CN102852546A - 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 the single soft projecting coal bed method of taking out in advance coal road band gas in a kind of unworked country.Concrete pointer proposes a kind of method of taking out in advance coal road band gas by the ground level fractured well to single, soft, hypotonic, projecting coal bed.
Background technology
Mine gas has become the maximum harm of China's coal-mine safety in production, is " the first killer " who threatens miner's life.The control gas disaster is eliminated coal and Gas Outburst, realizes that the fundamental way that coal and gas resources green are adopted altogether is to extract coal gas out.
Increase along with the coal mine excavation degree of depth, the increase of gas bearing capacity and gas pressure, a lot of low gaseous mines develop into highly gassy mine and projecting mine gradually, and outstanding disaster is more and more serious, to such an extent as at this coal seam drilling like this to coal body slight disturbance often just can bring out coal and Gas Outburst." control coal and Gas Outburst regulation " explicitly points out the principle that protrusion-dispelling work adheres to that regional outburst prevention measures is gone ahead of the rest, local prevent outburst measure replenishes, and regional outburst prevention measures comprises the exploitation topping and takes out in advance coal-bed gas two classes.China seriously outstanding mining area is structure coal intense development district substantially entirely, and especially Henan area institute mining coal seam is commonly single, soft, hypotonic, high prominent coal seam reservoirs, and the unprotect layer can be adopted, and gas govenance can only be to take out coal-bed gas as main in advance.Coal almost is typical granulated coal or rotten rib coal entirely.But soft because of institute's mining coal seam ature of coal, permeability is low, the destruction type of coal almost is III, IV, V class coal entirely, natural crack connective relatively 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 purpose that the short time realizes the coal seam extinction and obtain the high concentration gas resource, often takes out the contour engineering input in lane take intensive cloth hole and Seam Roof And Floor rock and carries out extraction as cost.And this type of coal seam reservoirs is broken serious, and the cleat has not existed, and gas bearing capacity is large, gas pressure is high, and in coal seam internal drilling constructional difficulties, spray orifice, the hole of collapsing, plug-hole and bit freezing phenomenon are serious when drilling, and boring is beaten not dark, and concentration decline is fast, and extracting result is poor.Especially face first coal road in first exploiting field of high prominent Geological Structures In Coal Mine coal intense development, the mash gas dynamic phenomenon is more serious, and it is larger to adopt present anti-reflection technology directly coal seam reservoirs to be carried out anti-reflection enhanced transformation difficulty, 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, limited the mine safety High-efficient Production.
Chinese patent 200810230940.4 discloses " coal mine down-hole drilling hydraulic fracturing anti-reflection mash gas extraction technique ", this technology is at first chosen the pressure break place in the down-hole, determine pressure type according to coal body type, tunnel layout and structure development degree, 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 have been arranged under coal mine under the condition in digging tunnel and implemented, and still can't use for the prominent primitive coalbed of the soft height in unworked country that does not have the tunnel to arrange.
Summary of the invention
The objective of the invention is to carry out regional extinction for leading single, soft, hypotonic to the unworked country, high prominent Coal roadway band, the single soft height in a kind of unworked country method that coal road band gas is taken out in prominent coal seam in advance is provided.By surface water horizontal well in advance with the extensive extraction of the gas in the coal seam out, make coal seam gas-bearing capacity in the coal road band and gas pressure be reduced to safety standard in the protrusion-dispelling regulation, realize safely and fast driving.
The present invention is achieved through the following technical solutions:
The method that coal road band gas is taken out in the prominent coal seam of the single soft height in a kind of unworked country 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 the unworked country, perforation, pressure break, drainage and step-down, aerogenesis, and determine whether to carry out the negative pressure mash gas extraction according to producing the regimen condition
Stable when the prominent roof of single, soft, hypotonic height, easily during pore-forming, the horizontal well mash gas extraction of constructing preferentially adopting from ground to roof; During, easier pore-forming more stable than top board when the prominent seat earth of single, soft, hypotonic height, the horizontal well mash gas extraction of constructing preferentially adopting from ground to seat earth; When the prominent Seam Roof And Floor of single, soft, hypotonic height all stable, easily during pore-forming, can adopt from ground to top, coal seam, the base plate multi-branched horizontal well mash gas extraction of constructing respectively for shortening in advance the phase of taking out.
