CN101614133B - High pressure jet drilling and slotting integration pressure-release anti-burst method - Google Patents
High pressure jet drilling and slotting integration pressure-release anti-burst method Download PDFInfo
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- CN101614133B CN101614133B CN2009101821194A CN200910182119A CN101614133B CN 101614133 B CN101614133 B CN 101614133B CN 2009101821194 A CN2009101821194 A CN 2009101821194A CN 200910182119 A CN200910182119 A CN 200910182119A CN 101614133 B CN101614133 B CN 101614133B
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- 238000005553 drilling Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000010354 integration Effects 0.000 title claims abstract description 12
- 239000003245 coal Substances 0.000 claims abstract description 60
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 3
- 230000035699 permeability Effects 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 5
- 239000011241 protective layer Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000005422 blasting Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The invention relates to a high pressure jet drilling and slotting integration pressure-release anti-burst method, which combines a high pressure jet method and a drilling construction method to realize the integration of drilling and slotting. When a press control drill scalpel drilling bit drills to a preset position of a coal seam, applies high pressure jet with the pressure between 25 and 35MPa and the flow rate between 40 and 80L/min in a bore hole to cut the coal body on two sides of the bore hole; in the slotting process, the coal flow rate is between 4 and 8kg/min, and a flat slot with the radius between 400 and 700mm and the seam width of 25mm is formed on the two sides of the bore hole; and the high pressure jet carries the cut coal body out of the bore hole. By the method, the coal body exposure area is increased, the flat slot is equivalent to a thin protective layer exploited in a local range, the coal body near the bore hole achieves pressure release, and the air permeability of the coal body is improved by 200 to 300 times so as to create good conditions for pressure release and gas release and flow inside the coal seam. The method has the advantages of having wide pressure release range and fully integral pressure release of the coal seam, improving the capacity of coal seam gas drainage, and having effective anti-burst function and comprehensive practicability.
Description
Technical field
The present invention relates to high pressure jet drilling and slotting integration pressure-release anti-burst method, be particularly useful for the projecting coal bed regional pressure-relief outburst-prevention of the high gas low-permeable in colliery.
Background technology
Coal and gas are outstanding to be serious natural calamity one in the process of coal mining, and along with the increase of mining depth, coal-bed gas pressure and content increase, ature of coal is soft, and gas permeability of coal seam is low, and gas outburst risk further strengthens, outstanding number of times day by day increases, and the disaster that causes is also serious day by day.In order to eliminate the projecting coal bed outburst hazard of high gas low-permeable, China has carried out the investigative test research of multiple anti-burst method to high gas low-permeable outburst danger coal seam since the seventies in 20th century.
The projecting coal bed work plane extinction of present high gas low-permeable method and measure mainly contains: exploitation topping, regional gas are taken out in advance, advance borehole, longhole infusion, hydraulic flushing in hole, deep hole loosening blasting and Deep-hole Controlled Blasting etc.Certain effect has more or less all been played in various measures in the part, it is abundant inadequately that these anti-burst method ubiquities whole release, and occurring implementation method aftereffect inspection index easily transfinites problems such as working procedure complexity.
Summary of the invention
Technical problem: it is simple to the purpose of this invention is to provide a kind of method, time saving and energy saving, the effective high pressure jet drilling and slotting integration pressure-release anti-burst method of release.
Technical scheme: high pressure jet drilling and slotting integration pressure-release anti-burst method of the present invention:
(1) the through hole drilling rod that will have a high pressure sealing with rig to the coal seam along layer or layer-through drilling to desired location;
(2) start rig and move back the brill operation, start the high pressure pumping plant simultaneously, by the high pressure sealing through hole drilling rod in holing the high-pressure spray of certain pressure and flow is carried out the limit to the coal body of boring both sides and move back and bore the limit cutting, make the boring both sides form the flat slot of certain width and height;
(3) the coal seam section is carried out slot; Under the layer-through drilling situation, coal seam section total length is carried out slot; The coal seam along layer boring, is stopped the slot operation at distance drilling orifice 5～10m place, directly withdraw from drilling rod;
(4) continue the creeping into of next boring, slot operation.
Described certain pressure is 25～30MPa, and flow is 40～80L/min; The described flat slot radius that forms in the boring both sides is the wide 25mm of being of 400～700mm, seam.
