CN105134129A - Gas extraction hole sealing method based on radial strong expansion - Google Patents
Gas extraction hole sealing method based on radial strong expansion Download PDFInfo
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- CN105134129A CN105134129A CN201510630482.3A CN201510630482A CN105134129A CN 105134129 A CN105134129 A CN 105134129A CN 201510630482 A CN201510630482 A CN 201510630482A CN 105134129 A CN105134129 A CN 105134129A
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Abstract
A gas extraction hole sealing method based on radial strong expansion comprises steps as follows: (1), determining the hole sealing position and the hole sealing depth; (2), determining a hole sealing material with four characteristics of good compactness, high strength, high expansibility and high permeability; (3), mounting a radial strong expansion extraction hole sealing device; (4), inserting the radial strong expansion extraction hole sealing device into a drill hole for expansion hole sealing; (5), connecting an orifice pipe and a gas extraction pipe for gas extraction after expansion of a polyurethane mixed liquid ladle ends. The adopted device is simple in structure, high in hole sealing speed and simple and convenient to operate, and a worker can rapidly and skillfully operate the device. The effective hole sealing length of an extraction drill hole is well increased; due to compactness of the hole sealing material, the hole sealing material can bear pressure difference between the drill hole and the outside roadway, and air in the roadway is prevented from entering the drill hole from the possible slit of the hole sealing material.
Description
Technical field
The present invention relates to a kind of coal bed gas extraction technical field, particularly relate to a kind of based on radial direction powerful expansion gas pumping method for sealing.
Background technology
Mine gas is one of principal element of serious threat Safety of Coal Mine Production.Gas explosion and Gas Outburst be the disaster in current colliery, cause many casualtiess and huge property loss every year.Therefore, prevention Gas Disaster is to reduction coal mining accident, coal industry healthy and sustainable development of guaranteeing the quality, significant.
Gas pumping is the important measures reducing mine gas emission rate, prevent gas explosion accident and control coal and gas prominent disaster.In addition, gas is the eco-friendly power source of high-quality, and the gas of extraction can be used as fuel, for civilian and generating, is also important industrial chemicals simultaneously.Therefore gas pumping has great importance.
At present, the sealing of hole mode of China's mine gas extraction mainly contains cement mortar sealing of hole and polyurethane sealing of hole.Though the cost of cement mortar sealing of hole is low, but the cycle of cement mortar sealing of hole is longer, and sealing of hole speed is extremely slow.After theing cement solidifies, meeting shrinkage strain, can form crack between hole wall and extraction hole.And cement mortar to fill up effect for the crack of rib bad, be difficult to refill crack.Under negative pressure extraction, a large amount of air is caused to enter extraction pipeline.Sealing of hole effect is bad.Polyurethane sealing of hole, it has good bonding force, and expansion rate is fast, and coefficient of foaming is high, and its setting rate is fast, becomes hard material after expansion.Polyurethane solidifies rear protection against the tide, ageing-resistant.Current polyurethane sealing of hole is widely used on gas pumping.
Above-mentioned traditional method for sealing also has following defect: first, there is no network analysis and predict roadway's sides and borehole wall coal and rock cranny development situation, scientifically determine sealed borehole length and hole sealing depth, but rule of thumb or relevant regulations determination sealed borehole length and hole sealing depth.Limit by hole-sealing technology, easily occur two extreme: or by sealing material in aperture, hole sealing depth is shallow, the bore portions that shutoff coal body is softer, cannot ensure effective sealed borehole length, causes that hole sealing depth is shallow, Gas pre-drainage concentration is low; , hole sealing depth and sealed borehole length excessive, cause sealing material to waste, sealing of hole cost improve, sealing of hole speed is slow.Secondly, the standard that neither one is suitable judges the compliance of sealing material nature, most sealing materials are subject to the impact of the factors such as the character of gas pressure, water-blocking effect, grouting pressure and material in borehole circumference fracture area itself, not easily penetrate in drill hole wall crack, still there is various microfissure and hole in borehole circumference coal, rock mass, in tunnel, air still by boring cracked district leakage around and can infiltrate in extraction pipeline.Finally, traditional hole sealing technology, sealing material free wxpansion in boring, does not retrain by borehole axial, does not have radial pressure, is difficult to the compactness ensureing sealing material self, causes sealing of hole not tight.
