CN103696800A - Drilling, cutting, pressing and pumping method - Google Patents
Drilling, cutting, pressing and pumping method Download PDFInfo
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Abstract
The invention provides a drilling, cutting, pressing and pumping method which is suitable for gas extraction of coal seams which are high in gas and low in gas permeability. The drilling, cutting, pressing and pumping method comprises punching a drill hole according to the design requirements through a drilling machine; replacing a hydraulic seam cutting drill bit after a drill rod is withdrawn, continuing to drill to the bottom of the drill hole and withdrawing the drill rod to perform hydraulic seam cutting; sealing the drill hole and performing gas drainage after the hydraulic seam cutting is achieved; switching a drainage pipeline into a pulse water injection pump station when the gas drainage capacity is in the attenuation trend and fracturing the coal seams in a pulse hydraulic fracturing mode. According to the drilling, cutting, pressing and pumping method, the effective influence range of a single hole of gas extraction drilling of the coal seams can be increased by more than 30%, the gas flow of the single hole can be improved by more than 30%, the gas extraction rate can be improved by more than 20%, the operation is simple, the influence range of drilling pressure relief can be improved, and the concentration and the efficiency of the gas extraction of the drilling can be improved.
Description
Technical field
The present invention relates to a kind of brill and cut to press and take out method, be specially adapted to the gas drainage under suction of high gassy and low permeability coal seam under coal mine.
Background technology
China Mine Geological complicated condition, high gas layer accounts for 50～70%, and high gassy and low permeability coal seam accounts for 70% left and right wherein.A large amount of Gas are often followed in the exploitation of high gassy and low permeability coal seam, particularly along with the high-efficiency intensifying of coal production and the increase of mining depth, gas emission is increasing, the threat of gas explosion and Gas Outburst danger is also increasing, and Gas Disaster has become the greatest factor of the intensive production technique development of restriction colleges and universities and safety in production.Therefore, how to solve the Gas problem in high gas layer recovery process, Safety of Coal Mine Production tool is of great significance.
The major measure that solves the Gas problem in high gassy and low permeability coal seam recovery process is gas pumping.By gas pumping, not only can effectively reduce the Gas in seam mining process, guarantee the safety of coal production; Meanwhile, extraction high concentration gas out can be used, and realizes dual intensity exploitation.But high gassy and low permeability coal seam gas permeability is poor, conventional extraction difficulty is large, weak effect, need to take the anti-reflection technical measures of pressure release.Conventional gas drainage method is difficult to play a role, and the main problem existing is: effective influence basin of holing is little, and work plane drilling construction workload is large, and drainage efficient is low.
Summary of the invention
Technical problem: the object of the invention is to overcome the weak point in prior art, provide a kind of method simple, improve boring pressure release influence basin, improve the gas extraction concentration of boring and the brill of gas pumping efficiency cuts the method for taking out of pressing.
Technical scheme: brill of the present invention cuts to press takes out method, comprises the steps:
A, utilize rig to mining or the coal seam in driving face the place ahead is made a call to one and holed to projected depth;
B, exit drilling rod, change hydraulic slotted liner technique drill bit and continue to creep into, until arrive foot of hole, retreat drilling rod interval and carry out hydraulic slotted liner technique, in boring, form the main crack of a plurality of annulars; The time that hydraulic slotted liner technique is carried out at described interval is 20min;
After c, hydraulic slotted liner technique finish, the Y-shaped three-way pipe that front portion is banded with to polyurethane sealing pore area is sent in boring, again return pipe and Grouting Pipe are veered away in boring, at Y-shaped three-way pipe, Grouting Pipe and return pipe, enter boring section colligation polyurethane sealing pore area simultaneously, drilling orifice is blocked, releasing pipe ball valve and pressure break pipe ball valve are set respectively on the entrance pipeline section of Y-shaped three-way pipe, and the length of described drilling orifice sealing of hole section is 25～40% of boring length;
D, connection gas drainage under suction pipe network, open the releasing pipe ball valve on Y-shaped three-way pipe, utilizes negative pressure that gas is extracted out, and drilling orifice negative pressure is not less than 20KPa;
E, when pressure meter shows that gas drainage amount is attenuation trend, close the releasing pipe ball valve on Y-shaped three-way pipe, open the pressure break pipe ball valve on Y-shaped three-way pipe, extraction pipeline is switched to pulsed infusion pumping plant, by pulsation water, fracturing is carried out in coal seam, fracturing crack is expanded along the formed main crack of hydraulic slotted liner technique, forms secondary interstice; After pressure break finishes, close pressure break ball valve, pipeline is connected to extraction pipe network, then opens releasing pipe ball valve, utilize negative pressure to continue gas from the interior extraction of holing.
