CN102852546B - Method for pre-pumping coal roadway stripe gas of single soft protruded coal seam of unexploited area - Google Patents
Method for pre-pumping coal roadway stripe gas of single soft protruded coal seam of unexploited area Download PDFInfo
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Abstract
The invention provides a method for pre-pumping coal roadway stripe gas of a single soft protruded coal seam of an unexploited area and relates to the technical field of gas pumping. Through the method, outburst removal of the area with a single soft hypotonic protruded coal seam coal roadway stripe can be achieved. The method for pre-pumping the coal roadway stripe gas of the single soft protruded coal seam of the unexploited area comprises building a concordant layer horizontal well which is 3-6m away from the coal seam from the ground to a top plate and a base plate of the single soft protruded coal seam of the unexploited area, performing segmented fracturing after oriented perforating, enabling top plate and base plate rock terrane where coal seam gas is sealed and stored originally to be transformed into a pumping liberation layer with developed fracture networks, enabling the pumping liberation layer to be communicated with the coal seam in a large-area mode through the fracture networks, performing decompression and aerogenesis by dewatering, determining whether to perform negative pressure pumping according to water production conditions, enabling the coal seam gas to be desorbed and diffused continuously, and pumping the gas massively by pumping a horizontal well opening in the liberation layer. By pumping the gas massively, the outburst prevention index in the coal roadway stripe can be reduced to below the safety standard in the outburst prevention rules, and safe and speedy drivage is achieved.
Description
Technical field
The present invention relates to a kind of single soft projecting coal bed method of taking out coal roadway stripe gas in advance in unworked country.Concrete pointer, to single, soft, hypotonic, projecting coal bed, proposes a kind of method of being taken out coal roadway stripe gas by ground level fractured well in advance.
Background technology
Mine gas has become the maximum harm of China's coal-mine safety in production, is to threaten miner's life " the first killer ".Control gas disaster, eliminates coal and gas prominent, and realizing the green fundamental way of adopting altogether of coal and non-coal resource is extract coal gas out.
Along with the increase of the coal mine excavation degree of depth, the increase of gas bearing capacity and gas pressure, a lot of low gaseous mine develops into highly gassy mine and projecting mine gradually, and outstanding disaster is more and more serious, to such an extent as to often just coal and gas prominent can be brought out in the disturbance that this coal seam drilling is slight to coal body like this." control coal and gas prominent specifies " explicitly points out the principle that outburst prevention work adheres to that region outburst prevention measures is leading, local prevent outburst measure supplements, and region outburst prevention measures comprises exploitation topping and takes out coal-bed gas two class in advance.China seriously outstanding mining area is deformation coal intense development district substantially entirely, and especially Henan area institute mining coal seam is commonly single, soft, hypotonic, height dashes forward coal seam reservoirs, and unprotect layer can be adopted, and gas govenance can only to take out coal-bed gas in advance.Coal is almost typical granulated coal or rotten rib coal entirely.But because institute's mining coal seam ature of coal is soft, permeability is low, the Failure type of coal is almost III, IV, V class coal entirely, the connectedness of natural fissure is poor, if do not take anti-reflection measure, extracting result is very poor, the single underground gas extraction that carries out is difficult to the object that the short time realizes coal seam extinction and acquisition high concentration gas resource, often drops into as cost carries out extraction with the contour engineering in intensive cloth hole and Seam Roof And Floor Yan Chou lane.And this type of coal seam reservoirs is broken serious, cleat has not existed, and gas bearing capacity is large, gas pressure is high, and in coal seam internal drilling constructional difficulties, when drilling, spray orifice, collapse hole, plug-hole and bit freezing phenomenon are serious, and boring is beaten not dark, and concentration decline is fast, and extracting result is poor.Especially in the face of the first bar coal road in first exploiting field of high prominent Geological Structures In Coal Mine coal intense development, mash gas dynamic phenomenon is more serious, and it is larger to adopt current anti-reflection technology directly to carry out anti-reflection enhanced transformation difficulty to coal seam reservoirs, cause high prominent heading driving speed very low, every drill footage per month only has about 30m, be difficult to reach and take out, adopt, dig balance, limit mine safety High-efficient Production.
