CN113866065A - Deep mine gas-water mixed penetration test system and test method thereof - Google Patents
Deep mine gas-water mixed penetration test system and test method thereof Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 189
- 238000012360 testing method Methods 0.000 title claims abstract description 106
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- 238000010998 test method Methods 0.000 title claims abstract description 11
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- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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Abstract
The invention discloses a gas-water mixed penetration test system for a deep mine and a test method thereof, wherein the system comprises a penetration test unit, a data acquisition unit and a data analysis display unit; the penetration test unit comprises a penetration device, a water pump, a gas cylinder and a pressure control device; the data acquisition unit comprises a gas-water separation device, a first pressure sensor, a first flowmeter, a second pressure sensor and a second flowmeter; an exhaust pipe is arranged at the top of the gas-water separation device, a third flow meter is arranged on the exhaust pipe, a weighing support is arranged at the bottom of the gas-water separation device, and a weighing sensor is arranged on the weighing support; the data analysis display unit comprises a recorder and an upper computer. The system disclosed by the invention is reasonable in design, can be effectively applied to a gas-water mixed penetration test of a deep mine, is combined with a test method to realize a simulation test of different pressure phenomena of gas-water under the mine, is close to the actual condition of the mine, is accurate in data acquisition in real time, is remarkable in effect, and is convenient to popularize.
Description
Technical Field
The invention belongs to the technical field of deep mine gas pre-extraction, and particularly relates to a deep mine gas-water mixed penetration test system and a test method thereof.
Background
In recent years, as the mining depth of coal resources is increased year by year, coal bed gas occurrence conditions become more complicated after coal mining enters deep parts, and mining environments are changed dramatically. Because the deep rock mass bears the great vertical stress that the overburden dead weight produced and the tectonic stress that geological structure produced, finally lead to higher ground stress to produce very big karst water pressure thereupon, the ground temperature under the deep condition will also be higher and higher, promptly: high ground stress, high ground temperature and high karst water pressure. The gas pre-pumping is a main way for preventing and controlling mine gas at home and abroad, and the pre-pumping can not only reduce the gas pressure and the gas content of a outburst dangerous coal bed, but also cause the effects of coal bed shrinkage deformation, ground stress reduction, coal bed permeability coefficient increase, coal strength improvement and the like, so that the outburst danger of the coal body pumped and discharged with the gas is lost or weakened. However, the complicated hydrogeological conditions at the deep part can cause that the cracks generated in the gas extraction drilling construction process can communicate with the aquifer, the risk of water immersion of the drill hole is brought to gas extraction, the water immersion can reduce the stability of the drill hole under the softening action, the argillization action and the erosion action of water, the life cycle of the drill hole is greatly shortened, meanwhile, the water invasion can occupy the gas permeation channel of the coal body around the hole, the channel which is necessary for gas extraction around the drill hole is blocked, the gas-water mixed permeation is formed, the gas migration resistance is increased, the requirement on extraction negative pressure is improved, namely, the water not only has important influence on the permeability and the coal body stability of the coal body gas, but also participates in the coal body gas seepage process.
The permeability of the deep coal rock mass shows great difference under different conditions of water content, gas content and mining induced stress, shows obvious multi-field coupling characteristics and directly influences the gas migration in the coal bed, thereby influencing the quality of the gas extraction effect. The existing research means mainly utilizes the displacement principle to simulate and calculate the relative permeability of gas and water, the whole process simulation of gas-water mixed permeability cannot be realized, the data acquisition is single, the record of global data change is not thorough, meanwhile, the existing research objects mainly focus on raw coal and fractured coal bodies, and the research on the damaged coal bodies with high porosity and high permeability around a drill hole is slightly insufficient.
Disclosure of Invention
The invention aims to solve the technical problem that the defects in the prior art are overcome, and the deep mine gas-water mixed penetration test system is simple in structure, reasonable in design and convenient to implement, can be effectively applied to deep mine gas-water mixed penetration tests, is combined with a test method to realize simulation tests of different pressure phenomena of gas-water under a mine, is close to the actual situation of a mine, is accurate in data acquisition in real time, is remarkable in effect and is convenient to popularize.