Described Y-shaped three-way pipe comprises with main body tube the releasing pipe on same straight line, the pressure break pipe that is communicated with main body tube and parallels with releasing pipe through a bending tube section, releasing pipe and pressure break pipe equal diameter, centre distance between releasing pipe and pressure break pipe is caliber 1.5～3 times, the end sealing of releasing pipe and pressure break pipe, has presbyopia on the tube wall apart from end sealing section 1～3m.
Beneficial effect, owing to having adopted such scheme, the present invention can make the effective influence basin of coal bed gas extraction boring single hole improve more than 30%, improve single hole gas flow more than 30%, improve gas pumping rate more than 20%, the quick extraction of work plane the place ahead gas can be realized, and then the propelling safely and fast of work plane can be realized.Major advantage has:
(1) the main crack that hydraulic slotted liner technique forms can become the guiding crack of later stage fracturing, is conducive to the formation in crack;
(2) synergy of hydraulic slotted liner technique and fracturing, realizes " the secondary volume increase " of gas, improves gas flow and concentration.Can realize the quick extraction of work plane the place ahead gas, meanwhile, work plane the place ahead stress also can be reduced, and forms effective pressure release space, thereby realizes the quick propelling of work plane;
(3) the present invention is simple to operate, has improved gas drainage efficiency, realizes the safe extraction of gas, increases economic efficiency.
Accompanying drawing explanation
Fig. 1 is structure chart of the present invention.
Fig. 2 is the structure chart of Y-shaped three-way pipe.
In figure: 1, Y-shaped three-way pipe; 1-1, releasing pipe; 1-2, pressure break pipe; 1-3, releasing pipe ball valve; 1-4, pressure break pipe ball valve; 2, coal seam; 3, return pipe; 4, front and back polyurethane sealing of hole section; 5, main crack; 6, secondary interstice; 7, boring; 8, slip casting section; 9, Grouting Pipe.
The specific embodiment
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
Brill of the present invention cuts to press takes out method, and concrete steps are as follows:
A, first utilize rig to mining or a boring 7 is played to projected depth in the coal seam 2 in driving face the place ahead;
B, exit drilling rod, change hydraulic slotted liner technique drill bit and continue to creep into, until arrive foot of hole, retreat drilling rod interval and carry out hydraulic slotted liner technique, in boring, form the main crack 5 of a plurality of annulars; The time that hydraulic slotted liner technique is carried out at described interval is 20min; By slot, coal body is carried out artificial perturbation, forms the anti-reflection space of release, improve gas permeability of coal seam;
C, after hydraulic slotted liner technique finishes, to holing, 7 apertures are blocked, sealing of hole segment length is 25～40% of boring length, the Y-shaped three-way pipe 1 that first front portion is banded with to polyurethane sealing pore area is sent in boring 7, again return pipe 3 and Grouting Pipe 9 are veered away in boring 7, simultaneously at Y-shaped three-way pipe 1, Grouting Pipe 9 and return pipe 3 enter boring section colligation polyurethane sealing pore area, releasing pipe ball valve 1-3 and pressure break pipe ball valve 1-4 are set respectively on the entrance pipeline section of Y-shaped three-way pipe, and putting in mouthful section of Grouting Pipe 9 and return pipe 3, switch valve is set, utilizing grouting pump to connect Grouting Pipe 9 injects cement grout in the boring 8 of front and back polyurethane sealing of hole section 4 shutoff, while waiing upon the interior outflow slurries of return pipe 3, close the valve on return pipe 3, continue to close grouting pump after slip casting 1～2min, shutoff before and after completing in the 4 shutoff borings of polyurethane sealing of hole section,
