CN103899268A - Method for improving gas extraction hole sealing tightness - Google Patents
Method for improving gas extraction hole sealing tightness Download PDFInfo
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- CN103899268A CN103899268A CN201410138025.8A CN201410138025A CN103899268A CN 103899268 A CN103899268 A CN 103899268A CN 201410138025 A CN201410138025 A CN 201410138025A CN 103899268 A CN103899268 A CN 103899268A
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- hole
- sealing
- hole sealing
- bag
- gas pumping
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- 238000007789 sealing Methods 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000000605 extraction Methods 0.000 title abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 45
- 239000003245 coal Substances 0.000 claims abstract description 23
- 238000005507 spraying Methods 0.000 claims abstract description 9
- 239000011435 rock Substances 0.000 claims abstract description 7
- 239000003566 sealing material Substances 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims description 27
- 238000005553 drilling Methods 0.000 claims description 18
- 230000002787 reinforcement Effects 0.000 claims description 11
- 238000005187 foaming Methods 0.000 claims description 7
- 238000000889 atomisation Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000007569 slipcasting Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 5
- 239000012779 reinforcing material Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 58
- 238000005516 engineering process Methods 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000005065 mining Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical group O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 239000011496 polyurethane foam Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Abstract
The invention discloses a method for improving the gas extraction hole sealing tightness, which comprises the following steps: the first step is as follows: sealing the hole sealing section of the drill hole and a crack generated by vibration of the drill hole by using a hole sealing material; the second step is that: reinforcing and crack plugging operation is carried out on the coal and rock mass loosening zone near the hole sealing section of the drilled hole by using a reinforcing material; the third step: and (3) performing surface spraying on the coal wall near the orifice of the hole sealing section of the drill hole by using a spraying material. The method combines the hole sealing, reinforcing and spraying processes, effectively blocks the cracks causing air leakage, can obviously improve the gas extraction hole sealing tightness, fundamentally solves the problem of fast attenuation of gas extraction concentration, enables the gas extraction concentration to be far higher than the gas extraction process adopted by the existing coal mine, improves the utilization rate of gas energy and the safety of the coal mine, and has wide application prospect.
Description
Technical field
The invention belongs to mash gas pumping drilling hole sealing technology field, be specifically related to a kind of method that improves gas pumping sealing of hole seal.
Background technology
Gas is the accompanying gas in coal generative process, and its main component is methane.For a long time, gas is being played the part of three kinds of different role.First, gas is the first killer of coal mining, and in the great serious accident of China's coal-mine, the accident that gas explosion causes accounts for 70% to 80%; Secondly, gas is a kind of greenhouse gases of danger, its greenhouse gases effect is carbon dioxide 21 times; Finally, gas is again a kind of important clean energy resource, and China's buried depth is shallower than the coal bed gas resource total amount of 2000 meters up to 36.8 tcms, suitable with domestic conventional gas reserves.
According to statistics, the average extraction rate of mine gas of the main producing coal country such as the U.S., Australia all exceedes 50%, and China is only 23%[1].The reason that causes this phenomenon is many-sided, and wherein, China's underground gas extraction inefficiency is one of most important reason at present.The low one side of gas pumping efficiency will directly cause extraction with high costs, make gas compared with conventional gas in cost inferior position, the overall profit margin of industry is on the low side, this has affected market investment and the exploitation enthusiasm of the sector to a great extent, and has affected coal bed gas application and the popularization of source of the gas as a supplement; On the other hand, the low coal mining enterprise that also makes of gas pumping efficiency completes the spent extraction overlong time of extraction scheduled volume, and then makes coal mining time lag, brings huge economic loss to coal mining enterprise.
In many reasons that affects gas pumping efficiency, domestic colliery hole sealing technology generally falls behind one of reason being undoubtedly most critical.The drilling and sealing method for gas that China's coal-mine generally adopts at present mainly contains two kinds: cement mortar sealing of hole and polyurethane foam material sealing of hole.Cement mortar hole-sealing technology adopts segmented seal, because cement very easily forms gas passage, causes gas leakage serious, and labour intensity is large, and extraction efficiency is low, and the pre-extraction time is long, thereby has reduced coal mining efficiency.Polyurethane foam material sealing of hole is to utilize self blow pressure of polyurethane material to make material infiltrate boring crag (or rib) crack, thereby can greatly improve sealing quality.Because polyurethane material has the advantages such as consumption is little, labour intensity is low, sealing of hole effect is better, make it aspect gas drilling sealing of hole, obtain popularization and answer.
