CN101240715A - One well three-purpose mash gas harnessing method for ground well drilling and ground well drilling - Google Patents
One well three-purpose mash gas harnessing method for ground well drilling and ground well drilling Download PDFInfo
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- CN101240715A CN101240715A CNA200810019549XA CN200810019549A CN101240715A CN 101240715 A CN101240715 A CN 101240715A CN A200810019549X A CNA200810019549X A CN A200810019549XA CN 200810019549 A CN200810019549 A CN 200810019549A CN 101240715 A CN101240715 A CN 101240715A
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Abstract
Mash gas treating method of floor well drilling having three functions and floor well drilling are disclosed, the character of it is that gas is token out by using the same floor well drilling in ground with the following steps; First, before exploiting , mounting fracturing well formal floor well drilling, forming artificial slit and gas producing channel with fracturing method in coal seam, collecting gas using positive-pressure released by gas burning-self, eliminating projection of lower coal and gas; Second exploiting lower coal group, pressure relief and stress releasing of upper coal group and middle coal group when lower coal group is exploited, and gas of upper coal group and middle coal group in bending subsiding belt is exploited by negative-pressure type in the same floor well drilling; Finally, when exploiting upper coal group and middle coal group, once more the same floor well drilling negative-pressure exploits the exploited region gas in middle coal group or upper coal group working surface. Gas exploiting ratio of the method is high, ratio between cost and efficiency is good, and exploited gas concentration is high.
Description
Technical field
The present invention relates to the improvement method and the drilling well of coal mine gas, a kind of ground drilling that utilizes of more specifically saying so carries out method and wellbore structure that mine gas is administered, realized the coal mining safety in production.
Background technology
Anhui Province's Huaibei Mining Area is positioned at Chinese East China, is the important coal production base of China, and coal measure strata is coal, the Permian Period, generally contains 8～36 layers in coal seam.Minable coal seam mainly contains three coal groups, and last coal group refers to 3,4 coal seams, and middle coal group refers to 7,8,9 coal seams, and following coal group refers to 10 coal seams, gross thickness 7～23m, minable thickness 2.95～20.97m.Great majority are the outstanding very serious mines of high gas, coal and gas in the mining area, and coal seam gas-bearing capacity reaches 10～25m
3/ t, gas pressure reaches 3.5～6.0Mpa.8 coal seams as coal group in the luling coal mine are super high seam, and the structure coal is grown, ature of coal is soft, gas permeability is low, contain that gas amount is big, pressure is high, belong to the hard-pumped coal seam, and the outstanding threat of coal and gas once took place.
In traditional gas pumping method such as down-hole layer-through drilling, gas pumping rate less than 30%, particularly the mine stope extends to the deep, gas pressure increases, content increases, following coal group (10 coal seam), middle coal group (8,9 coal seam) all become the safety in production that projecting coal bed, traditional gas pumping method is not enough to ensure the coal seam, deep.
The general about 2 yuan/m of underground gas extraction direct cost
3, owing to the restriction in space, down-hole, the down-hole is generally only laid one road gas and is carried main pipe again, and the gas of the various extraction modes in down-hole enters same main pipe, reaches relatively difficulty of high concentration gas, influences the utilization of gas; Directly in the face of projecting coal bed, the measure of anti-at present boring spray orifice is imperfection also, can not avoid the generation of spray orifice phenomenon fully, threatens worker's life safety in the down-hole drilling drilling process;
Summary of the invention
The present invention is for avoiding above-mentioned existing in prior technology problem, a kind of gas pumping rate height is provided, cost effectiveness is good, the gas density height of extraction, be used easily, and can avoid the mash gas harnessing method and the ground drilling of ground drilling one well three usefulness of the unsafe factors such as gas spray orifice that may exist in the underground gas extraction method.
Technical solution problem of the present invention adopts following technical scheme:
The characteristics of the mash gas harnessing method of ground drilling one well three usefulness of the present invention are to utilize same ground drilling by carrying out gas pumping with the next stage on ground;
Phase I: be ahead of coal mining, the ground drilling of fractured well form is set, form man-made fracture and aerogenesis passage with Splitting Method in the coal seam, the malleation of utilizing gas to discharge is naturally carried out gas and is collected the coal and the gas high-lighting of coal group under eliminating;
Second stage: exploitation is the coal group down, during following coal group exploitation last coal group and middle group of coal is caused and adopts release and stress release, utilizes same ground drilling, be in the bending subsidence band with the mode extraction of negative pressure on gas in coal group and the middle coal group;
Phase III: in the exploitation coal group and middle coal group the time, the goaf gas when utilizing coal group in the extraction of described same ground drilling negative pressure once more or going up this layer of coal group working face mining.
