CN102635388A - Interaction permeability-increasing method of pre-splitting blasting and hydraulic cracking of coal seam - Google Patents
Interaction permeability-increasing method of pre-splitting blasting and hydraulic cracking of coal seam Download PDFInfo
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- CN102635388A CN102635388A CN201210043595XA CN201210043595A CN102635388A CN 102635388 A CN102635388 A CN 102635388A CN 201210043595X A CN201210043595X A CN 201210043595XA CN 201210043595 A CN201210043595 A CN 201210043595A CN 102635388 A CN102635388 A CN 102635388A
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Abstract
The invention relates to an interaction permeability-increasing method of pre-splitting blasting and hydraulic cracking of a coal seam, comprising the following steps of: (1) forming blasting holes in coal; (3) implementing pre-splitting blasting; (3) forming cracking drilling holes outside the influence range of the blasting holes and sealing the holes; (4) utilizing a hydraulic cracking technology to penetrate through the coal between the cracking drilling holes and the blasting holes; damaging a dense hard shell on the periphery of the blasting holes to form more cracks between the drilling holes; and carrying out coal scraps through high-pressure water. The interaction permeability-increasing method has the beneficial effects that: under the precondition of reducing 20-50% of the measuring drilling holes, a pressure unloading range of the coal is increased, the air permeability of a coal seam is improved by 20-100 times, a gas extracting effect is improved by more than 20%, blasting drilling holes and the measuring drilling holes are effectively reduced, pre-extracting time is reduced by more than 1/3 and gas damages are reduced to the greatest extent.
Description
Technical field
The present invention relates to presplit blasting of a kind of coal seam and fracturing couplet and make anti-reflection method, be specially adapted to the reinforcement extraction of high gas low air permeability coal seam gas.
Background technology
Mostly China's coal-mine is high gas low-permeable mine, and gas accident accounts for the largest percentage in all kinds of heavy, serious accidents of mine, and is the most serious to the loss that mine causes.Along with the high-efficiency intensifying production and the increase of the seam mining degree of depth of coal production, gas emission is increasing, the coal seam permeability reduction, and projecting coal bed quantity also is increase trend, and coal and gas outburst mine also increases thereupon.The gas disaster has become the key factor of restriction high-efficiency intensifying production development and safety in production.Therefore, how effectively to solve a low extraction difficult problem of passing through the coal seam, Safety of Coal Mine Production is had crucial meaning.
Both at home and abroad the coal scientific research personnel has carried out extensive studies to the problems referred to above, has successively tested multinomial anti-reflection technical measures, mainly comprises deep hole loosening blasting and Deep-hole Controlled Blasting, hydraulic flushing in hole, hydraulic slotted liner technique, adds sand and cause to split and take out in advance etc.The drilling construction engineering quantity is big, working procedure is complicated and engineering drops into problems such as high, that effectively influence basin is little, the extraction time is long but these method majorities exist; Need take other more effectively anti-reflection methods of release; Enlarge the effective influence basin of boring, improve this coal-bed gas extraction effect.
At present existing patent " deep hole control pressure relief blasting protrusion-dispelling technology, technology and equipment ", its patent of invention number be CN91100058.5, and open day is on October 2nd, 1991; Publication number is CN1055036; Its specific embodiments is: the driving face placement diameter be the boring of 100 ~ 150mm as control hole, control hole plays the effect of controlled blasting direction, diameter is that the powder charge hole of 40 ~ 50mm is a shot hole; Hole depth is 20 ~ 30mm, line explosion behind the powder charge sealing of hole.Its shortcoming is, drill holes is many, and presplit blasting release scope is little, and in the borehole circumference certain diameter, forms fine and close duricrust easily, influence gas pumping in larger scope; Owing to coal body is not discharged, gas permeability of coal seam reduces in time gradually simultaneously.
The existing paper of delivering relates to " presplit blasting " all to be to the concrete application of patent " deep hole control pressure relief blasting protrusion-dispelling technology, technology and equipment " or on the patent basis, to improve, and existing shortcoming is not improved effectively.