Described Y-shaped three-way pipe comprises with main body tube the releasing pipe 1-1 on same straight line, the pressure break pipe 1-2 that is communicated with main body tube and parallels with releasing pipe through a bending tube section, releasing pipe 1-1 and pressure break pipe 1-2 equal diameter, centre distance between releasing pipe 1-1 and pressure break pipe 1-2 is caliber 1.5～3 times, the end sealing of releasing pipe 1-1 and pressure break pipe 1-2, has presbyopia on the tube wall apart from end sealing section 1～3m;
D, connection gas drainage under suction pipe network, open the releasing pipe ball valve 1-3 on Y-shaped three-way pipe 1, utilizes negative pressure that gas is extracted out, and drilling orifice negative pressure is not less than 20KPa;
E, when pressure meter shows that gas drainage amount is attenuation trend, close the releasing pipe ball valve on Y-shaped three-way pipe, open the pressure break pipe ball valve on Y-shaped three-way pipe, extraction pipeline is switched to pulsed infusion pumping plant, by pulsation water, fracturing is carried out in coal seam, fracturing crack is expanded along the formed main crack of hydraulic slotted liner technique, forms secondary interstice 6; After pressure break finishes, close pressure break ball valve 1-4, pipeline is connected to extraction pipe network, then opens releasing pipe ball valve 1-3, utilize negative pressure to continue gas from the 7 interior extractions of holing.Thereby realize " the secondary volume increase " of gas, improved gas flow and concentration.
Claims (2)
1. brill cuts to press and takes out a method, it is characterized in that, comprises the steps:
A, utilize rig to mining or the coal seam in driving face the place ahead is made a call to one and holed to projected depth;
B, exit drilling rod, change hydraulic slotted liner technique drill bit and continue to creep into, until arrive foot of hole, retreat drilling rod interval and carry out hydraulic slotted liner technique, in boring, form the main crack of a plurality of annulars; The time that hydraulic slotted liner technique is carried out at described interval is 20min;
After c, hydraulic slotted liner technique finish, the Y-shaped three-way pipe that front portion is banded with to polyurethane sealing pore area is sent in boring, again return pipe and Grouting Pipe are veered away in boring, at Y-shaped three-way pipe, Grouting Pipe and return pipe, enter boring section colligation polyurethane sealing pore area simultaneously, drilling orifice is blocked, releasing pipe ball valve and pressure break pipe ball valve are set respectively on the entrance pipeline section of Y-shaped three-way pipe, and the length of described drilling orifice sealing of hole section is 25～40% of boring length;
D, connection gas drainage under suction pipe network, open the releasing pipe ball valve on Y-shaped three-way pipe, utilizes negative pressure that gas is extracted out, and drilling orifice negative pressure is not less than 20KPa;
E, when pressure meter shows that gas drainage amount is attenuation trend, close the releasing pipe ball valve on Y-shaped three-way pipe, open the pressure break pipe ball valve on Y-shaped three-way pipe, extraction pipeline is switched to pulsed infusion pumping plant, by pulsation water, fracturing is carried out in coal seam, fracturing crack is expanded along the formed main crack of hydraulic slotted liner technique, forms secondary interstice; After pressure break finishes, close pressure break ball valve, pipeline is connected to extraction pipe network, then opens releasing pipe ball valve, utilize negative pressure to continue gas from the interior extraction of holing.
2. a kind of brill according to claim 1 cuts the method for taking out of pressing, it is characterized in that: described Y-shaped three-way pipe comprises with main body tube the releasing pipe on same straight line, the pressure break pipe that is communicated with main body tube and parallels with releasing pipe through a bending tube section, releasing pipe and pressure break pipe equal diameter, centre distance between releasing pipe and pressure break pipe is caliber 1.5～3 times, the end sealing of releasing pipe and pressure break pipe, has presbyopia on the tube wall apart from end sealing section 1～3m.
