摘要
水分对煤层瓦斯运移的影响,是研究水力压裂等煤层增透技术必须考虑的因素。为了提高水力压裂技术在煤层增透应用中的效用,本文针对水分对瓦斯运移负效应进行了分析,并采用WYS-800伺服自动加载系统,设计实验,深入研究了三轴应力状态下,余吾煤业不同含水率煤样的渗透性能,论证了不同含水率煤在不同围压或者不同有效应力的情况下,其渗透率与渗透速度都随含水率不同呈非线性递减趋势。同时上述结论与水力压裂使裂隙结构改变从而渗透率增加的结论结合,以余吾煤矿为例,在工程应用中找到水力压裂的最佳影响半径,为水力压裂井的布置提供一定的理论和技术支撑。
The influence of water on the gas migration in coal seam is the factor that must be taken into account in the study of hydraulic fracturing. In order to improve the effectiveness of hydraulic fracturing technology in the application of coal seam permeability, this paper analyzes the negative effect of water on gas migration. The WYS-800 servo automatic loading system is used to design the experiment. The permeability of Yu-wu coal samples with different water content under the condition of three axial stress was studied. It is proved that under different confining pressures or different effective stresses, the permeability and seepage velocity are nonlinear decreasing trend with the water content. The conclusion is combined with conclusion that the hydraulic fracturing makes the fracture structure change and the permeability increases. At the same time, taking Yu-wu as an example, The optimum radius of hydraulic fracturing is found in engineering application, which provides theoretical and technical support for the layout of hydraulic fracturing wells.
作者
裴秋艳
王骏辉
王毅
PEI Qiuyan WANG Junhui WANG Yi(Taiyuan University of Technology, Taiyuan 030024, China China University of Mining and Technology, Xuzhou 221008, China)
出处
《中国矿业》
北大核心
2017年第3期161-165,共5页
China Mining Magazine
关键词
瓦斯运移
含水率
渗透性
孔隙
水力压裂
gas migration
water content
permeability
pore
hydraulic fracturing