Summary of the invention
The present invention, in order to solve weak point of the prior art, provides that a kind of structure is simple, easy to operate, hole sealing depth is dark, sealing of hole is effective based on radial direction powerful expansion gas pumping method for sealing.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: based on radial direction powerful expansion gas pumping method for sealing, comprise the following steps:
(1), RFPA-3D numerical simulation software is applied, analyze roadway's sides and borehole wall surrounding coalmass crevasse situation, prediction roadway's sides plastically deforming area and boring annular unload the scope of trim ring, and then roadway's sides cranny development scope should be not less than according to the crack situation of hole wall surrounding coal body and sealed borehole length, determine sealing of hole position and hole sealing depth;
(2), according to borehole wall cranny development situation and hole wall crack feature, and original gas drainage borehole hole sealing technology and technique exist affect mash gas extraction concentration and effect factor, determine to have that self compactness is good, intensity is high, the sealing material of high-expansion and strong permeability four features;
(3), radial powerful expansion extraction hole sealing device is installed: radial powerful expansion extraction hole sealing device comprises gas pumping pipe and gas pumping floral tube, gas pumping floral tube rear end is connected with gas pumping pipe front end, gas pumping pipe outside is provided with the front fixed dam being annular from front to back successively, front moving stop, rear moving stop and rear fixed dam, front fixed dam is positioned at gas pumping pipe front end, rubber deformation cylindrical shell before gas pumping pipe outside is provided with between front fixed dam and front moving stop, rubber deformation cylindrical shell after gas pumping pipe outside is provided with between rear moving stop and rear fixed dam, front moving stop rear surface is provided with front rubber pad, rear moving stop front surface is provided with rear rubber pad, gas pumping pipe outside is provided with polyurethane mixed liquor bag between front rubber pad and rear rubber pad, the outer edge bending formation disk-like structure backward of front rubber pad, the outer edge bending formation disk-like structure forward of rear rubber pad,
(4), powerful for radial direction expansion extraction hole sealing device is inserted in boring, stops after gas pumping floral tube distance drilling orifice place 6-8m; There is bulging, close-burning polyurethane mixed liquor bag between front rubber pad and rear rubber pad, treat that polyurethane expands, axially the front moving stop of promotion and rear moving stop move forward and backward along gas pumping pipe respectively, under the stop of front fixed dam and rear fixed dam, front moving stop and rear moving stop promote front rubber deformation cylindrical shell respectively and rear rubber deformation cylindrical shell produces radial deformation, front rubber deformation cylindrical shell and rear rubber deformation cylindrical shell expanded radially shutoff slip casting section two ends; Polyurethane mixed liquor continues to expand, and due to the shutoff of front fixed dam and rear fixed dam, polyurethane filling, penetrates in coalmass crevasse, forms one section of polyurethane filling coal body, reach the object sealing extraction borehole and surrounding hole wall coal body disturbance crack;
(5), treat that the expansion of polyurethane mixed liquor bag is complete, orifice tube is connected with gas pumping pipe, carries out gas pumping.
Front fixed dam in step (3) and rear fixed dam are welded on gas pumping pipe respectively, and front moving stop and rear moving stop wear and be slidably connected on gas pumping pipe.
In step (3), polyurethane mixed liquor bag is bundled on the gas pumping pipe between front rubber pad and rear rubber pad.
Adopt technique scheme, the present invention designs according to following principle: first, the hole wall coalmass crevasse situation of both sides, analysis and prediction tunnel and boring surrounding, and the growth of hole wall coalmass crevasse is the result of geostatic stress superposition.Earth history period, coal seam, through repeated tectonic movements, produces a large amount of initial fissure.Stress of primary rock redistribution in coal seam in tunnelling process, there is stress concentration phenomenon in roadway surrounding rock.When surrouding rock stress is less than coal mass strength, coal seam does not occur destroy and be in elastic stage; When surrouding rock stress is greater than coal mass strength, roadway surrounding rock can produce plastic strain, expands, occur plastically deforming area to certain limit from tunnel-surrounding to country rock depths.Secondly, sealing of hole main purpose be extraction pipeline and drill hole wall are formed space in can play and effectively fill and sealing function, and can infiltrate in the crack of boring rib, play tight plugging effect better, and according to hole wall coalmass crevasse feature, the several main nature and characteristic of sealing material demand fulfillment can be drawn: 1, compactness is good, material internal structure is tight, without Micro porosity and crack.2, intensity is high, is not easily compressed or produces crack when material is subject to larger effect of stress.3, high-expansion, can expand on high power ground, can be full of boring, and produce radial pressure under axial constraint.4, strong permeability, easily overcomes the barrier effect of gas pressure, water-blocking effect in Fractured zone around boring in coal body, permeates gradually, realize shutoff crack maximum effect in boring around crack.Finally, use the radial powerful hole sealing technology expanded, devise axial constraint device at sealing material two ends, sealing material axial expansion is obstructed, produces very large radial pressure, make sealing material that powerful expanded radially occur, in abundant infiltration hole wall coalmass crevasse, reach good sealing of hole effect.
