CN210604281U - Load-bearing coal rock unsteady state gas-water two-phase seepage flow experimental apparatus - Google Patents
Load-bearing coal rock unsteady state gas-water two-phase seepage flow experimental apparatus Download PDFInfo
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- CN210604281U CN210604281U CN201921665538.9U CN201921665538U CN210604281U CN 210604281 U CN210604281 U CN 210604281U CN 201921665538 U CN201921665538 U CN 201921665538U CN 210604281 U CN210604281 U CN 210604281U
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Abstract
The utility model discloses a load coal petrography astable gas-water double-phase seepage flow experimental apparatus, including coal sample holder unit, pressure monitoring measurement unit, gaseous supply unit, liquid supply unit, back pressure unit and gas-water separation measurement unit. The coal sample holder unit can simulate the conditions of the coal rock high-temperature high-pressure in-situ stratum; the pressure monitoring and metering unit realizes the gradient measurement of pressure through the pressure sensor; the gas supply unit realizes the accurate control of the upstream pressure of the coal sample holder; the liquid supply unit measures the water phase permeability; the liquid in the coal sample and at the coal sample outlet can be prevented from being vaporized in a high-temperature experiment through the back pressure unit, and the production pressure difference during coal seam mining can be simulated; finally, gas and water flow can be accurately measured through the gas-water separation measuring unit, the coal sample gas-water relative permeability and the corresponding water saturation are calculated, the research on the seepage characteristic under the condition of simulating the high-temperature high-pressure in-situ stratum of the coal rock can be realized, and the intuitiveness is strong.
Description
Technical Field
The utility model relates to a seepage flow mechanics technical field, concretely relates to a double-phase seepage flow experimental apparatus of loaded coal petrography unsteady state gas-water for simulating under coal reservoir high temperature, the high-pressure environment.
Background
China has abundant coal resources, the available coal reserves account for about 11.67 percent of the world coal reserves, the coal reserves third in the world fall down in proportion to the report of Chinese energy prospect 2030, but the coal is still used as the main energy of China in a long time in the future and cannot be changed.
Coal bed gas is also called coal bed gas, is a clean and economic resource, has a very wide development and utilization prospect, can replace other reduced conventional energy sources, but the suffocating and explosive gas is also a root cause of serious accidents in a coal mine, and the current underground gas extraction is a main effective measure for preventing and treating gas disasters. Under the condition of an in-situ stratum, coal rocks are all water-containing, the influence of coal bed water on gas flow must be considered for underground gas extraction for reducing gas disasters, but at present, researches on gas-water two-phase seepage laws are not many at home and abroad, particularly, the researches on two-phase seepage under high temperature and high pressure are less, so that the problems are solved one by one through improvement of experimental technology, and the research of a loaded coal rock unsteady gas-water two-phase seepage experimental device provides technical support for deep research on coal rock gas water two-phase seepage under the high temperature and high pressure condition.
Disclosure of Invention
The utility model aims at providing a defect to prior art exists provides a two-phase seepage flow experimental apparatus of loaded coal petrography astable gas-water, can realize the research of the two-phase seepage flow characteristic of gas-water in the coal body that develops under simulation coal petrography high temperature high pressure normal position stratum condition.