Chinese patent 200810230940.4 discloses " coal mine down-hole drilling hydraulic fracturing anti-reflection mash gas extraction technique ", first this technology chooses pressure break place in down-hole, according to coal body type, roadway layout and structured fault zone determination pressure type, adopt roof and floor concordant boring and hydraulic fracture, the fracturing of roof and floor layer-through drilling, this coal seam concordant boring and hydraulic fracture or this coal seam layer-through drilling hydraulic fracturing technology, carry out the anti-reflection draining coal seam gas of pressure break.But this technology can only be implemented under underground coal mine has arranged the condition in digging tunnel, still cannot apply for there is no the soft height in the unworked country of roadway layout primitive coalbed of dashing forward.
Summary of the invention
The object of the invention is in order to advanced single to unworked country, soft, hypotonic, high prominent Coal roadway band carries out region extinction, provide the single soft height in a kind of unworked country coal seam of dashing forward to take out the method for coal roadway stripe gas in advance.By surface water horizontal well in advance by extensive for the gas in coal seam extraction out, make the coal seam gas-bearing capacity in coal roadway stripe and gas pressure be reduced to protrusion-dispelling specify in safety standard, realize tunnel safely and fast.
The present invention is achieved through the following technical solutions:
The method of coal roadway stripe gas is taken out in the single soft height in a kind of unworked country coal seam of dashing forward in advance, it is characterized in that: use for reference surface water horizontal well cbm development technique, single soft projecting coal bed top (end) the plate construction concordant horizontal well from ground to unworked country, perforation, pressure break, drainage and step-down, aerogenesis, and determine whether to carry out negative pressure mash gas extraction according to product regimen condition
When single, soft, hypotonic height dash forward roof stable, easily pore-forming time, preferentially adopt the horizontal well mash gas extraction of constructing to roof from ground; When single, soft, hypotonic height dash forward that seat earth is more stable than top board, easier pore-forming time, preferentially adopt the horizontal well mash gas extraction of constructing to seat earth from ground; When single, soft, hypotonic height dash forward Seam Roof And Floor all stable, easily pore-forming time, in order to shorten, the phase of taking out in advance can adopt from ground to top, coal seam, base plate constructs multi-branched horizontal well mash gas extraction respectively.
Be positioned at 3 ~ 6m directly over coal seam on the described horizontal hole of constructing in roof is vertical, transversely in the heading certain limit apart from plan driving, and horizontal hole drilling direction is contrary with tunnelling direction.
Be positioned at 3 ~ 6m immediately below coal seam on the described horizontal hole of constructing in seat earth is vertical, transversely in the heading certain limit apart from plan driving, and horizontal hole drilling direction is contrary with tunnelling direction.
3 ~ 6m directly over coal seam is positioned on the described horizontal hole of constructing in roof is vertical, 3 ~ 6m immediately below coal seam is positioned on the horizontal hole of constructing in seat earth is vertical, transversely in the heading certain limit apart from plan driving, and horizontal hole drilling direction is contrary with tunnelling direction.
Described takes three opening structures from the horizontal well of ground construction, enters protective casing all down, and one opens leakiness stratum, surface pipe sealing earth's surface, and cement returns to ground; Two drive a well enter protective casing now after cement the well, cement returns to coal top more than 100m; Three spud in horizontal hole, enter rear well cementation under protective casing.
The horizontal well of described construction in roof, only downward semi-circular orientation perforation in horizontal circular borehole; The horizontal well of construction in seat earth, only upwards semi-circular orientation perforation in horizontal circular borehole; Artificial plane of weakness is formed with this.
Described pressure break is in horizontal hole section lower packet enforcement at a certain distance staged fracturing, intensive treatment is carried out to section rock stratum of between horizontal hole and coal seam, in the horizontal to intend digging coal road for this section of Seam Roof And Floor preexisting crack extension in each certain limit in axis both sides after making pressure break, expansion, and produce new a large amount of artificial crack, the crack making Seam Roof And Floor obtain along the artificial plane of weakness that oriented perforating is formed through fracturing reform is in the vertical linked up with coal seam as far as possible, finally play anti-reflection deblocking effect and (namely increase the gas permeability of rock stratum, remove rock stratum and ability is sealed up for safekeeping to gas in coal seam), originally the adjoining rock sealing coal-bed gas up for safekeeping is transformed into " the extraction Protective Coal Seam " of Fracture Networks prosperity.
Described extraction Protective Coal Seam refers to the rock stratum produced by reinforcement process in close coal seam certain limit that a large amount of crack makes gas permeability increase substantially, thickness is generally about 10m, and seals ability by the releasing rock stratum, crack with coal seam conducting up for safekeeping to gas in coal seam.
