CN103147734A - Method for multi-section hydraulic fracture along coal layer of underground coal mine - Google Patents
Method for multi-section hydraulic fracture along coal layer of underground coal mine Download PDFInfo
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- CN103147734A CN103147734A CN2013100742702A CN201310074270A CN103147734A CN 103147734 A CN103147734 A CN 103147734A CN 2013100742702 A CN2013100742702 A CN 2013100742702A CN 201310074270 A CN201310074270 A CN 201310074270A CN 103147734 A CN103147734 A CN 103147734A
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Abstract
The invention discloses a method for multi-section hydraulic fracture along a coal layer of underground coal mine. The method comprises the steps as follows: a, drilling a transverse hole in a roof or floor rock layer and at least two branch holes for connecting the coal layer with the transverse hole; and b, filling the transverse hole and the branch holes with water by a fracture pump and fracturing the coal layer. According to the method, only one of the roof rock layer and the floor rock layer is better in lithological character and the transverse hole can be selectively drilled in the roof or floor rock layer with better lithological character, so that the drilling length and the hole forming rate of the transverse hole can be guaranteed and the length of a sealing hole is shorter; and the branch holes are filled with the water for fracture, so that the coal layer can be subjected to large-range fracture in the fracture process, the fracture efficiency is high, the breathability of the coal layer can be improved, and the danger of coal and gas outburst caused by pressing out a coal body can be avoided.
Description
Technical field
The present invention relates to a kind of coal bed fracturing technology, particularly suitable coal seam multistage hydraulic fracturing method under a kind of coal mine.
Background technology
Under coal mine, fracturing technique mostly is the fracturing technology of wearing layer or concordant single hole now.Wear a layer single hole fracturing technology and refer to bore one vertically run through base plate and arrive pressure break hole in the middle of the coal seam in the mine floor lane, the upper end in pressure break hole is positioned at the middle part, coal seam, implements the transverse hydraulic pressure break to the coal seam by water-filling in the pressure break hole; This fracturing process, the base plate lane of need to first constructing, then from the base plate lane the pressure of the drill ceasma, work progress is complicated, and the cycle is long, due to by single horizontal pressure break coal seam, vertical pressure break hole, pressure break is limited in scope, and generally needs a plurality of layer-through drillings of construction to carry out coal seam pressure break piecemeal, and operating efficiency is not high.The concordant fracturing technology refers to directly to bore a concordant hole in the coal seam, by the concordant hole fracturing being implemented in the coal seam; Because seam hardness is softer, thus the sealed borehole length in concordant hole must grow just can avoid the sealing of hole section the coal seam not by pressure break, cause the leakage of water under high pressure, and have the danger that causes coal and Gas Outburst in pressure break coal body process.
Therefore need to improve coal seam, colliery of the prior art downhole hydraulic fracturing technology, to solve the existing defective that layer or concordant single hole fracturing technology exist of wearing.
Summary of the invention
In view of this, the purpose of this invention is to provide under a kind of coal mine along coal seam multistage hydraulic fracturing method, existing wear that single-point pressure break, pressure break scope that layer single hole fracturing technology exists are little, inefficiency to solve, the sealed borehole length that concordant single hole fracturing technology exists is large, pressure break is limited in scope and extrude coal body easily causes the problems such as coal and Gas Outburst danger.
Along coal seam multistage hydraulic fracturing method, comprising under coal mine of the present invention:
Step a, bore a transverse holes in top board or floor strata, and be drilled into few two branched holes that connect coal seams and transverse holes;
Step b, by fracturing pump water filling in transverse holes and the branched hole, pressure break is implemented in the coal seam.
Further, also comprise along coal seam multistage hydraulic fracturing method the step a1 that is arranged between step a and step b under described coal mine: by slide sleeve packer with each branched hole packing.