The technical scheme of the utility model is that: a load coal petrography unsteady state gas-water two-phase seepage flow experimental apparatus includes:
the coal sample clamp device comprises a clamp device shell for clamping a coal sample, and an inlet pressure head and an outlet pressure head which are arranged at two ends of the clamp device shell, wherein channels communicated with the coal sample are respectively arranged on the inlet pressure head and the outlet pressure head;
the pressure monitoring and metering unit comprises an upstream pressure sensor group and a downstream pressure sensor group which are respectively connected to pipelines at pressure heads at two ends of the shell of the holder through pipelines;
the gas supply unit comprises a gas bottle, the outlet end of the gas bottle is respectively connected with an emptying valve, a gas bottle pressure gauge and a gas fine adjustment valve, the outlet end of the gas fine adjustment valve is connected with a humidifying container through a gas transmission pipeline, the outlet end and the inlet end of the humidifying container are respectively provided with a gas supply valve, and the outlet end of the humidifying container is connected with a gas inlet channel of an inlet pressure head through the gas transmission pipeline;
the liquid supply unit comprises a displacement pump and an intermediate container, liquid supply valves are respectively arranged at two ends of the intermediate container, and the outlet end of the displacement pump is connected with a liquid inlet channel of the inlet pressure head through a liquid conveying pipeline sequentially through the intermediate container and the first manual valve;
the back pressure unit comprises a back pressure valve, a nitrogen gas cylinder, a pressure reducer, a nitrogen valve and a condenser which are arranged at the downstream end of the coal sample holder unit, the outlet end of the nitrogen gas cylinder is respectively provided with a nitrogen gas blow-down valve and a nitrogen gas pressure gauge, and the outlet end of the nitrogen gas cylinder is connected with a gas-liquid channel of the outlet pressure head through a nitrogen pipeline sequentially through the pressure reducer, the back pressure valve and the second manual valve;
the gas-water separation metering unit comprises a gas-water separator, a micro-pressure sensor and a gas flowmeter, the condenser is arranged on a pipeline between the back pressure valve and the gas-water separator, the micro-pressure sensor is arranged at the liquid outlet end of the gas-water separator, and the gas flowmeter is arranged at the gas outlet end of the gas-water separator.
Preferably, the outlet end of the gas-water separator is connected with a liquid storage container through a valve, and the bottom of the liquid storage container is provided with a precision analytical balance.
Preferably, the upstream pressure sensor group comprises a water path upstream pressure sensor group arranged on the infusion pipeline and a gas path upstream pressure sensor group arranged on the gas pipeline.
Preferably, the pressure sensors of the water path upstream pressure sensor group, the gas path upstream pressure sensor group and the downstream pressure sensor group are two, and the two pressure sensors are respectively connected to the pipeline and are separated by an automatic valve.
The number of the gas flow meters is 3, and the gas flow meters are respectively connected to the gas outlet ends of the gas-water separator.
Preferably, the pressure sensors and the gas flow meter of the waterway upstream pressure sensor group, the gas circuit upstream pressure sensor group and the downstream pressure sensor group are respectively electrically connected with the computer monitoring and data acquisition system.
Compared with the prior art, the utility model, have following advantage: the coal sample holder unit can simulate the conditions of the coal rock high-temperature high-pressure in-situ stratum; the pressure monitoring and metering unit realizes the gradient measurement of pressure through the pressure sensor; the gas supply unit realizes the accurate control of the upstream pressure of the coal sample holder; the liquid supply unit measures the water phase permeability; the liquid in the coal sample and at the coal sample outlet can be prevented from being vaporized in a high-temperature experiment through the back pressure unit, and the production pressure difference during coal seam mining can be simulated; finally, gas and water flow at the outlet end of the coal sample can be accurately measured through the gas-water separation measuring unit, the gas-water relative permeability and the corresponding water saturation of the coal sample are calculated, a gas-water relative permeability curve can be drawn, and the research on the gas-water two-phase seepage characteristics in the coal body under the condition of simulating the high-temperature high-pressure in-situ stratum of the coal rock can be realized and is intuitive.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure: 1-a gas cylinder; 2-an emptying valve; 3-gas cylinder pressure gauge; 4-gas fine adjustment valve; 5-a first gas supply valve; 6-a humidifying container; 7-a second gas supply valve; 8-a first gas circuit upstream pressure sensor; 9-a second gas path upstream pressure sensor; 10-a second automatic valve; 11-a gripper housing; 12-a first supply valve; 13-inlet head; 14-an intermediate container; 15-outlet head; 16-a first manual valve; 17-a second supply valve; 18-a first waterway upstream pressure sensor; 19-a second water circuit upstream pressure sensor; 20-a first automatic valve; 21-confining pressure gauge; 22-a third manual valve; 23-a first downstream pressure sensor; 24-a displacement pump; 25-a metering pump; 26-pump pressure gauge; 27-second manual valve; 28-a condenser; 29-a back pressure valve; 30-nitrogen valve; 31-nitrogen purge valve; 32-a pressure reducer; 33-nitrogen pressure gauge; 34-nitrogen gas cylinder; 35-a gas flow meter; 40-a gas-water separator; 41-micro pressure sensor; 42-a fourth manual valve; 43-a metering container; 44-precision analytical balance; 45-a thermostat; 46-second downstream pressure sensor.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Example one
Referring to fig. 1, the loaded coal rock unsteady gas-water two-phase seepage experiment device comprises a coal sample holder unit, a pressure monitoring and metering unit, a gas supply unit, a liquid supply unit, a back pressure unit and a gas-water separation and metering unit.