In order to solve the technical problems, the invention adopts the technical scheme that: a gas-water mixed penetration test system for a deep mine comprises a penetration test unit, a data acquisition unit and a data analysis display unit; the penetration test unit comprises a penetration device, a water pump, a gas cylinder and a pressure control device, wherein the water pump is used for providing a water source for the penetration device; a water inlet pipe is connected between the penetration device and the water pump, a first one-way valve is arranged on the water inlet pipe, an air inlet pipe is connected between the penetration device and the air bottle, and a second one-way valve is arranged on the air inlet pipe; the data acquisition unit comprises a gas-water separation device, a first pressure sensor and a first flowmeter which are arranged on the water inlet pipe, and a second pressure sensor and a second flowmeter which are arranged on the air inlet pipe; a water-gas discharge pipe is connected between the gas-water separation device and the permeation device, a third one-way valve is arranged on the water-gas discharge pipe, an exhaust pipe is arranged at the top of the gas-water separation device, a third flow meter and a fourth one-way valve are arranged on the exhaust pipe, a drain valve is arranged on the side surface of the gas-water separation device, a weighing support is arranged at the bottom of the gas-water separation device, and a weighing sensor is arranged on the weighing support; the data analysis display unit comprises a recorder and an upper computer connected with the recorder, and the first pressure sensor, the second pressure sensor, the first flowmeter, the second flowmeter, the third flowmeter and the weighing sensor are all connected with the input end of the recorder.
The gas-water mixed penetration test system for the deep mine comprises a base and a cylinder barrel arranged at the upper part of the base, a water flow channel and an air flow channel are arranged in the base, the water inlet pipe is in threaded connection with the water flow channel, the air inlet pipe is in threaded connection with the airflow channel, a first permeable plate positioned above the water flow channel and the airflow channel is arranged at the joint of the base and the cylinder barrel, the cylinder barrel is used for placing a sample, the upper part of the cylinder barrel is provided with a piston body positioned above the sample, a second porous plate is arranged between the piston body and the sample, a water-gas channel is arranged in the piston body, the water vapor discharge pipe is in threaded connection with the water vapor channel, a plurality of bolts are connected between the base and the cylinder barrel, a first sealing ring is arranged between the base and the cylinder barrel, and a second sealing ring and a third sealing ring are arranged between the piston body and the cylinder barrel.
In the gas-water mixed penetration test system for the deep mine, the first water permeable plate is provided with a plurality of water passing holes communicated with the water flow channel and a plurality of air passing holes communicated with the air flow channel, and the water passing holes and the air passing holes are alternately arranged.
According to the deep mine gas-water mixed penetration test system, the water pump adopts the high-pressure plunger pump, and the single water injection amount of the high-pressure plunger pump is more than or equal to 40L.
According to the deep mine gas-water mixed penetration test system, the gas cylinder is a high-pressure gas cylinder, and the pressure supply range of the high-pressure gas cylinder is 0-25 Mpa.
In the deep mine gas-water mixed penetration test system, the pressure control device adopts an electronic universal testing machine.
According to the deep mine gas-water mixed penetration test system, the first pressure sensor is a turbine pressure sensor, the second pressure sensor is a vortex street pressure sensor, the first flowmeter is a turbine flowmeter, the second flowmeter and the third flowmeter are vortex street flowmeters, the measuring ranges of the first pressure sensor and the second pressure sensor are 0-10 MPa, and the measuring ranges of the first flowmeter, the second flowmeter and the third flowmeter are 0-10L/min.
The deep mine gas-water mixed penetration test system is characterized in that the recorder comprises a plurality of parallel data acquisition channels, and the sampling frequency is 1 time/second.
