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 PDFInfo
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- 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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- 239000003245 coal Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims description 19
- 238000005516 engineering process Methods 0.000 claims description 14
- 238000009434 installation Methods 0.000 claims description 9
- 238000005728 strengthening Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 239000004047 hole gas Substances 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000035699 permeability Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 8
- 238000000605 extraction Methods 0.000 description 4
- 238000005422 blasting Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000018199 S phase Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003667 anti-reflective effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
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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
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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
-
- 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
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- 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Pipeline Systems (AREA)
- Structures Of Non-Positive Displacement Pumps (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
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. down-hole gas detection in coal mine liquid two alternates and drives mutually a pressure break coal body strengthening gas pumping method, it is characterized in that: the method comprises the steps:
A. 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 side construction 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. in pressure break boring (1) aperture, connect fracturing unit, described fracturing unit comprises by water supply installation and the gas booster (5) of automatically controlling water tank (3), water pump (4) formation, 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), on the outlet pipe of water supply installation, gas booster (5) escape pipe and pressure break pipe (10) inlet tube, be respectively equipped with one way valve, overflow valve (9) is housed on high-pressure rubber pipe (8);
C. the spillway discharge of regulation relief valve (9), opens water pump (4), to be no more than the press water of 3MPa, through pressure break pipe (10), enters pressure break boring (1), 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, 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 side 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;
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.
Priority Applications (5)
| 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 |
| 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 |
| 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 |
| 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 |
Applications Claiming Priority (1)
| 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 |
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| Publication Number | Publication Date |
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| CN103541710A true CN103541710A (en) | 2014-01-29 |
| CN103541710B CN103541710B (en) | 2016-01-20 |
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| CN201310483277.XA Active 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 |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN103541710B (en) |
| AU (1) | AU2014336858B2 (en) |
| RU (1) | RU2616635C1 (en) |
| WO (1) | WO2015054984A1 (en) |
| ZA (1) | ZA201601542B (en) |
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| CN103993901A (en) * | 2014-04-25 | 2014-08-20 | 河南理工大学 | Method for increasing permeability through hydraulic huff and puff during outburst coal seam drilling |
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2013
- 2013-10-16 CN CN201310483277.XA patent/CN103541710B/en active Active
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- 2014-02-18 AU AU2014336858A patent/AU2014336858B2/en active Active
- 2014-02-18 RU RU2016108786A patent/RU2616635C1/en active
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Also Published As
| Publication number | Publication date |
|---|---|
| RU2616635C1 (en) | 2017-04-18 |
| ZA201601542B (en) | 2019-01-30 |
| AU2014336858B2 (en) | 2017-06-08 |
| AU2014336858A1 (en) | 2016-05-19 |
| CN103541710B (en) | 2016-01-20 |
| WO2015054984A1 (en) | 2015-04-23 |
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