Beneficial effect of the present invention: suitable coal seam multistage hydraulic fracturing method under coal mine of the present invention, only a lithology in top board and base plate is required better, the lithology that transverse holes can select to be drilled in top board or base plate is preferably in the rock stratum, the boring length that can guarantee transverse holes with become porosity, and make sealed borehole length shorter, do not bore branched hole in the base plate lane, bore process is simpler; This method is by implementing pressure break to the branched hole water-filling, thereby can implement multistage pressure break on a large scale to the coal seam in pressing crack construction, the pressure break high efficiency, and can increase gas permeability of coal seam and avoid extruding coal body and cause coal and Gas Outburst danger.
Description of drawings
Fig. 1 wears layer single hole fracturing to implement schematic diagram under traditional coal mine;
Fig. 2 is the first embodiment schematic diagram of suitable coal seam multistage fracturing under coal mine of the present invention;
Fig. 3 is the second embodiment schematic diagram of suitable coal seam multistage fracturing under coal mine of the present invention.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 2, along coal seam multistage hydraulic fracturing method, comprising under the present embodiment coal mine:
Step a, bore a transverse holes 3 in top board 1 rock stratum, and be drilled into few two branched holes 5 that connect coal seams 4 and transverse holes 3, in the present embodiment, the concrete quantity of branched hole is 6, certainly the quantity of branched hole 5 can be adjusted as required in different embodiments, the front end of branched hole described in the present embodiment 5 is positioned at the middle part in coal seam 4, and is better to the fracturing effect in coal seam;
Step b, by fracturing pump 7 water filling in transverse holes 3 and the branched hole 5, pressure break is implemented in the coal seam.
Along coal seam multistage hydraulic fracturing method, be chosen in the top board lithology and bore transverse holes 3 in the rock stratum preferably under the present embodiment coal mine, be easy to the pore-forming of transverse holes, do not bore branched hole 5 in the base plate lane, bore process is simpler; Certainly in different embodiments, if the lithology of base plate 2 rock stratum is better than the lithology of top board 1, also can be chosen in base plate 2 rock stratum and bores transverse holes 3(as shown in Figure 3), then bore the branched hole 5 that connects coal seam 4 and transverse holes 3, also can realize the object of the invention.This method can be chosen in lithology and bore preferably transverse holes 3 in the rock stratum, the boring length that can guarantee transverse holes 3 with become porosity, and make the sealed borehole length can be shorter; This method is by implementing pressure breaks to a plurality of branched hole 5 water-fillings, thereby can implement multistages pressure break on a large scale to coal seam 4 in pressing crack construction, the pressure break high efficiency, and can increase gas permeability of coal seam and avoid extruding coal body and cause coal and Gas Outburst danger.
As the improvement to the present embodiment, also comprise along coal seam multistage hydraulic fracturing method the step a1 that is arranged between step a and step b under this coal mine: by slide sleeve packer 6 with each branched hole 5 packings, by fracturing pump 7 once only to branched hole 5 water-fillings, realize pursuing hole pressure break piecemeal, can guarantee that like this hydraulic pressure size in each branched hole 5 is even, fracturing effect is better.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (2)
- Under a coal mine along coal seam multistage hydraulic fracturing method, it is characterized in that: comprising:Step a, bore a transverse holes in top board or floor strata, and be drilled into few two branched holes that connect coal seams and transverse holes;Step b, by fracturing pump water filling in the branched hole, pressure break is implemented in the coal seam.