Described horizontal hole of constructing in roof is vertical to be positioned at 3 ~ 6m directly over the coal seam, transversely in the heading certain limit of intending driving, and horizontal hole drilling direction and tunnelling opposite direction.
Described horizontal hole of constructing in seat earth is vertical to be positioned at 3 ~ 6m under the coal seam, transversely in the heading certain limit of intending driving, and horizontal hole drilling direction and tunnelling opposite direction.
Described horizontal hole of constructing in roof is vertical to be positioned at 3 ~ 6m directly over the coal seam, the horizontal hole of constructing in seat earth is vertical to be positioned at 3 ~ 6m under the coal seam, transversely in the heading certain limit of intending driving, and horizontal hole drilling direction and tunnelling opposite direction.
Described horizontal well from ground construction is taked three opening structures, all is lowered to protective casing, leakiness stratum, a game clock layer sleeve pipe sealing earth's surface, and cement returns to ground; Two drive a well cements the well after entering now protective casing, and cement returns to more than the 100m of coal top; Three horizontal holes that spud in, protective casing is lowered to rear well cementation.
The horizontal well of described construction in roof, downward semi-circular orientation perforation only in horizontal circular borehole; The horizontal well of construction in seat earth, the semi-circular orientation perforation only makes progress in horizontal circular borehole; Form artificial plane of weakness with this.
Described pressure break is at a certain distance lower packet enforcement of horizontal hole section staged fracturing, intensive treatment is carried out in one section rock stratum between horizontal hole and the coal seam, extend take plan pick coal road as this section Seam Roof And Floor preexisting crack in each certain limit of axis both sides in the horizontal after making pressure break, expansion, and produce new a large amount of artificial crack, the crack that the artificial plane of weakness that Seam Roof And Floor is formed along oriented perforating through fracturing reform obtains is linked up with the coal seam as far as possible, finally play anti-reflection deblocking effect and (namely increase the gas permeability of rock stratum, remove the rock stratum to the ability of sealing up for safekeeping of gas in the coal seam), the adjoining rock of originally 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 and produces a large amount of cracks by reinforcement process and make rock stratum in the close coal seam certain limit that gas permeability increases substantially, thickness is generally about 10m, and by removing the rock stratum to the ability of sealing up for safekeeping of gas in the coal seam with the crack of coal seam conducting.
Carrying out the negative pressure mash gas extraction behind the described drainage and step-down is to utilize draining, hypotensive effect, coal-bed gas is reached below the critical desorption pressures, and in negative pressure extraction process, make constantly desorb from the coal seam, the diffusion of gas that is enclosed in the coal seam, migrate to " extraction Protective Coal Seam " seepage flow by the Fracture Networks that is communicated with the coal seam, again by the horizontal hole in " extraction Protective Coal Seam " rock stratum by extensive extraction out.The coal-bed gas that reaches to intend to dig heading and be in the certain limit of axis both sides is down to the safety standard that requires in the protrusion-dispelling regulation.
