CN103195467B - Hydraulic fracturing and grouting solidification combined rock cross-cut coal uncovering method - Google Patents

Hydraulic fracturing and grouting solidification combined rock cross-cut coal uncovering method Download PDF

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Publication number
CN103195467B
CN103195467B CN201310112121.0A CN201310112121A CN103195467B CN 103195467 B CN103195467 B CN 103195467B CN 201310112121 A CN201310112121 A CN 201310112121A CN 103195467 B CN103195467 B CN 103195467B
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China
Prior art keywords
grouting
coal
hole
coal seam
fracturing
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CN201310112121.0A
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Chinese (zh)
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CN103195467A (en
Inventor
李栋
覃乐
郭臣业
周东平
余模华
王联
周俊杰
徐涛
张翠兰
张迪
何苗
周声才
沈大富
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重庆市能源投资集团科技有限责任公司
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Abstract

The invention discloses a hydraulic fracturing and grouting solidification combined rock cross-cut coal uncovering method which includes that when roadway drivage reaches a 10m coal layer vertical distance, fracturing holes of a coal layer are drilled, the coal layer is subjected to hydraulic fracturing, and the water injection amount reaches the preset value after above 3MPa pressure drop appears in fracturing; a plurality of grouting holes are drilled when the roadway drivage reaches a 5m coal layer vertical distance; coal layer methane gases are extracted through the fracturing holes and the grouting holes; the coal layer is subjected to quantitative grouting through the grouting holes with grouting pressure to be above 15MPa; and roadway drivage is continued after grouting solidification, and rock cross-cut coal uncovering is completed. Single hole grouting amount includes grouting hole grouting amount M1 and coal layer permeation grouting amount M2 and is calculated according to M=M1+M2=rho*eta/K *(pi*D<2>/4 *L +pir<2>*l*P)*10<-6>, wherein rho is a grouting density, eta is a storage coefficient, K is a grouting foaming expansion rate, D is a drilling diameter, L is grouting hole length, r is a penetration radius of slurry in the coal layer, l is length of the grouting holes in the coal layer and p is a coal layer porosity. The hydraulic fracturing and grouting solidification combined rock cross-cut coal uncovering method has the advantages of being capable of fast and safely performing rock cross-cut coal uncovering, avoiding re-handling, and improving social benefit.

Description

A kind of fracturing solidifies with slip casting the coal uncovering method combined

Technical field

The present invention relates to a kind of coal uncovering method, especially a kind of fracturing being applicable to have strong prominent dangerous low-permeable weak seam solidifies with slip casting the quick coal uncovering method combined.

Background technology

In the roadway construction in the mine that outburst hazard is high, the most easily there is coal and gas prominent that is extensive, high strength when crossdrift exposes coal seam, seriously govern the safe and efficient production of mine.Crossdrift protrusion-dispelling method for uncovering coal of the prior art is more, comprises Gas pre-drainage destressing method, coal body solidification method etc.All must containing according to " coal and gas outburst prominent controlling regulation " in various method, carry out according to a conventional method in tunnelling process take off crossdrift before to construct the step of gas pumping hole and mash gas extraction.But along with the increase of the coal mining degree of depth, coal and gas prominent problem seems more and more serious, takes single extinction measure to be difficult to reach the object of safety, rapid uncovering coal.China Patent Publication No. CN101598030A, December 9 2009 publication date, invention and created name " method for realizing fast coal exposing of coal seam rock cross with outburst danger ", disclose a kind of method Gas pre-drainage release be combined with coal body Stationary liquid, comprise by high-pressure water jet slot, the technology such as hydraulic flushing in hole or loosening big gun is destroyed coal seam in crossdrift periphery certain limit, then gas pumping release is carried out, a stiffening ring is manufactured again by grout injection in the certain thickness coal seam of crossdrift periphery, thus form an operator guards, to guarantee to take off crossdrift safety, the method is applicable to the stone door punching coal with strong prominent dangerous coal seam.But, this takes off crossdrift method in implementation process, the technology such as the high-pressure water jet slot, hydraulic flushing in hole or the loosening big gun that adopted to the damage envelope of coal body and the crack that produces in damage envelope limited, and, weigh the aeration level in coal seam and be the key element guaranteed to take off crossdrift safety and raise the efficiency to the reasonability of the Selecting parameter such as coal seam grouting amount, but it is unexposed in this technical scheme, therefore, colleague also needs to carry out necessary groping and experiment experience accumulation in specific implementation process, is not easy to directly apply., require further improvement for this reason, to facilitate colleague same nature colliery directly to adopt, avoid the duplication of labour, improve industry and take off crossdrift level, improve social benefit.

