CN102748065A - Method for extracting gas of blank zone of working face with large mining length - Google Patents
Method for extracting gas of blank zone of working face with large mining length Download PDFInfo
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- CN102748065A CN102748065A CN2012102657606A CN201210265760A CN102748065A CN 102748065 A CN102748065 A CN 102748065A CN 2012102657606 A CN2012102657606 A CN 2012102657606A CN 201210265760 A CN201210265760 A CN 201210265760A CN 102748065 A CN102748065 A CN 102748065A
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Abstract
The invention relates to a method for extracting gas of a blank zone of a working face with large mining length. Aiming at the gas prevention and control blank zone in a middle region of the stope working face with the large mining length, a middle bottom-position roadway is creatively adopted to perform orientation drilling and order kerf to a high voltage pulse water jet region of a coal seam to improve air permeability of a large coal seam, and gas converges in the bottom-position roadway along cracked gap channels and then are transported to a gas extracting pump station through pipelines. By means of the method, the drilling and the kerf are performed in the bottom-position roadway of the blank zone of the stope working face with the large mining length through high voltage pulse water jet. By changing pressure and flow of a high-pressure pump and a gas-water-residue separating device, the gas is extracted controllably and orderly, gas content and gas pressure are reduced, power conditions causing outburst of coal and the gas are weakened, local ultra-limitation of the gas is effectively avoided, dangerousness of the outburst of the coal and the gas is eliminated regionally, and disaster is effectively contained.
Description
Technical field
The present invention relates to a kind of gas pumping method, especially relate to a kind of to adopting long work plane blank tape gas pumping method greatly.
Background technology
Mining area, table mountain is one of 13 large-scale coal bases, the whole nation, 45 safe key monitoring mining areas, and it is big that mining area, table mountain has mining depth, and coal seam group mining, the high deep regional of gas bearing capacity reach 25-30m
3/ t, characteristics such as outburst hazard is big, gas permeability of coal seam is low and but territory, topping exploiting field scope is little.Along with the increase of mining depth and the raising of output, it is more and more nervous that relation is taken in digging.Gas control comparison efficient ways is in advance construction area to be carried out the preparatory extraction of gas, reduces the content and the gas pressure of coal-bed gas, weakens the outstanding dynamic condition of coal and gas, effectively contains the generation of disaster.Under existence conditions, improve and to adopt long stope gas pumping efficient greatly, shorten the gas pumping time, be to guarantee that digging is taken over to concern important means.
The protrusion-dispelling technical measures mainly are divided into regional protrusion-dispelling and local protrusion-dispelling two aspects, and regional protrusion-dispelling technical measures comprise the exploitation topping and take out coal-bed gas in advance.Take out in advance that coal-bed gas comprises mainly that the down-hole layer-through drilling is taken out in advance and take out in advance and surface well is taken out etc. in advance along layer boring.For adopting long stope greatly, because work plane is longer, along layer extraction drilling construction difficulty, drilling depth is limited, and the work plane central region of being everlasting forms gas drainage under suction blank tape, effectively extinction.In view of flat coal field composite power serious disaster, and the unprotect layer can adopt, and under existence conditions, improves and adopts long stope gas pumping efficient greatly, shortens the gas pumping time, is on the one hand to guarantee that digging is taken over to concern important means; On the other hand; Having researched and developed to novelty a cover can be efficiently, economy, safe and reliable regional protrusion-dispelling technology; Effectively the difficult problem of gas drainage under suction of long stope central region is adopted in solution greatly, and long stope is efficient mines and other operations of mine have significance without any confusion to realizing adopting greatly.
Summary of the invention
The present invention solves that existing in prior technology is adopted long stope greatly because work plane is longer, and along layer extraction drilling construction difficulty, drilling depth is limited, and the work plane middle part forms blank tape, the technical problem that this zone gas can't effectively discharge etc.; Providing a kind of can increase gas permeability of coal seam to the whole release in coal seam, exploiting field (crowd), and effectively the gas pumping method and the device of long work plane central region outburst hazard adopted in elimination greatly.
