CN203430466U - Drill hole sealing device for gas extraction of coal mine - Google Patents

Drill hole sealing device for gas extraction of coal mine Download PDF

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Publication number
CN203430466U
CN203430466U CN201320551840.8U CN201320551840U CN203430466U CN 203430466 U CN203430466 U CN 203430466U CN 201320551840 U CN201320551840 U CN 201320551840U CN 203430466 U CN203430466 U CN 203430466U
Authority
CN
China
Prior art keywords
drill hole
pipe
hole
drainage tube
gas extraction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201320551840.8U
Other languages
Chinese (zh)
Inventor
徐刚
李树刚
张天军
丁洋
马瑞峰
王宁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian University of Science and Technology
Original Assignee
Xian University of Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xian University of Science and Technology filed Critical Xian University of Science and Technology
Priority to CN201320551840.8U priority Critical patent/CN203430466U/en
Application granted granted Critical
Publication of CN203430466U publication Critical patent/CN203430466U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model relates to a drill hole sealing device for gas extraction of a coal mine. One end of an extraction pipe in inserted into a drill hole; the front end of the extraction pipe is provided with a screen pipe; the end of the extraction pipe is provided with a tubular cloth bag; one end of the hole opening of the drill hole is provided with a rubber retainer ring; the extraction pipe, a grouting pipe and an exhaust pipe penetrate the rubber retainer ring to be inserted into the drill hole. According to the drill hole sealing device for the gas extraction of the coal mine, the front end is provided with the screen pipe so as to avoid the coal in the drill hole from entering into the extraction pipe to block an extraction pipeline; the front portion of the drill hole is sealed by the polyurethane, the middle portion and the rear portion are sealed by grouting materials and the rubber retainer ring respectively, and accordingly the usage amount of the polyurethane can be reduced by more than 60%; the grouting pressure in the middle can reach 2 MPa and accordingly cracks caused by contraction deformation of the grouting materials can be prevented; pulp-out holes are formed in the grouting pipe, the hole opening is provided with an exhaust hole, and accordingly the integral space can be filled with the grouting materials uniformly, hole sealing materials can be closely combined with the drill hole wall, and the coal seam gas extraction drill hole can be sealed; the structure is simple, the cost is economical, the born pressure is high, and the sealing effect is good.