The invention also discloses a test method of the deep mine gas-water mixed penetration test system, which adopts the test system and comprises the following steps:
step one, preparing a sample;
step 101, taking a coal body to be researched, crushing the coal body into sufficient crushed coal samples with different particle size intervals through a crusher for later use;
102, preparing a plurality of groups of crushed coal samples with planned mixture ratio according to a test scheme, numbering the crushed coal samples for use, and calculating a grading test according to the following formula:
P＝(d/D)n×100％
wherein P is the proportion of the crushed coal sample passing through the sieve mesh D, D is the current particle size of the crushed coal sample, D is the maximum particle size in the grading, and n is the Talbol power exponent;
step two, building a test system;
step 201, a sample is loaded into a cylinder barrel of a penetration device, and a piston body is placed on the upper part of the sample;
step 202, connecting a first pressure sensor, a second pressure sensor, a first flowmeter, a second flowmeter, a third flowmeter and a weighing sensor with the input end of a recorder;
step 203, contacting a pressure head of the electronic universal testing machine with the upper end face of the piston body;
step three, detecting the air tightness of the test system;
step 301, closing a drain valve and a water pump on the gas-water separation device;
step 302, opening a gas cylinder valve, releasing 1MPa of gas into a pipeline, and observing whether a gas leakage phenomenon exists in the pipeline;
step 303, when no air leakage exists in the pipeline, closing the valve of the air bottle;
step four, carrying out a water-gas mixing permeation test;
step 401, opening the electronic universal testing machine, performing axial pressure control on the piston body through a pressure head, and changing the axial pressure control into constant pressure control after the pressure is stable;
step 402, starting a recorder and an upper computer, and carrying out test global data monitoring and recording;
step 403, starting a water pump and a gas cylinder, and respectively adjusting output osmotic pressure to be a preset value as initial osmotic pressure of osmosis;
step 404, completing the osmotic test under the gradient osmotic pressure, and then respectively adjusting the output osmotic pressures of the water pump and the gas cylinder to perform the next gradient test;
step 405, after the planned tests of the group of samples are completed, closing the water pump and the gas cylinder, and opening a drain valve of the gas-water separation device to drain water and reduce pressure;
step 406, controlling the electronic universal testing machine to release pressure, taking out waste materials in the cylinder barrel, and wiping the cylinder barrel for the next group of tests;
step 407, copying whole-course recorded data from the recorder through a secret key, and recording an analysis interval through an upper computer;
step 408, loading the next group of samples into the cylinder, testing according to the steps 401 to 407, and after all tests are finished, cleaning the system again;
and step five, analyzing and calculating the collected data in the test process.
In the fifth step, the specific process of analyzing and calculating the data collected in the test process includes:
step 501, calculating the effective permeability of the gas phase;
wherein, KgeEffective permeability in the gas phase, PaAt atmospheric pressure, QgIs the amount of air flow, μgIs the gas viscosity number, L is the length of the sample, A is the cross-sectional area of the sample, P1Is the airflow inlet pressure;
step 502, calculating the effective permeability of the water phase;
wherein, KweIs an effective permeability of the aqueous phase, QwIs the water flow rate, muwIs the viscosity number of water, P3Is the inlet pressure of water, P2Is the outlet pressure of the water;
step 503, calculating the relative permeability of the gas phase and the water phase;
wherein, KgrIs the relative permeability of the gas phase, KwrRelative permeability of the aqueous phase, Kg(Sws) Effective permeability of gas phase in water-bound state;
step 504, calculating the water and gas saturation;
wherein S iswIs the water saturation, SgIs the saturation of gas, miMass m of the hydrous sample0Is the mass of a dry sample, VpIs the void volume of the sample, pwIs the density of water.
Compared with the prior art, the invention has the following advantages:
1. the system of the invention has simple structure, reasonable design and convenient realization.
2. The invention designs the water pump for providing a water source for the infiltration device and the gas cylinder for providing a gas source for the infiltration device, and can realize large-range and high-precision independent control of gas-liquid two-phase infiltration parameters by separated gas-liquid control.
3. According to the penetration device, the water flow channel and the air flow channel are designed in the base, the first water permeable plate is arranged on the upper portion of the water flow channel and the upper portion of the air flow channel, the water passing holes and the air passing holes are alternately arranged on the first water permeable plate, and the lower surface of the test body is guaranteed to be acted by two uniformly distributed flow fields.
4. The invention designs the data acquisition unit and the data analysis display unit, and the data acquisition unit and the data analysis display unit are uploaded to the recorder by arranging corresponding sensors at the fluid flowing pipeline and the collection part, thereby realizing the real-time accurate acquisition of the data of each pipeline and ensuring the trueness and accuracy of the data.
5. The invention realizes the real-time visualization and storage of the penetration parameters in the mixed penetration process through data conversion, accurately knows the change rule of the penetration parameters in the penetration process, and records each penetration parameter in the penetration process in real time.
6. The invention realizes one-key storage of test data by the recorder, realizes free selection of the test data by the partition section by matching with the upper computer, and protects all original data by the one-to-one corresponding relation of the recorder and the upper computer with keys for data transmission.
7. The method can be effectively applied to the gas-water mixed penetration test of the deep mine, realizes the simulation test of the gas-water different pressure phenomena under the mine by combining the test method, is close to the actual mine, has real-time and accurate data acquisition, obvious effect and convenient popularization.