Carrying out negative pressure mash gas extraction after described drainage and step-down is utilize draining, hypotensive effect, coal-bed gas is made to reach below critical desorption pressures, and in negative pressure extraction process, make gas constantly desorb from coal seam, the diffusion be enclosed in coal seam, migrated to " extraction Protective Coal Seam " seepage flow by the Fracture Networks be communicated with coal seam, then by the horizontal hole in " extraction Protective Coal Seam " rock stratum by extensive extraction out.Reach to intend to dig heading for the coal-bed gas in the certain limit of axis both sides be down to protrusion-dispelling specify in the safety standard of requirement.
The single soft projecting coal bed method of taking out coal roadway stripe gas in advance in unworked country of the present invention, single for unworked country, soft, hypotonic, high prominent coal seam, do not changing under original crustal stress states, application " coal bed gas seals mechanism up for safekeeping ", " coal bed gas migration mechanism ", " coalbed methane reservoir strengthening mechanism ", " gas pumping mechanism of disturbance ", use for reference surface water horizontal well cbm development technique, in Seam Roof And Floor rock stratum, orientation construction concordant horizontal well is moved towards along the coal road intending driving from ground, if form artificial orientation face by oriented perforating, utilize the pressure break effect of water under high pressure, intensive treatment is carried out to section rock stratum of between Seam Roof And Floor rock stratum horizontal hole and coal seam, anti-reflection deblocking, originally this section of adjoining rock sealing coal-bed gas up for safekeeping is transformed into " the extraction Protective Coal Seam " of crack connected network prosperity, and by the Fracture Networks that fracturing reform obtains, " extraction Protective Coal Seam " is communicated with coal seam large area, pass through drainage and step-down, the multiple disturbance etc. of the operations such as negative pressure extraction and tunnelling, the gas desorbed from coal seam is made to migrate rapidly in " extraction Protective Coal Seam " by artificial crack, and then by surface water horizontal well in advance by extensive for the gas in coal seam extraction out, make the coal seam gas-bearing capacity in coal roadway stripe and gas pressure be reduced to protrusion-dispelling specify in require safety standard, really accomplish that region outburst prevention measures is leading, local prevent outburst measure supplements, fundamentally eliminate single, soft, hypotonic, coal and gas prominent in high prominent Coal roadway tunneling process is dangerous, realize tunneling safely and fast.
When taking out in advance before adopting the single soft projecting coal bed method of taking out coal roadway stripe gas in advance in unworked country to carry out coal roadway stripe gas overpressure, the surface water horizontal well implemented at one time in section the gas amount of extraction be not less than total mash gas extraction amount of the roof and floor rock gangway all layer-through drilling (drill hole density of layer-through drilling with the layer-through drilling averag density of implementing mine be as the criterion) equal with ground level well radial bore length, and then replace the special Yan Chou lane of roof and floor, digging Yan Chou lane high engineering can be avoided to drop into, the advanced of coal roadway stripe can be strengthened again find time in advance, guarantee that mine " is taken out, pick, adopt " balance.
Accompanying drawing explanation
Fig. 1 the present invention is directed to the stereogram taking out coal roadway stripe gas from ground to construction level well single soft hypotonic height dashes forward roof in advance;
Fig. 2 is the A-A ' sectional drawing before Fig. 1 implements pressure break;
Fig. 3 is the B-B ' sectional drawing before Fig. 1 implements pressure break;
Fig. 4 is that Fig. 1 implements post-fracturing A-A ' sectional drawing;
Fig. 5 is that Fig. 1 implements post-fracturing B-B ' sectional drawing;
Fig. 6 the present invention is directed to the stereogram taking out coal roadway stripe gas from ground to construction level well single soft hypotonic height dashes forward seat earth in advance;
Fig. 7 is the A-A ' sectional drawing before Fig. 6 implements pressure break;
Fig. 8 is the B-B ' sectional drawing before Fig. 6 implements pressure break;
Fig. 9 is that Fig. 6 implements post-fracturing A-A ' sectional drawing;
Figure 10 is that Fig. 6 implements post-fracturing B-B ' sectional drawing;
Figure 11 the present invention is directed to the stereogram taking out coal roadway stripe gas from ground to multi-branched horizontal well of constructing single soft hypotonic height dashes forward coal seam Di Ding, base plate in advance;
Figure 12 is the A-A ' sectional drawing before Figure 11 implements pressure break;
Figure 13 is the B-B ' sectional drawing before Figure 11 implements pressure break;
Figure 14 is that Figure 11 implements post-fracturing A-A ' sectional drawing;
Figure 15 is that Figure 11 implements post-fracturing B-B ' sectional drawing.