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103883303A (en) * | 2014-04-23 | 2014-06-25 | 重庆市能源投资集团科技有限责任公司 | Orientation jetting and fracturing exploitation method for coal bed gas under coal mine |
| CN104131832A (en) * | 2014-07-14 | 2014-11-05 | 中国矿业大学 | High-gas-content coal seam punching cutting pressing and sucking integral pressure relief and antireflection gas extraction 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 |
| CN104314605A (en) * | 2014-08-15 | 2015-01-28 | 中国矿业大学 | Enhanced extraction method for fracturing coal body by multistage gas explosion in drill hole |
| CN104481575A (en) * | 2014-11-06 | 2015-04-01 | 中国矿业大学 | Hot steam displacement gas method for improving gas extraction efficiency |
| CN104481452A (en) * | 2014-12-05 | 2015-04-01 | 中国矿业大学 | Method for sealing holes drilled through variable-frequency impulse grouting drilling |
| CN104653161A (en) * | 2015-02-12 | 2015-05-27 | 中国矿业大学(北京) | Coal mine underground pulse hydraulic slot cutting-fracturing integral anti-reflection extraction device and method |
| CN104763462A (en) * | 2015-04-07 | 2015-07-08 | 中国矿业大学 | Method for extracting high-pressure hydraulic cave-manufacturing gas from rock roadway crossing hole |
| CN105422043A (en) * | 2015-12-15 | 2016-03-23 | 中国矿业大学 | Underground coal mine coal seam water injection and hydraulic fracturing drilled hole sealing method |
| CN105484720A (en) * | 2015-12-29 | 2016-04-13 | 中国矿业大学 | Microwave-assisted extraction and hydrofracture cooperative coal seam anti-reflection method |
| CN105525901A (en) * | 2015-12-29 | 2016-04-27 | 中国矿业大学 | Coal seam hydrofracture strengthening permeability increasing method based on microwave irradiation |
| WO2016110183A1 (en) * | 2015-01-06 | 2016-07-14 | 中国矿业大学 | Method for integrated drilling, flushing, slotting and thermal injection for coalbed gas extraction |
| CN106609677A (en) * | 2015-10-22 | 2017-05-03 | 中铁二局集团有限公司 | A gas extraction and discharge construction method |
| CN109162704A (en) * | 2018-10-16 | 2019-01-08 | 中国矿业大学(北京) | The pre- attenuating drilling negative pressure attenuation test device of a kind of coal-bed gas |
| CN110219615A (en) * | 2019-05-31 | 2019-09-10 | 山东科技大学 | A kind of coal seam pulsed infusion borehole sealing device and method for sealing |
| CN111101917A (en) * | 2019-12-20 | 2020-05-05 | 神华新疆能源有限责任公司 | Coal seam hydraulic fracturing combined resonance gas extraction method and hole packer |
| CN113431530A (en) * | 2021-06-29 | 2021-09-24 | 安徽理工大学 | Coal seam hydraulic slotting and combined fracturing comprehensive permeability increasing device |
| CN113914818A (en) * | 2021-11-26 | 2022-01-11 | 中煤科工集团重庆研究院有限公司 | Secondary grouting repair method for gas extraction failure drilling and hole sealing section |
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| CN103883303A (en) * | 2014-04-23 | 2014-06-25 | 重庆市能源投资集团科技有限责任公司 | Orientation jetting and fracturing exploitation method for coal bed gas under coal mine |
| CN104131832A (en) * | 2014-07-14 | 2014-11-05 | 中国矿业大学 | High-gas-content coal seam punching cutting pressing and sucking integral pressure relief and antireflection gas extraction method |
| CN104131832B (en) * | 2014-07-14 | 2016-08-17 | 中国矿业大学 | A kind of high gas layer rushes the release permeability-increasing gas pumping method of cutting, press and pumping integration |
| CN104314605B (en) * | 2014-08-15 | 2016-04-13 | 中国矿业大学 | A kind of multistage gas explosion fracturing coal body enhanced gas extraction method in 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 |
| CN104314605A (en) * | 2014-08-15 | 2015-01-28 | 中国矿业大学 | Enhanced extraction method for fracturing coal body by multistage gas explosion in drill hole |
