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《Journal of China Coal Society》 2012-01
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Lab investigation on damage mechanism of coal reservoir for pinnate horizontal well based on coalbed methane

YUE Qian-sheng1,ZOU Lai-fang2,JIANG Guang-zhong1,TIAN Zhong-lan2,HU You-lin3,HUANG Zhi-qiang3(1.College of Chemistry and Environmental Engineering,Yangtze University,Jingzhou 434023,China;2.CNPC Drilling Engineering Technology Research Institute,Beijing 100195,China;3.Petroleum Engineering College,Yangtze University,Jingzhou 434023,China)  
Taking No.3 coal in Qinshui Basin as research object,factors such as solid phase of drilling fluid,water sensitivity,stress sensitivity,scaling,capillarity and polymer plugging which maybe damage coal reservoir were researched during coalbed methane drilling.Sample results analyzed show that No.3 coal reservoir has low porosity and low permeability,high content of clay mineral.Lab evaluation results show water sensitivity,scaling,solid phase invasion of drilling fluid and polymer plugging are factors which induce the coal reservoir damage.Drilling fluid which has suitable salinity,suitable density,anti-scaling,and removable drilling fluid agents can protect coal reservoir from damage during drilling for pinnate horizontal wells.
【Fund】: 大型油气田及煤层气开发国家科技重大专项资助项目(2011ZX05036-001)
【CateGory Index】: P618.13
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