Summary of the invention

The object of the invention is for the deficiencies in the prior art, a kind of dangerous seam with potential fracturing is provided to solidify with coal body the coal uncovering method combined, with the object reached fast, safety exposes coal and gas prominent coal seam, simultaneously, be convenient to go together and directly adopt, avoid the duplication of labour, improve social benefit.

For achieving the above object, the present invention adopts following technical scheme.

Fracturing solidifies with slip casting the coal uncovering method combined, and comprises the following steps:

A, when tunnelling to apart from coal seam hang down apart from 10m time, pressure break hole is crept into along tunnelling direction, until penetrate coal seam, sealing pores is carried out to pressure break hole, and by pressure break hole, fracturing is carried out to coal-bed flooding, after frac pressure continues to rise to the Pressure Drop △ P of appearance one setting value, after keeping pressure break to water injection rate to reach predicted value, stop pressure break;

B, in tunnelling to when hanging down apart from 5m apart from coal seam, dig ear shape drill site at roadway's sides, construction penetrates multiple injected holes in coal seam, and the boring scope of injected hole is the outer 2 ~ 2.5m of drift section outline line;

C, in injected hole, install Grouting Pipe, sealing pores is carried out to injected hole, and by pressure break hole and injected hole draining coal seam gas to setting requirement;

D, select arbitrary injected hole treating slip casting, by Grouting Pipe to the slurries can reinforced coal seam after pressure injection in its hole solidifies, and temporary plugging all the other treat the injected hole of slip casting; Its grouting pressure, at more than 15MPa, when reaching setting grouting amount, stops slip casting;

E, circulation step d, until complete the slip casting to all injected holes;

F, until grout curing and check up to standard after, conventionally carry out tunnelling and through coal seam, complete stone door punching coal work;

Described Pressure Drop △ P is generally more than 3MPa; Described grouting amount comprises the grouting amount M in injected hole 1with the grouting amount M of diffusion in coal seam 2, its single hole slip casting total amount is calculated as follows:

;

In formula: serum density, kg/m 3;

reserve factor, gets 1.1 ~ 1.2 usually;

slurries coefficient of foaming, gets 1.3 ~ 1.4 usually;

injected hole diameter, unit mm;

injected hole length, unit m;

the penetration radius of slurries in coal seam, is determined by seam contrast and fracturing effect, unit mm;

injected hole is length in coal seam, unit m;

coal seam porosity.

Described fracturing estimates that water injection rate should be determined according to institute's pressure break coal seam specific features; Described pressure break bore dia is 95mm; Described injected hole diameter is 75mm; Described Grouting Pipe adopts diameter to be the seamless steel pipe of 12.5mm.

The invention has the beneficial effects as follows: first the present invention by carrying out fracturing to coal and rock, coal body is impelled to produce a large amount of through cracks, coal and rock is on a large scale after release mash gas extraction, again to this region boring grouting reinforcing, substantially increase the intensity of coal and rock, thus outstanding and percussion when effectively resisting exposed coal, reach the object of fast and safely exposed coal.While fracturing makes coal and rock produce a large amount of crack, release the stress primitively of a part, ensure that slurries inject smoothly, and expand the scope of grouting and reinforcing.This cover method, under the prerequisite guaranteeing safe coal-openning, can reduce extinction engineering quantity, shorten construction period, meet the needs of projecting coal bed fast and safely stone door punching coal by force.Meanwhile, pressure drop values when The present invention gives pressure break and the grouting pressure of slip casing by pressure and grouting amount, avoid colleague to carry out the duplication of labour, can bring significant social benefit.

Accompanying drawing explanation

The arrangement schematic diagram in Fig. 1 to be fracturing of the present invention with slip casting solidify pressure break hole 3 in the coal uncovering method combined, injected hole 4 and tunnel.

Fig. 2 is the A-A sectional drawing in Fig. 1.

Fig. 3 is the B-B sectional drawing in Fig. 1.

Fig. 4 is the position relationship schematic diagram of injected hole 4 and Grouting Pipe 7.

Detailed description of the invention

Below in conjunction with accompanying drawing, the present invention is further illustrated, but therefore do not limit the present invention among described scope of embodiments.