Description

Coal mine gas extraction drill hole hole sealing device
Technical field
The utility model relates to coal bed gas extraction technical field, particularly a kind of coal mine gas extraction drill hole hole sealing device.
Background technology
China is the country of coal production maximum in the world, and more than 90% coal derives from pit mining, and China is also the most serious country of coal mine gas disaster in the world simultaneously.Along with the increasing to the prolongation of the increase of coal demand, old mine service-life, mining dynamics and intensity, the mine gas disaster of China is on the rise, and has seriously affected the raising of mine economic benefit.The basic measures that coal bed gas extraction is administered as mine gas are widely used in ensureing Safety of Coal Mine Production.
The key of coal mine gas drainage is at the sealing problem of mash gas pumping drilling, and the quality of sealing quality directly has influence on the effect of gas pumping.At present, the sealing of coal mine gas extraction drill hole comprises polyurethane sealing hole and two kinds of methods of cement mortar sealing of hole.Polyurethane sealing of hole causes sealing tight not because polyurethane foam is inhomogeneous, the phenomenon that leaks air, and because polyurethane cost is higher, economical not.Cement mortar sealing of hole skewness during due to slip casting, and easily produce shrinkage strain during cement setting also easily produces crack between sealing material and borehole wall, while causing gas pumping, gas leak phenomenon occurs and affects the effect of gas pumping.
Summary of the invention
The purpose of this utility model is to solve above shortcomings in prior art, and a kind of coal mine gas extraction drill hole hole sealing device that is applicable to mash gas pumping drilling sealing of hole is provided.
The utility model adopts following technical scheme: coal mine gas extraction drill hole hole sealing device, it is characterized in that comprising screen casing (2), drainage tube (4), Grouting Pipe (7), stack (6), cylindrical cloth bag (3), rubber back-up ring (5) and polyurethane casting resin, insert in boring (1) drainage tube (4) one end, the other end is positioned at outside aperture, drainage tube (4) front end is provided with screen casing (2), screen casing is provided with several suction holes on (2), drainage tube (4) is being provided with cylindrical cloth bag (3) near screen casing (2) one end, diameter after the complete bulging of cylindrical cloth bag (3) is greater than the diameter of coal bed drilling (1), boring (1) one end, aperture is provided with rubber back-up ring (6), drainage tube, Grouting Pipe (7) and stack (6) insert in boring (1) through rubber back-up ring (5).Grouting Pipe (7) is provided with several slurry outlets.
The two ends of cylindrical cloth bag (3) by wire binding on drainage tube (4);
Cylindrical cloth bag is provided with slide fastener on (3).
Grouting Pipe (7) is deep into drainage tube (4) 2/3~4/5 places; Stack (8) is through rubber back-up ring (5) 20~30cm.
The beneficial effects of the utility model are: coal mine gas extraction drill hole hole sealing device front end is screen casing, can avoid coal cinder in boring to enter and in drainage tube, stop up extraction pipeline; The shutoff of the anterior employing of boring polyurethane, middle part and rear portion adopt respectively injecting paste material and the shutoff of rubber back-up ring, can reduce polyurethane use amount more than 60%; Middle part grouting pressure can reach 2MPa, can prevent that injecting paste material from producing crack because of shrinkage strain; And in Grouting Pipe, be furnished with slurry outlet, in aperture, be provided with steam vent, can make injecting paste material evenly be full of whole space, can make sealing material and borehole wall combine closely, realize the sealing of coal bed gas extraction boring.The feature that there is simple in structure, cost economy, bears the high and good sealing effect of pressure.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
In figure: 1. hole, 2. screen casing, 3. cylindrical cloth bag, 4. drainage tube, 5. rubber back-up ring, 6. stack, 7. Grouting Pipe.
The specific embodiment:
With reference to the accompanying drawings and in conjunction with example the specific embodiment of the present utility model is described in further detail:
Referring to Fig. 1, coal mine gas extraction drill hole hole sealing device, consists of screen casing 2, cylindrical cloth bag 3, drainage tube 4, rubber back-up ring 5, stack 6 and Grouting Pipe 7; Insert in boring 1 drainage tube 4 one end, and the other end is positioned at outside aperture, and drainage tube 4 front ends are provided with screen casing 2, and 1 diameter 115mm holes; The long 12m of hole sealing device, the long 2m of anterior screen casing 2, diameter 90mm; Drainage tube 4 is being provided with cylindrical cloth bag 3 near screen casing 2 one end, and cylindrical cloth bag 3 length are 3m, and the diameter after bulging is greater than the diameter of coal bed drilling 1 completely; 1 one end, aperture of holing is provided with rubber back-up ring 6, and drainage tube 4, Grouting Pipe 7 and stack 6 insert in boring 1 through rubber back-up ring 5, and drainage tube 4 length are 10m, diameter 70mm; Grouting Pipe 7 length 8m, diameter 30mm; Stack 6 length 1m, diameter 20mm, through the about 20cm of rubber back-up ring 5; Rubber back-up ring 5 thickness 20cm, diameter 110mm.
On screen casing 2, be provided with the suction hole that several diameters are 10mm; In Grouting Pipe 7, be furnished with the slurry outlet that several diameters are 10mm; The two ends of cylindrical cloth bag 3 on drainage tube, are provided with slide fastener in cylindrical cloth bag 3 by wire binding.
In concrete enforcement, for fear of coal cinder, stop up drainage tube 4, be provided with screen casing 2, and on screen casing 2, be furnished with the suction hole that several diameters are 10mm; In order to make evenly complete being distributed between boring 1 and drainage tube 4 of slurries, Grouting Pipe 7 is provided with the slurry outlet that several diameters are 10mm; In order to make slurries fully fill crack in boring 1, stack 6 is set.
In sealing of hole process, first pull open the slide fastener in cylindrical cloth bag 3, pack polyurethane casting resin Quick uniform into cylindrical cloth bag 3, then strain the slide fastener in cylindrical cloth bag 3, rapidly hole sealing device is sent in hole, the polyurethane casting resin in cylindrical cloth bag 3 can form inner shutoff block plate after expanding; Then by Grouting Pipe 7, in slip casting chamber, carry out slip casting, find that stack 6 returns slurry and can cut out the gate valve on exhaust pipe mouth, carry out band pressure grouting, grouting pressure is 2MPa, to improve the leakproofness of boring; Finally drainage tube 4 is connected with extraction pipeline, carries out coal bed gas extraction.
Although above the present invention is had been described in detail, the invention is not restricted to this, those skilled in the art of the present technique can carry out various modifications according to principle of the present invention.Therefore, all modifications of doing according to the principle of the invention, all should be understood to fall into protection scope of the present invention.