The single soft projecting coal bed method of taking out in advance coal road band gas in unworked country of the present invention, single for the unworked country, soft, hypotonic, high prominent coal seam, do not changing under original geostatic stress state, use " coal bed gas is sealed 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, move towards orientation construction concordant horizontal well along the coal road of intending driving in from ground to the Seam Roof And Floor rock stratum, if form artificial orientation's face by oriented perforating, utilize the pressure break effect of water under high pressure, intensive treatment is carried out in one section rock stratum between Seam Roof And Floor rock stratum horizontal hole and the coal seam, anti-reflection deblocking, originally this section adjoining rock of sealing coal-bed gas up for safekeeping is transformed into " the extraction Protective Coal Seam " of crack connected network prosperity, and the Fracture Networks that obtains by fracturing reform is communicated with " extraction Protective Coal Seam " with the coal seam large tracts of land, pass through drainage and step-down, the multiple disturbance of the operations such as negative pressure extraction and tunnelling etc., the gas that desorbs from the coal seam is migrated in " extraction Protective Coal Seam " rapidly by artificial crack, and then by surface water horizontal well in advance with the extensive extraction of the gas in the coal seam out, make coal seam gas-bearing capacity and gas pressure in the coal road band be reduced to the safety standard that requires in the protrusion-dispelling regulation, accomplish that really regional outburst prevention measures in advance, local prevent outburst measure replenishes, fundamentally eliminate single, soft, hypotonic, coal and Gas Outburst in the high prominent Coal roadway tunneling process are dangerous, realize safely and fast driving.
When adopting the single soft projecting coal bed method of taking out in advance coal road band gas in unworked country to carry out taking out in advance before the coal road band gas overpressure, the surface water horizontal well of implementing at one time in the section gas amount of extraction be not less than total mash gas extraction amount with all layer-through drillings of roof and floor rock gangway (drill hole density of layer-through drilling is as the criterion with the layer-through drilling averag density of implementing mine) of ground level well horizontal hole equal in length, and then the special-purpose rock of replacement roof and floor is taken out the lane, can avoid digging rock and take out the high engineering input in lane, can strengthen finding time in advance in advance of coal road band again, guarantee mine " take out; the pick; adopt " balance.
Description of drawings
Fig. 1 the present invention is directed to from ground to single soft hypotonic height the stereogram that construction level well the prominent roof is taken out coal road band gas 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 from ground to single soft hypotonic height the stereogram that construction level well the prominent seat earth is taken out coal road band gas 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 from ground to single soft hypotonic height the stereogram that the multi-branched horizontal well of constructing prominent coal seam Di Ding, the base plate is taken out coal road band gas 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.
The specific embodiment
Embodiment 1:
The method that single soft projecting coal bed top board construction surface water horizontal well is taken out coal road band gas in advance to the unworked country.Be 5.7m for thickness, single, soft, hypotonic, the high prominent coal seam 6 of the nearly level of buried depth 685m, the destruction type of this layer coal is the V class, and it is Powdered that ature of coal mostly is, 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, and average 5.27m, old top is packsand, thick 1.22-11.95 rice, average thick 5.05 meters; Coal seam immediate bottom 8 is Sandy Silt or carbonaceous mud stone, thick 0.74-17.93 rice, and average 7.00 meters, past is sandstone, thick 0.45-26.5m, average thick 10.70m.Seat earth has limestone aquifer, and upper apart from coal seam 20～30m, karst and cranny development are unbalanced.
Implementation step is as follows:
(1) according to 5 locus, tunnel of intending driving, 1 chooses solution space layout well location on ground;
(2) adopt three to drive a well body structure to roof 7 wellbore constructions, eye 2 diameters that drive a well are 311.1mm, are lowered to the J55 grade of steel protective casing of Φ 244.5mm, leakiness stratum, a game clock layer sleeve pipe sealing earth's surface, and cement returns to ground 1; Two eye 3 diameters that drive a well are 215.9mm, cement the well after being lowered to the J55 grade of steel protective casing of Φ 177.8mm, and cement returns to more than the coal 6 top 100m; Three horizontal hole 4 diameters that spud in are 152.4mm, are lowered to the J55 grade of steel protective casing sealing roof 7 of Φ 127mm.Adopting the guiding drilling technology to make three, to open horizontal hole 46 be 3 ~ 6m apart from the coal seam, for guaranteeing Erkaijing well 3 and three spud sections, 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, improves displacement efficiency by spiral flow replacement technology.