The patent No. is that 201010220304.0 patent of invention discloses a kind of method that uses polyurethane foamed bags blocked gas drainage hole, rubbing hole sealing bag mixes two kinds of components mutually, with together sending in extraction boring by hole sealing bag and releasing pipe, expanded material starts foaming afterwards, and finally burst hole sealing bag, realize sealing of hole operation.The patent No. is that 201210304338 patent of invention discloses a kind of method for sealing, can effectively solve that extraction borehole sealing of hole in the past leaks air after completing and the difficult problem that cannot repeat sealing of hole, can guarantee that extraction borehole is air tight, but great in constructing amount, can not solve from essence the problem of gas leakage.
Once poorly sealed between gas drilling hole wall and releasing pipe, can cause aperture to leak out, the interior extraction negative pressure deficiency that makes to hole, and then directly cause coal bed gas extraction inefficiency.Affect extraction efficiency except direct, sealing of hole sternly also can not reduce the methane concentration in extraction gas, greatly increase post processing cost, and then further raise extraction and the development cost of gas, and increase the potential safety hazard (methane concentration 5%-16% is blast area) of gas conveying and last handling process.
Therefore, urgently develop new hole-sealing technology, effectively make up the deficiency of traditional hole-sealing technology, mine gas drilling is carried out to high-quality shutoff, improve extraction concentration, reduce the gas density rate of decay, the utilization rate of the gas energy is improved, Gas Disaster is carried out to active and effective improvement simultaneously, and then reduce coal mine gas disaster.
Summary of the invention
In view of this, the object of this invention is to provide a kind of method that improves gas pumping sealing of hole seal, overcome that prior art gas extraction concentration is low causes the problem that extraction efficiency is not high, and significantly reduced the gas density rate of decay.
The object of the invention is to be achieved through the following technical solutions:
A method that improves gas pumping sealing of hole seal, comprises the steps:
The first step: the crack that uses sealing material to produce to drilling and sealing section and by boring vibrations is carried out airtight;
Second step: use reinforcement material near coal and rock loosening belt drilling and sealing section to be reinforced and crack shutoff operation;
The 3rd step: use sprayed on material to carry out surface spraying near rib drilling and sealing sector hole mouth.
Further, the detailed process of the described first step is as follows: 1) hole sealing bag interval is bundled on gas pumping pipe, Grouting Pipe is passed to hole sealing bag simultaneously, the discharging opening of Grouting Pipe is between adjacent hole sealing bag; The bag middle part of hole sealing bag is provided with separating device to be opened/closed, and described separating device is divided into bag two parts of mutual isolation, and corresponding two kinds of components that fill expanded material I respectively in two parts bag; 2) separating device of hole sealing bag is opened, two kinds of components of expanded material I in hole sealing bag are flowed to together, with together sending in mash gas pumping drilling by hole sealing bag and gas pumping pipe; 3) after the expanded material I foaming of hole sealing bag solidifies, between hole sealing bag, form seal section, by intrusion pipe, two component mixed liquors of the expanded material II mixing are injected in seal section, after expanded material II foaming solidifies, complete sealing of hole operation.
Further, the detailed process of described second step is as follows: near gas pumping hole, bore shallow bore hole, after shallow bore hole is drilled to, adopt grouting pump that reinforcement material is injected to shallow bore hole, reinforcement material infiltrates through and in fractured coal and rock crack, react and solidify, and operates thereby complete to reinforce.
Further, the detailed process of described the 3rd step is as follows: by special slip casting pump, sprayed on material is inputted in high-pressure spray gun, after high-pressure atomization, is sprayed on boring surface region, form one deck can completely cut off air enter hole around dense film in tiny crack.
The invention has the beneficial effects as follows: the method that the present invention utilizes sealing of hole, reinforcing, three kinds of techniques of spraying to combine, carry out effective shutoff to causing the crack of leaking out, can significantly improve gas pumping sealing of hole seal, fundamentally solve the gas extraction concentration fast problem that decays, the extraction technique that gas extraction concentration is adopted higher than current colliery far away, the utilization rate and the safety of coal mines that have improved the gas energy, have broad application prospects.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on will be apparent to those skilled in the art to investigating below, or can be instructed from the practice of the present invention.Target of the present invention and other advantages can be realized and be obtained by manual below.
Brief description of the drawings
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is the schematic diagram of the inventive method first stage-hole-sealing technology;
Fig. 2 is the schematic diagram of the inventive method second stage-reinforcement process;
Fig. 3 is the schematic diagram of the inventive method phase III-spraying coating process.
Detailed description of the invention
Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.Should be appreciated that preferred embodiment is only for the present invention is described, instead of in order to limit the scope of the invention.
A kind of method that improves gas pumping sealing of hole seal of the present embodiment, comprises the steps:
The first step: the crack that uses sealing material to produce to drilling and sealing section and by boring vibrations is carried out airtight;
Second step: use reinforcement material near coal and rock loosening belt drilling and sealing section to be reinforced and crack shutoff operation;
The 3rd step: use sprayed on material to carry out surface spraying near rib drilling and sealing sector hole mouth.
