摘要
原位现场压水试验是获取岩层阻渗性能参数的可靠方法,为探究某煤矿深部煤层底板阻渗能力,采用现场压水试验方法对底板两段岩层进行了测试并获取了大量的实测数据。结果分析表明:该底板两测试段岩层在原始状态均不导渗,阻渗性较强,直至压裂导通才形成导渗条件;对两段岩层均进行了初次和重复两个压水过程,对比两次试验可知,测渗孔水压力与注水孔水压力的关联变化趋势大致相同,但初次压水的起始导渗水压明显高于重复压水,表明在初次压水后岩层的阻渗能力降低,更易形成导渗;采用渗透系数和阻渗强度作为指标,对底板岩层的阻渗性能进行了量化评价,结果表明测试岩层表现出明显的高阻弱渗的特点。
In situ field packer permeability test,being a reliable method to obtain the parameters of permeability barrier performance of strata,was used to explore this performance of deep coal seam floor.A large amount of measured data were obtained after the test on two layers of floor strata.The test results showed that these two layers of floor strata could not seep in initial state due to stronger barrier performance until the fracture and connection led to seepage.Co MPared with the first and repeated packer permeability tests on these two layers of floor strata,the variation of water pressure in measured pore was associated with that in water injection hole,but the seepage pressure in the first time was higher than that in second time,showing that the permeability barrier performance of strata turned weaker after first packer permeability test and was easy to form seepage.Using permeability coefficient and permeability barrier strength as indexes,the permeability barrier performance of floor strata has been quantitatively evaluated,and the results showed that the tested strata was characterized with high barrier performance and weak permeability.
出处
《中国煤炭》
北大核心
2014年第11期93-97,共5页
China Coal
基金
国家重点基础研究发展计划(973)项目(2013CB036003)
关键词
压水试验
渗透系数
阻渗性能
深部煤层
packer permeability test
the permeability coefficient
permeability barrier property
deep coal seam
