CN103884597A - Analogue measurement device and method for hydraulic fracturing induced surrounding rock stress change of coal bed - Google Patents
Analogue measurement device and method for hydraulic fracturing induced surrounding rock stress change of coal bed Download PDFInfo
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- CN103884597A CN103884597A CN201410072099.6A CN201410072099A CN103884597A CN 103884597 A CN103884597 A CN 103884597A CN 201410072099 A CN201410072099 A CN 201410072099A CN 103884597 A CN103884597 A CN 103884597A
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Abstract
The invention relates to the technical field of an experimental device, and discloses an analogue measurement device and an analogue measurement method for hydraulic fracturing induced surrounding rock stress change of a coal bed. The analogue measurement device is characterized by comprising four main parts, namely a first sealing cavity, a sealing cavity cover, an oil hydraulic system, a hydraulic fracturing system and a data collection system, wherein a rubber barrel is arranged inside the first sealing cavity; a pressing tongue is arranged on the sealing cavity cover; the oil hydraulic system mainly comprises a high-pressure oil pipe and an oil pump; the hydraulic fracturing system mainly comprises a high-pressure hose, a three-way valve, a pneumatic valve, a high-pressure cylinder, a waterway valve and a fracturing pump; the data collection system mainly comprises a stress sensor, a data transmission line and a data collector. The analogue measurement device can simulate the hydraulic fracturing processes of a gassy seam under the conditions of different gas pressure, different coal strength and different confining pressure, monitors the hydraulic fracturing induced surrounding rock stress change, and is simple in structure and method, and easy to operate.
Description
Technical field
The present invention relates to experimental provision technical field, refer more particularly to the analogue measurement device and method that coal seam hydraulic fracture induction surrouding rock stress changes.
Background technology
The most mining areas of China have entered deep mining, and the terrestrial stress in coal seam, deep increases, the gas penetration potential difficulty lower, gas pumping in coal seam is larger.Downhole hydraulic fracturing technique has that pressure break scope is large, relief range is large, the obvious advantage of antireflective effect, becomes that deep lower permeability seam is anti-reflection, a kind of effective technical way of region release.The phenomenons such as in the tunnel that in downhole hydraulic fracturing process, stress field of the surrounding rock variation causes, gas density increases, roadway surrounding rock bursts apart can badly influence the safety of down-hole mining activity carries out, thereby monitoring waterfrac treatment process surrouding rock stress changes and grasps change of stress field rule and carry out particularly important to the safety that ensures down-hole mining activity.But, be limited to underworkings arrangement condition, be difficult to arrange in seat earth appropriate location that monitoring instrument changes and monitors and analyze waterfrac treatment process surrouding rock stress.Carry out on ground aspect the experimental study of waterfrac treatment, domestic existing device and method is mainly used in the fracturing features such as initial cracking pressure, Crack Extension of research waterfrac treatment at present.Domestic also do not have can carry out Gas-bearing Coal Seams waterfrac treatment induced stress change three-dimensional analog simulation device and method, thereby need to develop under can the modeling effort different gas pressures of one, different coal petrography intensity and different confined pressure condition three-dimensional analog simulation measurement mechanism and method that Gas-bearing Coal Seams waterfrac treatment induced stress changes.
Summary of the invention
Technical matters to be solved by this invention is to provide one can be under different gas pressures, different coal petrography intensity and different confined pressure condition, measurement mechanism and method that simulation coal seam hydraulic fracture induction surrouding rock stress changes.
For solving the problems of the technologies described above, first the present invention proposes the analogue measurement device that a kind of coal seam hydraulic fracture induction surrouding rock stress changes, and it is characterized in that, it comprises the first seal chamber, annular seal space lid, oil hydraulic system, waterfrac treatment system and data acquisition system (DAS); In the first described seal chamber, be provided with the second seal chamber; Described oil hydraulic system comprises the high-pressure oil pipe passing in described the first seal chamber and the oil pump being connected with described high-pressure oil pipe; Described waterfrac treatment system comprises the first high-pressure hose and pressure break water pump, and described pressure break water pump is connected with described the first high-pressure hose by Water path valve, and described the first high-pressure hose passes in described the second seal chamber; Described data acquisition system (DAS) comprises data collecting instrument, some strain gauges and data line thereof, described strain gauge is distributed in the second seal chamber, described data line is connected with described strain gauge respectively, and the described data line other end is connected with the described data collecting instrument being positioned at outside the first seal chamber.