Above-mentioned technical problem of the present invention mainly is able to solve through following technical proposals:
A kind of pumping method of adopting long stope central region gas pumping blank tape greatly that solves is characterized in that, may further comprise the steps:
Step 1, floor strata is provided with lane, position, an end below the inner working face of exploiting field, and lane, position, the end is positioned on the perpendicular bisector of machine lane and air way line, and the minimum safe distance of the distance H in nearest coal seam greater than " safety code " requirement arrived in lane, position, the end;
Step 2; Bearing of trend is whenever laid drill site at a distance from 5 ~ 20m (according to coal seam and gas situation) at its top along lane, position, the end; In drill site, lay fan drilling according to the scope of blank tape along the stope direction, i.e. the 1st drill site, the 2nd drill site N drill site, the drill site internal drilling requires: the boring of sector both sides must cover the four corner of nearest coal seam blank tape; Adjacent two borings are in that the spacing M in coal seam is smaller or equal to the radius of influence R of 2 times of rig cut surfaces farthest from lane, position, the end, and promptly M is smaller or equal to 2R;
The present invention is through arranging the lane up-hole of position, the end in the stope central floor panel; And adopt high-pressure water jet to bore and cut integration apparatus; The coal seam bored cut; Increase the gas permeability of coal seam and the crack radius of influence, effectively long work plane central region outburst hazard is adopted in elimination greatly, guarantees the safe back production of work plane.
A kind of being directed against above-mentioned adopted long work plane blank tape gas pumping method greatly, and in the described step 2, rig is holed when the coal seam advances; After creeping into a drilling rod, close foot valve, stop rig and creep into, rotate; After adding drilling rod, continue to advance, until reaching predetermined boring point place.
A kind of being directed against above-mentioned adopted long work plane blank tape gas pumping method greatly, in the described step 5, when carrying out mash gas extraction, adds a gas pulp separator at the place, mash gas extraction aperture of drilling well groove and blocks the mash gas aperture, and carry out the gas slag simultaneously and separate.
Therefore, the present invention has following advantage: increase the gas permeability of coal seam and the crack radius of influence.In the boring procedure, can to gas gush out to regulate and control, avoid gas exceeding limit in the tunnel.Effectively long work plane central region outburst hazard is adopted in elimination greatly, avoids pumping blind zone.
Description of drawings
Accompanying drawing 1 is the operating principle sketch map in the embodiment of the invention.
Accompanying drawing 2 is sketch mapes of rig front end high water jet slot among the present invention.
Accompanying drawing 3 is high-voltage pulse water-jet cutting system schematic representation of apparatus of using among the present invention.
The specific embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically technical scheme of the present invention.
Embodiment:
As shown in Figure 1, in the embodiments of the invention, the vertical distance of the line of lane, position, the end and machine lane and air way is that H is the maximum length of drilling rod, and operating procedure is following:
1, prepares coal-bed gas extraction device condition of work: the firm and sealing of each connecting line in the inspection high-pressure water jet coal-bed gas extraction device;
2, start high-pressure pump 2: high-pressure pump working flow 120L/min, operating pressure is 5 ~ 40MPa;
3, open foot valve 5: foot-operated reversal valve in this system, mainly play regulating system pressure, conversion High-Pressure Water to effect, make system's operation safer, simple.When foot switch is in closed condition, the water under high pressure that flows out from high-pressure pump flows back to high-pressure pump from the overfall of foot switch; When foot switch was in opening, water under high pressure flowed out to nozzle from delivery port and carries out joint-cutting work, when the cutting gas emission is big, can weaken cutting intensity through foot-operated reversal valve, and then control coal body gas emission;
4, rig 9 advances, holes: the axial oscillation nozzle produces polyphase oscillation cutting and broken coal seam earlier, and in the coal seam, creeps into pilot hole, through the cutter on the drill bit; Pilot hole is expanded into the gas pumping hole; After creeping into a drilling rod 10, close foot valve, stop rig and creep into, rotate; Add drilling rod, repeat 2,3;
When 5, rig reaches the predetermined coal seam degree of depth, stop to advance, cut automatic switch 11 through the diameter of axle to brill, the rising pump pressure surpasses the threshold of conversion automatically, is rotated slot; The grooving time is 0.5 ~ 20min, whenever cuts a groove, stops rig 9 rotations, closes foot valve 5;
6, repeat said process, until end.
