CN105067494A - Permeability testing method and device based on radial percolation experiment - Google Patents
Permeability testing method and device based on radial percolation experiment Download PDFInfo
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- CN105067494A CN105067494A CN201510405026.9A CN201510405026A CN105067494A CN 105067494 A CN105067494 A CN 105067494A CN 201510405026 A CN201510405026 A CN 201510405026A CN 105067494 A CN105067494 A CN 105067494A
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Abstract
The invention provides a permeability testing method and device based on a radial percolation experiment and belongs to a permeability testing method and device. A hole is formed in the center of a tested coal sample, gas permeates the central round hole from one side, and the permeability is tested on the basis of the radial percolation experiment and is contrasted with that obtained with a traditional axial percolation testing method. The device comprises a gas source steel cylinder, a gas flow and pressure control system, an axial loading system and a data acquisition and analysis system. Firstly, a cylindrical rock sample with a hole in the center is prepared, then gas confining pressure is applied from one side after the rock sample is arranged on a rock sample placement table, the axial loading mechanism loads axial pressure, and the gas permeates the central round hole in the radial direction from one side and then is exhausted from an exhaust port. The permeability testing method and device have the advantages as follows: the radial percolation capacity of the gas along a sample rock core is tested; methane gas provides confining pressure, which is more realistic for gas extraction research; the problem that experiments fail due to the fact that high-pressure oil is likely to permeate coal under a traditional three-axis stress condition is solved; and stress of the sample can be monitored conveniently.
Description
Technical field
The present invention relates to a kind of permeability method of testing and device, particularly a kind of permeability method of testing based on Radial Flow Through Porous Media experiment and device.
Background technology
The migration rule that the test of rock stratum or coal seam permeability not only deposits gas to the tax of announcement underground is significant, and for assessing coal-bed gas extraction and preventing Gas Disaster to provide important evaluation criterion.
The test of nature rock stratum or coal seam permeability has experimental method and site inspection method usually, both obtains permeability according to Darcy's law again by measuring some related datas.
Traditionally, the cylindrical coal sample of general preparation, then diaphragm seal is pasted in coal sample side, hydraulic oil adds confined pressure to coal sample, due to only to the side seal of coal sample and cylinder sample two ends need to carry out gas flow, so hydraulic oil easily invades media and causes the failure of an experiment, in addition because side foil gauge is by the extruding of hydraulic oil, so coal body strain testing is easily inaccurate.This method of testing axially adds load, and the gases at high pressure of confining pressure indoor add confined pressure to coal sample, overcome the shortcoming of conventional test methodologies.
Summary of the invention
The object of the invention is to provide a kind of permeability method of testing based on Radial Flow Through Porous Media experiment, providing important indicator by test coal body permeability and then for evaluating gas permeability of coal seam, significant to the extraction evaluating coal-bed gas.
The object of the present invention is achieved like this: the test coal sample center drilling of method of testing, and gas, from side direction to center hole seepage flow, is measured permeability based on Radial Flow Through Porous Media experiment, surveyed permeability compare research with traditional axial seepage flow; This test macro comprises source of the gas steel cylinder, gas flow and control pressurer system, axial loading system and data collection and transmission;
The concrete steps of permeability method of testing:
1, the cylindrical coal sample of diaphragm seal is pasted in preparing centre perforate, upper and lower side;
2, source of the gas steel cylinder is connected with confining pressure room by flow valve, according to experimental procedure to pressure chamber's injecting gas; Vacuum pump is connected with confining pressure room by flow valve, vacuumizes confining pressure room according to experimental procedure;
3, confining pressure chamber interior is provided with axial load maintainer, loads specified pressure according to experimental procedure to coal sample;
4, side, confining pressure room is provided with gaseous tension sensing equipment and is connected with data acquisition unit, and Real-Time Monitoring also shows pressure gas pressure inside;
5, Video Extensometer is equipped with in side, confining pressure room, and access data collector, monitor and record the strain in coal sample seepage process.