In conclusion, the system disclosed by the invention is simple in structure, reasonable in design and convenient to implement, can be effectively applied to a gas-water mixed penetration test of a deep mine, is combined with a test method to realize a simulation test of different pressure phenomena of gas-water under the mine, is close to the actual condition of the mine, is accurate in data acquisition in real time, is remarkable in effect and is convenient to popularize.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic view of the construction of the permeation device according to the present invention;
FIG. 3 is a flow chart of the test method of the present invention.
Description of reference numerals:
1-a permeation device; 1-a base; 1-2-cylinder;
1-3-water flow channel; 1-4-gas flow channel; 1-5-a first porous plate;
1-6-sample; 1-7-a piston body; 1-8-a second porous plate;
1-9-water gas channel; 1-10-bolt; 1-11-a first seal ring;
1-12-second seal ring; 1-13-third seal ring; 2, a water pump;
3, a gas cylinder; 4-a pressure control device; 5, water inlet pipe;
6-a first one-way valve; 7, an air inlet pipe; 8-a second one-way valve;
9-gas-water separation device; 10-a first pressure sensor; 11 — a first flow meter;
12 — a second pressure sensor; 13-a second flow meter; 14-water gas discharge pipe;
15-a third one-way valve; 16-an exhaust pipe; 17-a third flow meter;
18-a fourth one-way valve; 19-a drain valve; 20-weighing support;
21-a load cell; 22-recorder; 23-upper computer.
Detailed Description
As shown in fig. 1, the deep mine gas-water mixed penetration test system of the invention comprises a penetration test unit, a data acquisition unit and a data analysis and display unit; the penetration test unit comprises a penetration device 1, a water pump 2 for providing a water source for the penetration device 1, a gas cylinder 3 for providing a gas source for the penetration device 1 and a pressure control device 4 for providing stress loading and unloading for the penetration device 1; a water inlet pipe 5 is connected between the penetration device 1 and the water pump 2, a first one-way valve 6 is arranged on the water inlet pipe 5, an air inlet pipe 7 is connected between the penetration device 1 and the air bottle 3, and a second one-way valve 8 is arranged on the air inlet pipe 7; the data acquisition unit comprises a gas-water separation device 9, a first pressure sensor 10 and a first flowmeter 11 which are arranged on the water inlet pipe 5, and a second pressure sensor 12 and a second flowmeter 13 which are arranged on the air inlet pipe 7; a water vapor discharge pipe 14 is connected between the gas-water separation device 9 and the permeation device 1, a third one-way valve 15 is arranged on the water vapor discharge pipe 14, an exhaust pipe 16 is arranged at the top of the gas-water separation device 9, a third flow meter 17 and a fourth one-way valve 18 are arranged on the exhaust pipe 16, a drain valve 19 is arranged on the side surface of the gas-water separation device 9, a weighing support 20 is arranged at the bottom of the gas-water separation device 9, and a weighing sensor 21 is arranged on the weighing support 20; the data analysis display unit comprises a recorder 22 and an upper computer 23 connected with the recorder 22, and the first pressure sensor 10, the second pressure sensor 12, the first flowmeter 11, the second flowmeter 13, the third flowmeter 17 and the weighing sensor 21 are all connected with the input end of the recorder 22.
In specific implementation, the gas-water separation device 9 is made of high-strength toughened glass, the bottom of the gas-water separation device is cemented by high-strength glass cement, and the gas-water separation device can bear the pressure of more than 50 MPa; the weighing support 20 comprises an X-shaped support and a scale pan positioned on the upper part of the X-shaped support, the support is made of high-strength stainless steel, the scale pan is made of high-strength toughened glass, and weighing sensors 21 are respectively arranged on four corners of the X-shaped support.
In specific implementation, the recorder 22 and the upper computer 23 can be directly connected with the computer through 485 switching USB, real-time data acquisition and visualization in the whole test process can be realized through the upper computer 23, and test data can be rapidly and simply analyzed through the upper computer 23; one-button storage of test data is realized through the recorder 22, the upper computer 23 is matched, the free selection of the test data in the partition section is realized, the data transmission of the recorder 22 and the upper computer 23 is provided with a secret key, and all original data are protected through the one-to-one corresponding relation.
In specific implementation, in order to ensure the consistency of the flow direction of fluid, a first one-way valve 6 is arranged on a water inlet pipe 5, a second one-way valve 8 is arranged on an air inlet pipe 7, a third one-way valve 15 is arranged on a water vapor discharge pipe 14, a fourth one-way valve 18 is arranged on an air exhaust pipe 16, the water inlet pipe 5 and the air inlet pipe 7 adopt oil pipes, the pressure-resistant grade of the oil pipes is not less than 10.0MPa, the temperature-resistant range is-20 ℃ to +60 ℃, and the corrosion-resistant low-roughness rubber pipe is adopted.