The characteristics of the inventive method also are:
In the described phase I, the pressure sand intensity in the Splitting Method is not less than 6-8m
3/ m carries out the gas malleation by drainage and step-down and collects; For following coal group, inject CO by drilling well
2Or N
2Gas displaces the gas in the primary coal seam, and malleation is collected.
Carry out the layout of ground drilling on ground with the rectangular pattern of 300 * 300m square well pattern or 200 * 300m, the ground drilling position is positioned at down that coal group work plane moves towards per 200～300m flatly, and be positioned at the middle part of coal group work plane tendency down, apart from coal group work plane air way 50～70m down.
The design feature that is applied in the ground drilling in the mash gas harnessing method that described ground drilling one well uses more is:
Be made up of table soil suite pipe and production casing, production casing is in the section of coal seam, on the tube wall of production casing, is provided with the perforation that connects to the coal seam.
The aperture of table soil suite pipe is D244.5mm, wall thickness 11.05mm; The aperture of production casing is D139.7mm, wall thickness 9.17mm; The density 16 holes/m of perforation, the aperture is 10mm, perforation forms netted gas pumping eyelet on the tube wall of production casing.
The present invention adopts the method for ground drilling pressure break to transform the crack and the passage in coal seam in the phase I, and pressure break is taken out about 10 years in advance.Utilize same drilling well extraction protected seam promptly to go up the minery gas pressure relief of coal group and following coal group in the second stage.Facts have proved; the exploitation topping is in the corresponding region in outburst danger coal seam earlier; projecting coal bedly move and be out of shape to mined bed goaf direction; at first produce the dilatancy of perpendicular slice; the coal seam is enlarged with vertical crack with original aspect in the rock stratum; and produce the new crack vary in size; impel gas permeability of coal seam to increase substantially; thereby geostatic stress and gas pressure are reduced, and coal seam intensity increases relatively, and the destructive power that causes gas to be caused in the coal seam reduces; if can be in time with adopting; with the gas pressure relief of taking out the coal seam, it is outstanding not only to eliminate protected seam gas, and gas is gushed out and will be reduced significantly in mining work.Experimental data during according to Lu Ling ore deposit II1048 work plane 10 seam minings, on cover after 8, the 9 coal seam releases 1930 times of the original raisings of coal seam permeability ratio, individual well release gas production can be up to 3,500,000 m
3More than.Phase III, same drilling well promptly became work plane goaf gas extraction well for this layer exploitation of last coal group and middle coal group.Along with working face mining, " perpendicular three bands " and " Heng San district " that roof collapses and falls to causing, be that the goaf is along the top board vertical direction, be divided into caving zone, fissure zone, bending subsidence band from lower to upper, support influence area, absciss layer district, compacting zone again and can be divided into rib along advance of the face direction.Along with the propelling of work plane, " three bands " and " three districts " of across pitch of top board and base plate also move forward.Work plane middle part compacting gradually, but coal column side around the work plane, because the supporting role of coal column, make established mining induced fissure be difficult for the compacting closure, and upper and lower, left and right connect mutually, have formed the endless loop that is communicated with, and claim the round section joint ring passage again, provide space and passage for goaf gas flows, also provide source of the gas for goaf well extraction.
Ground drilling safety of the present invention is good, and the gas density height is beneficial to and adopts the variety of way utilization, and the mode of its " well three usefulness " can significantly improve the gas pumping rate, guarantees the safety in production in colliery.Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention is by the gas pumping of drilling well pressure break, coal group gas is more than 40% under can extraction, make coal and gas projecting coal bed become non-projecting coal bed, thereby can carry out safe developing, driving and working face extraction to following coal group, the most thorny protrusion-dispelling technical barrier when having solved the projecting coal bed exploitation in projecting coal bed particularly deep.
2, the present invention is by " well three usefulness " of drilling well, the both primary gas in extraction coal seam, pumping and mining pressure relief mash gas again, extraction goaf gas also, changed traditional method by down-hole improvement, started a new approach of administering coal mine gas fully by ground drilling, accomplished once to dig a well, repeatedly used for a long time.
3, the inventive method is administered gas by the ground drilling extraction, can reduce a large amount of firedamp taking-out discharging drilling engineerings in down-hole and gas drainage under suction tunnel, corresponding saving mine gas control expense, and ground drilling is administered gas, can eliminate the down-hole and administer the security threat that gas may bring, ensure worker's life security.
4, the gas that ground drilling is extracted out in the inventive method is high concentration gas, helps carrying and utilizing with pipeline, reduces to airborne release, and the protection environment of mining area also can improve the mine economic benefit.