Special purpose device: tested by Radial Flow Through Porous Media and survey permeability, proving installation comprises: source of the gas steel cylinder, flow valve, pressure transducer, confining pressure room, axial load maintainer, Video Extensometer, vacuum pump, flowmeter, gas sampling capsule, data acquisition unit and computing machine; Source of the gas steel cylinder is connected with confining pressure room by flow valve, pressure transducer, axial load maintainer, Video Extensometer are connected with computing machine by data acquisition unit with flowmeter, vacuum pump is connected with confining pressure room, gas sampling capsule is connected with flowmeter, axial load maintainer is through confining pressure room, and Video Extensometer is positioned at confining pressure indoor; Confining pressure chamber interior is provided with axial load maintainer, and side, confining pressure room is provided with gaseous tension sensing equipment, Video Extensometer is connected with data acquisition unit respectively, and data acquisition unit connects the data communication that computing machine realizes between data acquisition unit and computing machine.
Video Extensometer is equipped with in described side, confining pressure room, and access data collector, monitor and record the strain in coal sample seepage process.
Described axial load maintainer top loads rod member hollow, confining pressure room gas in coal sample Radial Flow Through Porous Media to center pit, then by hollow rods by gas discharging.
Test coal sample center drilling, upper and lower side pastes diaphragm seal.
Beneficial effect, owing to have employed such scheme, it is significant that traditional axial seepage flow method of testing composes to evaluation underground the migration rule on a large scale depositing gas, but drilling is carried out to the Radial Flow Through Porous Media problem of gas pumping and then formation, conventional test methodologies evaluation effect is barely satisfactory, this method of testing confining pressure indoor gas, to center hole seepage flow, closer to the actual conditions of gas drilling extraction, has more realistic meaning to evaluation coal bed gas extraction.For the test of gas along sample core Radial Flow Through Porous Media ability; Simultaneously with three traditional axle loading environments, confined pressure needs to rely on oil pressure provides different, adopts methane gas to provide confined pressure, has more uniqueness and creativeness for seepage research, have more actuality for gas extraction research; Under overcoming traditional condition of triaxial stress, hydraulic oil easily invades coal body and causes the problem of the failure of an experiment; Be gas medium around sample, be more conducive to monitoring the strain of sample.
Advantage: with three traditional axle loading environments, confined pressure needs to rely on oil pressure provides different, employing be that methane gas provides confined pressure, research has more creativeness and actuality; Under solving traditional condition of triaxial stress, hydraulic oil easily invades coal body and causes the problem of the failure of an experiment.
Accompanying drawing explanation
In order to be illustrated more clearly in specific embodiment of the invention, do simple introduction below to the Structure Figure in implementation process, structural representation is not the full-size(d) of actual test structure, is intended to, to reader, test philosophy of the present invention and idiographic flow thereof are described.In addition; accompanying drawing in below describing is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work; can also obtain other accompanying drawings according to these accompanying drawings, these accompanying drawings all belong to protection scope of the present invention.
Fig. 1 is Radial Flow Through Porous Media experiment test system structural drawing of the present invention.
Fig. 2 is Radial Flow Through Porous Media experimental configuration front view figure of the present invention.
Fig. 3 is Radial Flow Through Porous Media experimental configuration vertical view of the present invention.
Fig. 4 is permeability of the present invention and gaseous tension graph of a relation.
In figure, 1, source of the gas steel cylinder; 2, flow valve; 3, pressure transducer; 4, confining pressure room; 5, axial load and execution mechanism; 6, coal sample is tested; 7, Video Extensometer; 8, flowmeter; 9, vacuum pump; 10, data acquisition unit; 11, gas sampling capsule; 12, computing machine.
Embodiment
Be clearly and completely described the technical scheme in the embodiment of the present invention below, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art belong to protection scope of the present invention not making the every other embodiment obtained under creative work prerequisite.
The test coal sample center drilling of method of testing, gas, from side direction to center hole seepage flow, is measured permeability based on Radial Flow Through Porous Media experiment, is surveyed permeability compare research with traditional axial seepage flow; This test macro comprises source of the gas steel cylinder, gas flow and control pressurer system, axial loading system and data collection and transmission;
The concrete steps of permeability method of testing:
1, the cylindrical coal sample of diaphragm seal is pasted in preparing centre perforate, upper and lower side;
2, source of the gas steel cylinder is connected with confining pressure room by flow valve, according to experimental procedure to pressure chamber's injecting gas; Vacuum pump is connected with confining pressure room by flow valve, vacuumizes confining pressure room according to experimental procedure;
3, confining pressure chamber interior is provided with axial load maintainer, loads specified pressure according to experimental procedure to coal sample;
4, side, confining pressure room is provided with gaseous tension sensing equipment and is connected with data acquisition unit, and Real-Time Monitoring also shows pressure gas pressure inside;
5, Video Extensometer is equipped with in side, confining pressure room, and access data collector, monitor and record the strain in coal sample seepage process.