Front rubber deformation cylindrical shell in the present invention and rear rubber deformation cylindrical shell are soft rubber, and be squeezed easily distortion.Front moving stop and rear moving stop can move by axial compression.Front moving stop, rear moving stop, front fixed dam and rear fixed dam are annular, pass in the middle of gas pumping Guan Congqi.And the diameter of front moving stop, rear moving stop, front fixed dam and rear fixed dam is slightly less than bore diameter.Front moving stop and rear moving stop are fixed with the front rubber pad of annular and rear rubber pad respectively, and the diameter of front rubber pad and rear rubber pad is slightly larger than the diameter of holing, in case polyurethane flows out.
The present invention adopts polyurethane to carry out sealing of hole as sealing material to coal mine gas drainage device.Because polyurethane has, expansion rate is fast, viscosity large, and has good compactness after solidifying.The present invention can be good at the axial expansion retraining polyurethane.Because polyurethane expansion effect is fairly obvious, polyurethane by under shutoff at front fixed dam and rear fixed dam, self expands and can enter coalmass crevasse, filling hole and coal body male and fomale(M&F) in splitting, expansion hole wall.Combine closely with boring surrounding medium after the sufficient expanded radially solidification of polyurethane, final thoroughly shutoff gas crack passage.Under negative pressure extraction, due to the compactness of polyurethane, a large amount of micro-crack, pore channel can well be formed in the coal seam of shutoff in boring useful effect radius region, and can not grow further along with extraction crack.
Compared with method of pore sealing used before, the present invention has the following advantages:
1, according to coal and rock porous dehiscence gap structure and mechanical property, strata behaviors rule, coal extraction gas technology and technique, in conjunction with RFPA-3D results of numerical simulation, both sides, analysis and prediction tunnel and the hole wall coalmass crevasse situation of boring surrounding, determine that plastically deforming area, both sides, tunnel and boring annular unload the scope of trim ring.Hole wall cranny development scope should be not less than according to the crack situation of hole wall coal body and sealed borehole length, determine its sealed borehole length and hole sealing depth.Cross the serious coal petrography plastically deforming area scope that both sides, tunnel are grown, only at borehole wall fissure zone sealing of hole, the effect that can improve sealing of hole can save sealing material again.
2, according to the main character feature that sealing material need meet, the sealing of hole effect of different sealing material can be judged, contribute to selecting more suitably sealing material, can enter better and block hole wall coal, rock cranny, reach better sealing of hole effect.
3, sealing material retrains by borehole axial in boring, produce radial pressure, make sealing material that powerful expanded radially occur, can either ensure that sealing material fully infiltrates in hole wall coal, rock cranny, obtain good shutoff coal petrography crack effect, the compactness of sealing material self can be ensured again, reach good sealing of hole effect.
In sum, front rubber deformation cylindrical shell and rear rubber deformation cylindrical shell radial deformation after being subject to axial force expands, and can carry out shutoff very well to the two ends of polyurethane filling coal body.Polyurethane, under the axis restriction of front rubber deformation cylindrical shell and rear rubber deformation cylindrical shell, can fill gas crack passage fully.And ensure the expanded radially of polyurethane, thorough shutoff gas crack passage.The present invention well can refill crack.Under negative pressure extraction, the present invention will make crack further grow due to extraction.
The apparatus structure that the present invention adopts is simple, and sealing of hole speed is fast, easy and simple to handle, can make very fast skilled of workman.The present invention improves effective sealed borehole length of extraction borehole well, and due to the compactness of sealing material, can bear boring and the pressure differential in extraneous tunnel completely, prevent the crack that in tunnel, air may be existed by sealing material self from entering in boring.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 be in Fig. 1 A-A to sectional view;
Fig. 3 is the schematic diagram after polyurethane expansion sealing of hole of the present invention;
Fig. 4 be in Fig. 3 B-B to sectional view.