5, according to result of the test, by ground drilling " well three usefulness " extraction, the extraction rate is estimated can reach more than 50%, has realized the safe back production of the soft high seam of the high gas of low-permeable on the one hand, and is that main mining coal seam uses comprehensive High-efficient Production of adopting to create condition.
Description of drawings
Fig. 1 is the inventive method schematic diagram.
Fig. 2 flows to schematic diagram for the inventive method phase I coal-bed gas.
Fig. 3 flows to schematic diagram for the inventive method second stage coal-bed gas.
Fig. 4 flows to schematic diagram for the inventive method phase III coal-bed gas.
Fig. 5 is a wellbore structure schematic diagram of the present invention.
Number in the figure: coal group, 5 table soil suite pipes, 6 production casings, 7 perforations, 8 gas utilization equipment on the coal group, 4 in 1 ground drilling, the 2 times coal groups, 3.
Below by the specific embodiment, the invention will be further described in conjunction with the accompanying drawings:
The specific embodiment
Referring to Fig. 1, to form well pattern at a plurality of ground drillings 1 of ground configuration and adopt by pressure break row, large tracts of land reduces water level, forms the coal seam release, discharges gas, and main target is to make 10 coal seams promptly descend the gas recovery ratio of coal group 2 to reach 40%, realizes extinction substantially; Then when 10 working face of coal seam are exploited, on cover 7,8,9 coal seams promptly in coal group 3 and rock stratum cause and unload compression swelling, significantly improve gas permeability of coal seam, use ground drilling 1 negative pressure pumping and mining pressure relief mash gas; In the middle of during coal group 3 working face minings, use ground drilling 1 extraction work plane goaf gas again, final " well three usefulness " the extraction coal-bed gas repeatedly of realizing reaches the purpose of effecting a radical cure gas, and the gas of extraction can directly be sent in the gas utilization equipment 8 and enter gas utilization.
In concrete the enforcement, utilize same ground drilling 1 on ground by carrying out gas pumping with the next stage;
Phase I: coal mining is 8～10 years in advance, and the ground drilling 1 of fractured well form is set, and forms man-made fracture and aerogenesis passage with Splitting Method in the coal seam, and the malleation of utilizing gas to discharge is naturally carried out gas and collected the coal and the gas high-lighting of coal group 2 under eliminating; In this stage, Splitting Method presses sand intensity to be not less than 6-8m
3/ m carries out the gas malleation by drainage and step-down and collects; For following coal group 2, can inject CO by drilling well
2Or N
2Gas displaces the gas in the primary coal seam, and the malleation collection, and is shown in Figure 2.
Second stage: exploitation is coal group 2 down, the exploitation of following coal group 2 causes last coal group 4 and middle group of coal 3 and adopts release and stress release, utilize same ground drilling 1, be in the gas of going up in the bending subsidence band in coal group 4 and the middle coal group 3 with the mode extraction of negative pressure, shown in Figure 3.
Phase III: in the exploitation coal group 4 and middle coal group 3 time, the goaf gas when utilizing coal group 3 and 4 layer working face minings of last coal group in the same ground drilling 1 negative pressure extraction once more, shown in Figure 4.
In concrete the enforcement, rectangular pattern with 300 * 300m square well pattern or 200 * 300m is advanced the layout of drilling well on ground, coal group work plane moved towards per 200～300 meters a bites under the drilling well position was positioned at by the position, hole, and was positioned at work plane middle part, distance group coal work plane air way 50～70m down.
Referring to Fig. 5, in the present embodiment, ground drilling is made up of table soil suite pipe 1 and production casing 2, in coal seam section 4, utilizes perforation 3 to be communicated with the coal seam; Wherein, the aperture of table soil suite pipe 1 is D244.5mm, wall thickness 11.05mm; The aperture of production casing 2 is D139.7mm, wall thickness 9.17mm; The shot density 16 holes/m of coal seam section 4, the aperture is 10mm, forms netted gas pumping eyelet by perforation 3 on the drilling shaft lining of coal seam section 4.
In concrete the enforcement, related measure comprises:
1, the 3-d seismic exploration technology is adopted in the exploiting field, verify coal seam, exploiting field situation, stability and structure development situation etc.
2, ground drilling " well three usefulness " must be the gang of wells pressure break, and concentrated row adopts, and can select a bite well earlier in the engineering construction, do individual well row and adopt test,, carry out the reservoir numerical simulation by computer according to the history matching analysis that row adopts data, optimize gang of wells and arrange, rationally fracturing technology.
3, individual well must carry out layering row and adopts test, in the hope of the gas production of upper and lower coal group reality, for effect assessment in the future provides foundation.