Introduce the device that the present invention down uses below:
The present invention produces polyphase oscillation jet crushing coal petrography through upwards holing in lane, intersole position through the axial oscillation nozzle, creeps into pilot hole; When drill bit reaches desired depth, cut conversion to brill, drill bit rotation carrying out grooving through the diameter of axle; The coal body crack is increased, and gas permeability increases.In lane, intersole position, the mash gas extraction pipeline is set; The boring of each mash gas extraction forms with the mash gas extraction pipeline and is communicated with; Constitute and to compile in the blank tape annular fissure circle the free gas of desorb, and get into the gas pumping system through the mash gas extraction pipe through the boring of tendency mash gas extraction.
The parameter in mash gas extraction hole is selected to arrange accompanying drawing 1,2 according to the radius of influence that is calculated.In the present embodiment, the zone of intermediate blank band is 60 m, and is every at a distance from boring of 6 m layout, guarantees to reach in the hole of minimum number optimal gas pumping effect.
The method of attachment of high-voltage pulse water jet slot system and device is as shown in Figure 3.The high-voltage pulse water jet bores and cuts integrated apparatus is the key that guarantees that the coal-bed gas extraction is carried out smoothly, and this equipment must have excellent sealing performance and abrasion resistance properties, to guarantee that in system equipment can bear the wearing and tearing of high pressure and coal petrography chip when operating.
Air water pulp separator major function is gush out speed and the pressure that changes gas through the buffering of gas pulp separator, cuts down gas and concentrates the peak value of gushing out, and improves the efficient of drilling.This device mainly utilizes gas lane former extraction system, and gas vent has been inserted mine extraction system, with the size of valve control negative pressure.Projecting coal bed executing gushed out gas under action of negative pressure in the brill process, can directly get into the extraction system through gas vent, and water, cinder directly get into screening automatically in the collecting vessel by the self gravitation effect, realizes that really gas, water, slag separate.Because the improvement of piece-rate system sealing performance is passed through the gas overwhelming majority of gushing out in the process of coal seam and is got into the extraction system, and a small amount of entering tunnel is only arranged, and can thoroughly solve the gas exceeding limit problem that spray orifice causes of boring of executing.
Specific embodiment described herein only is that the present invention's spirit is illustrated.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has used terms such as water tank 1, high-pressure pump 2, high-pressure water pipe 3, overflow valve 4, foot-operated reversal valve 5, globe valve 6, pressure meter 7, high pressure sealing rotation water delivery apparatus 8, rig 9, drilling rod 10, automatic switchover formula joint-cutting device 11, drill bit 12, gas pulp separator 13 morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present invention more easily; It all is contrary with spirit of the present invention being construed to any additional restriction to them.
Claims (3)
1. one kind to adopting long work plane blank tape gas pumping method greatly, it is characterized in that, may further comprise the steps:
Step 1, floor strata is provided with lane, position, an end below the inner working face of exploiting field, and lane, position, the end is positioned on the perpendicular bisector of machine lane and air way line;
Step 2; Bearing of trend is whenever laid drill site at a distance from 5 ~ 20m at its top along lane, position, the end; In drill site, lay fan drilling according to the scope of blank tape along the stope direction, i.e. the 1st drill site, the 2nd drill site N drill site, the drill site internal drilling requires: the boring of sector both sides must cover the four corner of nearest coal seam blank tape; Adjacent two borings are in that the spacing M in coal seam is smaller or equal to the radius of influence R of 2 times of rig cut surfaces farthest from lane, position, the end, and promptly M is smaller or equal to 2R;
Step 3 starts high-pressure pump, opens foot valve and air water pulp separator, and operating pressure is 0 ~ 3MPa, starts rig and holes, and is advanced into farthest till the 1 ~ 2m of top, coal seam;
Step 4, the rollback drilling rod, when creep into reach the precalculated position after, stop to advance, open foot valve and air water pulp separator, the rising pump pressure starts the diameter of axle and cuts automatic switch to brill, radially rotates slot; The grooving time is 0.5 ~ 20min, cuts a groove, stops the rig rotation, closes foot valve and air water pulp separator; Cut in rollback drilling rod to same coal seam the next position or next coal seam, finishes until whole coal seams cutting that drilling rod is passed through, and accomplishes the cutting work of creeping into of a boring;
Step 5, repeating step 3 to step 4 is concentrated sealing of hole after accomplishing all boring slots, after extraction finishes, finish.
2. according to claim 1 a kind of to adopting long work plane blank tape gas pumping method greatly, it is characterized in that, in the described step 2; Rig (9) boring after creeping into a drilling rod (10), is closed foot valve when seam face advances; Stopping rig creeping into, rotates; After adding drilling rod, continue to advance, until reaching predetermined boring point place.