See Fig. 1, Fig. 2, Fig. 3, Fig. 4, a kind of fracturing solidifies with slip casting the coal uncovering method combined, and it is characterized in that, comprises the following steps:

A, when tunnel 6 is tunneled to when hanging down apart from 10m apart from coal seam 1, pressure break hole 3 is crept into along tunnel 6 tunneling direction, until penetrate coal seam 1, sealing pores is carried out to pressure break hole 3, and carry out fracturing by coal seam 1 water filling of 3 pairs, pressure break hole, after frac pressure continues to rise to the Pressure Drop △ P of appearance one setting value, after keeping pressure break to water injection rate to reach predicted value, stop pressure break;

B, tunnel to when hanging down apart from 5m apart from coal seam 1 in tunnel 6, in tunnel, 6 liang of sides dig ear shape drill site 5, and construction penetrates multiple injected holes 4 in coal seam 1, and the boring scope of injected hole 4 is the outer 2 ~ 2.5m of tunnel 6 range line profile;

C, in injected hole 4, install Grouting Pipe 7, sealing pores is carried out to injected hole 4 and forms sealing of hole section 8, and by pressure break hole 3 and injected hole 4 extraction coal seam 1 gas to setting requirement;

D, select arbitrary injected hole 4 treating slip casting, by Grouting Pipe 7 to the slurries can reinforced coal seam after pressure injection in its hole solidifies, and temporary plugging all the other treat the injected hole 4 of slip casting; Its grouting pressure, at more than 15MPa, when reaching setting grouting amount, stops slip casting;

E, circulation step d, until the slip casting completing to all injected holes 4;

F, until grout curing and check up to standard after, conventionally carry out tunnelling and through coal seam, complete stone door punching coal work;

Described Pressure Drop △ P is generally more than 3MPa; Described grouting amount comprises the grouting amount M in injected hole 4 1with the grouting amount M of diffusion in coal seam 1 2, its single hole slip casting total amount is calculated as follows:

;

In formula: serum density, kg/m 3;

reserve factor, gets 1.1 ~ 1.2 usually;

slurries coefficient of foaming, gets 1.3 ~ 1.4 usually;

injected hole diameter, unit mm;

injected hole 4 length, unit m;

the penetration radius of slurries in coal seam 1, is determined by seam contrast and fracturing effect, unit mm;

injected hole 4 length in coal seam, unit m;

coal seam porosity.

Described fracturing estimates that water injection rate should be determined according to institute's pressure break coal seam specific features; Described pressure break hole 3 diameter is 95mm; Described injected hole 4 diameter is 75mm; Described Grouting Pipe 7 adopts diameter to be the seamless steel pipe of 12.5mm.

Although combine above and drawings describe embodiments of the present invention, but those of ordinary skill in the art also can recognize in the scope to claims and makes various change or amendment, these modifications and variations are interpreted as within scope of the present invention and intention.

Claims (3)

1. fracturing solidifies with slip casting the coal uncovering method combined, and it is characterized in that, comprises the following steps:
A, when tunnel (6) driving to apart from coal seam (1) hang down apart from 10m time, pressure break hole (3) is crept into along tunnel (6) tunneling direction, until penetrate coal seam (1), sealing pores is carried out to pressure break hole (3), and by pressure break hole (3), fracturing is carried out to coal seam (1) water filling, after frac pressure continues to rise to the Pressure Drop △ P of appearance one setting value, after keeping pressure break to water injection rate to reach predicted value, stop pressure break;
B, tunnel (6) driving to apart from coal seam (1) hang down apart from 5m time, help to dig ear shape drill site (5) in tunnel (6) two, construction penetrates multiple injected holes (4) in coal seam (1), and the boring scope of injected hole (4) is the outer 2 ~ 2.5m of tunnel (6) range line profile;
C, in injected hole (4), install Grouting Pipe (7), sealing pores is carried out to injected hole (4), and by pressure break hole (3) and injected hole (4) extraction coal seam (1) gas to setting requirement;
D, select arbitrary injected hole (4) treating slip casting, the slurries can reinforced coal seam after being solidified by pressure injection in Grouting Pipe (7) Xiang Qikong, and temporary plugging all the other treat the injected hole (4) of slip casting; Its grouting pressure, at more than 15MPa, when reaching setting grouting amount, stops slip casting;
E, circulation step d, until complete the slip casting to all injected holes (4);
F, until grout curing and check up to standard after, conventionally digging laneway through coal seam, complete stone door punching coal work;
Described Pressure Drop △ P is more than 3MPa; Described grouting amount comprises the grouting amount M in injected hole (4) 1with the grouting amount M of diffusion in coal seam (1) 2, its single hole slip casting total amount is calculated as follows:
In formula: serum density, kg/m 3;
reserve factor, gets 1.1 ~ 1.2 usually;
slurries coefficient of foaming, gets 1.3 ~ 1.4 usually;
injected hole (4) diameter, unit mm;
injected hole (4) length, unit m;
the penetration radius of slurries in coal seam (1), is determined by seam contrast and fracturing effect, unit mm;
injected hole (4) length in coal seam, unit m;
coal seam porosity.
2. fracturing according to claim 1 solidifies with slip casting the coal uncovering method combined, and it is characterized in that, described pressure break hole (3) diameter is 95mm; Described injected hole (4) diameter is 75mm; Described Grouting Pipe (7) adopts diameter to be the seamless steel pipe of 12.5mm.
3. fracturing according to claim 1 solidifies with slip casting the coal uncovering method combined, and it is characterized in that, described fracturing estimates that water injection rate should be determined according to institute's pressure break coal seam specific features.
CN201310112121.0A 2013-04-02 2013-04-02 Hydraulic fracturing and grouting solidification combined rock cross-cut coal uncovering method CN103195467B (en)