- Under coal mine according to claim 1 along coal seam multistage hydraulic fracturing method, it is characterized in that: also comprise the step a1 that is arranged between step a and step b: by slide sleeve packer with each branched hole packing.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103883303A (en) * | 2014-04-23 | 2014-06-25 | 重庆市能源投资集团科技有限责任公司 | Orientation jetting and fracturing exploitation method for coal bed gas under coal mine |
| CN103899349A (en) * | 2014-04-23 | 2014-07-02 | 重庆市能源投资集团科技有限责任公司 | Coal seam gas extraction method and extraction hole radial drilling guide device |
| CN103912304A (en) * | 2014-04-23 | 2014-07-09 | 重庆市能源投资集团科技有限责任公司 | Method for locally extracting gas of soft coal seams |
| CN104234738A (en) * | 2014-07-21 | 2014-12-24 | 河南理工大学 | Low-permeability coal bed multi-branch directional drilling seam cutting anti-reflection method |
| CN104763398A (en) * | 2015-02-11 | 2015-07-08 | 中国石油集团长城钻探工程有限公司 | Mining method for deformed coal coalbed methane for V-shaped well bottom plate auxiliary layer |
| CN105781514A (en) * | 2014-12-17 | 2016-07-20 | 中国石油天然气股份有限公司 | Method for gas well fracturing |
| CN106640020A (en) * | 2016-11-24 | 2017-05-10 | 安徽理工大学 | Method for increasing air permeability of high-gassy low-air-permeability coal seam |
| CN107191171A (en) * | 2017-07-30 | 2017-09-22 | 华北科技学院 | Based on roof fracture seam net hydraulic fracturing coal seam anti-reflection method |
| CN107725020A (en) * | 2017-11-14 | 2018-02-23 | 中煤科工集团重庆研究院有限公司 | A kind of cherry coal rises to hydraulic fracturing anatonosis device and method step by step |
| CN108843320A (en) * | 2018-06-12 | 2018-11-20 | 王帆 | Shift to an earlier date outburst elimination method in the tunnel of coal mine tight roof full face |
| CN113756775A (en) * | 2021-09-27 | 2021-12-07 | 中煤科工集团重庆研究院有限公司 | Hydraulic permeability increasing process for large-dip-angle low-permeability coal seam |
| CN116480347A (en) * | 2023-06-26 | 2023-07-25 | 华能煤炭技术研究有限公司 | Hydraulic fracturing method for coal mine roof |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103883303A (en) * | 2014-04-23 | 2014-06-25 | 重庆市能源投资集团科技有限责任公司 | Orientation jetting and fracturing exploitation method for coal bed gas under coal mine |
| CN103899349A (en) * | 2014-04-23 | 2014-07-02 | 重庆市能源投资集团科技有限责任公司 | Coal seam gas extraction method and extraction hole radial drilling guide device |
| CN103912304A (en) * | 2014-04-23 | 2014-07-09 | 重庆市能源投资集团科技有限责任公司 | Method for locally extracting gas of soft coal seams |
| CN104234738A (en) * | 2014-07-21 | 2014-12-24 | 河南理工大学 | Low-permeability coal bed multi-branch directional drilling seam cutting anti-reflection method |
| CN105781514A (en) * | 2014-12-17 | 2016-07-20 | 中国石油天然气股份有限公司 | Method for gas well fracturing |
| CN104763398A (en) * | 2015-02-11 | 2015-07-08 | 中国石油集团长城钻探工程有限公司 | Mining method for deformed coal coalbed methane for V-shaped well bottom plate auxiliary layer |
| CN106640020A (en) * | 2016-11-24 | 2017-05-10 | 安徽理工大学 | Method for increasing air permeability of high-gassy low-air-permeability coal seam |
| CN107191171A (en) * | 2017-07-30 | 2017-09-22 | 华北科技学院 | Based on roof fracture seam net hydraulic fracturing coal seam anti-reflection method |
| CN107725020A (en) * | 2017-11-14 | 2018-02-23 | 中煤科工集团重庆研究院有限公司 | A kind of cherry coal rises to hydraulic fracturing anatonosis device and method step by step |
| CN107725020B (en) * | 2017-11-14 | 2019-06-07 | 中煤科工集团重庆研究院有限公司 | A kind of cherry coal rises to hydraulic fracturing anatonosis device and method step by step |
| CN108843320A (en) * | 2018-06-12 | 2018-11-20 | 王帆 | Shift to an earlier date outburst elimination method in the tunnel of coal mine tight roof full face |
| CN113756775A (en) * | 2021-09-27 | 2021-12-07 | 中煤科工集团重庆研究院有限公司 | Hydraulic permeability increasing process for large-dip-angle low-permeability coal seam |
| CN116480347A (en) * | 2023-06-26 | 2023-07-25 | 华能煤炭技术研究有限公司 | Hydraulic fracturing method for coal mine roof |
| CN116480347B (en) * | 2023-06-26 | 2023-11-07 | 华能煤炭技术研究有限公司 | Hydraulic fracturing method for coal mine roof |
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Application publication date: 20130612 |