Summary of the invention
The technical problem that the present invention will solve provides the presplit blasting of a kind of coal seam and the fracturing couplet is made anti-reflection method, adopts this method can improve gas permeability of coal seam effectively, improves the gas pumping effect, reduces the extraction time effectively, reduces the gas disaster to greatest extent.
In order to solve the problem that prior art exists, the technical scheme that the present invention adopts is:
Coal seam presplit blasting and fracturing join makes anti-reflection method, includes following steps:
1. construction blasting hole in coal body; 2. implement presplit blasting; 3. the pressure break of outside the shot hole influence basin, constructing boring and sealing of hole; 4. adopt hydraulic fracturing technology that coal body between pressure break boring and the shot hole is pressed and wear, destroy shot hole fine and close duricrust on every side, make to form more crack between the boring, and carry out ickings through water under high pressure.
Described presplit blasting is a kind of in common presplit blasting, control presplit blasting, the deep hole presplit blasting.
The quantity of the shot hole in the described coal body is at least one.
Described pressure break boring is common boring or the boring of the gathering sill with orientation.
The boring of described shot hole and pressure break is connected to mine gas extraction system through the extraction system pipeline respectively and carries out coal-bed gas and take out in advance.
In addition, described step can also preset gathering sill in 3. in pressure break boring.
Described gathering sill is to have the coal seam of width or what have width is the circular slot or the branch hole of round dot with the gathering sill center.
The quantity of described gathering sill is at least one.
Coal seam presplit blasting and fracturing join does the reinforcement extraction that anti-reflection method can be applied to suitable layer boring, also can be applied to the reinforcement extraction of layer-through drilling.
The invention has the beneficial effects as follows: the inventive method is because the pressure break boring of outside the shot hole influence basin, constructing after adopting presplit blasting; Adopting hydraulic fracturing technology that coal body between pressure break boring and the shot hole is pressed wears; Destroy shot hole fine and close duricrust on every side; Make to form more crack between the boring, and carry out a large amount of ickings through water under high pressure.Under the prerequisite of minimizing measure boring 20% ~ 50%, increase the release scope of coal body, gas permeability of coal seam improves 20 ~ 100 times; The gas pumping effect improves more than 20%; Reduce blasting boreholes and measure boring effectively, reduce and find time in advance more than 1/3, reduce the gas disaster to greatest extent.
Description of drawings
Below in conjunction with accompanying drawing and specific embodiment the present invention is further specified.
Fig. 1 is the construction schematic diagram along layer boring first embodiment of the present invention;
Fig. 2 is the construction schematic diagram along layer boring second embodiment of the present invention;
Fig. 3 is the construction schematic diagram along layer boring the 3rd embodiment of the present invention;
Fig. 4 is the construction schematic diagram of layer-through drilling the 4th embodiment of the present invention.
Among the figure: 1. high-pressure hydraulic pumping plant, 2. stop valve, 3. high-pressure rubber pipe, 4. explosive, 5. sealing material, 6. presplit blasting influence basin, 7. gathering sill, 8. pressure break boring, 9. blasting boreholes, 10 coal seams.
The specific embodiment:
With reference to the accompanying drawings and combine the instance specific embodiments of the invention to do further detailed description:
Embodiment one:
Referring to Fig. 1, construction blasting boring 9 in the coal seam, the explosive 4 of in blasting boreholes 9, packing into then is also with sealing material 5 sealing of holes, and line is blown out and is carried out presplit blasting then.After confirming the explosion success after the presplit blasting; Hole 8 in blasting boreholes 9 both sides greater than 2 ~ 3 times of distances of explosion influence basin or 10 ~ 15m place construction pressure break; Pressure break 8 degree of depth of holing are approximately blasting boreholes 9 degree of depth and explosion influence basin sum, adopt hole packer or cement mortar sealing of hole, open 1 pair of pressure break boring 8 of high-pressure hydraulic pumping plant and carry out fracturing; Coal body between pressure break boring 8 and blasting boreholes 9 is pressed and is worn; Destroy shot hole fine and close duricrust on every side, make to form more crack between the boring, and carry out a large amount of ickings through water under high pressure.After pressure break finished, pressure break boring 8 inserted the extraction system with blasting boreholes 9 equal sealing of holes and begins extraction.
