CN104405358A - Method for fracturing coal seam by employing high-pressure gas - Google Patents

Method for fracturing coal seam by employing high-pressure gas Download PDF

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Publication number
CN104405358A
CN104405358A CN201410536825.5A CN201410536825A CN104405358A CN 104405358 A CN104405358 A CN 104405358A CN 201410536825 A CN201410536825 A CN 201410536825A CN 104405358 A CN104405358 A CN 104405358A
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China
Prior art keywords
pressure
coal seam
grouting pipe
boring
mucus
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CN201410536825.5A
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CN104405358B (en
Inventor
胡胜勇
冯国瑞
张钰亭
宋凯歌
李振
郭军
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Taiyuan University of Technology
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Taiyuan University of Technology
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • E21B43/261Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like
    • E21B33/138Plastering the borehole wall; Injecting into the formation

Abstract

The invention discloses a method for fracturing a coal seam by employing high-pressure gas. The method comprises the following steps: (1) tipsily drilling from a lower floor roadway of the coal seam to an upper coal seam; (2) inserting three pipes into a drill hole, and injecting polyurethane which is 20-50cm in thickness into the drill hole; (3) injecting cement mortar into the drill hole from a first grouting pipe, and shutting off a first which is arranged at the rear end of the first grouting pipe until the cement mortar overflows from a second grouting pipe; (4) injecting plugging mucilage glue containing particulate matters into the drill hole by virtue of the second grouting pipe after 12-24 hours; (5) injecting a high-pressure gas of which the pressure is 30-60MPa into the drill hole through a fracturing extraction pipe. According to the method disclosed by the invention, the plugging mucilage glue containing particulate matters is pressed into a pore fracture of a rock section under the effect of air pressure; the high-pressure gas is plugged by virtue of the mucilage glue; the problem of air leakage of the high-pressure gas in the coal seam fracturing process is effectively solved; the gas pressure of the fractured coal seam reaches the cracking pressure of the coal seam.