The coal sample holder unit comprises a holder shell 11 for holding a coal sample, an inlet pressure head 13 and an outlet pressure head 15, wherein the inlet pressure head 13 and the outlet pressure head 15 are arranged at two ends of the holder shell, and an air inlet channel and a liquid inlet channel which are communicated with the coal sample are arranged in the inlet pressure head 13. A gas-liquid channel communicated with the coal sample is arranged in the outlet pressure head 15. The gripper shell 11 is connected with a metering pump 25 for confining pressure loading through a pipeline, and a constant temperature box 45 is arranged outside the gripper shell 11. In order to simulate the conditions of the coal rock high-temperature high-pressure in-situ stratum, the design of the confining pressure unit and the temperature monitoring unit is carried out, and the influence of overlarge dead volume on metering is considered during the design of the holder, so that the dead volume of an inlet and an outlet is reduced as much as possible during the design. Confining pressure loading is realized through a metering pump 25, a confining pressure gauge 21 is further arranged on the pipeline, and the stress loading range is 0-50 MPa. Utilize thermostated container 45 to realize coal reservoir temperature analog control, thermostated container 45 controlled temperature: room temperature to 200 ℃.
The pressure monitoring and metering unit comprises an upstream pressure sensor group and a downstream pressure sensor group which are respectively connected with an inlet head 13 and an outlet head 15 at two ends of the clamp shell 11 through pipelines. In order to accurately measure the pressure of the upstream end and the downstream end of the coal sample, a pressure sensor group is specially designed, the pressure sensor group consists of sensors with different measuring ranges, the sensors are connected in series and separated by automatic valves, and during an experiment, the sensors are detected by a computer and selected by switching on and off the corresponding automatic valves, so that the gradient measurement of the pressure is realized.
The gas supply unit comprises a gas cylinder 1, the outlet end of the gas cylinder 1 is connected with an emptying valve 2, a gas cylinder pressure gauge 3 and a gas fine adjustment valve 4 respectively, the outlet end of the gas fine adjustment valve 4 is connected with a humidifying container 6 through a gas transmission pipeline, the outlet end and the inlet end of the humidifying container 6 are provided with a first gas supply valve 5 and a second gas supply valve 7 respectively, and the outlet end of the humidifying container 6 is connected with a gas inlet channel of an inlet pressure head 13 through the gas transmission pipeline. During the experiment, the pressure at the upstream of the coal sample holder is accurately controlled by adjusting the gas fine adjustment valve 4. The humidifying container 6 is mainly used for gas drive after humidifying gas so as to reduce the influence on core air drying during dry gas drive.
The liquid supply unit comprises a displacement pump 24 and an intermediate container 14, a first liquid supply valve 12 and a second liquid supply valve 17 are respectively arranged at two ends of the intermediate container 14, and the outlet end of the displacement pump 24 is connected with the liquid inlet channel of the inlet pressure head 13 through the intermediate container 14 and the first manual valve 16 in sequence through a liquid conveying pipeline. The intermediate reservoir 14 serves to store and convey the working medium in order to reduce pressure fluctuations caused by the displacement pump 24.