Special purpose device: tested by Radial Flow Through Porous Media and survey permeability, proving installation comprises: source of the gas steel cylinder 1, flow valve 2, pressure transducer 3, confining pressure room 4, axial load maintainer 5, Video Extensometer 7, vacuum pump 9, flowmeter 8, gas sampling capsule 11, data acquisition unit 10 and computing machine 12; Source of the gas steel cylinder 1 is connected with confining pressure room 4 by flow valve 2, pressure transducer 3, axial load maintainer 5, Video Extensometer 7 are connected with computing machine 12 by data acquisition unit 10 with flowmeter 8, vacuum pump 9 is connected with confining pressure room 4, gas sampling capsule 11 is connected with flowmeter 8, axial load maintainer 5 is through confining pressure room 4, and Video Extensometer 7 is positioned at confining pressure room 4; Confining pressure chamber interior is provided with axial load maintainer 5, side, confining pressure room 4 is provided with gaseous tension sensing equipment 3, Video Extensometer 7 is connected with data acquisition unit respectively, and data acquisition unit 10 connects the data communication that computing machine 12 realizes between data acquisition unit and computing machine.
Video Extensometer is equipped with in described side, confining pressure room, and access data collector, monitor and record the strain in coal sample seepage process.
Described axial load maintainer top loads rod member hollow, confining pressure room gas in coal sample Radial Flow Through Porous Media to center pit, then by hollow rods by gas discharging.
Test coal sample center drilling, upper and lower side pastes diaphragm seal.
Embodiment 1: to test the permeability (1 to 4MPa) of coal sample to methane, testing procedure is as follows:
Prepare cylindrical coal sample, central punch, coal sample height h is 50mm, diameter d
ofor 54mm, the diameter d of central small hole
ifor 2mm, coal sample upper and lower side pastes diaphragm seal, ensures the Radial Flow Through Porous Media of coal sample.
Coal sample is loaded in the lower tray of the axial load maintainer in confining pressure room, installs each device of test macro, close the flow valve of inlet end, confining pressure room is vacuumized.
Load axial load to 1MPa, then to confining pressure room injecting gas, after pressure transducer display confining pressure gas pressure inside is stable, (ensure that coal sample is to the abundant absorption of gas, and then the seepage stability of gas is reached in coal sample inside), the gaseous tension P of record confining pressure indoor
1and the gaseous tension P of coal sample center pit
2(in coal sample center pit, gas is by axially loading rod member center pit, flowmeter, finally enters gas sampling capsule, because gas sampling capsule is without pressure, so P
2be considered as atmospheric pressure).The flow reading Q of recording flowmeter.
Strengthen the gas injection rate to confining pressure room, confining pressure gas pressure inside is stablized to different pressures point.
Axial load is increased to 2MPa, 3MPa, 4MPa respectively, repeats step 3,4.
Calculate the permeability under axially different load and gaseous tension respectively, and draw.
Test philosophy and calculating thereof
Permeability is calculated by Darcy's law usually, and the prime formula of Darcy's law is Q=KFh/L, and in formula, Q is unit time seepage flow, and F is water-carrying section, and h is gross head loss, and L is percolation path length, and I=h/L is hydraulic gradient, and K is infiltration coefficient.Relational expression shows, water is inversely proportional to by the seepage flow of porous medium and percolation path length within the unit interval, is directly proportional to discharge section area and gross head loss.
This test calculates permeability by recording correlation parameter under Radial Flow Through Porous Media experiment, and the derivation formula of Darcy's law under this method is
In formula, K is permeability; μ is gas viscosity; Q is gas flow; r
ofor the radius of cylindrical coal sample; r
icentered by pore radius; H is coal sample height; P
1for the gaseous tension of confining pressure indoor; P
2for the pressure in coal sample center pit.
Calculate the permeability under axially different load and gaseous tension respectively according to above formula, and obtain figure below.
