摘要
随着中国煤矿开采规模、深度及强度的逐年加大,为进一步保障安全生产环境、降低安全事故发生的频度和烈度、提高资源回收率,煤层水压致裂的可控性是目前亟待研究的重要问题之一。煤层定向水压致裂技术利用钻孔煤层中的裂隙作为导向裂隙,在围岩应力与注水压力共同作用下,引导岩层破坏方向。基于水压致裂单裂隙压剪模型及断裂力学理论推导出定向水压致裂临界水压力,对煤层定向水压致裂机理进行研究。研究结果表明,定向裂隙的存在使得煤层水压致裂位置发生偏移,定向裂隙的角度和长度是影响煤层水压致裂破坏方向和临界注水压力的主要因素,这为煤层水压致裂可控性提供理论基础。
With increase of coal mining scale, depth and intensity in China, it need ensure safety in min- ing, reduce accidents occurred in the frequency and intensity, and improve the resources recovery rate. Controllability of hydraulic fracturing in coal seam is one of the important problems to study. Directional hydraulic fracturing technology take fractures around borehole in coal seam as a guide slit which is under pressure of rock stress and water injection can induce direction of rock damage. The paper is combined theory with numerical simulation, and studied on mechanism of directional hydraulic fracturing in coal seam. The result indicates that firstly, existence of directional fracture makes the hydraulic fracturing po- sition of coal seam deviate ; secondly, the angle and length of directional fracture can influence hydraulic fracturing damage direction and is the main factors of the critical water injection pressure.
出处
《西安科技大学学报》
CAS
2014年第6期664-669,共6页
Journal of Xi’an University of Science and Technology
基金
陕西省"13115"科技创新工程重大科技专项项目(2009ZDKG57)
陕西省重点科研计划项目(DK05JS005)
神华新疆能源公司重点项目(SHKJ200908)
关键词
煤层
定向
水压致裂
coal seam
directional
hydraulic fracturing