Beneficial effect: the present invention combines high-pressure spray with drilling construction, and realization is crept into slot integrated, can solve the gas outstanding problem in the projecting coal bed recovery process of high gas low-permeable safely and effectively.Rig is after carrying out the hydraulic slotted liner technique measure, at first increased the coal body exposed area, be equivalent to exploit in the subrange one deck topping as thin as a wafer, reach a layer interior self-emancipation, give the inner release in coal seam, gas release and flow and created good condition, consequently cause the slot fully release of the certain limit of coal body up and down, increased the permeability in coal seam; Secondly, slot that slot forms in coal body or space make slot coal body on every side move to the slot space, thereby have more enlarged slot release, gas-removing scope under the effect of geostatic stress.Because cutting, the percussion of hydraulic slotted liner technique, a part of coal body is shot down by water under high pressure and washes away around the boring, form flat slot space, this slot can make on every side that coal body is subjected to displacement and exapnsion, has increased the crack in the coal body, has improved the Gas Flow state in the coal seam greatly, the virgin stress and the crack situation of coal body have been changed, stress tense situation in coal body and the country rock is to a certain degree relaxed, and reaches a large amount of releases of outstanding potential, makes the coal petrography hardening.Like this, both weakened or eliminated outstanding power, and changed projecting coal bed physical and mechanical properties again greatly, so high pressure jet drilling and slotting integration pressure-release anti-burst method can play and prevents the useful effect given prominence to.By the projecting coal bed boring of high gas low-permeable, the disposable of slot are finished, improved the gas permeability in coal seam, give the inner release in coal seam, gas release and flow and created good condition.This method has increased the coal body exposed area; and flat slot has been equivalent to exploit in the subrange one deck topping as thin as a wafer; coal body has obtained release near the boring; the coal body gas permeability has improved 200～300 times; give the inner release in coal seam, gas release and flow and created good condition; big, the whole release of this method coal seam release scope is abundant; improve the ability of extraction coal-bed gas; play and prevent the useful effect given prominence to; this method is easy to operate, operation is simple; save the working time greatly, alleviated workman's workload, had practicality widely.
The specific embodiment
High pressure jet drilling and slotting integration pressure-release anti-burst method of the present invention: adopt high-pressure spray to combine with drilling construction, realization is crept into slot integrated, and the gas that solves in the projecting coal bed recovery process of high gas low-permeable is outstanding.At first use rig to suitable layer in coal seam or layer-through drilling to the coal seam in the projecting coal bed zone of high gas low-permeable, low-pressure water, drilling construction and common drilling construction basically identical are adopted in boring.Low-pressure water is delivered to the positive nozzle ejaculation that voltage-controlled brill cuts the drill bit position through rig, drilling rod, finish jointly with rig and to creep into operation, after creeping into end, rig stops operating, only move back the brill operation, after high service system hydraulic pressure reaches scheduled pressure value 25～35MPa, as required, water under high pressure can be mixed mutually with the abrasive particle that the abrasive material loading system produces, form liquid-solid two-phase fluid.The drilling rod of boring is the special through hole drilling rod with high pressure sealing, and this drilling rod can bear the high-pressure spray of 20～30MPa and not reveal, and is drilled into desired location, and desired location is determined the degree of depth, inclination angle, the elevation angle of boring according to geologic parameter.When voltage-controlled brill cuts after bit drills enters the coal seam desired location, stop to creep into, control voltage-controlled brill and cut the switching of the low-pressure water of drill bit to water under high pressure this moment, start rig then and move back the brill operation, start the high pressure pumping plant simultaneously, utilization pressure is that 25～35MPa, flow are that the high-pressure spray of 40～80L/min cuts the coal body of the both sides of holing in boring, coal flow in the slot process is at 4～8kg/min, form the flat slot of radius a 400～700mm, the wide 25mm of seam in the boring both sides, in moving back the process of brill, implement to finish the operation of high-pressure spray slot.Under the layer-through drilling situation, coal seam section total length is carried out slot.At holing of high gas low air permeability coal seam along layer, in order to guarantee job safety and to help the aperture is sealed extraction, need leave certain leading distance, can stop the slot operation at 5～10m place, distance aperture as required, directly withdraw from drilling rod.Repeat said process, continue the creeping into of next boring, slot operation.
Claims (3)
1. high pressure jet drilling and slotting integration pressure-release anti-burst method is characterized in that:
(1) the through hole drilling rod that will have a high pressure sealing with rig to the coal seam along layer or layer-through drilling to desired location;
(2) start rig and move back the brill operation, start the high pressure pumping plant simultaneously, by the high pressure sealing through hole drilling rod in holing the high-pressure spray of certain pressure and flow is carried out the limit to the coal body of boring both sides and move back and bore the limit cutting, make the boring both sides form the flat slot of certain width and height;
(3) the coal seam section is carried out slot; Under the layer-through drilling situation, coal seam section total length is carried out slot; The coal seam along layer boring, is stopped the slot operation at distance drilling orifice 5～10m place, directly withdraw from drilling rod;
(4) continue the creeping into of next boring, slot operation.
2. high pressure jet drilling and slotting integration pressure-release anti-burst method according to claim 1 is characterized in that: described certain pressure is 25～30MPa, and flow is 40～80L/min.
3. high pressure jet drilling and slotting integration pressure-release anti-burst method according to claim 1 is characterized in that: the described flat slot radius that forms in the boring both sides is the wide 25mm of being of 400～700mm, seam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009101821194A CN101614133B (en) | 2009-07-14 | 2009-07-14 | High pressure jet drilling and slotting integration pressure-release anti-burst method |
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| CN2009101821194A CN101614133B (en) | 2009-07-14 | 2009-07-14 | High pressure jet drilling and slotting integration pressure-release anti-burst method |
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| CN101614133A CN101614133A (en) | 2009-12-30 |
| CN101614133B true CN101614133B (en) | 2011-07-06 |
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| CN2009101821194A Expired - Fee Related CN101614133B (en) | 2009-07-14 | 2009-07-14 | High pressure jet drilling and slotting integration pressure-release anti-burst method |
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- 2009-07-14 CN CN2009101821194A patent/CN101614133B/en not_active Expired - Fee Related
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