Detailed description of the invention
Embodiment 1:
To unworked country, single soft projecting coal bed top board construction surface water horizontal well takes out the method for coal roadway stripe gas in advance.Be single, soft, hypotonic, the high prominent coal seam 6 of the nearly level of 5.7m, buried depth 685m for thickness, the Failure type of this layer of coal is V class, and ature of coal mostly is Powdered, and coal is rotten rib coal; Gas bearing capacity is 21m
3/ t, gas pressure is 1.5MPa; Coal seam immediate roof 7 is Sandy Silt and aleuritic texture rock, thick 1.96-9.97m, average 5.27m, and old top is packsand, thick 1.22-11.95 rice, on average thick 5.05 meters; Coal seam immediate bottom 8 is Sandy Silt or charcoal mudrock, thick 0.74-17.93 rice, average 7.00 meters, and past is sandstone, thick 0.45-26.5m, average thick 10.70m.Seat earth has limestone aquifer, upper apart from coal seam 20 ~ 30m, karst and cranny development unbalanced.
implementation step is as follows:
(1) according to the locus, tunnel 5 of intending driving, choose solution space on ground 1 and arrange well location;
(2) adopt and three drive a well body structure to roof 7 wellbore construction, eye 2 diameter that drives a well is 311.1mm, under enter the J55 grade of steel protective casing of Φ 244.5mm, one opens leakiness stratum, surface pipe sealing earth's surface, and cement returns to ground 1; Two eye 3 diameters that drive a well are 215.9mm, under enter the J55 grade of steel protective casing of Φ 177.8mm after cement the well, cement returns to coal 6 and pushes up more than 100m; Three horizontal hole 4 diameters that spud in are 152.4mm, under enter the J55 grade of steel protective casing sealing roof 7 of Φ 127mm.Adopting guide digging technology to make three to open horizontal hole 4 apart from coal seam 6 is 3 ~ 6m, for ensureing Erkaijing well 3 and three spud section 4 cementing qualities, make bunch tube placed in the middle, open high angle hole section 3 two and adopt the wheeled rigidity centralizer of spiral roll and bouble-bow elastic centralizer cross-reference, three open horizontal segment 4 uses rigid vortex centralizer, replaces technology improve displacement efficiency by spiral flow.
(3) drilling engineering is transferred rear perforation and is prepared pressure break, according to 16 bullets/m only downward semi-circular orientation perforation in horizontal circular borehole 4, according to fixed fracturing scheme, staged fracturing is implemented to the Roof Rock Strata of Coal Seam 7 between horizontal hole 4 and coal seam 6 after perforation, the adjoining rock originally sealing coal-bed gas up for safekeeping is transformed into the extraction Protective Coal Seam 9 of crack connected network prosperity.
(4) after ground shut-in well, draining, step-down, utilize negative pressure extraction, make gas constantly desorb from coal seam 6, the diffusion be enclosed in coal seam 6, migrated to extraction Protective Coal Seam 9 seepage flow by the Fracture Networks be communicated with coal seam, then by the horizontal hole 4 in extraction Protective Coal Seam 9 rock stratum by extensive extraction out.
Embodiment 2:
To unworked country, single soft projecting coal bed construction of bottom plates surface water horizontal well takes out the method for coal roadway stripe gas in advance.Be single, soft, hypotonic, the high prominent coal seam 6 of the nearly level of 4.8m, buried depth 720m for thickness, the Failure type of this layer of coal is III class, and ature of coal mostly is chunky shape; Gas bearing capacity is 14m
3/ t, gas pressure is 1.2MPa; Coal seam immediate roof 7 plate is black mudstone and charcoal mudrock, thick 2.8-7.2m, average 5.4m, and old top is middle kern stone, thick 8.1-12.3 rice, on average thick 9.5 meters; Coal seam immediate bottom 8 is Sandy Silt or mud stone, thick 2.4-15.6 rice, average 10.3 meters, and past is sandstone, thick 3.5-27.8m, average thick 14.5m.Roof 7 has Shanxi group sandstone crack artesian water, apart from coal seam 5 ~ 30m.Floor strata general integrity is better.