Description

A kind of method of high pressure gas fracturing coal seam
Technical field
The present invention relates to the method in high pressure gas fracturing coal seam, the high pressure gas fracturing method that especially a kind of country rock degree of porosity of being applicable to hole is higher.
Background technology
Measure that the release that current high gassy and low permeability coal seam generally adopts is anti-reflection comprises deep hole standing shot, water jet slotting technique, hydraulic flushing technology and down-hole coal bed hydraulic fracturing technology etc., but deep hole blasting, water jet slotting technique, hydraulic flushing technology exist the problems such as little, the workload of the effective influence basin of boring is large, complicated construction technique.
Hydraulic fracturing technology coal mine underground coal bed anti-reflection in achieve certain effect, the shortcoming of this technology is mainly manifested in after coal seam mesohigh water enters coal body, and by coal body capillary force action, shipwreck, to discharge, reduces the effect of hydraulic fracturing anti-reflection coal body.When pressure break medium becomes gas from water, above problem will be overcome, but there is compressibility due to gas, the frac pressure in employing gas pressure break coal seam will far above hydraulic pressure, then high pressure gas fracturing coal seam can face a sealing difficult problem, once poorly sealed, the gas pressure in pressure break coal seam just cannot reach the fracturing pressure in coal seam, causes the failure of high pressure gas fracturing coal seam.For this reason, the method in the high high pressure gas fracturing coal seam of a kind of sealing is urgently found.
Summary of the invention
The invention provides a kind of method of high pressure gas fracturing coal seam, on the basis ensureing drilling orifice high leakproofness, by coal bed fracturing.
Technical scheme of the present invention:
The method in high pressure gas fracturing coal seam, is characterized in that concrete technology step is as follows:
1) holed to superjacent Construction of Inclined by coal seam lower raft rock gangway, drilling axis and coal seam water planar inclination are greater than 20 °, and boring end exceedes coal seam 0.5 ~ 1m;
2) in boring, insert the first Grouting Pipe, the second Grouting Pipe and pressure break drainage tube, the polyurethane (3) being 20 ~ 50cm to boring injection thickness seals hell.
3) in boring, inject expansive cement by the first Grouting Pipe, until when expansive cement overflows from the second Grouting Pipe, close the first valve that the first Grouting Pipe rear end is arranged.
4), after 12 ~ 24h, in boring, inject the leak stopping mucus containing particle by the second Grouting Pipe, until when leak stopping mucus is overflowed from pressure break (extraction) pipe, close the second valve that the second Grouting Pipe rear end is arranged.
5) by pressure break (extraction) pipe to boring in injection pressure be the gases at high pressure of 30 ~ 60MPa, by containing particle leak stopping mucus be pressed into borehole circumference mucus diffusion region in.
6), when gas injection pressure drops to below 20MPa, after continuing gas injection 30 ~ 60min, pressure break is stopped.
Further, the first Grouting Pipe front end exceedes polyurethane front end 20 ~ 50cm, and pressure break (extraction) pipe front end is positioned at the intersection of boring and bottom, and the second Grouting Pipe front end is apart from pressure break (extraction) pipe front end 3 ~ 6m.
Further, in leak stopping mucus, particle is flyash, and the particle diameter of particle is 200 ~ 500 orders, percent by volume 5% ~ 15%.
Beneficial effect of the present invention: the leak stopping mucus containing particle under gas pressure is pressed in the porous dehiscence gap of rock section, adopt mucus blocking high-pressure gas, the leakage problem of effective solution coal bed fracturing process mesohigh gas, ensure that the gas pressure in pressure break coal seam reaches the fracturing pressure in coal seam.
Accompanying drawing explanation
Schematic diagram when Fig. 1 is embody rule of the present invention.
In figure: 1, the first valve, 2, floor roadway, 3, polyurethane, the 4, first Grouting Pipe, 5, expansive cement, 6, pressure break drainage tube, 7, mucus diffusion region, 8, crack, 9, coal seam, 10, particle, 11, leak stopping mucus, the 12, second Grouting Pipe, 13, boring, the 14, second valve.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described.
As shown in Figure 1, a kind of method of high pressure gas fracturing coal seam, is characterized in that concrete technology step is as follows:
1) be greater than 20 ° and acclivitous boring to superjacent construction with horizontal plane angle by coal seam lower raft rock gangway, boring end exceedes coal seam 0.5 ~ 1m.
2) insert the first Grouting Pipe, the second Grouting Pipe and pressure break drainage tube respectively in boring, drilling orifice adopts length to be the polyurethane seal of 20 ~ 50cm.
3) in boring, expansive cement is injected by the first Grouting Pipe, until expansive cement overflows from the second Grouting Pipe, now be full of expansive cement between the second Grouting Pipe front end and polyurethane front end, close the first valve that the first Grouting Pipe rear end is arranged, stop slip casting.
4) 12 ~ 24h is placed, after fully condensing Deng expansive cement, in boring, the leak stopping mucus containing particle is injected by the second Grouting Pipe, until leak stopping mucus is overflowed from pressure break drainage tube, now be full of leak stopping mucus between the second Grouting Pipe front end and pressure break drainage tube front end, close the second valve that the second Grouting Pipe rear end is arranged.
5) by pressure break drainage tube to boring in injection pressure be the gases at high pressure of 30 ~ 60MPa, gas injection 20 ~ 60min, now leak stopping mucus enters in borehole circumference mucus diffusion region under gas high pressure effect, and then be pressed in the porous dehiscence gap of rock section, the gas leak phenomenon of effective solution coal bed fracturing process mesohigh gas, ensure that the gas pressure in pressure break coal seam reaches the fracturing pressure in coal seam.
6) when gas injection pressure drops to below 20MPa, coal seam is described by pressure break, after lasting gas injection 30 ~ 60min makes crack grow further, stops pressure break.
Further, the first Grouting Pipe front end exceedes polyurethane front end 20 ~ 50cm, and pressure break (extraction) pipe front end is positioned at the intersection of boring and bottom, and the second Grouting Pipe front end is apart from pressure break (extraction) pipe front end 3 ~ 6m.
Further, in leak stopping mucus, particle is flyash, and the particle diameter of particle is 200 ~ 500 orders, percent by volume 5% ~ 15%.
Illustrate: these gases at high pressure comprise nitrogen, air, carbon dioxide or mist.
Particle (10) comprises flyash.
Leak stopping mucus (11) is the product commercially bought, and name of product is thickener, thickening agent or adhesion agent.