Detailed description of the invention
Of the present invention based on radial direction powerful expansion gas pumping method for sealing, comprise the following steps:
(1), this test site is selected in level north, Hebi Coal Industry Group three ore deposit four wing and assists return airway.This region belongs to coal and gas prominent hazardous area, the thick 6.8m of average coal, seam inclination 23 ° ~ 26 °; Boring controls seat earth absolute altitude between-580 and-620m, and ground level is+138.8m, buried depth 718.8m ~ 758.8m.Vertical Permeability Coefficent in Coal Seam is 3.60 ~ 7.15m2/MPa2d, and gas bearing capacity is 12 ~ 15m3/t.
First, the cranny development scope analyzing the rib existence of on-the-spot tunnel, to determine hole sealing depth, adopts RFPA-3D method for numerical simulation, according to on-the-spot real data, analyzes the cranny development scope of tunnel rib.Model test piece is cuboid, and size length × wide × height is 26 × 4 × 10m, cell 325 × 50 × 125, totally 2031250 cells.Poisson's ratio 0.27, average degree m=2.5, compressive strength gets 15MPa, modulus of elasticity=11000MPa, coal body density 1.41 × 10
-5g/mm
3.Model surrounding and bottom adopt displacement constraint, and displacement is that 0(and borderline unit are not moved), top is free boundary, adopts uniformly distributed load to load, and on vertical direction, imposed load 10MPa simulates the vertically stress that buried depth is about 500m.Be initially complete country rock, under balancing of stresses, excavate tunnel (in a model, there is an arched tunnel run through position, wide 2m, high 3m), after periphery release is stable, in side excavation extraction boring, again calculate release situation.Can draw, due to the excavation in tunnel and creeping into of extraction hole, destroy primary stress field, in peripheral rock, stress will change, and the change of minimum principal stress is particularly evident.Can find out that from coloured picture tunnel surrounding has the scope of significant change probably at 1-2m, the excavation in extraction hole makes this lateral stress reduce further, but country rock relief range does not significantly expand, and obvious distressed zone is about 2m.Meanwhile, have obvious stress to reduce in extraction hole surrounding, but influence basin is very little.Due to the excavation in tunnel and creeping into of extraction hole, all there is significant change in 3 main stress bares, the change of minimum principal stress is maximum.In the scope near tunnel 4-6m, stress has significant change; Along with the increase of distance, surrouding rock stress reverts to virgin stress gradually.Excavation reaches 8-10m to the influence basin of surrouding rock stress disturbance is maximum.Region in stress envelope beyond 8m, surrouding rock stress value is substantially overlapping with virgin stress value.Roadway excavation is that in 4-6m, 2m, release effect is the most remarkable for effective relief range of surrouding rock stress, and change is apparent that minimum principal stress value (particularly position near tunnel) the most.Find from above figure, roadway excavation has control action for relief range, substantially determine the size of relief range, and the excavation in extraction hole can reduce the stress in country rock further, stress is played to the effect of an overall range of decrease, for the increase of relief range without obvious effect.The above analysis, the size of relief range is primarily of roadway excavation process control, the impact that the excavation in extraction hole changes for relief range is little, but the entire lowering of stress can be caused within the scope of extraction hole, tunnel rib relief range is generally at 4-6m, and stress disturbance scope can reach about 8m.Can determine that sealed borehole length should be not less than the hole wall cranny development scope of 8m thus;
(2), according to borehole wall cranny development situation and hole wall crack feature, and original gas drainage borehole hole sealing technology and technique exist affect mash gas extraction concentration and effect factor, determine to have that self compactness is good, intensity is high, the sealing material of high-expansion and strong permeability four features;