The back pressure unit comprises a back pressure valve 29, a nitrogen gas cylinder 34, a pressure reducer 32, a nitrogen gas valve 30 and a condenser 28 which are arranged at the downstream end of the coal sample holder unit, the outlet end of the nitrogen gas cylinder 34 is respectively provided with a nitrogen gas emptying valve 31 and a nitrogen gas pressure gauge 33, and the outlet end of the nitrogen gas cylinder 34 is connected with a gas-liquid channel of the outlet pressure head 15 through a nitrogen gas pipeline sequentially through the pressure reducer 32, the back pressure valve 29 and the second manual valve 27. The liquid in the coal sample and at the coal sample outlet can be prevented from being vaporized in the high-temperature experiment through the back pressure unit, the downstream pressure of the clamp holder shell 11 can be accurately controlled by controlling the gas pressure supplied to the back pressure valve 29 through the nitrogen gas bottle 34 and the pressure reducer 32, and the back pressure valve 29 can be used for preventing the liquid from being vaporized in the high-temperature experiment and can also realize the production pressure difference during the coal seam mining simulation through regulating the outlet back pressure. The back pressure is vented by a nitrogen vent valve 31 at the joint of the nitrogen cylinder. Purpose of using the condenser 28: the dissolved water in the gas is prevented from being increased and carried away by the gas after the downstream pressure of the coal sample is reduced.
The gas-water separation metering unit comprises a gas-water separator 40, a micro-pressure sensor 41 and a gas flowmeter 35, wherein the number of the gas flowmeters is 3, and the gas flowmeters are respectively connected to the gas outlet end of the gas-water separator 40. The condenser 28 is arranged on a pipeline between the back pressure valve 29 and the gas-water separator 40, and the micro-pressure sensor 41 is arranged at the liquid outlet end of the gas-water separator 40. After gas-liquid fluid from the downstream end of the coal sample enters the gas-water separator 40, gas flows out from the upper end of the gas-water separator 40, gas production is measured by using a gas flowmeter 35, the flowmeter is composed of low, medium and high range flowmeters, and a computer automatically switches and selects the gas flowmeter with corresponding specification according to the detected flow. After the liquid from the downstream end of the coal sample enters the gas-water separator 40, the liquid is collected in a thin glass tube at the lower end of the separator due to the difference of gas-liquid density, and the pressure generated by a liquid column in the glass tube can be measured by using a micro-pressure sensor 41 so as to calculate the water yield at the tail end of the coal sample.
Example two
The same as the first embodiment, except that a liquid storage container 43 is connected to the outlet end of the gas-water separator 40 through a fourth manual valve 42, and a precision analytical balance 44 is provided at the bottom of the liquid storage container 43. When the water amount exceeds the limited volume of the gas-water separator 40, the fourth manual valve 42 is opened, and the water enters a container 43 on a precision electronic balance 44 through the lower end of the gas-water separator 40 for metering.
EXAMPLE III
Basically the same as the first embodiment, except that the upstream pressure sensor group of the water circuit comprises a first upstream pressure sensor 18 of the water circuit and a second upstream pressure sensor 19 of the water circuit, which are connected to the pipes respectively and are separated by a first automatic valve 20. The gas circuit upstream pressure sensor group comprises a first gas circuit upstream pressure sensor 8 and a second gas circuit upstream pressure sensor 9 which are respectively connected on a pipeline and are separated by a second automatic valve 10. The downstream set of pressure sensors comprises a first downstream pressure sensor 23 and a second downstream pressure sensor 46, respectively connected to the line and separated by a third automatic valve 47. The pressure sensors and the gas flow meter of the water path upstream pressure sensor group, the gas path upstream pressure sensor group and the downstream pressure sensor group are respectively electrically connected with a computer monitoring and data acquisition system. The system can be used for collecting and processing parameters such as upstream and downstream pressure, gas flow and the like of the system in real time through a computer monitoring and data collecting system, and data storage is finished after an experiment is finished.