| 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 |
| CN104481575A (en) * | 2014-11-06 | 2015-04-01 | 中国矿业大学 | Hot steam displacement gas method for improving gas extraction efficiency |
| CN104481575B (en) * | 2014-11-06 | 2016-06-08 | 中国矿业大学 | A kind of vapours displacement gas improves the method for gas pumping efficiency |
| CN104481452A (en) * | 2014-12-05 | 2015-04-01 | 中国矿业大学 | Method for sealing holes drilled through variable-frequency impulse grouting drilling |
| US10370942B2 (en) | 2015-01-06 | 2019-08-06 | China University Of Mining And Technology | Method for integrated drilling, flushing, slotting and thermal injection for coalbed gas extraction |
| WO2016110183A1 (en) * | 2015-01-06 | 2016-07-14 | 中国矿业大学 | Method for integrated drilling, flushing, slotting and thermal injection for coalbed gas extraction |
| CN104653161A (en) * | 2015-02-12 | 2015-05-27 | 中国矿业大学(北京) | Coal mine underground pulse hydraulic slot cutting-fracturing integral anti-reflection extraction device and method |
| CN104653161B (en) * | 2015-02-12 | 2018-04-06 | 中国矿业大学(北京) | The fracturing integrated anti-reflection drainage device of underground coal mine pulsed water slot and method |
| CN104763462A (en) * | 2015-04-07 | 2015-07-08 | 中国矿业大学 | Method for extracting high-pressure hydraulic cave-manufacturing gas from rock roadway crossing hole |
| CN106609677A (en) * | 2015-10-22 | 2017-05-03 | 中铁二局集团有限公司 | A gas extraction and discharge construction method |
| CN105422043A (en) * | 2015-12-15 | 2016-03-23 | 中国矿业大学 | Underground coal mine coal seam water injection and hydraulic fracturing drilled hole sealing method |
| CN105525901A (en) * | 2015-12-29 | 2016-04-27 | 中国矿业大学 | Coal seam hydrofracture strengthening permeability increasing method based on microwave irradiation |
| CN105484720B (en) * | 2015-12-29 | 2017-10-24 | 中国矿业大学 | The coal seam anti-reflection method that a kind of On Microwave-assisted Extraction is mutually cooperateed with hydraulic fracturing |
| CN105525901B (en) * | 2015-12-29 | 2017-10-24 | 中国矿业大学 | A kind of coal seam hydraulic fracture reinforcing anti-reflection method based on microwave irradiation |
| CN105484720A (en) * | 2015-12-29 | 2016-04-13 | 中国矿业大学 | Microwave-assisted extraction and hydrofracture cooperative coal seam anti-reflection method |
| CN109162704A (en) * | 2018-10-16 | 2019-01-08 | 中国矿业大学(北京) | The pre- attenuating drilling negative pressure attenuation test device of a kind of coal-bed gas |
| CN110219615A (en) * | 2019-05-31 | 2019-09-10 | 山东科技大学 | A kind of coal seam pulsed infusion borehole sealing device and method for sealing |
| CN110219615B (en) * | 2019-05-31 | 2021-11-05 | 山东科技大学 | Coal seam pulsating water injection drilling hole sealing device and hole sealing method |
| CN111101917A (en) * | 2019-12-20 | 2020-05-05 | 神华新疆能源有限责任公司 | Coal seam hydraulic fracturing combined resonance gas extraction method and hole packer |
| CN111101917B (en) * | 2019-12-20 | 2022-08-30 | 神华新疆能源有限责任公司 | Coal seam hydraulic fracturing combined resonance gas extraction method and hole packer |
| CN113431530A (en) * | 2021-06-29 | 2021-09-24 | 安徽理工大学 | Coal seam hydraulic slotting and combined fracturing comprehensive permeability increasing device |
| CN113914818A (en) * | 2021-11-26 | 2022-01-11 | 中煤科工集团重庆研究院有限公司 | Secondary grouting repair method for gas extraction failure drilling and hole sealing section |
| CN113914818B (en) * | 2021-11-26 | 2023-08-15 | 中煤科工集团重庆研究院有限公司 | Secondary grouting repairing method for gas extraction failure drilling hole sealing section |
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