In this embodiment, as shown in fig. 2, the infiltration apparatus 1 includes a base 1-1 and a cylinder 1-2 disposed on the upper portion of the base 1-1, a water flow channel 1-3 and an air flow channel 1-4 are disposed in the base 1-1, the water inlet pipe 5 is in threaded connection with the water flow channel 1-3, the air inlet pipe 7 is in threaded connection with the air flow channel 1-4, a first water permeable plate 1-5 disposed above the water flow channel 1-3 and the air flow channel 1-4 is disposed at the joint of the base 1-1 and the cylinder 1-2, the cylinder 1-2 is used for placing a sample 1-6, a piston body 1-7 disposed above the sample 1-6 is disposed on the upper portion of the cylinder 1-2, a second water permeable plate 1-8 is disposed between the piston body 1-7 and the sample 1-6, the water and gas cylinder is characterized in that water and gas channels 1-9 are arranged in the piston body 1-7, the water and gas discharge pipe 14 is in threaded connection with the water and gas channels 1-9, a plurality of bolts 1-10 are connected between the base 1-1 and the cylinder barrel 1-2, first sealing rings 1-11 are arranged between the base 1-1 and the cylinder barrel 1-2, and second sealing rings 1-12 and third sealing rings 1-13 are arranged between the piston body 1-7 and the cylinder barrel 1-2.
In specific implementation, the sealing performance is improved through threaded connection; eight bolts 1-10 are connected between the base 1-1 and the cylinder barrel 1-2, and the base 1-1 and the cylinder barrel 1-2 are fastened and sealed through the eight bolts 1-10; the sealing performance between the base 1-1 and the cylinder barrel 1-2 is further improved through the first sealing ring 1-11; and a second sealing ring 1-12 and a third sealing ring 1-13 are arranged between the piston body 1-7 and the cylinder barrel 1-2 and are used for preventing the reduction of the sealing performance and the test failure caused by the side wall leakage in the test process.
In this embodiment, the first permeable plate 1-5 is provided with a plurality of water passing holes communicated with the water flow channels 1-3 and a plurality of air passing holes communicated with the air flow channels 1-4, and the water passing holes and the air passing holes are alternately arranged.
During specific implementation, the water passing holes and the air passing holes are alternately arranged, so that the lower surfaces of the samples 1-6 are ensured to be acted by two uniformly distributed flow fields.
In this embodiment, the water pump 2 adopts a high-pressure plunger pump, and the single water injection amount of the high-pressure plunger pump is greater than or equal to 40L.
When the device is specifically implemented, the high-pressure plunger pump is used for providing stable and adjustable water pressure.
In the embodiment, the gas cylinder 3 is a high-pressure gas cylinder, and the pressure supply range of the high-pressure gas cylinder is 0-25 Mpa.
During specific implementation, the gas storage quantity of the high-pressure gas bottle can continuously supply gas for more than 10 minutes, and the pressure reducing valve is arranged, so that the gas pressure in the bottle can be observed in real time, the high-pressure gas in the bottle can be adjusted to be low-pressure gas with the pressure of 0-6 MPa, and the osmotic pressure of the output gas can be stably controlled.
In this embodiment, the pressure control device 4 is an electronic universal testing machine.
During specific implementation, the electronic universal testing machine can provide stable and controllable stress loading and unloading and displacement control, and can acquire change history data of stress and displacement in the control process.
In this embodiment, the first pressure sensor 10 is a turbine pressure sensor, the second pressure sensor 12 is a vortex street pressure sensor, the first flowmeter 11 is a turbine flowmeter, the second flowmeter 13 and the third flowmeter 17 are vortex street flowmeters, the measurement ranges of the first pressure sensor 10 and the second pressure sensor 12 are both 0-10 MPa, and the measurement ranges of the first flowmeter 11, the second flowmeter 13 and the third flowmeter 17 are all 0-10L/min.
In this embodiment, the recorder 22 includes a plurality of parallel data acquisition channels, and the sampling frequency is 1 time/second.
In specific implementation, the recorder 22 is a paperless recorder, the number of data acquisition channels of the paperless recorder is more than seven, the memory is not less than 32M, and the sampling frequency is not less than 1 time/second.
