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CN103541710A - Method for forcedly draining gas from underground gas and liquid alternate phase-drive fracture coal of coal mine - Google Patents

Method for forcedly draining gas from underground gas and liquid alternate phase-drive fracture coal of coal mine Download PDF

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Publication number
CN103541710A
CN103541710A CN201310483277.XA CN201310483277A CN103541710A CN 103541710 A CN103541710 A CN 103541710A CN 201310483277 A CN201310483277 A CN 201310483277A CN 103541710 A CN103541710 A CN 103541710A
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gas
fracturing
fracture
water
pressure
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CN103541710B (en
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林柏泉
翟成
李全贵
倪冠华
彭深
余旭
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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Publication of CN103541710A publication Critical patent/CN103541710A/en
Priority to PCT/CN2014/072187 priority patent/WO2015054984A1/en
Priority to AU2014336858A priority patent/AU2014336858B2/en
Priority to RU2016108786A priority patent/RU2616635C1/en
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Publication of CN103541710B publication Critical patent/CN103541710B/en
Priority to ZA2016/01542A priority patent/ZA201601542B/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose

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  • Mining & Mineral Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Pipeline Systems (AREA)

Abstract

The invention discloses a method for forcedly draining gas from underground gas and liquid alternate phase-drive fracture coal of a coal mine. The method includes constructing a fracture drilled hole and a water guide hole in a local coal seam or across seams and performing high-pressure-resistance sealing on the two drilled holes; connecting fracture equipment with the fracture drilled hole, injecting pressure water under the pressure not higher than 3MPa into the fracture drilled hole, performing hydraulic fracture on the fracture drilled hole for 10 minutes, then shutting off a water pump and stopping hydraulic fracture; starting a gas booster to perform gas-phase fracture on the fracture drilled hole, shutting off the gas booster when the pressure reaches 3MPa and stopping gas-phase fracture; repeating the same procedure by multiple times, stopping hydraulic fracture when water flows out of the water guide hole distanced from one side of the fracture drilled hole, continuing gas-phase fracture and finishing gas-phase fracture when water stops flowing out of the water guide hole or gas flows out; connecting the fracture drilled hole and the water guide hole into a gas drainage pipe network and draining the gas. The method has the advantages that the problem that water remains after single hydraulic fracture and prevents gas from being released and desorbed can be effectively solved, internal fracture of the coal can be developed sufficiently, and the gas permeability of the coal seams and a gas drainage effect can be improved.