Wherein, sequence of construction is construction blasting hole 9 at first, implements presplit blasting then, and the pressure break of constructing again boring 8 and sealing of hole are implemented fracturing then, and the coal body pressure is worn between will hole.
Wherein, presplit blasting can be common presplit blasting, control presplit blasting, also can be deep hole presplit blasting, perhaps other forms of presplit blasting.
Wherein: the pressure break boring 8 in the coal body can be one, also can be several.
Wherein, blasting boreholes 9 and pressure break boring 8 are connected to mine gas extraction system through the extraction system pipeline respectively and carry out coal-bed gas and take out in advance.
Embodiment two:
Referring to Fig. 2, in the coal seam construction blasting boring 9 several, blasting boreholes 9 spacings are 4 ~ 6 times of distances of explosion influence basin or 20 ~ 30m, the explosive 4 and of in blasting boreholes 9, packing into then with sealing material 5 sealing of holes, line is blown out and is carried out presplit blasting then.After confirming the explosion success after the presplit blasting, in blasting boreholes midway construction pressure break boring 8, pressure break 8 degree of depth of holing are approximately blasting boreholes 9 degree of depth and explosion influence basin sum; Adopt hole packer or cement mortar sealing of hole; Open 1 pair of pressure break boring 8 of high-pressure hydraulic pumping plant and carry out fracturing, the coal body between pressure break boring 8 and blasting boreholes 9 is pressed and is worn, the fine and close duricrust around the destruction shot hole; Make to form more crack between the boring, and carry out a large amount of ickings through water under high pressure.After pressure break finished, pressure break boring 8 inserted the extraction system with blasting boreholes 9 equal sealing of holes and begins extraction.
Wherein, sequence of construction is construction blasting hole 9 at first, implements presplit blasting then, and the pressure break of constructing again boring 8 and sealing of hole are implemented fracturing then, and the coal body pressure is worn between will hole.
Wherein, presplit blasting can be common presplit blasting, control presplit blasting, also can be deep hole presplit blasting, perhaps other forms of presplit blasting.
Wherein: the blasting boreholes 8 in the coal body can be one, also can be several.
Wherein, blasting boreholes 9 and pressure break boring 8 are connected to mine gas extraction system through the extraction system pipeline respectively and carry out coal-bed gas and take out in advance.
Embodiment three:
Referring to Fig. 3, in the coal seam construction blasting boring 9 several, the blasting boreholes spacing is 4 ~ 6 times of distances of explosion influence basin or 20 ~ 30m, the explosive 4 and of in blasting boreholes 9, packing into then with sealing material 5 sealing of holes, line is blown out and is carried out presplit blasting then.After confirming the explosion success after the presplit blasting; In blasting boreholes midway construction pressure break boring 8, pressure break 8 degree of depth of holing are approximately blasting boreholes 9 degree of depth and explosion influence basin sum, hole in pressure break and preset gathering sill 7 in 8; Adopt hole packer or cement mortar sealing of hole then; Open 1 pair of pressure break boring 8 of high-pressure hydraulic pumping plant and carry out fracturing, the coal body between pressure break boring 8 and blasting boreholes 9 is pressed and is worn, the fine and close duricrust around the destruction shot hole; Make to form more crack between the boring, and carry out a large amount of ickings through water under high pressure.After pressure break finished, pressure break boring 8 inserted the extraction system with blasting boreholes 9 equal sealing of holes and begins extraction.
Wherein, sequence of construction is construction blasting hole 9 at first, implements presplit blasting then, and the pressure break of constructing again boring 8 and sealing of hole are implemented fracturing then, and the coal body pressure is worn between will hole.
Wherein, presplit blasting can be common presplit blasting, control presplit blasting, also can be deep hole presplit blasting, perhaps other forms of presplit blasting.
Wherein: the blasting boreholes 8 in the coal body can be one, also can be several.
Wherein: in coal body, being pre-formed gathering sill 7, can be through the jet-flow deep penetrating technology, also can be through hydraulic slotted liner technique, waterpower counter-boring techniques, can also be that perhaps other can form the technology of gathering sill 7 through the branch hole technology.