Preferably, the analogue measurement device that coal seam hydraulic fracture induction surrouding rock stress changes also comprises the second high-pressure hose and gas cylinder, described gas cylinder is connected with described the second high-pressure hose by gas circuit valve, and described the second high-pressure hose is passed in described the second seal chamber.
Preferably, the analogue measurement device that coal seam hydraulic fracture induction surrouding rock stress changes also comprises pressing machine and covers the pressure tongue of the piston-like of installation at described annular seal space, described pressure tongue is pressed on described the second seal chamber, and the output terminal of described pressing machine is connected on described pressure tongue.
Preferably, described the second seal chamber is rubber tube.
Preferably, on the segment section of described the first high-pressure hose in described the second seal chamber, be distributed with pressure break aperture.
Preferably, in described gas cylinder, store high pressure gas gas.
A measuring method for the analogue measurement device that coal seam hydraulic fracture induction surrouding rock stress changes, is characterized in that, comprises the steps:
(1), preparation coal seam mixture and each rock stratum mixture; According to coal seam and rock stratum actual (real) thickness ratio and described the second seal chamber size, calculate simulation coal seam, the simulation each rock stratum of top board and the simulation each rock stratum of base plate height according to geometric similarity ratio;
(2), according to the rock stratum layer position relation of seat earth and the simulation each rock stratum of base plate height, in described the second seal chamber, pour the simulation each rock stratum of base plate mixture in batches, solidify rear formation simulation base plate, carry out the simulation floor strata assigned address of stress test at need and arrange described strain gauge;
(3), smear sealant at simulation plate upper surface, add coal seam mixture on sealant,, described the first high-pressure hose front end is inserted in the mixture of coal seam meanwhile, coal seam mixture solidifies rear formation simulates coal seam;
(4), sealing simulation coal seam upper surface, then according to layer position, the rock stratum relation of roof and the simulation each rock stratum of top board height, add in batches the simulation each rock stratum of top board mixture at simulation coal seam upper surface, solidify rear formation simulation top board, carry out the simulation roof strata assigned address of stress test at need and arrange described strain gauge;
(5) described high-pressure oil pipe passes in described the first seal chamber, and described hydraulic oil pipe end is positioned at outside described the second seal chamber; Open oil circuit valve, pressurize in described the first seal chamber by oil pump, close oil circuit valve after reaching specified pressure;
(6) turn-on data Acquisition Instrument, opens Water path valve, injects water under high pressure and carries out waterfrac treatment, and utilize data collecting instrument to gather stress data by pressure break water pump to simulation coal seam.
Preferably, between described step (5) and described step (6), also comprise the steps: (5 '), open gas circuit valve, utilize gas cylinder to inject the methane gas of specified pressure to analog simulation coal seam, gas circuit valve is closed in gas injection after 48-72 hours, turn-on data Acquisition Instrument, and utilize data collecting instrument to gather stress data.
Preferred, between described step (4) and described step (5), also comprise the steps: (4 ') utilize described pressing machine by described pressure tongue to described the second seal chamber pressurization, until specified pressure.
Adopt technical scheme provided by the invention, compared with existing known technology, can simulate Gas-bearing Coal Seams waterfrac treatment process under different gas pressures, different coal petrography intensity and different confined pressure condition, and monitor the variation of waterfrac treatment induction surrouding rock stress, its structure and method are simple, easy operating.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, technical scheme of the present invention is further described in detail.