implementation step is as follows:
(1) according to the locus, tunnel 5 of intending driving, choose solution space on ground 1 and arrange well location;
(2) adopt and three drive a well body structure to roof 7 wellbore construction, eye 2 diameter that drives a well is 311.1mm, under enter the N80 grade of steel protective casing of Φ 244.5mm, one opens leakiness stratum, surface pipe sealing earth's surface, and cement returns to ground 1; Two eye 3 diameters that drive a well are 215.9mm, under enter the N80 grade of steel protective casing sealing coal seam 6 of Φ 177.8mm, cement returns to coal 6 and pushes up more than 100m; Three horizontal hole 4 diameters that spud in are 152.4mm, under enter sealing seat earth 8 after the N80 grade of steel protective casing of Φ 127mm.Adopting guide digging technology to make three to open horizontal hole 4 apart from coal seam 6 is 3 ~ 6m, for ensureing Erkaijing well 3 and three spud section 4 cementing qualities, make bunch tube placed in the middle, open high angle hole section 3 two and adopt the wheeled rigidity centralizer of spiral roll and bouble-bow elastic centralizer cross-reference, three open horizontal segment 4 uses rigid vortex centralizer, replaces technology improve displacement efficiency by spiral flow.
(3) drilling engineering is transferred rear perforation and is prepared pressure break, according to 16 bullets/m only upwards semi-circular orientation perforation in horizontal circular borehole 4, according to fixed fracturing scheme, staged fracturing is implemented to the Roof Rock Strata of Coal Seam 7 between horizontal hole 4 and coal seam 6 after perforation, the adjoining rock originally sealing coal-bed gas up for safekeeping is transformed into the extraction Protective Coal Seam 9 of crack connected network prosperity.
(4) after ground shut-in well, draining, step-down, utilize negative pressure extraction, make gas constantly desorb from coal seam 6, the diffusion be enclosed in coal seam 6, migrated to extraction Protective Coal Seam 9 seepage flow by the Fracture Networks be communicated with coal seam, then by the horizontal hole 4 in extraction Protective Coal Seam 9 rock stratum by extensive extraction out.
Embodiment 3:
To unworked country, single soft projecting coal bed roof and floor construction ground multi-branched horizontal well takes out the method for coal roadway stripe gas in advance.Be single, soft, hypotonic, the high prominent coal seam 6 of the nearly level of 6.68m, buried depth 700m for thickness, the Failure type of this layer of coal is IV class, and ature of coal mostly is granular and chunky shape; Gas bearing capacity is 28m
3/ t, gas pressure is 1.7MPa; Coal seam immediate roof 7 is Sandy Silt, thick 2.6-6.9m, average 4.8m, and old top is packsand, thick 3.2-16.5 rice, on average thick 8.4 meters; Coal seam immediate bottom 8 is Sandy Silt or charcoal mudrock, thick 2.4-15.6 rice, average 7.6 meters, and past is sandstone, thick 1.8-20.6m, average thick 12.5m.Seam Roof And Floor stablize, karst and cranny development unbalanced.
implementation step is as follows:
(1) according to the locus, tunnel 5 of intending driving, choose solution space on ground 1 and arrange well location;
(2) three body structures that drive a well are adopted to construct multi-branched horizontal well to roof 7 and seat earth 8, first the horizontal well of construction in roof 7, this branch horizontal well one eye 2 diameter that drives a well is 311.1mm, under enter the N80 grade of steel protective casing of Φ 244.5mm, one opens leakiness stratum, surface pipe sealing earth's surface, and cement returns to ground 1; Two eye 3 diameters that drive a well are 215.9mm, under enter the N80 grade of steel protective casing of Φ 177.8mm after cement the well, cement returns to coal 6 and pushes up more than 100m; Three horizontal hole 4 diameters that spud in are 152.4mm, under enter the N80 grade of steel protective casing sealing roof 7 of Φ 127mm.
(3) after the horizontal well drilling of construction in roof 7 terminates, branch horizontal well again in construction coal base plate, this branch horizontal well one eye 2 diameter that drives a well is 311.1mm, under enter the N80 grade of steel protective casing of Φ 244.5mm, one opens leakiness stratum, surface pipe sealing earth's surface, and cement returns to ground 1; Two eye 3 diameters that drive a well are 215.9mm, under enter the N80 grade of steel protective casing sealing coal seam 6 of Φ 177.8mm, cement returns to coal 6 and pushes up more than 100m; Three horizontal hole 4 diameters that spud in are 152.4mm, under enter the N80 grade of steel protective casing sealing seat earth 8 of Φ 127mm.Adopting guide digging technology to make three to open horizontal hole 4 apart from coal seam 6 is 3 ~ 6m, for ensureing Erkaijing well 3 and three spud section 4 cementing qualities, make bunch tube placed in the middle, open high angle hole section 3 two and adopt the wheeled rigidity centralizer of spiral roll and bouble-bow elastic centralizer cross-reference, three open horizontal segment 4 uses rigid vortex centralizer, replaces technology improve displacement efficiency by spiral flow.