Wherein: preformed gathering sill 7 in coal body can be the coal seam of certain width, also can be certain width be the circular slot of round dot with the gathering sill center, or branch hole.
Wherein: the gathering sill 7 in the coal body can be one, also can be several
Wherein, blasting boreholes 9 and pressure break boring 8 are connected to mine gas extraction system through the extraction system pipeline respectively and carry out coal-bed gas and take out in advance.
Embodiment four:
Referring to Fig. 4, hole 9 with rig from the tunnel to the coal seam construction blasting, pack explosive 4 into also with sealing material 5 sealing of holes at blasting boreholes 9 coal seam Duan Chu then, line is blown out and is carried out presplit blasting then.After confirming the explosion success after the presplit blasting; Greater than 2 ~ 3 times of distances of explosion influence basin or 10 ~ 15m place construction pressure break boring 8, pressure break 8 degree of depth of holing are approximately blasting boreholes 9 degree of depth and explosion influence basin sum in blasting boreholes 9 both sides, preset gathering sill 7 at the pressure break coal seam Duan Chu that holes; Adopt hole packer or cement mortar sealing of hole; Open 1 pair of pressure break boring 8 of high-pressure hydraulic pumping plant and carry out fracturing, the coal body between pressure break boring 8 and blasting boreholes 9 is pressed and is worn, the fine and close duricrust around the destruction shot hole; Make to form more crack between the boring, and carry out a large amount of ickings through water under high pressure.After pressure break finished, pressure break boring 8 inserted the extraction system with blasting boreholes 9 equal sealing of holes and begins extraction.
Wherein, sequence of construction is construction blasting hole 9 at first, implements presplit blasting then, and the pressure break of constructing again boring 8 and sealing of hole are implemented fracturing then, and the coal body pressure is worn between will hole.
Wherein, presplit blasting can be common presplit blasting, control presplit blasting, also can be deep hole presplit blasting, perhaps other forms of presplit blasting.
Wherein: the blasting boreholes 8 in the coal body can be one, also can be several.
Wherein: in coal body, being pre-formed gathering sill 7, can be through the jet-flow deep penetrating technology, also can be through hydraulic slotted liner technique, waterpower counter-boring techniques, can also be that perhaps other can form the technology of gathering sill 7 through the branch hole technology.
Wherein: preformed gathering sill 7 in coal body can be the coal seam of certain width, also can be certain width be the circular slot of round dot with the gathering sill center, or branch hole.
Wherein: the gathering sill 7 in the coal body can be one, also can be several.
Wherein, blasting boreholes 9 and pressure break boring 8 are connected to mine gas extraction system through the extraction system pipeline respectively and carry out coal-bed gas and take out in advance.
Although preceding text specify the present invention, the invention is not restricted to this, those skilled in the art of the present technique can carry out various modifications according to principle of the present invention.Therefore, all modifications of doing according to the principle of the invention all are to be understood that to falling into protection scope of the present invention.
Claims (8)
1. coal seam presplit blasting and fracturing couplet is made anti-reflection method, it is characterized in that including following steps:
1. construction blasting hole in coal body; 2. implement presplit blasting; 3. the pressure break of outside the shot hole influence basin, constructing boring and sealing of hole; 4. adopt hydraulic fracturing technology that coal body between pressure break boring and the shot hole is pressed and wear, destroy shot hole fine and close duricrust on every side, make to form more crack between the boring, and carry out ickings through water under high pressure.
2. coal seam according to claim 1 presplit blasting and fracturing join makes anti-reflection method, and it is characterized in that: 3. described step also comprises: in pressure break boring, preset gathering sill.
3. coal seam according to claim 2 presplit blasting and fracturing join makes anti-reflection method, it is characterized in that: described gathering sill is to have the coal seam of width or what have width is the circular slot or the branch hole of round dot with the gathering sill center.
4. coal seam according to claim 3 presplit blasting and fracturing join makes anti-reflection method, and it is characterized in that: the quantity of described gathering sill is at least one.
5. coal seam according to claim 1 and 2 presplit blasting and fracturing join makes anti-reflection method, it is characterized in that: described presplit blasting is a kind of in common presplit blasting, control presplit blasting, the deep hole presplit blasting.