The unstable gas-water two-phase seepage experiment test process comprises the following steps: firstly, ensuring that all valves are closed, putting the prepared saturated water-containing coal sample into the coal sample holder shell 11, opening the third manual valve 22 between the metering pump 25 and the gripper housing 11 to apply the circumferential stress to the coal sample to the predetermined stress in the experimental scheme, closing the third manual valve 22, adjusting the temperature of the thermostat 45 to the experimental temperature until the system temperature reaches the set temperature, after the pressure and the temperature are stable, the first liquid supply valve 12, the first manual valve 16, the second liquid supply valve 17 and the second manual valve 27 are opened, and simultaneously opening a nitrogen valve 30, controlling the downstream pressure of the coal sample holder by using a nitrogen gas bottle 34 and a pressure reducer 32 to control the pressure of the gas supplied to the back pressure valve 29, finally opening the displacement pump 24 to continuously inject water at constant pressure, and after the flow of the coal sample outlet is stable, considering that the water seepage is stable, and measuring the water phase permeability. The first liquid supply valve 12, the first manual valve 16, the second liquid supply valve 17, the second manual valve 27, and the nitrogen valve 30 are closed, the pressure heads at both ends of the holder case 11 are removed, the water in the pipes and the moisture separator is drained, and then the system is reconnected. The second air supply valve 7 and the second manual valve 27 are opened, the pressure of the downstream of the clamp is adjusted through a back pressure valve 29, then a gas cylinder 1 is opened, a first gas supply valve 5 of methane gas is opened, a gas fine adjustment valve 4 is adjusted to adjust the upstream pressure of the clamper to the experimental gas injection pressure, then a gas drive water phase seepage test is carried out, a computer carries out real-time monitoring on the pressure sensors on the upstream and the downstream of the coal sample, and then a proper pressure sensor is automatically selected, recording the pressure at the inlet end and the outlet end of the coal sample at each moment, after the two-phase fluid enters the gas-water separator 40, the gas yield is measured by a computer automatically switching an automatic valve to select a proper gas flowmeter 35, the water yield is measured by a micro-pressure sensor 41, when the water amount exceeds the limited volume of the gas-water separator, the fourth manual valve 42 is opened, and the water enters a liquid storage container 43 on a precision electronic balance 44 through the lower end of the gas-water separator 40 for metering. And when the downstream end of the coal sample only gives out air but does not give out water and the flow rate is constant, ending the experiment. And calculating the gas-water relative permeability and the corresponding water saturation of the coal sample by using a J.B.N method, and drawing to obtain a gas-water relative permeability curve.
The present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge range of those skilled in the art without departing from the spirit of the present invention, and the changed contents still belong to the protection scope of the present invention.
Claims (6)
1. The utility model provides a two-phase seepage flow experimental apparatus of loaded coal petrography unsteady state gas-water which characterized in that includes:
the coal sample clamp device comprises a clamp device shell for clamping a coal sample, and an inlet pressure head and an outlet pressure head which are arranged at two ends of the clamp device shell, wherein channels communicated with the coal sample are respectively arranged on the inlet pressure head and the outlet pressure head;
the pressure monitoring and metering unit comprises an upstream pressure sensor group and a downstream pressure sensor group which are respectively connected to pipelines at pressure heads at two ends of the shell of the holder through pipelines;
the gas supply unit comprises a gas bottle, the outlet end of the gas bottle is respectively connected with an emptying valve, a gas bottle pressure gauge and a gas fine adjustment valve, the outlet end of the gas fine adjustment valve is connected with a humidifying container through a gas transmission pipeline, the outlet end and the inlet end of the humidifying container are respectively provided with a gas supply valve, and the outlet end of the humidifying container is connected with a gas inlet channel of an inlet pressure head through the gas transmission pipeline;
the liquid supply unit comprises a displacement pump and an intermediate container, liquid supply valves are respectively arranged at two ends of the intermediate container, and the outlet end of the displacement pump is connected with a liquid inlet channel of the inlet pressure head through a liquid conveying pipeline sequentially through the intermediate container and the first manual valve;
the back pressure unit comprises a back pressure valve, a nitrogen gas cylinder, a pressure reducer, a nitrogen valve and a condenser which are arranged at the downstream end of the coal sample holder unit, the outlet end of the nitrogen gas cylinder is respectively provided with a nitrogen gas blow-down valve and a nitrogen gas pressure gauge, and the outlet end of the nitrogen gas cylinder is connected with a gas-liquid channel of the outlet pressure head through a nitrogen pipeline sequentially through the pressure reducer, the back pressure valve and the second manual valve;
the gas-water separation metering unit comprises a gas-water separator, a micro-pressure sensor and a gas flowmeter, the condenser is arranged on a pipeline between the back pressure valve and the gas-water separator, the micro-pressure sensor is arranged at the liquid outlet end of the gas-water separator, and the gas flowmeter is arranged at the gas outlet end of the gas-water separator.