The method that the present embodiment utilizes sealing of hole, reinforcing, three kinds of techniques of spraying to combine, carry out effective shutoff to causing the crack of leaking out, can significantly improve gas pumping sealing of hole seal, fundamentally solve the gas extraction concentration fast problem that decays, the extraction technique that gas extraction concentration is adopted higher than current colliery far away, the utilization rate and the safety of coal mines that have improved the gas energy, have broad application prospects.
In the present embodiment, the detailed process of the described first step comprises: first, hole sealing bag 1 interval is bundled on gas pumping pipe 2, Grouting Pipe 3 is passed to hole sealing bag simultaneously, the discharging opening of Grouting Pipe is between adjacent hole sealing bag; The bag middle part of hole sealing bag is provided with separating device to be opened/closed, and described separating device is divided into bag two parts of mutual isolation, and corresponding two kinds of components that fill expanded material I respectively in two parts bag; Then, the separating device of hole sealing bag is opened, two kinds of components of expanded material I in hole sealing bag are flowed to together, with together sending in mash gas pumping drilling 4 by hole sealing bag 1 and gas pumping pipe 2; Finally, after the expanded material I foaming of hole sealing bag solidifies, between hole sealing bag, form seal section, by intrusion pipe, two component mixed liquors of the expanded material II mixing are injected in seal section, after expanded material II foaming solidifies, complete sealing of hole operation, mash gas pumping drilling 4 and near-end crack 5 are sealed.
In the present embodiment, the detailed process of described second step is as follows: reinforcement material A material 6 and reinforcement material B material 7 are inputted to high-pressure rubber pipe 9 by grouting pump 8 volume ratio according to the rules, enter again in special filling gun 10, under certain pressure, by being furnished with in Grouting Pipe 12 injection holes of special hole packer 11, reinforcement material energy rapid permeability enters in far-end crack 13, react and solidify, generate the macromolecule reinforcement material of high strength, high tenacity, fractured coal and rock is bonded together, thereby realize the effect in reinforcing and shutoff crack, complete and reinforce operation.
In the present embodiment, the detailed process of described the 3rd step is as follows: complete sealing of hole and reinforce after operation, by sprayed on material A material 14 and sprayed on material B material 15, by volume ratio according to the rules of special slip casting pump input high-pressure rubber pipe, then enter in spray gun special 16 and mix, under certain pressure-acting after atomization, be sprayed on boring surface region, material can, at several seconds inner gel, form the film 17 of one deck densification, has effectively completely cut off air.
Finally explanation is, 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 aim and the scope of the technical program, it all should be encompassed in the middle of claim scope of the present invention.
Claims (4)
1. a method that improves gas pumping sealing of hole seal, is characterized in that: comprise the steps:
The first step: the crack that uses sealing material to produce to drilling and sealing section and by boring vibrations is carried out airtight;
Second step: use reinforcement material near coal and rock loosening belt drilling and sealing section to be reinforced and crack shutoff operation;
The 3rd step: use sprayed on material to carry out surface spraying near rib drilling and sealing sector hole mouth.
2. a kind of method that improves gas pumping sealing of hole seal according to claim 1, it is characterized in that: the detailed process of the described first step is as follows: 1) hole sealing bag interval is bundled on gas pumping pipe, Grouting Pipe is passed to hole sealing bag, the discharging opening of Grouting Pipe is between adjacent hole sealing bag simultaneously; The bag middle part of hole sealing bag is provided with separating device to be opened/closed, and described separating device is divided into bag two parts of mutual isolation, and corresponding two kinds of components that fill expanded material I respectively in two parts bag; 2) separating device of hole sealing bag is opened, two kinds of components of expanded material I in hole sealing bag are flowed to together, with together sending in mash gas pumping drilling by hole sealing bag and gas pumping pipe; 3) after the expanded material I foaming of hole sealing bag solidifies, between hole sealing bag, form seal section, by intrusion pipe, two component mixed liquors of the expanded material II mixing are injected in seal section, after expanded material II foaming solidifies, complete sealing of hole operation.
3. a kind of method that improves gas pumping sealing of hole seal according to claim 1, it is characterized in that: the detailed process of described second step is as follows: near gas pumping hole, bore shallow bore hole, after shallow bore hole is drilled to, adopt grouting pump that reinforcement material is injected to shallow bore hole, reinforcement material infiltrates through and in fractured coal and rock crack, reacts and solidify, and reinforces operation thereby complete.