6. coal seam according to claim 1 and 2 presplit blasting and fracturing join makes anti-reflection method, and it is characterized in that: the quantity of the shot hole in the described coal body is at least one.
7. coal seam according to claim 1 and 2 presplit blasting and fracturing join makes anti-reflection method, it is characterized in that: described pressure break boring is common boring or the boring of the gathering sill with orientation.
8. coal seam according to claim 1 and 2 presplit blasting and fracturing join makes anti-reflection method, it is characterized in that: described shot hole and pressure break are holed respectively and to be connected to mine gas extraction system through the extraction system pipeline and to carry out coal-bed gas and take out in advance.
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| CN102966372A (en) * | 2012-12-17 | 2013-03-13 | 中国矿业大学 | Slotting induced-flow pressure-relief anti-reflection method for complicated seam |
| CN103953285A (en) * | 2014-04-10 | 2014-07-30 | 河南理工大学 | Bedding hydraulic punching method |
| CN104314606A (en) * | 2014-08-15 | 2015-01-28 | 中国矿业大学 | Hydraulic cutting and gas explosion combined enhancing extraction method for fracturing coal body in drill hole |
| CN104453898A (en) * | 2014-10-23 | 2015-03-25 | 山东科技大学 | Deep hole blasting and static water injecting combining coal seam weakening method |
| CN104564125A (en) * | 2014-12-02 | 2015-04-29 | 河南理工大学 | Soft coal reservoir gas enhanced extraction contrast experiment device and experiment method |
| CN105370256A (en) * | 2015-10-15 | 2016-03-02 | 山东科技大学 | Method for increasing wetting radius of high-pressure water injection of low-air-permeability coal seams through sectioned pre-splitting |
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| CN103953285A (en) * | 2014-04-10 | 2014-07-30 | 河南理工大学 | Bedding hydraulic punching method |
| CN103953285B (en) * | 2014-04-10 | 2016-08-17 | 河南理工大学 | Concordant hydraulic flushing in hole method |
| CN104314606B (en) * | 2014-08-15 | 2016-01-13 | 中国矿业大学 | Hydraulic slotted liner technique and the combined reinforced pumping method of gas explosion fracturing coal body in a kind of boring |
| CN104314606A (en) * | 2014-08-15 | 2015-01-28 | 中国矿业大学 | Hydraulic cutting and gas explosion combined enhancing extraction method for fracturing coal body in drill hole |
| CN104453898A (en) * | 2014-10-23 | 2015-03-25 | 山东科技大学 | Deep hole blasting and static water injecting combining coal seam weakening method |
| CN104564125B (en) * | 2014-12-02 | 2016-06-22 | 河南理工大学 | Cherry coal reservoir gas enhanced gas extraction contrast experiment's device and experimental technique |
| CN104564125A (en) * | 2014-12-02 | 2015-04-29 | 河南理工大学 | Soft coal reservoir gas enhanced extraction contrast experiment device and experiment method |
| CN105370256A (en) * | 2015-10-15 | 2016-03-02 | 山东科技大学 | Method for increasing wetting radius of high-pressure water injection of low-air-permeability coal seams through sectioned pre-splitting |
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| CN111287721A (en) * | 2020-03-04 | 2020-06-16 | 中联煤层气有限责任公司 | Fracturing method combining high-pressure aerodynamic force induced fracture initiation and hydraulic fracturing |
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| CN113431497B (en) * | 2021-07-16 | 2023-12-22 | 辽宁工程技术大学 | Main drilling-supporting hole flexible steel pipe jet integrated mining drilling tool |
| CN113622915A (en) * | 2021-09-27 | 2021-11-09 | 中国矿业大学 | Method for rapid recovery of invaded hard rock mass of advanced pretreatment coal face |
| CN114810197A (en) * | 2022-05-19 | 2022-07-29 | 贵州一和科技有限公司 | Gas permeability increasing method for coal roadway driving face dynamic and static combined action |
| CN114810197B (en) * | 2022-05-19 | 2022-10-25 | 贵州一和科技有限公司 | Gas permeability increasing method for coal roadway driving face dynamic and static combined action |
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Application publication date: 20120815 |