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Research on coalbed methane drilling fluid for horizontal well based on coal reservoir protection in Qinshui Basin

YUE Qian-sheng1,CHEN Jun1,ZOU Lai-fang2,JIANG Guang-zhong1,TIAN Zhong-lan2,YANG Heng-lin2(1.College of Chemistry and Environmental Engineering,Yangtze University,Jingzhou 434023,China;2.CNPC Drilling Engineering Technology Research Institute,Beijing 100195,China)  
Clear water for drilling fluid in CBM well has several defects,which includes water sensitivity for salinity difference,scaling damage between clear water and formation water,micro-particle invasion because of bad flocculation,and weak flow back ability.Clear water was modified for CBM horizontal well drilling fluid by addition of inorganic salt,surfactant,scale inhibitor and flocculant.Drilling fluid formulation optimized for CBM horizontal well is clear water+0.5%PXA+0.5%GPA,PXA and GPA are all reservoir protection agents.The performance test results show that this new drilling fluid has good compatibility between drilling fluid and formation water,good anti-swelling ability,strong flocculation ability and flow back easily.Clear water modified has excellent reservoir protection effect from damage.
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