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- Title
Key technology and application of controlled hydraulic fracturing and seams permeability improvement in underground coal mine.
- Authors
GUO Chen-ye; SHEN Da-fu; ZHANG Cui-lan; GUO Chen; WANG Shu-qi
- Abstract
In order to reduce an engineering quantity of the gas drainage borehole in low permeability seam and to improve the gas drainage efficiency, a study was conducted on the permeability improvement theory and technology application in a low permeability seam. Based on the controlled hydraulic fracturing conception of the seam, a hydraulic fracturing numerical simulation in the underground mine and the optimized design software were developed and a sealing method of a high pressurized upward borehole and horizontal borehole was provided. Thus the key technology to detect the fracturing water distribution scope was developed and the site application was conducted. The results showed that with a target, orientation and regional fracturing to realize a permeability improvement of the target regional seam, in comparison with the before and after the controlled hydraulic fracturing, the single borehole gas drainage volume was improved over five times, the gas drainage borehole engineering workload was reduced by 1/3 in some coal mining face, a single day coal production and driving rate of the gateway driving face was highly improved. The controlled hydraulic fracturing in the underground mine was an improvement and innovation of the conventional hydraulic fracturing technology and could effectively promote the seam permeability improvement in the target region and could improve the gas control effect.
- Publication
Coal Science & Technology (0253-2336), 2015, Vol 43, Issue 2, p114
- ISSN
0253-2336
- Publication type
Article
- DOI
10.13199/j.cnki.cst.2015.02.026