Fig. 1 is structural representation of the present invention;
Fig. 2 is the concrete schematic diagram using of the present invention;
In figure, 1-annular seal space, 2-rubber tube, 3-pressure tongue, 4-annular seal space lid, 5-high-pressure oil pipe, 6-oil circuit valve, 7-oil pump, 8-pressure break aperture, 9-high-pressure hose, 10-T-valve, 11-gas circuit valve, 12-gas cylinder, 13-Water path valve, 14-pressure break water pump, 15-strain gauge, 16-data line, 17-data collecting instrument, 18-simulation coal seam, 19-simulation top board, 20-simulation base plate, 21-silica gel, 22-pressing machine.
Embodiment
Below in conjunction with embodiment, technical scheme of the present invention is further described in detail.
As shown in Figure 1 and Figure 2, the analogue measurement device that a kind of coal seam hydraulic fracture induction surrouding rock stress changes, comprises the first seal chamber 1, annular seal space lid 4, oil hydraulic system, waterfrac treatment system, data acquisition system (DAS) and pressing machine 22; In the first seal chamber, be provided with rubber tube 2, annular seal space lid 4 is provided with the pressure tongue 3 of piston-like, utilizes pressing machine 22 by pressing tongue 3 to pressurize to rubber tube 2; Oil hydraulic system comprises the high-pressure oil pipe 5 passing in the first seal chamber 1 and the oil pump 7 being connected with high-pressure oil pipe 5; Waterfrac treatment system comprises high-pressure hose 9, high pressure gas gas cylinder 12, pressure break water pump 14 and T-valve 10, on high-pressure hose 9, be distributed with pressure break aperture 8, high-pressure hose 9 length are 200-300mm, internal diameter is 4-6mm, high pressure gas gas cylinder 12 is connected with T-valve 10 first ends by gas circuit valve 11, pressure break water pump 14 is connected with T-valve 10 second ends by Water path valve 13, T-valve 10 the 3rd end be connected with high-pressure hose 9, high-pressure hose 9 passes in rubber tube through the first seal chamber 1 and rubber tube cylindrical shell successively; Data acquisition system (DAS) comprises strain gauge 15, data line 16 and data collecting instrument 17, strain gauge 15 is distributed in rubber tube, data line 16 one end are connected with strain gauge 15 with rubber tube 2 cylindrical shells through the first seal chamber 1 successively, and data line 16 other ends are connected with data collecting instrument 17.
Gas-bearing Coal Seams waterfrac treatment process stress test experiments method of the present invention: comprise following steps: (1), according to specifying colliery Gas-bearing Coal Seams and rock stratum physico mechanical characteristic, preference pattern raw material, with cement and gypsum preparation coal seam mixture and each rock stratum mixture; According to coal seam and rock stratum actual (real) thickness and rubber-sleeve size, calculate simulation coal seam, the simulation each rock stratum of top board and the simulation each rock stratum of base plate height according to geometric similarity ratio; (2), according to the rock stratum layer position relation of seat earth and the simulation each rock stratum of base plate height, in the second annular seal space, pour the simulation each rock stratum of base plate mixture in batches, solidify rear formation simulation base plate, carry out the simulation floor strata assigned address of stress test at need and arrange strain gauge; (3), smear the silica gel of 2-5mm thickness at simulation plate upper surface, after silica gel solidifies, in rubber tube, pour coal seam mixture into, high-pressure hose is entered in the mixture of coal seam through the first seal chamber and rubber tube cylindrical shell successively, the high-pressure hose length that makes to enter in the mixture of coal seam reaches 200-300mm, and coal seam mixture solidifies rear formation simulation coal seam; (4), smear the silica gel of 2-5mm thickness at simulation coal seam upper surface, after silica gel solidifies, according to layer position, the rock stratum relation of roof and the simulation each rock stratum of top board height, in rubber tube, pour the simulation each rock stratum of top board mixture in batches, solidify rear formation simulation top board, carry out the simulation roof strata assigned address of stress test at need and arrange strain gauge, and be connected with data line; (5), annular seal space lid is connected with the first seal chamber, make to press tongue to be pressed in simulation cover top surface, open oil circuit valve, pressurize to rubber tube by oil pump, after reaching specified pressure, close oil circuit valve, utilize pressing machine by pressing tongue to pressurize to rubber tube, until specified pressure; (6), open gas circuit valve, utilize gas cylinder to inject the methane gas of specified pressure to analog simulation coal seam, gas circuit valve is closed in gas injection after 48-72 hours, turn-on data Acquisition Instrument, start test stress, open Water path valve, inject water under high pressure by pressure break water pump to simulation coal seam and carry out waterfrac treatment, and utilize data collecting instrument to gather stress data.