Description

Down-hole gas detection in coal mine liquid two alternates and drives mutually pressure break coal body strengthening gas pumping method
Technical field
The present invention relates to a kind of down-hole gas detection in coal mine liquid two and alternate and drive mutually pressure break coal body strengthening gas pumping method, belong to coal mine lower area gas control technology field, be particularly useful under coal mine the release of high gassy and low permeability coal seam anti-reflection.
Background technology
China's coal-bed gas has the characteristic of micropore, low-permeability, high absorption, and more than 80% coal seam is high gassy and low permeability coal seam.The exploitation of high gassy and low permeability coal seam is often accompanied by 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 that solves the gas problem in high gassy and low permeability coal seam recovery process is to implement in advance coal bed gas extraction, the conventional effective influence basin of gas pumping method is little, work plane drilling construction engineering quantity is large, extraction efficiency is low, for high gassy and low permeability coal seam, is difficult to play ideal effect.If accomplish, extraction is up to standard, eliminates coal-bed gas disaster, need to take anti-reflection method, expands the effective influence basin of one borehole, improves gas pumping effect.The anti-reflection measure of high gassy and low permeability coal seam release adopting is at present to adopt artificial method loosening original coal body in advance, the gas permeability that improves coal seam, the method for mainly taking has following deep hole loosening blasting, water jet slot technology, hydraulic flushing technology and down-hole coal bed hydraulic fracturing technology etc.The problems such as deep hole loosening blasting, water jet slot technology, hydraulic flushing technology exist that the effective influence basin of boring is little, workload large, complicated construction technique, extraction efficiency are low.
One of major measure of hydraulic fracturing technology oil output is widely used in modern petroleum industry, and the application under coal mine has also obtained certain effect.Along with increasing of popularization, condition of coal seam occurrence complexity and the low air permeability coal seam of range of application, hydraulic fracturing technology is restricted gradually, being mainly manifested in weak seam mesohigh water enters after coal body, be subject to coal body capillary force action, shipwreck is to discharge, stopped up the passage of Gas, weakened hydraulic fracturing anti-reflection coal body, improved the effect of gas pumping.
Current, for research and the application of coal mine underground gas pressure break, be more common in high enegry gas fracturing (CO 2, N 2deng), for the anti-reflection certain effect of obtaining of coal body, but high energy gas preparation, conveying and fracturing control all have certain difficulty, have hindered the popularization that high energy air pressure splits.
Use for reference the thinking of high enegry gas fracturing, the blast that uses down-hole compressed-air system to provide, utilizes gas booster, coordinates waterpower
Fracturing technique, formation down-hole gas detection in coal mine liquid two alternates and drives mutually pressure break coal body strengthening gas pumping technology.
Summary of the invention
Technical problem: the object of the invention is the deficiency for hydraulic fracturing technology in high gas low-permeable weak seam, propose gas-liquid two-phase and alternately drive mutually pressure break coal body strengthening gas pumping method, by gas-liquid two-phase, replace pressure break, improve gas permeability of coal seam, thereby improve gas pumping effect.
Technical scheme: down-hole gas detection in coal mine liquid two of the present invention alternates and drives mutually pressure break coal body strengthening gas pumping method, comprises the steps:
A. the boring of constructing in this coal seam or in wearing layer is holed as pressure break, in the boring of the same parameter of a side construction of holing apart from pressure break as water-guiding hole, the distance L of water-guiding hole and pressure break boring is 2-4m, and technology is installed pressure break pipe routinely, and two borings are carried out to high pressure resistant sealing of hole;
B. at pressure break drilling orifice, connect fracturing unit, described fracturing unit comprises water supply installation and the gas booster forming by automatically controlling water tank, water pump, 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, on the outlet pipe of water supply installation, gas booster escape pipe and pressure break tube inlet pipe, be respectively equipped with one way valve, overflow valve is housed on high-pressure rubber pipe;
C. the spillway discharge of regulation relief valve, opens water pump, to be no more than the press water of 3MPa, through pressure break pipe, enters pressure break boring, and to pressure break, fracturing is implemented in boring, after pressure break 10min, switches off the pump, and stops fracturing;
D. open gas booster, to pressure break, gas phase pressure break is carried out in boring, when pressure reaches 3MPa, closes gas booster, stops gas phase pressure break;
E. repeating step c, d are many times, often repeat once to improve hydraulic pressure and air pressure 2-3MPa, when the water-guiding hole of the side of holing apart from pressure break occurs that water flows out, stop fracturing, continue gas phase pressure break, when water-guiding hole current stop, or while having gas to gush out, finish gas phase pressure break;
F. close the valve on pressure break pipe, remove fracturing unit, pressure break boring and water-guiding hole are linked to gas pumping pipe network, carry out gas pumping.
Beneficial effect: the present invention alternately drives fracturing coal body by waterpower mutually with gas gas-liquid two-phase, promote coal body internal crack grow, expand and connect, utilize fracturing to drive gas, recycling gas phase pressure break drives waterpower, efficiently solve after single fracturing and in moisture entrapment water, hinder the problem that gas discharges and resolves, improved gas pumping effect.Meanwhile, gas-liquid two-phase alternately drives the advantage that makes full use of two-phase mutually, improves step by step frac pressure, coal body internal crack is grown more abundant, and coal body antireflective effect significantly improves.Its method is simple, easy to operate, have in the art practicality widely.
Accompanying drawing explanation
Fig. 1 is that down-hole gas detection in coal mine liquid two of the present invention alternates and drives mutually pressure break coal body strengthening gas pumping method schematic layout pattern.
In figure: the boring of 1-pressure break, 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, three, the 7-threeway of 6-3-one way valve, 8-high-pressure rubber pipe, 9-overflow valve, 10-pressure break pipe, 11-valve.
The specific embodiment
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
Down-hole gas detection in coal mine liquid two of the present invention alternates and drives mutually pressure break coal body strengthening gas pumping method:
A. first in this coal seam or in wearing layer, construct a boring as pressure break boring 1, in the boring apart from a same parameter of pressure break boring 1 one sides constructions as water-guiding hole 2, water-guiding hole 2 is 2-4m with the distance L of pressure break boring 1, technology is installed pressure break pipe 10 routinely, and two borings are carried out to high pressure resistant sealing of hole;
B. at the pressure break 1 aperture place that holes, connect fracturing unit, and check the performance of fracturing equipment and gas fracturing unit, described fracturing unit comprises by automatically controlling water tank 3, water supply installation and gas booster 5 that water pump 4 forms, 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 is provided with one way valve one 6-1, gas booster 5 escape pipes are provided with one way valve two 6-2, one way valve three 6-3 on the inlet tube of pressure break pipe 10, on the high-pressure rubber pipe 8 of Y shape threeway 7 connection pressure break pipes 10, overflow valve 9 is housed,
C. the spillway discharge of regulation relief valve 9, opens water pump 4, with the press water that is 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, pressure break boring 1 is implemented to fracturing, after pressure break 10min, switch off the pump 4, stop fracturing;
D. open gas booster 5, pressure break boring 1 is carried out to gas phase pressure break, by overflow valve 9, regulate pressure, when pressure reaches 3MPa, close gas booster 4, stop gas phase pressure break;
E. repeating step c, d are many times, often repeat once to improve hydraulic pressure and air pressure 2-3MPa, when the water-guiding hole 2 apart from pressure break boring 1 one sides occurs that water flows out, stop fracturing, continue gas phase pressure break, when water-guiding hole 2 current stop, or while having gas to gush out, finish gas phase pressure break; For example: the water pressure of take switches to gas phase pressure break after 3MPa low pressure pressure break boring 10min, gaseous pressure switches to fracturing while reaching fracturing maximum pressure, improve water pressure to 6MPa, after pressure break 10min, switch to gas phase pressure break, gaseous pressure switches to fracturing while 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, finish fracturing work;
F. close the valve 11 on pressure break pipe 10, remove fracturing unit, pressure break boring 1 and water-guiding hole 2 are linked to gas pumping pipe network, carry out gas pumping.