As shown in fig. 3, the testing method of the deep mine gas-water mixed penetration testing system of the invention comprises the following steps:
step one, preparing samples 1-6;
step 101, taking a coal body to be researched, crushing the coal body into sufficient crushed coal samples with different particle size intervals through a crusher for later use;
102, preparing a plurality of groups of crushed coal samples with planned mixture ratio according to a test scheme, numbering the crushed coal samples for use, and calculating a grading test according to the following formula:
P＝(d/D)n×100％
wherein P is the proportion of the crushed coal sample passing through the sieve mesh D, D is the current particle size of the crushed coal sample, D is the maximum particle size in the grading, and n is the Talbol power exponent;
step two, building a test system;
step 201, loading a sample 1-6 into a cylinder barrel 1-2 of a penetration device 1, and placing a piston body 1-7 on the upper part of the sample 1-6;
step 202, connecting the first pressure sensor 10, the second pressure sensor 12, the first flowmeter 11, the second flowmeter 13, the third flowmeter 17 and the weighing sensor 21 with the input end of a recorder 22;
step 203, contacting a pressure head of the electronic universal testing machine with the upper end surfaces of the piston bodies 1-7;
step three, detecting the air tightness of the test system;
step 301, closing a drain valve 19 and a water pump 2 on the gas-water separation device 9;
step 302, opening a valve of a gas cylinder 3, releasing 1MPa of gas into a pipeline, and observing whether a gas leakage phenomenon exists in the pipeline;
step 303, when no air leakage exists in the pipeline, closing a valve of the air bottle 3;
step four, carrying out a water-gas mixing permeation test;
step 401, opening the electronic universal testing machine, performing axial pressure control on the piston bodies 1-7 through a pressure head, and changing the axial pressure control into constant pressure control after the pressure is stable;
step 402, starting a recorder 22 and an upper computer 23, and carrying out overall data monitoring and recording of the test;
step 403, starting the water pump 2 and the gas cylinder 3, and respectively adjusting the output osmotic pressure to a preset value as the initial osmotic pressure of osmosis;
step 404, completing the osmotic test under the gradient osmotic pressure, and then respectively adjusting the output osmotic pressure of the water pump 2 and the air bottle 3 to perform the next gradient test;
step 405, after the planned tests of the group of samples 1-6 are completed, closing the water pump 2 and the gas bottle 3, and opening a drain valve 19 of the gas-water separation device 9 to drain water and reduce pressure;
step 406, controlling the electronic universal testing machine to release pressure, taking out the waste material in the cylinder barrel 1-2, and wiping the cylinder barrel 1-2 for the next group of tests;
step 407, copying whole-course record data from the recorder 22 through a secret key, and recording an analysis interval through the upper computer 23;
step 408, loading the next group of samples 1-6 into the cylinder barrel 1-2, testing according to the steps 401-407, and after all tests are finished, cleaning the system again;
and step five, analyzing and calculating the collected data in the test process.
In this embodiment, the specific process of analyzing and calculating the collected data of the test process in the step five includes:
step 501, calculating the effective permeability of the gas phase;
wherein, KgeEffective permeability in the gas phase, PaAt atmospheric pressure, QgIs the amount of air flow, μgIs the gas viscosity number, L is the length of the sample, A is the cross-sectional area of the sample, P1Is the airflow inlet pressure;
step 502, calculating the effective permeability of the water phase;
wherein, KweIs an effective permeability of the aqueous phase, QwIs the water flow rate, muwIs the viscosity number of water, P3Is the inlet pressure of water, P2Is the outlet pressure of the water;
step 503, calculating the relative permeability of the gas phase and the water phase;
wherein, KgrIs the relative permeability of the gas phase, KwrRelative permeability of the aqueous phase, Kg(Sws) Effective permeability of gas phase in water-bound state;
step 504, calculating the water and gas saturation;
wherein S iswIs the water saturation, SgIs the saturation of gas, miMass m of the hydrous sample0Is the mass of a dry sample, VpIs the void volume of the sample, pwIs the density of water.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a deep mine gas-water mixing penetration test system which characterized in that: the device comprises a penetration test unit, a data acquisition unit and a data analysis display unit;