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. the analogue measurement device that coal seam hydraulic fracture induction surrouding rock stress changes, is characterized in that, it comprises the first seal chamber, annular seal space lid, oil hydraulic system, waterfrac treatment system and data acquisition system (DAS); In the first described seal chamber, be provided with the second seal chamber; Described oil hydraulic system comprises the high-pressure oil pipe passing in described the first seal chamber and the oil pump being connected with described high-pressure oil pipe; Described waterfrac treatment system comprises the first high-pressure hose and pressure break water pump, and described pressure break water pump is connected with described the first high-pressure hose by Water path valve, and described the first high-pressure hose passes in described the second seal chamber; Described data acquisition system (DAS) comprises data collecting instrument, some strain gauges and data line thereof, described strain gauge is distributed in the second seal chamber, described data line is connected with described strain gauge respectively, and the described data line other end is connected with the described data collecting instrument being positioned at outside the first seal chamber.
2. the analogue measurement device that coal seam hydraulic fracture induction surrouding rock stress according to claim 1 changes, it is characterized in that, also comprise the second high-pressure hose and gas cylinder, described gas cylinder is connected with described the second high-pressure hose by gas circuit valve, and described the second high-pressure hose is passed in described the second seal chamber.
3. the analogue measurement device that coal seam hydraulic fracture induction surrouding rock stress according to claim 2 changes, it is characterized in that, also comprise pressing machine and cover the pressure tongue of the piston-like of installation at described annular seal space, described pressure tongue is pressed on described the second seal chamber, and the output terminal of described pressing machine is connected on described pressure tongue.
4. the analogue measurement device that coal seam hydraulic fracture induction surrouding rock stress according to claim 1 changes, is characterized in that, described the second seal chamber is rubber tube.
5. the analogue measurement device that coal seam hydraulic fracture induction surrouding rock stress according to claim 4 changes, is characterized in that, on the segment section of described the first high-pressure hose in described the second seal chamber, is distributed with pressure break aperture.
6. the analogue measurement device that coal seam hydraulic fracture induction surrouding rock stress according to claim 2 changes, is characterized in that, stores high pressure gas gas in described gas cylinder.
7. a measuring method for the analogue measurement device that the described coal seam hydraulic fracture induction surrouding rock stress of one of claim 1-6 changes, is characterized in that, comprises the steps:
(1), preparation coal seam mixture and each rock stratum mixture; According to coal seam and rock stratum actual (real) thickness ratio and described the second seal chamber size, calculate simulation coal seam, the simulation each rock stratum of top board and the simulation each rock stratum of base plate height according to geometric similarity ratio;
(2), according to the rock stratum layer position relation of seat earth and the simulation each rock stratum of base plate height, in described the second seal chamber, pour the simulation each rock stratum of base plate mixture in batches, solidify rear formation simulation base plate, carry out the simulation floor strata assigned address of stress test at need and arrange described strain gauge;
(3), smear sealant at simulation plate upper surface, add coal seam mixture on sealant,, described the first high-pressure hose front end is inserted in the mixture of coal seam meanwhile, coal seam mixture solidifies rear formation simulates coal seam;
(4), sealing simulation coal seam upper surface, then according to layer position, the rock stratum relation of roof and the simulation each rock stratum of top board height, add in batches the simulation each rock stratum of top board mixture at simulation coal seam upper surface, solidify rear formation simulation top board, carry out the simulation roof strata assigned address of stress test at need and arrange described strain gauge;
(5) described high-pressure oil pipe passes in described the first seal chamber, and described hydraulic oil pipe end is positioned at outside described the second seal chamber; Open oil circuit valve, pressurize in described the first seal chamber by described oil pump, close oil circuit valve after reaching specified pressure;
(6) open described data collecting instrument, open Water path valve, inject water under high pressure by described pressure break water pump to simulation coal seam and carry out waterfrac treatment, and utilize data collecting instrument to gather stress data.