Claims (1)

1.一种煤矿井下气液两相交替相驱压裂煤体强化瓦斯抽采方法，其特征在于：该方法包括如下步骤： 1. A coal mine underground gas-liquid two-phase alternating phase drive fracturing coal body enhanced gas drainage method, characterized in that: the method comprises the following steps: a．在本煤层或穿层中施工一个钻孔作为压裂钻孔（1），在距离压裂钻孔（1）一侧施工一个同样参数的钻孔作为导水孔（2），导水孔(2)与压裂钻孔(1)的距离L为2-4m，按常规技术安装压裂管(10)，对两个钻孔进行耐高压封孔； a. Construct a borehole in the coal seam or through the seam as the fracturing borehole (1), and construct a borehole with the same parameters on the side away from the fracturing borehole (1) as the water guide hole (2), and the water guide hole ( 2) The distance L from the fracturing borehole (1) is 2-4m, and the fracturing pipe (10) is installed according to conventional techniques, and the two boreholes are sealed with high pressure resistance; b. 在压裂钻孔（1）孔口连接压裂设备，所述压裂设备包括由自动控制水箱(3)、水泵(4)构成的供水装置和气体增压器（5），供水装置的出水管和气体增压器（5）的出气管经Y形三通（7）连接在一起，Y形三通（7）的出口经高压胶管(8)与压裂管(10)相连接，供水装置的出水管、气体增压器（5）出气管和压裂管(10)入口管上分别设有单向阀，高压胶管(8)上装有溢流阀(9)； b. Connect the fracturing equipment at the opening of the fracturing borehole (1), the fracturing equipment includes a water supply device composed of an automatic control water tank (3), a water pump (4), a gas booster (5), and a water supply device The outlet pipe of the gas booster (5) and the outlet pipe of the gas booster (5) are connected together through the Y-shaped tee (7), and the outlet of the Y-shaped tee (7) is connected with the fracturing pipe (10) through the high-pressure rubber hose (8) , the outlet pipe of the water supply device, the outlet pipe of the gas booster (5) and the inlet pipe of the fracturing pipe (10) are respectively provided with a one-way valve, and the high-pressure rubber hose (8) is equipped with an overflow valve (9); c. 调节溢流阀（9）的溢流量，打开水泵（4），以不超过3MPa的压力水经压裂管(10)进入压裂钻孔（1），对压裂钻孔（1）实施水力压裂，压裂10min后，关闭水泵（4），停止水力压裂； c. Adjust the overflow of the overflow valve (9), turn on the water pump (4), and enter the fracturing borehole (1) through the fracturing pipe (10) with a pressure of no more than 3 MPa. Implement hydraulic fracturing, and after 10 minutes of fracturing, turn off the water pump (4) and stop hydraulic fracturing; d. 开启气体增压器（5），对压裂钻孔（1）进行气相压裂，压力达到3MPa时，关闭气体增压器（4），停止气相压裂； d. Turn on the gas booster (5) to perform gas phase fracturing on the fracturing borehole (1). When the pressure reaches 3MPa, turn off the gas booster (4) to stop gas phase fracturing; e. 重复步骤c、d多次，每重复一次提高水压和气压2-3MPa，当距离压裂钻孔（1）一侧的导水孔（2）出现水流出时，停止水力压裂，继续气相压裂，当导水孔（2）水流停止，或有气体涌出时，结束气相压裂； e. Repeat steps c and d several times, increasing the water pressure and air pressure by 2-3MPa each time, and stop the hydraulic fracturing when water flows out from the water guide hole (2) on the side of the fracturing borehole (1). Continue gas-phase fracturing, and end gas-phase fracturing when the water flow in the water guide hole (2) stops or gas gushes out; f．关闭压裂管(10)上的阀门（11），拆除压裂设备，对压裂钻孔（1）和导水孔（2）联入瓦斯抽采管网，进行瓦斯抽采。 f. Close the valve (11) on the fracturing pipe (10), remove the fracturing equipment, and connect the fracturing borehole (1) and water guide hole (2) into the gas drainage pipe network for gas drainage.
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 Active CN103541710B (en)

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Application Number Priority Date Filing Date Title
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
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
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
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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