(3) perforation was prepared pressure break after drilling engineering was transferred, according to 16 bullets/m downward semi-circular orientation perforation only in horizontal circular borehole 4, according to fixed fracturing scheme the Roof Rock Strata of Coal Seam 7 between horizontal hole 4 and the coal seam 6 is implemented staged fracturing behind the perforation, the adjoining rock of 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 the negative pressure extraction, make constantly desorb from coal seam 6, the diffusion of gas that is enclosed in the coal seam 6, migrate to extraction Protective Coal Seam 9 seepage flow by the Fracture Networks that is communicated with the coal seam, again by the horizontal hole 4 in extraction Protective Coal Seam 9 rock stratum by extensive extraction out.
Embodiment 2:
The method that single soft projecting coal bed construction of bottom plates surface water horizontal well is taken out coal road band gas in advance to the unworked country.Be 4.8m for thickness, single, soft, hypotonic, the high prominent coal seam 6 of the nearly level of buried depth 720m, the destruction type of this layer coal is the III class, ature of coal mostly is chunky shape; Gas bearing capacity is 14m
3/ t, gas pressure is 1.2MPa; Immediate roof 7 plates in coal seam are black mudstone and carbonaceous mud stone, thick 2.8-7.2m, and average 5.4m, old top is middle kern stone, thick 8.1-12.3 rice, average thick 9.5 meters; Coal seam immediate bottom 8 is Sandy Silt or mud stone, thick 2.4-15.6 rice, and average 10.3 meters, past is sandstone, thick 3.5-27.8m, average thick 14.5m.Roof 7 has group sandstone crack, Shanxi artesian water, apart from coal seam 5～30m.The floor strata general integrity is better.
Implementation step is as follows:
(1) according to 5 locus, tunnel of intending driving, 1 chooses solution space layout well location on ground;
(2) adopt three to drive a well body structure to roof 7 wellbore constructions, eye 2 diameters that drive a well are 311.1mm, are lowered to the N80 grade of steel protective casing of Φ 244.5mm, leakiness stratum, a game clock layer sleeve pipe sealing earth's surface, and cement returns to ground 1; Two eye 3 diameters that drive a well are 215.9mm, are lowered to the N80 grade of steel protective casing sealing coal seam 6 of Φ 177.8mm, and cement returns to more than the 100m of coal 6 top; Three horizontal hole 4 diameters that spud in are 152.4mm, are lowered to sealing seat earth 8 behind the N80 grade of steel protective casing of Φ 127mm.Adopting the guiding drilling technology to make three, to open horizontal hole 46 be 3 ~ 6m apart from the coal seam, for guaranteeing Erkaijing well 3 and three spud sections, 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, improves displacement efficiency by spiral flow replacement technology.
(3) perforation was prepared pressure break after drilling engineering was transferred, according to 16 bullets/m semi-circular orientation perforation upwards only in horizontal circular borehole 4, according to fixed fracturing scheme the Roof Rock Strata of Coal Seam 7 between horizontal hole 4 and the coal seam 6 is implemented staged fracturing behind the perforation, the adjoining rock of 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 the negative pressure extraction, make constantly desorb from coal seam 6, the diffusion of gas that is enclosed in the coal seam 6, migrate to extraction Protective Coal Seam 9 seepage flow by the Fracture Networks that is communicated with the coal seam, again by the horizontal hole 4 in extraction Protective Coal Seam 9 rock stratum by extensive extraction out.
Embodiment 3:
The method that single soft projecting coal bed roof and floor construction ground multi-branched horizontal well is taken out coal road band gas in advance to the unworked country.Be 6.68m for thickness, single, soft, hypotonic, the high prominent coal seam 6 of the nearly level of buried depth 700m, the destruction type of this layer coal is the IV class, 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, and average 4.8m, old top is packsand, thick 3.2-16.5 rice, average thick 8.4 meters; Coal seam immediate bottom 8 is Sandy Silt or carbonaceous mud stone, thick 2.4-15.6 rice, and average 7.6 meters, past is sandstone, thick 1.8-20.6m, average thick 12.5m.Seam Roof And Floor is stable, and karst and cranny development are unbalanced.