Claims (5)
1. the permeability method of testing based on Radial Flow Through Porous Media experiment, it is characterized in that: the test coal sample center drilling of method of testing, gas, from side direction to center hole seepage flow, is measured permeability based on Radial Flow Through Porous Media experiment, is surveyed permeability compare research with traditional axial seepage flow; This test macro comprises source of the gas steel cylinder, gas flow and control pressurer system, axial loading system and data collection and transmission;
The concrete steps of permeability method of testing:
(1) the cylindrical coal sample of diaphragm seal is pasted in preparing centre perforate, upper and lower side;
(2) source of the gas steel cylinder is connected with confining pressure room by flow valve, according to experimental procedure to pressure chamber's injecting gas; Vacuum pump is connected with confining pressure room by flow valve, vacuumizes confining pressure room according to experimental procedure;
(3) confining pressure chamber interior is provided with axial load maintainer, loads specified pressure according to experimental procedure to coal sample;
(4) side, confining pressure room is provided with gaseous tension sensing equipment and is connected with data acquisition unit, monitors constantly and shows pressure gas pressure inside;
(5) Video Extensometer is equipped with in side, confining pressure room, and access data collector, monitor and record the strain in coal sample seepage process.
2. the special purpose device of a kind of permeability method of testing based on Radial Flow Through Porous Media experiment according to claim 1, is characterized in that: proving installation comprises: source of the gas steel cylinder, flow valve, pressure transducer, confining pressure room, axial load maintainer, Video Extensometer, vacuum pump, flowmeter, gas sampling capsule, data acquisition unit and computing machine; Source of the gas steel cylinder is connected with confining pressure room by flow valve, pressure transducer, axial load maintainer, Video Extensometer are connected with computing machine by data acquisition unit with flowmeter, vacuum pump is connected with confining pressure room, gas sampling capsule is connected with flowmeter, and axial load maintainer is through confining pressure room; Confining pressure chamber interior is provided with axial load maintainer, side, confining pressure room is provided with gaseous tension sensing equipment and is connected with data acquisition unit, in addition the Video Extensometer of side, confining pressure room is connected with data acquisition unit, and data acquisition unit connects the data communication that computing machine realizes between data acquisition unit and computing machine.
3. the special purpose device of a kind of permeability method of testing based on Radial Flow Through Porous Media experiment according to claim 2, it is characterized in that: described confining pressure room is provided with Video Extensometer interfaces of connecting wires, Video Extensometer is external to data acquisition unit by connection jaws, and then obtains coal body strain data in coal sample seepage process.
4. a kind of permeability method of testing based on Radial Flow Through Porous Media experiment according to claim 2, it is characterized in that: described axial load maintainer top loads rod member hollow, confining pressure room gas in coal sample Radial Flow Through Porous Media to center pit, then by hollow rods by gas discharging.
5. a kind of permeability method of testing based on Radial Flow Through Porous Media experiment according to claim 3, it is characterized in that: described test coal sample center drilling, upper and lower side pastes diaphragm seal.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106525526A (en) * | 2016-10-26 | 2017-03-22 | 山东科技大学 | Determination method of high-pressure water injection and radial gas permeability of gas-containing raw coal |
| CN107870144A (en) * | 2017-11-07 | 2018-04-03 | 中国矿业大学 | A kind of test device and method of coal petrography body strain crack permeability |
| CN107907413A (en) * | 2017-11-15 | 2018-04-13 | 中国矿业大学 | A kind of magnetic intends moonscape gravitational field vacuum environment experimental rig and test method |
| WO2018129920A1 (en) * | 2017-01-12 | 2018-07-19 | 四川大学 | Sample component for radial permeability test of rock having extra-low permeability and test method therefor |
| CN109211754A (en) * | 2018-09-29 | 2019-01-15 | 中国矿业大学 | A kind of Permeability Oe Coal And Porous Rock And Fractured Rock measurement device and method |