4, be generally the structure coal owing to organize 7,8,9 coal seams of coal in the Huaibei Mining Area, poor permeability, it is unfavorable that pressure break row is adopted, and part 8 coal top boards also can be selected in the fractured layer position, promptly utilize " virtual payzone " notion, make the coal seam release by the top board pressure break, discharge gas.
Claims (5)
1, the mash gas harnessing method of ground drilling one well three usefulness is characterized in that utilizing same ground drilling (1) by carrying out gas pumping with the next stage on ground;
Phase I: be ahead of coal mining, the ground drilling (1) of fractured well form is set, form man-made fracture and aerogenesis passage with Splitting Method in the coal seam, the malleation of utilizing gas to discharge is naturally carried out gas and is collected the coal and the gas high-lighting of coal group (2) under eliminating;
Second stage: exploitation is coal group (2) down, in following coal group (2) when exploitation, cause last coal group (4) and middle group of coal (3) and adopt release and stress release, utilize same ground drilling (1), be in the gas of going up in the bending subsidence band in coal group (4) and the middle coal group (3) with the mode extraction of negative pressure;
Phase III: in the exploitation coal group (4) and middle coal group (3) time, the goaf gas when utilizing coal group (3) in described same ground drilling (1) the negative pressure extraction once more or going up coal group (4) this layer working face mining.
2, the mash gas harnessing method of ground drilling one well three usefulness according to claim 1 is characterized in that in the described phase I, and the pressure sand intensity in the Splitting Method is not less than 6-8m
3/ m carries out the gas malleation by drainage and step-down and collects; For following coal group (2), inject CO by drilling well
2Or N
2Gas displaces the gas in the primary coal seam, and malleation is collected.
3, the mash gas harnessing method of ground drilling one well three usefulness according to claim 1, it is characterized in that carrying out on ground the layout of ground drilling (1) with the rectangular pattern of 300 * 300m square well pattern or 200 * 300m, ground drilling (1) position is positioned at down that coal group work plane moves towards per 200～300m flatly, and be positioned at the middle part of coal group work plane tendency down, apart from coal group work plane air way 50～70m down.
4, a kind of ground drilling that is applied in the described mash gas harnessing method of claim 1, it is characterized in that forming by table soil suite pipe (5) and production casing (6), described production casing (6) is in the section of coal seam, on the tube wall of production casing (6), is provided with the perforation (7) that connects to the coal seam.
5, ground drilling according to claim 4, the aperture that it is characterized in that described table soil suite pipe (5) is D244.5mm, wall thickness 11.05mm; The aperture of described production casing (6) is D139.7mm, wall thickness 9.17mm; The density 16 holes/m of described perforation (7), the aperture is 10mm, described perforation (7) forms netted gas pumping eyelet on the tube wall of production casing (6).
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| CN101915083A (en) * | 2010-08-13 | 2010-12-15 | 山西晋城无烟煤矿业集团有限责任公司 | Method for extracting coalbed gases from coal mines by upper and lower combination |
| CN101915085A (en) * | 2010-08-13 | 2010-12-15 | 山西晋城无烟煤矿业集团有限责任公司 | Low-air-permeability coal-bed gas extraction method |
| CN101915084A (en) * | 2010-08-13 | 2010-12-15 | 山西晋城无烟煤矿业集团有限责任公司 | Process for pumping and exploiting coal bed gas by together using ground well drilling and underground hole drilling |
| CN101915086A (en) * | 2010-08-13 | 2010-12-15 | 山西晋城无烟煤矿业集团有限责任公司 | Coal mine underground gas borehole fracturing method |
| CN102352769A (en) * | 2011-10-21 | 2012-02-15 | 河南煤业化工集团研究院有限责任公司 | Integrated mining method for commonly mining coal and gas of high mine |
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| CN102536240A (en) * | 2012-01-17 | 2012-07-04 | 河南省煤层气开发利用有限公司 | Method for preventing rock burst by adopting high-pressure fracturing |
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| CN103953386A (en) * | 2014-03-12 | 2014-07-30 | 淮北矿业（集团）勘探工程有限责任公司 | Upstream-blocking and downstream-seepage method for extracting gas in mining area |