the penetration test unit comprises a penetration device (1), a water pump (2) for providing a water source for the penetration device (1), a gas cylinder (3) for providing a gas source for the penetration device (1) and a pressure control device (4) for providing stress loading and unloading for the penetration device (1); a water inlet pipe (5) is connected between the penetration device (1) and the water pump (2), a first one-way valve (6) is arranged on the water inlet pipe (5), an air inlet pipe (7) is connected between the penetration device (1) and the air bottle (3), and a second one-way valve (8) is arranged on the air inlet pipe (7);
the data acquisition unit comprises a gas-water separation device (9), a first pressure sensor (10) and a first flowmeter (11) which are arranged on the water inlet pipe (5), and a second pressure sensor (12) and a second flowmeter (13) which are arranged on the air inlet pipe (7); a water-gas discharge pipe (14) is connected between the gas-water separation device (9) and the permeation device (1), a third one-way valve (15) is arranged on the water-gas discharge pipe (14), an exhaust pipe (16) is arranged at the top of the gas-water separation device (9), a third flowmeter (17) and a fourth one-way valve (18) are arranged on the exhaust pipe (16), a drain valve (19) is arranged on the side surface of the gas-water separation device (9), a weighing support (20) is arranged at the bottom of the gas-water separation device (9), and a weighing sensor (21) is arranged on the weighing support (20);
the data analysis display unit comprises a recorder (22) and an upper computer (23) connected with the recorder (22), and the first pressure sensor (10), the second pressure sensor (12), the first flowmeter (11), the second flowmeter (13), the third flowmeter (17) and the weighing sensor (21) are all connected with the input end of the recorder (22).
2. The system of claim 1, wherein: the infiltration device (1) comprises a base (1-1) and a cylinder barrel (1-2) arranged on the upper portion of the base (1-1), a water flow channel (1-3) and an air flow channel (1-4) are arranged in the base (1-1), the water inlet pipe (5) is in threaded connection with the water flow channel (1-3), the air inlet pipe (7) is in threaded connection with the air flow channel (1-4), a first water permeable plate (1-5) located above the water flow channel (1-3) and the air flow channel (1-4) is arranged at the joint of the base (1-1) and the cylinder barrel (1-2), a test sample (1-6) is placed in the cylinder barrel (1-2), a piston body (1-7) located above the test sample (1-6) is arranged on the upper portion of the cylinder barrel (1-2), a second water permeable plate (1-8) is arranged between the piston body (1-7) and the sample (1-6), a water-gas channel (1-9) is arranged in the piston body (1-7), the water-gas discharge pipe (14) is in threaded connection with the water-gas channel (1-9), a plurality of bolts (1-10) are connected between the base (1-1) and the cylinder barrel (1-2), a first sealing ring (1-11) is arranged between the base (1-1) and the cylinder barrel (1-2), and a second sealing ring (1-12) and a third sealing ring (1-13) are arranged between the piston body (1-7) and the cylinder barrel (1-2).
3. The deep mine gas-water hybrid permeability test system of claim 2, wherein: the first water permeable plate (1-5) is provided with a plurality of water passing holes communicated with the water flow channel (1-3) and a plurality of air passing holes communicated with the air flow channel (1-4), and the water passing holes and the air passing holes are alternately arranged.
4. The system of claim 1, wherein: the water pump (2) adopts a high-pressure plunger pump, and the single water injection amount of the high-pressure plunger pump is more than or equal to 40L.
5. The system of claim 1, wherein: the gas cylinder (3) adopts a high-pressure gas cylinder, and the pressure supply range of the high-pressure gas cylinder is 0-25 Mpa.
6. The system of claim 1, wherein: the pressure control device (4) adopts an electronic universal testing machine.
7. The system of claim 1, wherein: the first pressure sensor (10) adopts a turbine pressure sensor, the second pressure sensor (12) adopts a vortex street pressure sensor, the first flowmeter (11) adopts a turbine flowmeter, the second flowmeter (13) and the third flowmeter (17) both adopt vortex street flowmeters, the measurement ranges of the first pressure sensor (10) and the second pressure sensor (12) are both 0-10 MPa, and the measurement ranges of the first flowmeter (11), the second flowmeter (13) and the third flowmeter (17) are all 0-10L/min.
8. The system of claim 1, wherein: the recorder (22) comprises a plurality of parallel data acquisition channels with a sampling frequency of 1 time/second.