3. according to claim 1 a kind of to adopting long work plane blank tape gas pumping method greatly; It is characterized in that; In the described step 5; When carrying out mash gas extraction, add a gas pulp separator (13) at the place, mash gas extraction aperture of drilling well groove and block the mash gas aperture, and carry out the gas slag simultaneously and separate.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102900460A (en) * | 2012-11-06 | 2013-01-30 | 中国矿业大学 | Method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on soft and high-outburst coal seam |
| CN103075148A (en) * | 2013-02-19 | 2013-05-01 | 中国矿业大学 | Method and device for fast measuring coal bed gas pressure through upward remote-distance hole drilling |
| CN103104222A (en) * | 2013-02-01 | 2013-05-15 | 中北大学 | Method for pumping and collecting coal bed gas through combination of ground vertical well and long bedding drill hole |
| CN106401557A (en) * | 2016-08-31 | 2017-02-15 | 安徽理工大学 | Method for determining drill hole effective extracting radius by testing coal seam gas content and gas pressure jointly |
| CN109763857A (en) * | 2019-04-01 | 2019-05-17 | 中煤科工集团西安研究院有限公司 | Administering method is taken out in the coal-bed gas extinction in lane to be dug of the intensive pectination hole drilling type of water jet in advance |
| CN111810223A (en) * | 2020-07-14 | 2020-10-23 | 河南平宝煤业有限公司 | One-side multi-lane gas control method for large-mining-height large-mining-length working face |
| CN114086958A (en) * | 2022-01-21 | 2022-02-25 | 太原理工大学 | Progressive bedding hydraulic cave-making construction method for stope face of monocline coal seam |
| CN114215584A (en) * | 2022-01-18 | 2022-03-22 | 山东科技大学 | Method for extracting gas from fan-shaped slot derived drill hole |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102900460A (en) * | 2012-11-06 | 2013-01-30 | 中国矿业大学 | Method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on soft and high-outburst coal seam |
| CN102900460B (en) * | 2012-11-06 | 2014-10-29 | 中国矿业大学 | Method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on soft and high-outburst coal seam |
| CN103104222A (en) * | 2013-02-01 | 2013-05-15 | 中北大学 | Method for pumping and collecting coal bed gas through combination of ground vertical well and long bedding drill hole |
| CN103104222B (en) * | 2013-02-01 | 2015-07-29 | 中北大学 | Ground peupendicular hole combines extraction coal bed gas method with concordant long drilled holes |
| CN103075148A (en) * | 2013-02-19 | 2013-05-01 | 中国矿业大学 | Method and device for fast measuring coal bed gas pressure through upward remote-distance hole drilling |
| CN106401557B (en) * | 2016-08-31 | 2019-05-07 | 安徽理工大学 | A kind of method of joint test coal seam gas-bearing capacity and the determining effective extraction radius that drills of gas pressure |
| CN106401557A (en) * | 2016-08-31 | 2017-02-15 | 安徽理工大学 | Method for determining drill hole effective extracting radius by testing coal seam gas content and gas pressure jointly |
| CN109763857A (en) * | 2019-04-01 | 2019-05-17 | 中煤科工集团西安研究院有限公司 | Administering method is taken out in the coal-bed gas extinction in lane to be dug of the intensive pectination hole drilling type of water jet in advance |
| CN111810223A (en) * | 2020-07-14 | 2020-10-23 | 河南平宝煤业有限公司 | One-side multi-lane gas control method for large-mining-height large-mining-length working face |
| CN114215584A (en) * | 2022-01-18 | 2022-03-22 | 山东科技大学 | Method for extracting gas from fan-shaped slot derived drill hole |
| CN114215584B (en) * | 2022-01-18 | 2023-06-06 | 山东科技大学 | Method for extracting gas from sector slot derivative drilling holes |
| CN114086958A (en) * | 2022-01-21 | 2022-02-25 | 太原理工大学 | Progressive bedding hydraulic cave-making construction method for stope face of monocline coal seam |
| CN114086958B (en) * | 2022-01-21 | 2022-04-08 | 太原理工大学 | Progressive bedding hydraulic cave-making construction method for stope face of monocline coal seam |
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Application publication date: 20121024 |