulfide; the jet test uses carbon dioxide gas.
The comprehensive testing method for coal bed strain, seepage, displacement and jet flow by using the comprehensive testing device for coal bed strain, seepage, displacement and jet flow comprises the following steps:
step one, equipment leakage test
The simulated coal core is placed in a coal core cavity A of a coal core chamber, a left end air inlet and a right end air outlet are sealed by dead plugs respectively, all pipelines and joints are assembled, water is used as a medium, a hand pump is used for supplying circumferential pressure and axial pressure to the coal core chamber to reach 1-2 MPa, the duration is 2 hours, whether all high-pressure joints and pipelines of the equipment leak or not is observed, and the reading of a pressure gauge is kept unchanged.
Step two, high-pressure gas seepage test
The simulated coal core is placed in a coal core cavity A of a coal core chamber, all pipelines and joints are assembled, a hand-operated pump is used for applying annular pressure and axial pressure to the coal core chamber, for example, 60Mpa is used, a methane gas source 21 is opened, and a certain amount of methane gas is injected into the coal core cavity A.
And (3) closing the methane gas source 21, opening the seepage displacement gas source 22, continuously injecting seepage displacement high-pressure gas, such as 60Mpa, into the coal core cavity A, performing a seepage test, and recording the seepage conditions of the high-pressure gas under different vibration frequencies, ultrasonic waves, annular pressure, tangential pressure, temperatures and air pressures in the test process.
Step three, high-pressure gas displacement test
Opening a high-pressure valve 15 on the exhaust pipeline, continuously injecting seepage displacement high-pressure gas into the coal core cavity A, drying methane gas mixed with part of seepage displacement gas by a drying agent 17, then flowing through a gas flowmeter 18, reading the displaced methane gas quantity by the gas flowmeter 18, and recording the gas displacement conditions of different vibration frequencies, ultrasonic waves, annular pressure, tangential pressure, temperature and gas pressure in the test process.
Step four, high-pressure gas jet test
The high-pressure valve 15 in front of the drying agent 17 is closed, the pneumatic control valve 26 is opened, so that the high-pressure gas in the coal chamber is continuously gathered in the gas storage tank 25 until the gas pressure of the gas storage tank 25 is greater than the blasting pressure of the blasting sheet assembly 27, and the high-pressure gas is sprayed out of the release cylinder 28 to crack the coal sample.
After the test is finished, the seepage displacement air source 22 is closed, the air storage tank 25 is emptied, and the annular pressure and the axial pressure are slowly reduced until the pressure is zero.
Step five, resistivity determination test
Replacing a high-pressure gas inlet and outlet joint of the coal core chamber with a PEEK insulating joint of a resistivity tester, firstly adding annular pressure and axial pressure, then opening a seepage displacement gas source 22, and after the simulated coal core of the coal core chamber is completely soaked, measuring and recording the resistivity of the coal core under high pressure and gas seepage; after the test is finished, the seepage displacement air source 22 is closed, and the annular pressure and the axial pressure are slowly reduced until the annular pressure and the axial pressure are zero.
Step six, high-pressure strain measurement
Attaching a strain gauge to the outer surface of the simulated coal core, placing the simulated coal core into a strain measurement sealed container 29, opening a seepage displacement gas source 22 to charge high-pressure gas into the strain measurement sealed container 29, and reading strain values under different pressures through a strain gauge 30; after the test is finished, the seepage displacement gas source 22 is closed, and the strain measurement sealed container 29 is emptied.