(3) drilling engineering is transferred rear perforation and is prepared pressure break, perforation is carried out according to 16 bullets/m, only upwards semi-circular orientation perforation in branch levels circular borehole 4 in roof 7, only upwards semi-circular orientation perforation in branch levels circular borehole 4 in seat earth 8, respectively staged fracturing is implemented to the Roof Rock Strata of Coal Seam 7 between horizontal hole 4 and coal seam 6 and seat earth 8 according to fixed fracturing scheme after perforation, the adjoining rock originally sealing coal-bed gas up for safekeeping is transformed into the extraction Protective Coal Seam 9 of crack connected network prosperity.
(4) after ground shut-in well, draining, step-down, utilize negative pressure extraction, make gas constantly desorb from coal seam 6, the diffusion be enclosed in coal seam 6, migrated to extraction Protective Coal Seam 9 seepage flow by the Fracture Networks be communicated with coal seam, then by the horizontal hole 4 in extraction Protective Coal Seam 9 rock stratum by extensive extraction out.
Claims (3)
1. the single soft projecting coal bed method of taking out coal roadway stripe gas in advance in unworked country, it is characterized in that: adopt surface water horizontal well cbm development technique, single soft projecting coal bed top or construction of bottom plates concordant horizontal well from ground to unworked country, perforation, pressure break, drainage and step-down, aerogenesis, and determine whether to carry out negative pressure mash gas extraction according to product regimen condition;
Adopt from ground to top, coal seam, base plate constructs multi-branched horizontal well mash gas extraction respectively, 3 ~ 6m directly over coal seam is positioned on the described horizontal hole of constructing in roof is vertical, be positioned at 3 ~ 6m immediately below coal seam on the horizontal hole of constructing in seat earth is vertical, horizontal hole drilling direction is contrary with tunnelling direction;
Described takes three opening structures from the horizontal well of ground construction, enters protective casing all down, and one opens leakiness stratum, surface pipe sealing earth's surface, and cement returns to ground; Two drive a well enter protective casing now after cement the well, cement returns to coal top more than 100m; Three spud in horizontal hole, enter rear well cementation under protective casing;
Described pressure break is in horizontal hole section lower packet enforcement at a certain distance staged fracturing, intensive treatment is carried out to section rock stratum of between horizontal hole and coal seam, in the horizontal to intend digging coal road for this section of Seam Roof And Floor preexisting crack extension in each certain limit in axis both sides after making pressure break, expansion, and produce new a large amount of artificial crack, the crack making Seam Roof And Floor obtain along the artificial plane of weakness that oriented perforating is formed through fracturing reform is in the vertical linked up with coal seam as far as possible, finally play anti-reflection deblocking effect, namely the gas permeability of rock stratum is increased, remove rock stratum and ability is sealed up for safekeeping to gas in coal seam, originally the adjoining rock sealing coal-bed gas up for safekeeping is transformed into " the extraction Protective Coal Seam " of Fracture Networks prosperity.
2. the single soft projecting coal bed method of taking out coal roadway stripe gas in advance in unworked country according to claim 1, it is characterized in that: described extraction Protective Coal Seam refers to the rock stratum produced by reinforcement process in close coal seam certain limit that a large amount of crack makes gas permeability increase substantially, thickness is 8-12m, and seals ability by the releasing rock stratum, crack with coal seam conducting up for safekeeping to gas in coal seam.
3. the single soft projecting coal bed method of taking out coal roadway stripe gas in advance in unworked country according to claim 1, it is characterized in that: carrying out negative pressure mash gas extraction after described drainage and step-down is utilize draining, hypotensive effect, coal-bed gas is made to reach below critical desorption pressures, and in negative pressure extraction process, make gas constantly desorb from coal seam, the diffusion be enclosed in coal seam, migrated to " extraction Protective Coal Seam " seepage flow by the Fracture Networks be communicated with coal seam, then by the horizontal hole in " extraction Protective Coal Seam " rock stratum by extensive extraction out; Reach to intend to dig heading for the coal-bed gas in the certain limit of axis both sides be down to protrusion-dispelling specify in the safety standard of requirement.
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