4. a kind of method that improves gas pumping sealing of hole seal according to claim 1, it is characterized in that: the detailed process of described the 3rd step is as follows: by special slip casting pump, sprayed on material is inputted in high-pressure spray gun, after high-pressure atomization, be sprayed on boring surface region, form one deck can completely cut off air enter hole around dense film in tiny crack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410138025.8A CN103899268A (en) | 2014-04-08 | 2014-04-08 | Method for improving gas extraction hole sealing tightness |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410138025.8A CN103899268A (en) | 2014-04-08 | 2014-04-08 | Method for improving gas extraction hole sealing tightness |
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| CN103899268A true CN103899268A (en) | 2014-07-02 |
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| CN201410138025.8A Pending CN103899268A (en) | 2014-04-08 | 2014-04-08 | Method for improving gas extraction hole sealing tightness |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108104865A (en) * | 2017-11-28 | 2018-06-01 | 中国矿业大学 | A kind of concordant drilling Anti-air-leakage gas pumping method |
| CN109681244A (en) * | 2019-03-07 | 2019-04-26 | 马钢集团矿业有限公司 | A kind of grouting method of fine crack rock |
| CN110725700A (en) * | 2019-09-27 | 2020-01-24 | 中国矿业大学 | Coal seam spraying reinforcement and graded grouting cooperative hole sealing method |
| CN111472833A (en) * | 2020-06-08 | 2020-07-31 | 徐州工程学院 | Method for sealing holes of cleaning-free drilling sealing section coal powder |
| CN111119978B (en) * | 2019-12-04 | 2021-12-14 | 湖南科技大学 | Method for extracting coal seam gas by drilling holes in bedding and hydraulically cutting seams |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1939989B2 (en) * | 1969-08-06 | 1976-03-18 | Zeissig, Ortwin M., 4330 Mülheim | Methane drainage borehole casing - with seal packing extensible after extraction of compressive shell |
| RU2221146C1 (en) * | 2002-07-17 | 2004-01-10 | Институт горного дела СО РАН (статус государственного учреждения) | Device sealing well-head |
| CN101634231A (en) * | 2009-05-31 | 2010-01-27 | 山西晋城无烟煤矿业集团有限责任公司 | Method for reinforcing and sealing coal mine and preventing gas |
| CN102704984A (en) * | 2012-04-28 | 2012-10-03 | 中国矿业大学 | Borehole high-concentration gas extraction and drainage method and device thereof |
| CN102900396A (en) * | 2012-11-01 | 2013-01-30 | 中国矿业大学 | Method for integrally sealing and separating gas extraction drilled hole in coal seam |
| CN102937011A (en) * | 2012-12-03 | 2013-02-20 | 中国矿业大学 | Secondary grouting and plugging device and method of regional crack field of gas extraction and drilling group |
-
2014
- 2014-04-08 CN CN201410138025.8A patent/CN103899268A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1939989B2 (en) * | 1969-08-06 | 1976-03-18 | Zeissig, Ortwin M., 4330 Mülheim | Methane drainage borehole casing - with seal packing extensible after extraction of compressive shell |
| RU2221146C1 (en) * | 2002-07-17 | 2004-01-10 | Институт горного дела СО РАН (статус государственного учреждения) | Device sealing well-head |
| CN101634231A (en) * | 2009-05-31 | 2010-01-27 | 山西晋城无烟煤矿业集团有限责任公司 | Method for reinforcing and sealing coal mine and preventing gas |
| CN102704984A (en) * | 2012-04-28 | 2012-10-03 | 中国矿业大学 | Borehole high-concentration gas extraction and drainage method and device thereof |
| CN102900396A (en) * | 2012-11-01 | 2013-01-30 | 中国矿业大学 | Method for integrally sealing and separating gas extraction drilled hole in coal seam |
| CN102937011A (en) * | 2012-12-03 | 2013-02-20 | 中国矿业大学 | Secondary grouting and plugging device and method of regional crack field of gas extraction and drilling group |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108104865A (en) * | 2017-11-28 | 2018-06-01 | 中国矿业大学 | A kind of concordant drilling Anti-air-leakage gas pumping method |
| CN108104865B (en) * | 2017-11-28 | 2019-06-11 | 中国矿业大学 | A kind of concordant drilling Anti-air-leakage gas pumping method |
| CN109681244A (en) * | 2019-03-07 | 2019-04-26 | 马钢集团矿业有限公司 | A kind of grouting method of fine crack rock |
| CN109681244B (en) * | 2019-03-07 | 2021-03-19 | 安徽马钢矿业资源集团有限公司 | Grouting method for micro-fractured rock mass |
| CN110725700A (en) * | 2019-09-27 | 2020-01-24 | 中国矿业大学 | Coal seam spraying reinforcement and graded grouting cooperative hole sealing method |
| CN111119978B (en) * | 2019-12-04 | 2021-12-14 | 湖南科技大学 | Method for extracting coal seam gas by drilling holes in bedding and hydraulically cutting seams |
| CN111472833A (en) * | 2020-06-08 | 2020-07-31 | 徐州工程学院 | Method for sealing holes of cleaning-free drilling sealing section coal powder |
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Application publication date: 20140702 |