Claims (3)

1. the method in high pressure gas fracturing coal seam, is characterized in that comprising the steps:
(1) holed to superjacent Construction of Inclined by coal seam lower raft rock gangway, boring) axis and coal seam water planar inclination be greater than 20 °, and boring end exceedes coal seam 0.5 ~ 1m;
(2) in boring, insert the first Grouting Pipe, the second Grouting Pipe and pressure break drainage tube, in boring, inject thickness is that the polyurethane of 20 ~ 50cm seals hell;
(3) in boring, inject expansive cement by the first Grouting Pipe, until when expansive cement overflows from the second Grouting Pipe, close the first valve that the first Grouting Pipe rear end is arranged;
After (4) 12 ~ 24h, in boring, inject the leak stopping mucus containing particle by the second Grouting Pipe, until when leak stopping mucus is overflowed from pressure break drainage tube, close the second valve that the second Grouting Pipe rear end is arranged;
(5) by pressure break drainage tube to boring in injection pressure be the gases at high pressure of 30 ~ 60MPa, by containing particle leak stopping mucus be pressed into borehole circumference mucus diffusion region in;
(6), when gas injection pressure drops to below 20MPa, after continuing gas injection 30 ~ 60min, pressure break is stopped.
2. the method in high pressure gas fracturing coal seam according to claim 1, it is characterized in that, first Grouting Pipe front end exceedes polyurethane front end 20 ~ 50cm, and pressure break drainage tube front end is positioned at the intersection of boring and bottom, and the second Grouting Pipe front end is apart from pressure break drainage tube front end 3 ~ 6m.
3. the method in high pressure gas fracturing coal seam according to claim 1, is characterized in that, in leak stopping mucus, particle is flyash, and the particle diameter of particle is 200 ~ 500 orders, and the percent by volume that particle accounts for leak stopping mucus is 5% ~ 15%.
CN201410536825.5A 2014-10-13 2014-10-13 A kind of method in high pressure gas fracturing coal seam Active CN104405358B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104989356A (en) * 2015-06-10 2015-10-21 太原理工大学 Underground coal mine coal seam drilling high-pressure gas fracturing and permeability increasing method and system
CN105156134A (en) * 2015-06-30 2015-12-16 中国矿业大学 High-pressure gas multistage pre-splitting grouting transformation method for surrounding rock of deep soft rock roadways
CN105351001A (en) * 2015-11-16 2016-02-24 中国矿业大学 Gas extraction method for region reinforcement of gob-side entry retaining
CN106121696A (en) * 2016-08-12 2016-11-16 中冶华天工程技术有限公司 Anchor tube and the installation method of anchor tube and recovery method
CN106767204A (en) * 2016-12-20 2017-05-31 大连大学 The closing cold blasting method of blast hole liquid carbon dioxide
CN106907175A (en) * 2017-05-02 2017-06-30 中国矿业大学 The efficient extraction coal roadway stripe gas of base plate concordant long drilled holes staged fracturing and region outburst elimination method
CN108865626A (en) * 2018-08-07 2018-11-23 黄振锋 A kind of freeze concentration extraction process of base liquor
WO2019184147A1 (en) * 2018-03-27 2019-10-03 山东科技大学 Method for efficiently preventing impact ground pressure for low gas-permeability coal seam

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104989356A (en) * 2015-06-10 2015-10-21 太原理工大学 Underground coal mine coal seam drilling high-pressure gas fracturing and permeability increasing method and system
CN105156134A (en) * 2015-06-30 2015-12-16 中国矿业大学 High-pressure gas multistage pre-splitting grouting transformation method for surrounding rock of deep soft rock roadways
CN105351001A (en) * 2015-11-16 2016-02-24 中国矿业大学 Gas extraction method for region reinforcement of gob-side entry retaining
CN106121696A (en) * 2016-08-12 2016-11-16 中冶华天工程技术有限公司 Anchor tube and the installation method of anchor tube and recovery method
CN106767204A (en) * 2016-12-20 2017-05-31 大连大学 The closing cold blasting method of blast hole liquid carbon dioxide
CN106767204B (en) * 2016-12-20 2018-09-25 大连大学 Close the cold blasting method of blast hole liquid carbon dioxide
CN106907175A (en) * 2017-05-02 2017-06-30 中国矿业大学 The efficient extraction coal roadway stripe gas of base plate concordant long drilled holes staged fracturing and region outburst elimination method
CN106907175B (en) * 2017-05-02 2019-06-04 中国矿业大学 The efficient extraction coal roadway stripe gas of bottom plate concordant long drilled holes staged fracturing and region outburst elimination method
WO2019184147A1 (en) * 2018-03-27 2019-10-03 山东科技大学 Method for efficiently preventing impact ground pressure for low gas-permeability coal seam
CN108865626A (en) * 2018-08-07 2018-11-23 黄振锋 A kind of freeze concentration extraction process of base liquor

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