CN103541710B - Underground coal mine gas-liquid two-phase alternately drives pressure break coal body strengthening gas pumping method mutually - Google Patents

Underground coal mine gas-liquid two-phase alternately drives pressure break coal body strengthening gas pumping method mutually Download PDF

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Publication number
CN103541710B
CN103541710B CN201310483277.XA CN201310483277A CN103541710B CN 103541710 B CN103541710 B CN 103541710B CN 201310483277 A CN201310483277 A CN 201310483277A CN 103541710 B CN103541710 B CN 103541710B
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China
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pressure break
gas
water
pressure
boring
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CN201310483277.XA
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CN103541710A (en
Inventor
林柏泉
翟成
李全贵
倪冠华
彭深
余旭
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中国矿业大学
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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
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/295Gasification of minerals, e.g. for producing mixtures of combustible gases

Abstract

A kind of underground coal mine gas-liquid two-phase alternately drives pressure break coal body strengthening gas pumping method mutually, and constructing in this coal seam or wear in layer, pressure break is holed, water-guiding hole, carries out high pressure resistant sealing of hole to two borings; Connect fracturing unit, inject pressure break boring with the press water being no more than 3MPa, switch off the pump after fracturing 10min is implemented to pressure break boring, stop fracturing; Open gas booster and gas phase pressure break is carried out to pressure break boring, when pressure reaches 3MPa, close gas booster, stop gas phase pressure break; So repeatedly, when the water-guiding hole of distance pressure break boring side occurs that water flows out, stop fracturing, continue gas phase pressure break, when water-guiding hole current stop, or when having gas to gush out, terminate gas phase pressure break; Gas pumping pipe network is linked to pressure break boring and water-guiding hole, carries out gas pumping.The problem that after the method efficiently solves single fracturing, moisture entrapment hinders gas release and resolves, makes coal body internal crack grow more abundant, improves gas permeability of coal seam and gas pumping effect.