(3), radial powerful expansion extraction hole sealing device is installed: as Figure 1-Figure 4, radial powerful expansion extraction hole sealing device comprises gas pumping pipe 1 and gas pumping floral tube 2, gas pumping floral tube 2 rear end is connected with gas pumping pipe 1 front end, gas pumping pipe 1 outside is provided with the front fixed dam 3 being annular from front to back successively, front moving stop 4, rear moving stop 5 and rear fixed dam 6, front fixed dam 3 is positioned at gas pumping pipe 1 front end, rubber deformation cylindrical shell 7 before gas pumping pipe 1 outside is provided with between front fixed dam 3 and front moving stop 4, rubber deformation cylindrical shell 8 after gas pumping pipe 1 outside is provided with between rear moving stop 5 and rear fixed dam 6, front moving stop 4 rear surface is provided with front rubber pad 9, rear moving stop 5 front surface is provided with rear rubber pad 10, gas pumping pipe 1 outside is provided with polyurethane mixed liquor bag 11 between front rubber pad 9 and rear rubber pad 10, front rubber pad 9, the outer edge bending formation disk-like structure backward of front rubber pad 9, the outer edge bending formation disk-like structure forward of rear rubber pad 10,
(4), be inserted in boring by powerful for radial direction expansion extraction hole sealing device, gas pumping floral tube 2 stops apart from after drilling orifice place 6-8m; There is bulging, close-burning polyurethane mixed liquor bag 11 between front rubber pad 9 and rear rubber pad 10, treat that polyurethane expands, axially the front moving stop 4 of promotion and rear moving stop 5 move forward and backward along gas pumping pipe 1 respectively, under the stop of front fixed dam 3 and rear fixed dam 6, front moving stop 4 and rear moving stop 5 promote front rubber deformation cylindrical shell 7 respectively and rear rubber deformation cylindrical shell 8 produces radial deformation, front rubber deformation cylindrical shell 7 and rear rubber deformation cylindrical shell 8 expanded radially shutoff slip casting section two ends; Polyurethane mixed liquor continues to expand, and due to the shutoff of front fixed dam 3 and rear fixed dam 6, polyurethane filling, penetrates in coalmass crevasse, forms one section of polyurethane filling coal body, reach the object sealing extraction borehole and surrounding hole wall coal body disturbance crack;
(5), to treat that polyurethane mixed liquor bag 11 expands complete, is connected by orifice tube, carries out gas pumping with gas pumping pipe 1.
Front fixed dam 3 in step (3) and rear fixed dam 6 are welded on gas pumping pipe 1 respectively, and front moving stop 4 and rear moving stop 5 wear and be slidably connected on gas pumping pipe 1.
In step (3), polyurethane mixed liquor bag 11 is bundled on the gas pumping pipe 1 between front rubber pad 9 and rear rubber pad 10.
Front rubber deformation cylindrical shell 7 and rear rubber deformation cylindrical shell 8 are soft rubber, and be squeezed easily distortion.Front moving stop 4 and rear moving stop 5 can move by axial compression.Front moving stop 4, rear moving stop 5, front fixed dam 3 and rear fixed dam 6 are annular, and gas pumping pipe 1 passes from its centre.And the diameter of front moving stop 4, rear moving stop 5, front fixed dam 3 and rear fixed dam 6 is slightly less than bore diameter.Rubber pad 9 and rear rubber pad 10 before front moving stop 4 and rear moving stop 5 are fixed with annular respectively, the diameter of front rubber pad 9 and rear rubber pad 10 is slightly larger than the diameter of holing, in case polyurethane flows out.
The present invention adopts polyurethane to carry out sealing of hole as sealing material to coal mine gas drainage device.Because polyurethane has, expansion rate is fast, viscosity large, and has good compactness after solidifying.The present invention can be good at the axial expansion retraining polyurethane.Because polyurethane expansion effect is fairly obvious, polyurethane by under shutoff at front fixed dam 3 and rear fixed dam 6, self expands and can enter coalmass crevasse, filling hole and coal body male and fomale(M&F) in splitting, expansion hole wall.Combine closely with boring surrounding medium after the sufficient expanded radially solidification of polyurethane, final thoroughly shutoff gas crack passage.Under negative pressure extraction, due to the compactness of polyurethane, a large amount of micro-crack, pore channel can well be formed in the coal seam of shutoff in boring useful effect radius region, and can not grow further along with extraction crack.
The sealing of hole course of work of the present invention is as follows: step (1): by appropriate polyurethane mixed liquor bag 11, be bundled on the gas pumping pipe 1 between front rubber deformation cylindrical shell 7 and rear rubber deformation cylindrical shell 8.Step (2): by the present invention by the boring 14 of putting into issured coall 13 after forward direction, stop after approximately going deep into 6 ~ 8m.Step (3): treat that polyurethane mixed liquor bag 11 expands complete, orifice tube is connected with gas pumping pipe 1, carries out gas pumping.
The present embodiment not does any pro forma restriction to shape of the present invention, material, structure etc.; every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all belong to the protection domain of technical solution of the present invention.