Claims (5)
1. The utility model provides a coal seam is met an emergency, is oozed flow, is displaced and efflux combined test device which characterized in that: comprises a coal chamber, a vibrator (19), an ultrasonic generator (20), a methane gas source (21), a seepage displacement gas source (22), a hand pump (23), a resistivity determinator (24), a gas storage tank (25), a gas control valve (26), a rupture disk assembly (27), a release cylinder (28) and a strain measurement sealed container (29), the methane gas source (21) and the seepage displacement gas source (22) are connected in parallel at the left side of the coal core chamber through an air inlet pipeline, the methane gas and the seepage displacement gas can be respectively provided for a coal core cavity (A) of the coal core chamber, a methane gas source (21) and a seepage displacement gas source (22) are respectively provided with a high-pressure valve (15) and share one pressure sensor (14), and the right side of the coal core chamber is sequentially connected with the pressure sensor (14), the high-pressure valve (15), a drying agent (17) and a gas flowmeter (18) through an exhaust pipeline; the device comprises a vibrator (19), an ultrasonic generator (20), a hand pump (23), a resistivity measuring instrument (24), a gas storage tank (25), a high-pressure valve (15) and an emptying valve (16), wherein the vibrator (19) is arranged at the left end of a coal chamber to provide vibration for the coal chamber, the ultrasonic generator (20) is arranged on the coal chamber to provide ultrasonic waves for the coal chamber, the hand pump (23) is used for providing annular pressure and axial pressure for the coal chamber, the resistivity measuring instrument (24) is used for measuring the resistivity of a coal sample of the coal chamber under high pressure and gas seepage, the gas storage tank (25) is connected in front of the pressure sensor (14) of the exhaust pipeline through a pipeline, the gas storage tank (25) is provided with the high-pressure valve (15) and the emptying valve (16), and the gas control valve (26; the seepage displacement gas source (22) can inject gas into the strain measurement sealed container (29) through a pipeline, the strain measurement sealed container (29) is used for containing a coal sample with a strain gauge attached to the outer surface, and is connected with the strain gauge (30) through a strain gauge interface (29 a) to read strain parameters of the coal sample, the strain measurement sealed container (29) is provided with a high-pressure valve (15) and an air release valve (16), and the inner cavity of the strain measurement sealed container (29) and the coal core cavity (A) are cylindrical and have the same diameter;
the coal core chamber comprises a round steel cylinder (1), a circumferential pressure transmission sleeve (2), T-shaped seal heads (3), a PEEK sleeve (4), a conical steel sleeve (5), a right piston sleeve (6), a right first pressure sleeve (7), a right second pressure sleeve (8), a left first pressure sleeve (9) and a left second pressure sleeve (10), wherein the circumferential pressure transmission sleeve (2) is arranged in the round steel cylinder (1), the outer diameter of the circumferential pressure transmission sleeve (2) is smaller than the inner diameter of the round steel cylinder (1), the two T-shaped seal heads (3) are oppositely arranged in the circumferential pressure transmission sleeve (2) at left and right intervals, the rod part of each T-shaped seal head (3) is sleeved with one PEEK sleeve (4), the diameters of the left and right end parts of the circumferential pressure transmission sleeve (2) are increased and are combined with a sealing ring (12) through the conical steel sleeve (5) to be tightly sealed, and a cylindrical coal core chamber (A) is formed between the circumferential pressure transmission sleeve (2) and the two T-shaped seal heads (3), an annular pressure applying cavity (B) is formed between the annular pressure transmitting sleeve (2) and the round steel cylinder (1); the left first pressing sleeve (9) is screwed at the left end of the round steel cylinder (1) and abuts against the left conical steel sleeve (5), and the front end of the left second pressing sleeve (10) is screwed in the left first pressing sleeve (9) and abuts against the left PEEK sleeve (4) through a circumferential cushion block (11); the right first pressing sleeve (7) is in threaded connection with the right end of the round steel cylinder (1) and abuts against the conical steel sleeve (5) on the right side, the right second pressing sleeve (8) is fixedly arranged behind the right first pressing sleeve (7), the right piston sleeve (6) penetrates through the right second pressing sleeve (8) and the right first pressing sleeve (7) and abuts against the PEEK sleeve (4) on the right side, the middle part of the right piston sleeve (6) is provided with a circumferential protrusion (6 a) and can slide left and right in the large inner diameter section of the right second pressing sleeve (8), and the interface of the large inner diameter section of the right second pressing sleeve (8) serves as a right movement stopping limiting surface of the right piston sleeve (6);
the high-pressure circular steel cylinder is characterized in that two annular high-pressure liquid interfaces (a) are arranged on the side wall of the circular steel cylinder (1) and are connected with a hand pump (23) through a pipeline, two axial high-pressure liquid interfaces (b) are arranged on the side wall of the right second pressing sleeve (8) and are connected with the hand pump (23) through a pipeline, and two seepage high-pressure gas and a PEEK insulating joint shared interface (d) of a resistivity tester are arranged on the two T-shaped seal heads (3).
2. The coal seam strain, seepage, displacement and jet flow comprehensive test device according to claim 1, characterized in that: a circumferential pressure sensor mounting hole (c) is formed in the side wall of the round steel cylinder (1), an axial pressure sensor mounting hole (d) is formed in the side wall of the right second pressing sleeve (8), and the axial pressure sensor mounting hole (d) and the axial high-pressure liquid interface (b) are respectively located on the left side and the right side of the circumferential protrusion (6 a); the middle part of the outer side wall of the round steel cylinder (1) is partially flattened to be used as an installation platform of an ultrasonic generator (20), and the vibrator (19) is connected to the inlet of the left end of the coal chamber.