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CN103510957B (en) * 2013-10-08 2016-04-20 中国矿业大学 A kind of combined type coal uncovering method
CN103899348A (en) * 2014-04-23 2014-07-02 重庆市能源投资集团科技有限责任公司 Method for fast extracting gas on coalface
CN104074539B (en) * 2014-07-22 2016-05-11 贵州大学 One is held back gas drainage under suction structure and implementation method thereof
CN104213932B (en) * 2014-08-07 2016-03-02 中国矿业大学 A kind of projecting coal bed waterpower phase transformation fracturing coal uncovering method
CN104213921B (en) * 2014-08-07 2016-03-30 中国矿业大学 Based on the freezing type coal uncovering method of hydraulic slotted liner technique
CN105003294B (en) * 2015-07-30 2017-09-29 山东科技大学 One kind is based on hydrothermal reaction coupling pressure break coal body coal uncovering method
CN105221182B (en) * 2015-09-21 2017-11-17 河南理工大学 Coal uncovering method under the complex geological condition of pole
CN105781552A (en) * 2016-03-07 2016-07-20 安徽理工大学 Novel high-gas outburst coal seam stereoscopic punching crosscut coal uncovering method
CN108386193A (en) * 2018-02-02 2018-08-10 陕西煤业化工技术研究院有限责任公司 A kind of hard integrality top plate chemically expansible pressure break pressure relief method in end
CN108590739B (en) * 2018-04-11 2019-10-29 中国平煤神马能源化工集团有限责任公司 A kind of prominent tunnel regionality energy divides source to control anti-burst method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2121062C1 (en) * 1997-04-15 1998-10-27 Московский государственный горный университет Method of withdrawal of methane from coal bed
CN101581231A (en) * 2009-06-16 2009-11-18 煤炭科学研究总院沈阳研究院 Gas drainage method for loosening coal body through cross layer boring and hydraulic fracture
CN101603431A (en) * 2009-07-14 2009-12-16 中国矿业大学 A kind of method for reinforcing outburst-prone coal seam cross-cut coal uncovering

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2436576B (en) * 2006-03-28 2008-06-18 Schlumberger Holdings Method of facturing a coalbed gas reservoir

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2121062C1 (en) * 1997-04-15 1998-10-27 Московский государственный горный университет Method of withdrawal of methane from coal bed
CN101581231A (en) * 2009-06-16 2009-11-18 煤炭科学研究总院沈阳研究院 Gas drainage method for loosening coal body through cross layer boring and hydraulic fracture
CN101603431A (en) * 2009-07-14 2009-12-16 中国矿业大学 A kind of method for reinforcing outburst-prone coal seam cross-cut coal uncovering

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
水力压裂与强化抽放石门快速揭煤技术;王文选等;《煤矿安全》;20100710(第7期);第27-30页 *
采用注浆加固技术防止石门揭煤时煤与瓦斯突出;杨志刚等;《煤矿安全》;20070110(第1期);第9-11页 *
鹤煤四矿突出石门快速揭煤技术的研究及应用;华敬涛等;《煤》;20110315;第20卷(第3期);第22-25页 *

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