Implementation step is as follows:
(1) according to 5 locus, tunnel of intending driving, 1 chooses solution space layout well location on ground;
(2) adopt three to drive a well body structure to roof 7 and seat earth 8 construction multi-branched horizontal wells, the horizontal well of at first in roof 7, constructing, this branch horizontal well one drive a well the eye 2 diameters be 311.1mm, be lowered to the N80 grade of steel protective casing of Φ 244.5mm, leakiness stratum, one game clock layer sleeve pipe sealing earth's surface, cement return to ground 1; Two eye 3 diameters that drive a well are 215.9mm, cement the well after being lowered to the N80 grade of steel protective casing of Φ 177.8mm, and cement returns to more than the coal 6 top 100m; Three horizontal hole 4 diameters that spud in are 152.4mm, are lowered to the N80 grade of steel protective casing sealing roof 7 of Φ 127mm.
(3) after the horizontal well drilling of construction in roof 7 finishes, construct again branch horizontal well in the seat earth, this branch horizontal well one drive a well the eye 2 diameters be 311.1mm, be lowered to the N80 grade of steel protective casing of Φ 244.5mm, leakiness stratum, one game clock layer sleeve pipe sealing earth's surface, cement return to ground 1; Two eye 3 diameters that drive a well are 215.9mm, are lowered to the N80 grade of steel protective casing sealing coal seam 6 of Φ 177.8mm, and cement returns to more than the 100m of coal 6 top; Three horizontal hole 4 diameters that spud in are 152.4mm, are lowered to the N80 grade of steel protective casing sealing seat earth 8 of Φ 127mm.Adopting the guiding drilling technology to make three, to open horizontal hole 46 be 3 ~ 6m apart from the coal seam, for guaranteeing Erkaijing well 3 and three spud sections, 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, improves displacement efficiency by spiral flow replacement technology.
(3) perforation was prepared pressure break after drilling engineering was transferred, carry out perforation according to 16 bullets/m, the semi-circular orientation perforation only makes progress in the horizontal circular borehole 4 of branch in roof 7, the semi-circular orientation perforation only makes progress in the horizontal circular borehole 4 of branch in seat earth 8, respectively the Roof Rock Strata of Coal Seam 7 between horizontal hole 4 and the coal seam 6 and seat earth 8 are implemented staged fracturing according to fixed fracturing scheme behind the perforation, the adjoining rock of 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 the negative pressure extraction, make constantly desorb from coal seam 6, the diffusion of gas that is enclosed in the coal seam 6, migrate to extraction Protective Coal Seam 9 seepage flow by the Fracture Networks that is communicated with the coal seam, again by the horizontal hole 4 in extraction Protective Coal Seam 9 rock stratum by extensive extraction out.
Claims (10)
1. single soft projecting coal bed method of taking out in advance coal road band gas 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 the unworked country, perforation, pressure break, drainage and step-down, aerogenesis, and determine whether to carry out the negative pressure mash gas extraction according to producing the regimen condition.
2. the single soft projecting coal bed method of taking out in advance coal road band gas in unworked country according to claim 1, it is characterized in that: stable when the prominent roof of single, soft, hypotonic height, easily during pore-forming, the horizontal well mash gas extraction of constructing adopting from ground to roof; During, easier pore-forming more stable than top board when the prominent seat earth of single, soft, hypotonic height, the horizontal well mash gas extraction of constructing adopting from ground to seat earth; When the prominent Seam Roof And Floor of single, soft, hypotonic height all stable, easily during pore-forming, can adopt from ground to top, coal seam, the base plate multi-branched horizontal well mash gas extraction of constructing respectively for shortening in advance the phase of taking out.
3. the single soft projecting coal bed method of taking out in advance coal road band gas in unworked country according to claim 2, it is characterized in that: vertical 3 ~ 6m directly over the coal seam, horizontal hole drilling direction and the tunnelling opposite direction of being positioned at of described horizontal hole of in roof, constructing.
4. the single soft projecting coal bed method of taking out in advance coal road band gas in unworked country according to claim 2, it is characterized in that: vertical 3 ~ 6m under the coal seam, horizontal hole drilling direction and the tunnelling opposite direction of being positioned at of described horizontal hole of in seat earth, constructing.