| CN109470621A (en) * | 2018-12-13 | 2019-03-15 | 重庆科技学院 | A kind of measuring device for formation permeability |
| CN109991121A (en) * | 2017-12-31 | 2019-07-09 | 中国人民解放军63653部队 | The infiltrative test method of concrete gas is tested using concrete pipe test specimen |
| CN110231270A (en) * | 2019-06-05 | 2019-09-13 | 东南大学 | A kind of concrete gas radial penetration performance test device and method |
| CN110308052A (en) * | 2019-08-01 | 2019-10-08 | 中国矿业大学 | Hollow rock sample Radial Flow Through Porous Media experimental rig and test method based on acoustic emission |
| CN111395495A (en) * | 2020-05-06 | 2020-07-10 | 中铁二院工程集团有限责任公司 | Underground drainage seepage pipe structure, seepage performance evaluation method and construction method |
| CN111766188A (en) * | 2020-05-08 | 2020-10-13 | 江苏禹治流域管理技术研究院有限公司 | Device and method for evaluating permeability of uniaxial compression concrete under high-temperature condition |
| CN112855089A (en) * | 2021-02-01 | 2021-05-28 | 重庆科技学院 | Application method for calculating effective permeability of two-dimensional sand-packed model |
| CN112903566A (en) * | 2021-03-02 | 2021-06-04 | 东北石油大学 | Full-diameter core radial permeability test tool |
| CN113358480A (en) * | 2021-05-13 | 2021-09-07 | 太原理工大学 | Coal rock mechanical test device and test method |
| CN115096790A (en) * | 2022-06-22 | 2022-09-23 | 中国水利水电科学研究院 | Soil material permeability characteristic field test device and test method thereof |
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| CN106525526A (en) * | 2016-10-26 | 2017-03-22 | 山东科技大学 | Determination method of high-pressure water injection and radial gas permeability of gas-containing raw coal |
| WO2018129920A1 (en) * | 2017-01-12 | 2018-07-19 | 四川大学 | Sample component for radial permeability test of rock having extra-low permeability and test method therefor |
| CN107870144A (en) * | 2017-11-07 | 2018-04-03 | 中国矿业大学 | A kind of test device and method of coal petrography body strain crack permeability |
| CN107907413A (en) * | 2017-11-15 | 2018-04-13 | 中国矿业大学 | A kind of magnetic intends moonscape gravitational field vacuum environment experimental rig and test method |
| CN109991121A (en) * | 2017-12-31 | 2019-07-09 | 中国人民解放军63653部队 | The infiltrative test method of concrete gas is tested using concrete pipe test specimen |
| CN109211754A (en) * | 2018-09-29 | 2019-01-15 | 中国矿业大学 | A kind of Permeability Oe Coal And Porous Rock And Fractured Rock measurement device and method |
| CN109211754B (en) * | 2018-09-29 | 2023-10-31 | 中国矿业大学 | Coal rock permeability measuring device and method |
| CN109470621A (en) * | 2018-12-13 | 2019-03-15 | 重庆科技学院 | A kind of measuring device for formation permeability |
| CN109470621B (en) * | 2018-12-13 | 2021-01-26 | 重庆科技学院 | Measuring device for rock stratum permeability |
| WO2020244256A1 (en) * | 2019-06-05 | 2020-12-10 | 东南大学 | Device and method for testing radial gas permeability of concrete |
| CN110231270A (en) * | 2019-06-05 | 2019-09-13 | 东南大学 | A kind of concrete gas radial penetration performance test device and method |
| CN110308052B (en) * | 2019-08-01 | 2021-07-20 | 中国矿业大学 | Hollow rock sample radial seepage test device and test method based on acoustic emission technology |
| CN110308052A (en) * | 2019-08-01 | 2019-10-08 | 中国矿业大学 | Hollow rock sample Radial Flow Through Porous Media experimental rig and test method based on acoustic emission |
| CN111395495A (en) * | 2020-05-06 | 2020-07-10 | 中铁二院工程集团有限责任公司 | Underground drainage seepage pipe structure, seepage performance evaluation method and construction method |
| CN111766188A (en) * | 2020-05-08 | 2020-10-13 | 江苏禹治流域管理技术研究院有限公司 | Device and method for evaluating permeability of uniaxial compression concrete under high-temperature condition |
| CN112855089A (en) * | 2021-02-01 | 2021-05-28 | 重庆科技学院 | Application method for calculating effective permeability of two-dimensional sand-packed model |
| CN112855089B (en) * | 2021-02-01 | 2021-11-30 | 重庆科技学院 | Application method for calculating effective permeability of two-dimensional sand-packed model |
| CN112903566A (en) * | 2021-03-02 | 2021-06-04 | 东北石油大学 | Full-diameter core radial permeability test tool |
| CN113358480A (en) * | 2021-05-13 | 2021-09-07 | 太原理工大学 | Coal rock mechanical test device and test method |
| CN113358480B (en) * | 2021-05-13 | 2022-08-05 | 太原理工大学 | Coal rock mechanical test device and test method |
| CN115096790A (en) * | 2022-06-22 | 2022-09-23 | 中国水利水电科学研究院 | Soil material permeability characteristic field test device and test method thereof |
| CN115096790B (en) * | 2022-06-22 | 2023-03-14 | 中国水利水电科学研究院 | Soil material permeability characteristic field test device and test method thereof |
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