Claims (3)
1., based on radial direction powerful expansion gas pumping method for sealing, it is characterized in that: comprise the following steps:
(1), RFPA-3D numerical simulation software is applied, analyze roadway's sides and borehole wall surrounding coalmass crevasse situation, prediction roadway's sides plastically deforming area and boring annular unload the scope of trim ring, and then roadway's sides cranny development scope should be not less than according to the crack situation of hole wall surrounding coal body and sealed borehole length, determine sealing of hole position and hole sealing depth;
(2), according to borehole wall cranny development situation and hole wall crack feature, and original gas drainage borehole hole sealing technology and technique exist affect mash gas extraction concentration and effect factor, determine to have that self compactness is good, intensity is high, the sealing material of high-expansion and strong permeability four features;
(3), radial powerful expansion extraction hole sealing device is installed: radial powerful expansion extraction hole sealing device comprises gas pumping pipe and gas pumping floral tube, gas pumping floral tube rear end is connected with gas pumping pipe front end, gas pumping pipe outside is provided with the front fixed dam being annular from front to back successively, front moving stop, rear moving stop and rear fixed dam, front fixed dam is positioned at gas pumping pipe front end, rubber deformation cylindrical shell before gas pumping pipe outside is provided with between front fixed dam and front moving stop, rubber deformation cylindrical shell after gas pumping pipe outside is provided with between rear moving stop and rear fixed dam, front moving stop rear surface is provided with front rubber pad, rear moving stop front surface is provided with rear rubber pad, gas pumping pipe outside is provided with polyurethane mixed liquor bag between front rubber pad and rear rubber pad, the outer edge bending formation disk-like structure backward of front rubber pad, the outer edge bending formation disk-like structure forward of rear rubber pad,
(4), powerful for radial direction expansion extraction hole sealing device is inserted in boring, stops after gas pumping floral tube distance drilling orifice place 6-8m; There is bulging, close-burning polyurethane mixed liquor bag between front rubber pad and rear rubber pad, treat that polyurethane expands, axially the front moving stop of promotion and rear moving stop move forward and backward along gas pumping pipe respectively, under the stop of front fixed dam and rear fixed dam, front moving stop and rear moving stop promote front rubber deformation cylindrical shell respectively and rear rubber deformation cylindrical shell produces radial deformation, front rubber deformation cylindrical shell and rear rubber deformation cylindrical shell expanded radially shutoff slip casting section two ends; Polyurethane mixed liquor continues to expand, and due to the shutoff of front fixed dam and rear fixed dam, polyurethane filling, penetrates in coalmass crevasse, forms one section of polyurethane filling coal body, reach the object sealing extraction borehole and surrounding hole wall coal body disturbance crack;
(5), treat that the expansion of polyurethane mixed liquor bag is complete, orifice tube is connected with gas pumping pipe, carries out gas pumping.
2. according to claim 1 based on radial direction powerful expansion gas pumping method for sealing, it is characterized in that: the front fixed dam in step (3) and rear fixed dam are welded on gas pumping pipe respectively, front moving stop and rear moving stop wear and are slidably connected on gas pumping pipe.
3. according to claim 1 based on radial direction powerful expansion gas pumping method for sealing, it is characterized in that: in step (3), polyurethane mixed liquor bag is bundled on the gas pumping pipe between front rubber pad and rear rubber pad.
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| CN108593174A (en) * | 2018-05-08 | 2018-09-28 | 安徽理工大学 | A kind of coal and rock mining induced stress monitoring backpack body |
| CN108593174B (en) * | 2018-05-08 | 2024-01-02 | 安徽理工大学 | Coal rock mass mining stress monitoring inclusion |
| CN108468529A (en) * | 2018-05-23 | 2018-08-31 | 山西潞安环保能源开发股份有限公司常村煤矿 | A kind of coal mine gas extraction drill hole pressure wind sealing method and device |
| CN110529173A (en) * | 2019-08-26 | 2019-12-03 | 河南工程学院 | A kind of straight plug integration gas drainage device and pumping method |
| CN111561291A (en) * | 2020-05-06 | 2020-08-21 | 太原理工大学 | Double-layer extrusion type hole sealing device and method for gas extraction drill hole |
| CN112196498A (en) * | 2020-09-28 | 2021-01-08 | 河南理工大学 | Cross-layer drilling separated type whole-course gas extraction hole sealing device |
| CN112196498B (en) * | 2020-09-28 | 2022-09-02 | 河南理工大学 | Cross-layer drilling separated type whole-course gas extraction hole sealing device |
| CN113719255A (en) * | 2021-09-17 | 2021-11-30 | 河南理工大学 | Top directional long-drill-hole fractured zone gas extraction hole sealing method |
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