5. the single soft projecting coal bed method of taking out in advance coal road band gas in unworked country according to claim 2, it is characterized in that: adopt from ground to the top, coal seam, when base plate is constructed respectively the multi-branched horizontal well mash gas extraction, described horizontal hole of constructing in roof is vertical to be positioned at 3 ~ 6m directly over the coal seam, vertical 3 ~ 6m under the coal seam, horizontal hole drilling direction and the tunnelling opposite direction of being positioned at of the horizontal hole of in seat earth, constructing.
6. the single soft projecting coal bed method of taking out in advance coal road band gas in unworked country according to claim 1, it is characterized in that: described horizontal well from ground construction is taked three opening structures, all be lowered to protective casing, leakiness stratum, a game clock layer sleeve pipe sealing earth's surface, cement returns to ground; Two drive a well cements the well after entering now protective casing, and cement returns to more than the 100m of coal top; Three horizontal holes that spud in, protective casing is lowered to rear well cementation.
7. the prominent coal seam of the single soft height in the unworked country according to claim 1 method of taking out in advance coal road band gas is characterized in that: the horizontal well of described construction in roof, downward semi-circular orientation perforation only in horizontal circular borehole; The horizontal well of construction in seat earth, the semi-circular orientation perforation only makes progress in horizontal circular borehole; Form artificial plane of weakness with this.
8. the prominent coal seam of the single soft height in the unworked country according to claim 1 method of taking out in advance coal road band gas, it is characterized in that: described pressure break is at a certain distance lower packet enforcement of horizontal hole section staged fracturing, intensive treatment is carried out in one section rock stratum between horizontal hole and the coal seam, extend take plan pick coal road as this section Seam Roof And Floor preexisting crack in each certain limit of axis both sides in the horizontal after making pressure break, expansion, and produce new a large amount of artificial crack, the crack that the artificial plane of weakness that Seam Roof And Floor is formed along oriented perforating through fracturing reform obtains is linked up with the coal seam as far as possible, finally play anti-reflection deblocking effect and (namely increase the gas permeability of rock stratum, remove the rock stratum to the ability of sealing up for safekeeping of gas in the coal seam), the adjoining rock of originally sealing coal-bed gas up for safekeeping is transformed into " the extraction Protective Coal Seam " of Fracture Networks prosperity.
9. the prominent coal seam of the single soft height in the unworked country according to claim 8 method of taking out in advance coal road band gas, it is characterized in that: described extraction Protective Coal Seam refers to and produces a large amount of cracks by reinforcement process and make rock stratum in the close coal seam certain limit that gas permeability increases substantially, thickness is 8-12m, and by removing the rock stratum to the ability of sealing up for safekeeping of gas in the coal seam with the crack of coal seam conducting.
10. the prominent coal seam of the single soft height in the unworked country according to claim 1 method of taking out in advance coal road band gas, it is characterized in that: carrying out the negative pressure mash gas extraction behind the described drainage and step-down is to utilize draining, hypotensive effect, coal-bed gas is reached below the critical desorption pressures, and in negative pressure extraction process, make constantly desorb from the coal seam, the diffusion of gas that is enclosed in the coal seam, migrate to " extraction Protective Coal Seam " seepage flow by the Fracture Networks that is communicated with the coal seam, again by the horizontal hole in " extraction Protective Coal Seam " rock stratum by extensive extraction out; The coal-bed gas that reaches to intend to dig heading and be in the certain limit of axis both sides is down to the safety standard that requires in the protrusion-dispelling regulation.
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| CN110318674A (en) * | 2019-06-13 | 2019-10-11 | 太原理工大学 | A kind of method of back fracturing protrusion-dispelling |
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| CN114233369A (en) * | 2021-12-28 | 2022-03-25 | 山西晋煤集团技术研究院有限责任公司 | Method for accurately eliminating coal and gas outburst by combining up and down of well |
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