3. The comprehensive testing device for coal seam strain, seepage, displacement and jet flow according to claim 1 or 2, characterized in that: and the seepage high-pressure gas pipe and the high-pressure liquid pipe which are connected with the coal core chamber are both flexible pipes, and the coal core chamber is arranged in a warm water bath.
4. The coal seam strain, seepage, displacement and jet flow comprehensive test device according to claim 3, characterized in that: the rupture disk assembly (27) comprises a rupture disk (27 a), a rupture disk installation male head (27 b), a rupture disk installation female head (27 c) and a rupture disk gasket (27 d), the rupture disk (27 a) and the rupture disk gasket (27 d) are overlapped and then pressed tightly in the rupture disk installation male head (27 b), the rupture disk installation female head (27 c) through the rupture disk installation screw joint, and a sealing ring (12) is further arranged between the rupture disk installation male head (27 b) and the rupture disk installation female head (27 c).
5. A comprehensive test method for coal seam strain, seepage, displacement and jet flow is characterized in that: the comprehensive testing device for the strain, seepage, displacement and jet of the coal seam as claimed in any one of claims 1 to 4 comprises the following steps:
step one, equipment leakage test
Putting a simulated coal core into a coal core cavity (A) of a coal core chamber, respectively sealing a left-end air inlet and a right-end air outlet by using dead plugs, assembling pipelines and joints, using water as a medium, using a hand pump to supply circumferential pressure and axial pressure to the coal core chamber to 1-2 MPa for 2 hours, and observing whether the high-pressure joints and pipelines of the equipment have leakage or not, wherein the reading of a pressure gauge is kept unchanged;
step two, high-pressure gas seepage test
Putting the simulated coal core into a coal core cavity (A) of a coal core chamber, assembling all pipelines and joints, applying annular pressure and axial pressure to the coal core chamber by using a hand-operated pump, opening a methane gas source (21), and injecting a certain amount of methane gas into the coal core cavity (A);
closing a methane gas source (21), opening a seepage displacement gas source (22), continuously injecting seepage displacement high-pressure gas into the coal core cavity (A), performing a seepage test, and recording the seepage conditions of the high-pressure gas under different vibration frequencies, ultrasonic waves, annular pressure, tangential pressure, temperatures and air pressures in the test process;
step three, high-pressure gas displacement test
Opening a high-pressure valve (15) on an exhaust pipeline, continuously injecting seepage displacement high-pressure gas into the coal core cavity (A), drying methane gas mixed with part of seepage displacement gas by a drying agent (17), then flowing through a gas flowmeter (18), reading the amount of the displaced methane gas by the gas flowmeter (18), and recording the gas displacement conditions of different vibration frequencies, ultrasonic waves, annular pressure, tangential pressure, temperature and gas pressure in the test process;
step four, high-pressure gas jet test
Closing the high-pressure valve (15) in front of the drying agent (17), opening the pneumatic control valve (26) to enable high-pressure gas in the coal chamber to be continuously gathered in the gas storage tank (25) until the gas pressure of the gas storage tank (25) is greater than the blasting pressure of the blasting sheet assembly (27), and ejecting the high-pressure gas from the release cylinder (28) to crack the coal sample;
after the test is finished, closing the seepage displacement air source (22), emptying the air storage tank (25), and slowly reducing the annular pressure and the axial pressure until the annular pressure and the axial pressure are zero;
step five, resistivity determination test
Replacing a high-pressure gas inlet and outlet joint of the coal chamber with a PEEK insulating joint of a resistivity tester, firstly adding annular pressure and axial pressure, then opening a seepage displacement gas source (22), and after the simulated coal core of the coal chamber is completely soaked, measuring and recording the resistivity of the coal core under high pressure and gas seepage; after the test is finished, closing the seepage displacement air source (22), and slowly reducing the annular pressure and the axial pressure until the annular pressure and the axial pressure are zero;
step six, high-pressure strain measurement
Attaching a strain gauge to the outer surface of the simulated coal core, placing the simulated coal core into a strain measurement sealed container (29), opening a seepage displacement gas source (22) to charge high-pressure gas into the strain measurement sealed container (29), and reading strain values under different pressures through a strain gauge (30); and after the test is finished, closing the seepage displacement air source (22) and emptying the strain measurement sealed container (29).
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