2. The device for the unsteady gas-water two-phase seepage experiment of the loaded coal rock according to the claim 1 is characterized in that: the outlet end of the gas-water separator is connected with a liquid storage container through a valve, and the bottom of the liquid storage container is provided with a precision analytical balance.
3. The device for the unsteady gas-water two-phase seepage experiment of the loaded coal rock according to the claim 2 is characterized in that: the upstream pressure sensor group comprises a water path upstream pressure sensor group arranged on the infusion pipeline and a gas path upstream pressure sensor group arranged on the gas transmission pipeline.
4. The device for the unsteady gas-water two-phase seepage experiment of the loaded coal rock according to the claim 3, is characterized in that: the pressure sensors of the water path upstream pressure sensor group, the gas path upstream pressure sensor group and the downstream pressure sensor group are two, and the two pressure sensors are respectively connected to the pipeline and are separated through an automatic valve.
5. The device for the unsteady gas-water two-phase seepage experiment of the loaded coal rock according to the claim 1 is characterized in that: the number of the gas flow meters is 3, and the gas flow meters are respectively connected to the gas outlet ends of the gas-water separator.
6. The device for the unsteady gas-water two-phase seepage experiment of the loaded coal rock according to claim 4, characterized in that: and the pressure sensors and the gas flow meter of the waterway upstream pressure sensor group, the gas circuit upstream pressure sensor group and the downstream pressure sensor group are respectively and electrically connected with a computer monitoring and data acquisition system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921665538.9U CN210604281U (en) | 2019-10-08 | 2019-10-08 | Load-bearing coal rock unsteady state gas-water two-phase seepage flow experimental apparatus |
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| CN201921665538.9U CN210604281U (en) | 2019-10-08 | 2019-10-08 | Load-bearing coal rock unsteady state gas-water two-phase seepage flow experimental apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113218838A (en) * | 2021-04-23 | 2021-08-06 | 江西理工大学 | Coal core permeability tester and testing method |
| CN113863904A (en) * | 2021-10-27 | 2021-12-31 | 中国华能集团清洁能源技术研究院有限公司 | Gas sealing experiment device and method |
| CN114441407A (en) * | 2022-01-14 | 2022-05-06 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | Hypotonic coal rock CO2Dynamic visual simulation test system and method for displacement process |
-
2019
- 2019-10-08 CN CN201921665538.9U patent/CN210604281U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113218838A (en) * | 2021-04-23 | 2021-08-06 | 江西理工大学 | Coal core permeability tester and testing method |
| CN113863904A (en) * | 2021-10-27 | 2021-12-31 | 中国华能集团清洁能源技术研究院有限公司 | Gas sealing experiment device and method |
| CN114441407A (en) * | 2022-01-14 | 2022-05-06 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | Hypotonic coal rock CO2Dynamic visual simulation test system and method for displacement process |
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