9. A method of testing a gas-water hybrid permeability test system for a deep mine, using a test system according to claims 1-8, the method comprising the steps of:
step one, preparing a sample (1-6);
step 101, taking a coal body to be researched, crushing the coal body into sufficient crushed coal samples with different particle size intervals through a crusher for later use;
102, preparing a plurality of groups of crushed coal samples with planned mixture ratio according to a test scheme, numbering the crushed coal samples for use, and calculating a grading test according to the following formula:
P＝(d/D)n×100％
wherein P is the proportion of the crushed coal sample passing through the sieve mesh D, D is the current particle size of the crushed coal sample, D is the maximum particle size in the grading, and n is the Talbol power exponent;
step two, building a test system;
step 201, a sample (1-6) is loaded into a cylinder (1-2) of a penetration device (1), and a piston body (1-7) is placed on the upper part of the sample (1-6);
step 202, connecting a first pressure sensor (10), a second pressure sensor (12), a first flowmeter (11), a second flowmeter (13), a third flowmeter (17) and a weighing sensor (21) with the input end of a recorder (22);
step 203, contacting a pressure head of the electronic universal testing machine with the upper end surface of the piston body (1-7);
step three, detecting the air tightness of the test system;
step 301, closing a drain valve (19) and a water pump (2) on the gas-water separation device (9);
step 302, opening a valve of the gas cylinder (3), releasing 1MPa of gas into a pipeline, and observing whether a gas leakage phenomenon exists in the pipeline;
step 303, when no air leakage exists in the pipeline, closing a valve of the air bottle (3);
step four, carrying out a water-gas mixing permeation test;
step 401, opening the electronic universal testing machine, performing axial pressure control on the piston body (1-7) through a pressure head, and changing the axial pressure control into constant pressure control after the pressure is stable;
step 402, starting a recorder (22) and an upper computer (23) to monitor and record data of the whole test situation;
step 403, starting the water pump (2) and the gas cylinder (3), and respectively adjusting the output osmotic pressure to a preset value as the initial osmotic pressure of osmosis;
step 404, completing the osmotic test under the gradient osmotic pressure, and then respectively adjusting the output osmotic pressures of the water pump (2) and the gas cylinder (3) to perform the next gradient test;
step 405, after the planned tests of the group of samples (1-6) are completed, closing the water pump (2) and the gas cylinder (3), and opening a drain valve (19) of the gas-water separation device (9) to drain water and reduce pressure;
step 406, controlling the electronic universal testing machine to release pressure, taking out the waste material in the cylinder barrel (1-2), and wiping the cylinder barrel (1-2) for the next group of tests;
step 407, copying whole-course record data from the recorder (22) through a secret key, and recording an analysis interval through an upper computer (23);
step 408, loading the next group of samples (1-6) into the cylinder barrel (1-2), testing according to the steps 401-407, and after all tests are finished, cleaning the system again;
and step five, analyzing and calculating the collected data in the test process.
10. The testing method of the deep mine gas-water mixed penetration testing system according to claim 9, wherein the concrete process of analyzing and calculating the collected data of the testing process in the fifth step comprises:
step 501, calculating the effective permeability of the gas phase;
wherein, KgeEffective permeability in the gas phase, PaAt atmospheric pressure, QgIs the amount of air flow, μgIs the gas viscosity number, L is the length of the sample, A is the cross-sectional area of the sample, P1Is the airflow inlet pressure;
step 502, calculating the effective permeability of the water phase;
wherein, KweIs an effective permeability of the aqueous phase, QwIs the water flow rate, muwIs the viscosity number of water, P3Is the inlet pressure of water, P2Is the outlet pressure of the water;
step 503, calculating the relative permeability of the gas phase and the water phase;
wherein, KgrIs the relative permeability of the gas phase, KwrRelative permeability of the aqueous phase, Kg(Sws) For restraining gas under waterPhase effective permeability;
step 504, calculating the water and gas saturation;
wherein S iswIs the water saturation, SgIs the saturation of gas, miMass m of the hydrous sample0Is the mass of a dry sample, VpIs the void volume of the sample, pwIs the density of water.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116256293A (en) * | 2022-12-13 | 2023-06-13 | 中国矿业大学 | Test device for simulating roadway surrounding rock osmotic deformation under cyclic drainage water condition |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116256293A (en) * | 2022-12-13 | 2023-06-13 | 中国矿业大学 | Test device for simulating roadway surrounding rock osmotic deformation under cyclic drainage water condition |
| CN116256293B (en) * | 2022-12-13 | 2024-04-16 | 中国矿业大学 | Test device for simulating roadway surrounding rock osmotic deformation under cyclic drainage water condition |
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Application publication date: 20211231 |