Claims (4)

1. coal mine gas extraction drill hole hole sealing device, it is characterized in that comprising screen casing (2), drainage tube (4), Grouting Pipe (7), stack (6), cylindrical cloth bag (3), rubber back-up ring (5) and polyurethane casting resin, it is characterized in that: insert in boring (1) drainage tube (4) one end, the other end is positioned at outside aperture, drainage tube (4) front end is provided with screen casing (2), screen casing is provided with several suction holes on (2), drainage tube (4) is being provided with cylindrical cloth bag (3) near screen casing (2) one end, diameter after the complete bulging of cylindrical cloth bag (3) is greater than the diameter of coal bed drilling (1), boring (1) one end, aperture is provided with rubber back-up ring (6), drainage tube, Grouting Pipe (7) and stack (6) insert in boring (1) through rubber back-up ring (5), and Grouting Pipe (7) is provided with several slurry outlets.
2. coal mine gas extraction drill hole hole sealing device according to claim 1, is characterized in that: the two ends of cylindrical cloth bag (3) by wire binding on drainage tube (4).
3. coal mine gas extraction drill hole hole sealing device according to claim 1, is characterized in that: cylindrical cloth bag is provided with slide fastener on (3).
4. coal mine gas extraction drill hole hole sealing device according to claim 1, is characterized in that; Grouting Pipe (7) is deep into drainage tube (4) 2/3~4/5 places; Stack (8) is through rubber back-up ring (5) 20~30cm.
CN201320551840.8U 2013-09-05 2013-09-05 Drill hole sealing device for gas extraction of coal mine Expired - Fee Related CN203430466U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320551840.8U CN203430466U (en) 2013-09-05 2013-09-05 Drill hole sealing device for gas extraction of coal mine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320551840.8U CN203430466U (en) 2013-09-05 2013-09-05 Drill hole sealing device for gas extraction of coal mine

Publications (1)

Publication Number Publication Date
CN203430466U true CN203430466U (en) 2014-02-12

Family

ID=50059511

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201320551840.8U Expired - Fee Related CN203430466U (en) 2013-09-05 2013-09-05 Drill hole sealing device for gas extraction of coal mine

Country Status (1)

Country Link
CN (1) CN203430466U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104863625A (en) * 2014-02-21 2015-08-26 王玉杰 Method for extracting gas from underground coal mine by adopting internal support pipe through drilling along coal seam
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104863625A (en) * 2014-02-21 2015-08-26 王玉杰 Method for extracting gas from underground coal mine by adopting internal support pipe through drilling along coal seam
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

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C14 Grant of patent or utility model
GR01 Patent grant
EXPY Termination of patent right or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140212

Termination date: 20140905