| CN105134286A (en) * | 2015-10-13 | 2015-12-09 | 山西晋煤集团技术研究院有限责任公司 | Method for extracting gas of gob of L-shaped well |
| CN106150541A (en) * | 2016-07-05 | 2016-11-23 | 安徽理工大学 | A kind of base plate directional drilling group and neighbouring lower protected seam gas pumping method |
| CN106761585A (en) * | 2017-02-25 | 2017-05-31 | 太原理工大学 | A kind of Abandoned golfs coal bed gas limit pumping method |
| CN106996305A (en) * | 2017-05-22 | 2017-08-01 | 中国矿业大学 | A kind of coal mine gob Adjacent Working Face relief range assay method |
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| CN112796712A (en) * | 2021-03-26 | 2021-05-14 | 山西省煤炭地质勘查研究院 | Comprehensive extraction method for fracturing of goaf and coal seam |
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2008
- 2008-01-24 CN CNA200810019549XA patent/CN101240715A/en active Pending
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| CN101539008B (en) * | 2009-04-14 | 2012-04-04 | 赵万福 | Ground stereoscopic discharge and mining method of coal bed methane |
| CN101915086A (en) * | 2010-08-13 | 2010-12-15 | 山西晋城无烟煤矿业集团有限责任公司 | Coal mine underground gas borehole fracturing method |
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| CN101915084B (en) * | 2010-08-13 | 2011-05-11 | 山西晋城无烟煤矿业集团有限责任公司 | Process for pumping and exploiting coal bed gas by using ground well drilling and underground hole drilling |
| CN101915083B (en) * | 2010-08-13 | 2011-06-22 | 山西晋城无烟煤矿业集团有限责任公司 | Method for extracting coalbed gases from coal mines by upper and lower combination |
| CN101915085B (en) * | 2010-08-13 | 2011-09-28 | 山西晋城无烟煤矿业集团有限责任公司 | Low-air-permeability coal-bed gas extraction method |
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| CN101915083A (en) * | 2010-08-13 | 2010-12-15 | 山西晋城无烟煤矿业集团有限责任公司 | Method for extracting coalbed gases from coal mines by upper and lower combination |
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| CN102536240B (en) * | 2012-01-17 | 2015-03-11 | 河南省煤层气开发利用有限公司 | Method for preventing rock burst by adopting high-pressure fracturing |
| CN103306714B (en) * | 2013-06-09 | 2016-01-27 | 中国矿业大学 | Gas control method for drilling hole and hole three-purpose in close-range coal seam group bottom drainage roadway |
| CN103306714A (en) * | 2013-06-09 | 2013-09-18 | 中国矿业大学 | Gas control method for drilling hole and hole three-purpose in close-range coal seam group bottom drainage roadway |
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| CN105134286A (en) * | 2015-10-13 | 2015-12-09 | 山西晋煤集团技术研究院有限责任公司 | Method for extracting gas of gob of L-shaped well |
| CN107476783A (en) * | 2016-06-08 | 2017-12-15 | 中国石油天然气股份有限公司 | A kind of bottom plate develops the coalbed methane reservoir remodeling method of rotten rib coal |
| CN107476783B (en) * | 2016-06-08 | 2019-09-06 | 中国石油天然气股份有限公司 | A kind of bottom plate develops the coalbed methane reservoir remodeling method of rotten rib coal |
| CN106150541A (en) * | 2016-07-05 | 2016-11-23 | 安徽理工大学 | A kind of base plate directional drilling group and neighbouring lower protected seam gas pumping method |
| CN106150541B (en) * | 2016-07-05 | 2019-06-18 | 安徽理工大学 | A kind of bottom plate directional drilling group and neighbouring lower protected seam gas pumping method |
| CN106761585A (en) * | 2017-02-25 | 2017-05-31 | 太原理工大学 | A kind of Abandoned golfs coal bed gas limit pumping method |
| CN106996305A (en) * | 2017-05-22 | 2017-08-01 | 中国矿业大学 | A kind of coal mine gob Adjacent Working Face relief range assay method |
| CN110939407A (en) * | 2018-09-25 | 2020-03-31 | 山西省煤炭地质勘查研究院 | Double-deck overlapping goaf ground drainage well structure and recovery unit |
| CN109630189A (en) * | 2018-12-12 | 2019-04-16 | 中煤科工集团重庆研究院有限公司 | The method of highly gassy mine minery surface well improvement coal working face gas |
| CN111042791A (en) * | 2019-12-29 | 2020-04-21 | 山西晋城无烟煤矿业集团有限责任公司 | Combined coal and coal bed gas co-production method for upper and lower wells of low-permeability coal bed group |
| CN112412527A (en) * | 2020-11-20 | 2021-02-26 | 贵州盘江精煤股份有限公司 | Centralized gas treatment method for coal groups in close-distance coal seam group |
| CN112796712A (en) * | 2021-03-26 | 2021-05-14 | 山西省煤炭地质勘查研究院 | Comprehensive extraction method for fracturing of goaf and coal seam |
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