Description

Underground coal mine gas-liquid two-phase alternately drives pressure break coal body strengthening gas pumping method mutually
Technical field
The present invention relates to a kind of underground coal mine gas-liquid two-phase and alternately drive pressure break coal body strengthening gas pumping method mutually, belong to underground coal mine regional gas control technical field, the release being particularly useful for underground coal mine high gassy and low permeability coal seam is anti-reflection.
Background technology
China's coal-bed gas has the characteristic of micropore, low-permeability, high absorption, and the coal seam of more than 80% is high gassy and low permeability coal seam.The exploitation of high gassy and low permeability coal seam is often along with a large amount of Gas, and particularly along with the high-efficiency intensifying of coal production and the increase of mining depth, gas emission is increasing, and the threat of gas explosion and Gas Outburst danger is more and more serious.The major measure solving the gas problem in high gassy and low permeability coal seam recovery process implements coal bed gas extraction in advance, the conventional effective influence basin of gas pumping method is little, work plane drilling construction engineering quantity is large, extraction efficiency is low, is difficult to play ideal effect for high gassy and low permeability coal seam.To accomplish that extraction is up to standard, eliminating coal-bed gas disaster, needing to take anti-reflection method, expand the effective influence basin of one borehole, improve gas pumping effect.The anti-reflection measure of high gassy and low permeability coal seam release of current employing adopts artificial method to loosen original coal body in advance, improve the gas permeability in coal seam, the method mainly taked has following deep hole standing shot, water jet slotting technique, hydraulic flushing technology and down-hole coal bed hydraulic fracturing technology etc.There is the problems such as the effective influence basin of boring is little, workload large, complicated construction technique, extraction efficiency are low in deep hole standing shot, water jet slotting technique, hydraulic flushing technology.
One of major measure of hydraulic fracturing technology oil output is widely used in modern petroleum industry, also achieves certain effect in the application of underground coal mine.Along with the popularization of range of application, condition of coal seam occurrence are complicated and the increasing of low air permeability coal seam, hydraulic fracturing technology is restricted gradually, be mainly manifested in after weak seam mesohigh water enters coal body, by coal body capillary force action, shipwreck is to discharge, plug the passage of Gas, reduce hydraulic fracturing anti-reflection coal body, improve the effect of gas pumping.
Current, the investigation and application for coal mine underground gas pressure break is more common in high enegry gas fracturing (CO 2, N 2deng), for the anti-reflection certain effect that obtains of coal body, but high energy gas preparation, conveying and fracturing control all have certain difficulty, hinder the popularization that high energy air pressure splits.
Use for reference the thinking of high enegry gas fracturing, the blast using underground pressure air system to provide, utilizes gas booster, coordinates waterpower
Fracturing technique, forms underground coal mine gas-liquid two-phase and alternately drives pressure break coal body strengthening gas pumping technology mutually.
Summary of the invention
Technical problem: the deficiency for hydraulic fracturing technology in high methane low-permeable weak seam be the object of the invention is, propose gas-liquid two-phase and alternately drive pressure break coal body strengthening gas pumping method mutually, replace pressure break by gas-liquid two-phase, improve gas permeability of coal seam, thus improve gas pumping effect.
Technical scheme: underground coal mine gas-liquid two-phase of the present invention alternately drives pressure break coal body strengthening gas pumping method mutually, comprises the steps:
A. this coal seam or wear in layer construct a boring hole as pressure break, the boring of a same parameter of constructing in distance pressure break boring side is as water-guiding hole, the distance L that water-guiding hole and pressure break are holed is 2-4m, and technology installs pressure break pipe routinely, carries out high pressure resistant sealing of hole to two borings;
B. fracturing unit is connected at pressure break drilling orifice, the water supply installation that described fracturing unit comprises by automatically controlling water tank, water pump is formed and gas booster, the outlet pipe of water supply installation and the escape pipe of gas booster link together through Y shape threeway, the outlet of Y shape threeway is connected with pressure break pipe through high-pressure rubber pipe, the outlet pipe of water supply installation, gas booster escape pipe and pressure break tube inlet pipe are respectively equipped with one way valve, high-pressure rubber pipe is equipped with overflow valve;
C. the spillway discharge of regulation relief valve, opens water pump, enters pressure break boring, implement fracturing, after pressure break 10min, switch off the pump, stop fracturing to pressure break boring with the press water being no more than 3MPa through pressure break pipe;
D. open gas booster, gas phase pressure break is carried out to pressure break boring, when pressure reaches 3MPa, close gas booster, stop gas phase pressure break;
E. repeat step c, d many times, often repeat once to improve hydraulic pressure and air pressure 2-3MPa, when the water-guiding hole of distance pressure break boring side occurs that water flows out, stop fracturing, continue gas phase pressure break, when water-guiding hole current stop, or when having gas to gush out, terminate gas phase pressure break;
F. close the valve on pressure break pipe, remove fracturing unit, gas pumping pipe network is linked to pressure break boring and water-guiding hole, carries out gas pumping.
Beneficial effect: the present invention alternately drives fracturing coal body by waterpower mutually with gas gas-liquid two-phase, promote that coal body internal crack is grown, expansion and through, fracturing is utilized to drive gas, recycling gas phase pressure break drives waterpower, the problem hindering gas to discharge and resolve after efficiently solving single fracturing in moisture entrapment water, improves gas pumping effect.Meanwhile, gas-liquid two-phase alternately drives the advantage making full use of two-phase mutually, improves frac pressure step by step, and coal body internal crack is grown more abundant, coal body antireflective effect significantly improves.Its method is simple, easy to operate, will have practicality widely in the art.
Accompanying drawing explanation
Fig. 1 is that underground coal mine gas-liquid two-phase of the present invention alternately drives pressure break coal body strengthening gas pumping method schematic layout pattern mutually.
In figure: 1-pressure break is holed, 2-water-guiding hole, 3-automatically control water tank, 4-water pump, 5-gas booster, 6-1-one way valve one, 6-2-one way valve two, 6-3-one way valve three, 7-threeway, 8-high-pressure rubber pipe, 9-overflow valve, 10-pressure break pipe, 11-valve.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
Underground coal mine gas-liquid two-phase of the present invention alternately drives pressure break coal body strengthening gas pumping method mutually:
A. first this coal seam or wear in layer construct one boring as pressure break boring 1, the boring of a same parameter of constructing in 1 side of holing apart from pressure break is as water-guiding hole 2, water-guiding hole 2 and pressure break hole 1 distance L be 2-4m, technology installs pressure break pipe 10 routinely, carries out high pressure resistant sealing of hole to two borings;
B. pressure break hole 1 aperture place connect fracturing unit, and check the performance of fracturing equipment and gas frac equipment, described fracturing unit comprises by automatically controlling water tank 3, the water supply installation that water pump 4 is formed and gas booster 5, the outlet pipe of water supply installation and the escape pipe of gas booster 5 link together through Y shape threeway 7, the outlet of Y shape threeway 7 is connected with pressure break pipe 10 through high-pressure rubber pipe 8, the outlet pipe of water supply installation is provided with one way valve one 6-1, gas booster 5 escape pipe is provided with one way valve two 6-2, one way valve three 6-3 on the inlet tube of pressure break pipe 10, the high-pressure rubber pipe 8 that Y shape threeway 7 connects pressure break pipe 10 is equipped with overflow valve 9,
C. the spillway discharge of regulation relief valve 9, opens water pump 4, with the press water being no more than 3MPa successively by one way valve 6-1, threeway 7, high-pressure rubber pipe 8, enter pressure break boring 1 through pressure break pipe 10 again, fracturing is implemented to pressure break boring 1, after pressure break 10min, switch off the pump 4, stop fracturing;
D. open gas booster 5, gas phase pressure break is carried out to pressure break boring 1, regulates pressure by overflow valve 9, when pressure reaches 3MPa, close gas booster 5, stop gas phase pressure break;
E. repeat step c, d many times, often repeat once to improve hydraulic pressure and air pressure 2-3MPa, when the water-guiding hole 2 of 1 side of holing apart from pressure break occurs that water flows out, stop fracturing, continue gas phase pressure break, when water-guiding hole 2 current stop, or when having gas to gush out, terminate gas phase pressure break; Such as: be switch to gas phase pressure break after 3MPa low pressure pressure break boring 10min with water pressure, gaseous pressure switches to fracturing when reaching fracturing maximum pressure, improve water pressure to 6MPa, gas phase pressure break is switched to after pressure break 10min, gaseous pressure switches to fracturing when reaching fracturing maximum pressure, improve water pressure to 9MPa, after pressure break 10min, switch to gas phase pressure break, during maximum pressure when institute's phase pressure reaches fracturing, switch to fracturing.During water-guiding hole 2 water outlet, stop fracturing, switch to gas phase pressure break anhydrous to water-guiding hole, terminate fracturing work;
F. close the valve 11 on pressure break pipe 10, remove fracturing unit, gas pumping pipe network is linked to pressure break boring 1 and water-guiding hole 2, carries out gas pumping.