8. the measuring method of the analogue measurement device that coal seam hydraulic fracture induction surrouding rock stress according to claim 7 changes, is characterized in that, between described step (5) and described step (6), also comprises the steps:
(5 '), open gas circuit valve, utilize described gas cylinder to inject the methane gas of specified pressure to analog simulation coal seam, gas circuit valve is closed in gas injection after 48-72 hours, turn-on data Acquisition Instrument, and utilize data collecting instrument to gather stress data.
9. the measuring method of the analogue measurement device that coal seam hydraulic fracture induction surrouding rock stress according to claim 8 changes, is characterized in that, between described step (4) and described step (5), also comprises the steps:
(4 '), utilize described pressing machine by described pressure tongue to described the second seal chamber pressurization, until specified pressure.
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| CN104481581A (en) * | 2014-12-31 | 2015-04-01 | 马新足 | Gas-injection coal seam gas displacement physical similarity simulation experiment table |
| CN105675724A (en) * | 2016-01-29 | 2016-06-15 | 中国矿业大学 | Acoustic emission positioning monitoring device and method for hydraulic fracturing fissure field of coal body containing gas |
| CN106053244A (en) * | 2016-07-07 | 2016-10-26 | 中国科学院武汉岩土力学研究所 | Salt cavern oil storage surrounding rock self-balancing triaxial compression testing apparatus and method |
| CN106198340A (en) * | 2016-06-22 | 2016-12-07 | 辽宁工程技术大学 | A kind of coal seam permeability test system and method simulating pit mining |
| CN108152184A (en) * | 2016-12-02 | 2018-06-12 | 中国石油天然气股份有限公司 | A kind of proppant flow conductivity test method based on flowing law in seam |
| CN113513313A (en) * | 2021-04-28 | 2021-10-19 | 中煤科工集团重庆研究院有限公司 | Experimental device and method for simulating coal seam hydraulic fracturing |
| CN113719281A (en) * | 2021-10-11 | 2021-11-30 | 中煤科工集团西安研究院有限公司 | Device and method for simulating transient electromagnetic response of hydraulic fracturing stratum drilling |
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| CN104481581A (en) * | 2014-12-31 | 2015-04-01 | 马新足 | Gas-injection coal seam gas displacement physical similarity simulation experiment table |
| CN105675724A (en) * | 2016-01-29 | 2016-06-15 | 中国矿业大学 | Acoustic emission positioning monitoring device and method for hydraulic fracturing fissure field of coal body containing gas |
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| CN106198340A (en) * | 2016-06-22 | 2016-12-07 | 辽宁工程技术大学 | A kind of coal seam permeability test system and method simulating pit mining |
| CN106053244A (en) * | 2016-07-07 | 2016-10-26 | 中国科学院武汉岩土力学研究所 | Salt cavern oil storage surrounding rock self-balancing triaxial compression testing apparatus and method |
| CN106053244B (en) * | 2016-07-07 | 2018-04-17 | 中国科学院武汉岩土力学研究所 | Salt cave storage tank farm country rock self-balancing type triaxial compression test device and test method |
| CN108152184A (en) * | 2016-12-02 | 2018-06-12 | 中国石油天然气股份有限公司 | A kind of proppant flow conductivity test method based on flowing law in seam |
| CN113513313A (en) * | 2021-04-28 | 2021-10-19 | 中煤科工集团重庆研究院有限公司 | Experimental device and method for simulating coal seam hydraulic fracturing |
| CN113719281A (en) * | 2021-10-11 | 2021-11-30 | 中煤科工集团西安研究院有限公司 | Device and method for simulating transient electromagnetic response of hydraulic fracturing stratum drilling |
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