【摘要】 为了减少低透气性煤层瓦斯抽采钻孔工程量和提高瓦斯抽采效率,对低透气性煤层增透理论及技术应用进行了研究,基于煤层控制水力压裂概念,开发了煤矿井下水力压裂数值模拟与优化设计软件,提出了高承压上向孔和近水平孔的封堵方法,形成了压裂水分布范围探测关键技术,并进行现场应用。结果表明,通过定点定向定区域压裂实现了目标区域煤层的增透,控制水力压裂前后相比单孔瓦斯抽采量提高了5倍以上,部分工作面瓦斯抽采钻孔工程量减少了1/3,采掘工作面单产单进大幅提高,煤矿井下控制水力压裂是对常规水力压裂技术的改进和创新,能有效促进目标区域煤层增透、提高瓦斯治理效果。更多还原

【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.更多还原