Claims (1)

1. underground coal mine gas-liquid two-phase alternately drives a pressure break coal body strengthening gas pumping method mutually, it is characterized in that: the method comprises the steps:
A. this coal seam or wear in layer construct one boring as pressure break boring (1), the boring of a same parameter of constructing in distance pressure break boring (1) side is as water-guiding hole (2), the hole distance L of (1) of water-guiding hole (2) and pressure break is 2-4m, technology installs pressure break pipe (10) routinely, carries out high pressure resistant sealing of hole to two borings;
B. fracturing unit is connected in pressure break boring (1) aperture, described fracturing unit comprises by automatically controlling water tank (3), the water supply installation that water pump (4) is formed and gas booster (5), the escape pipe of the outlet pipe of water supply installation and gas booster (5) links together through Y shape threeway (7), the outlet of Y shape threeway (7) is connected with pressure break pipe (10) through high-pressure rubber pipe (8), the outlet pipe of water supply installation, gas booster (5) escape pipe and pressure break pipe (10) inlet tube are respectively equipped with one way valve, overflow valve (9) high-pressure rubber pipe (8) is equipped with,
C. the spillway discharge of regulation relief valve (9), opens water pump (4), enters pressure break boring (1) with the press water being no more than 3MPa through pressure break pipe (10), fracturing is implemented to pressure break boring (1), after pressure break 10min, switch off the pump (4), stops fracturing;
D. open gas booster (5), gas phase pressure break is carried out to pressure break boring (1), when pressure reaches 3MPa, close gas booster (5), stop gas phase pressure break;
E. repeat step c, d many times, often repeat once to improve hydraulic pressure and air pressure 2-3MPa, when the water-guiding hole (2) of distance pressure break boring (1) side occurs that water flows out, stop fracturing, continue gas phase pressure break, when water-guiding hole (2) current stop, or when having gas to gush out, terminate gas phase pressure break;
F. close the valve (11) in pressure break pipe (10), remove fracturing unit, gas pumping pipe network is linked to pressure break boring (1) and water-guiding hole (2), carries out gas pumping.
CN201310483277.XA 2013-10-16 2013-10-16 Underground coal mine gas-liquid two-phase alternately drives pressure break coal body strengthening gas pumping method mutually CN103541710B (en)

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CN201310483277.XA CN103541710B (en) 2013-10-16 2013-10-16 Underground coal mine gas-liquid two-phase alternately drives pressure break coal body strengthening gas pumping method mutually
AU2014336858A AU2014336858B2 (en) 2013-10-16 2014-02-18 Method for enhanced fuel gas extraction by coal mine underground gas-liquid dual-phase alternating phase-driven fracturing of coal body
RU2016108786A RU2616635C1 (en) 2013-10-16 2014-02-18 Method of improved combustible gas recovery using underground two-phase gas-liquid variable based on phases of unworked coal fracturing in coal mine
PCT/CN2014/072187 WO2015054984A1 (en) 2013-10-16 2014-02-18 Method for enhanced fuel gas extraction by coal mine underground gas-liquid dual-phase alternating phase-driven fracturing of coal body
ZA2016/01542A ZA201601542B (en) 2013-10-16 2016-03-04 Method for enhanced fuel gas extraction by coal mine underground gas-liquid dual-phase alternating phase-driven fracturing of coal body

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RU2616635C1 (en) 2017-04-18
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