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《Journal of China Coal Society》 2015-S2
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Development and application of degradable polymer drilling fluid for coalbed methane horizontal well

YUE Qian-sheng;LI Gui-chuan;LI Dong-xian;SHEN Yuan-bo;College of Chemistry and Environmental Engineering,Yangtze University;China United Coalbed Methane Corporation,Ltd.;Oilfield Production Department of COSL;CNOOC Energy Tech-Drilling & Production Co.;  
To solve the problem of borehole instability caused by clear water,a degradable polymer drilling fluid for coalbed methane horizontal well was developed,whose formula is: clear water + 0. 1% soda + 0. 5% degradable polymer+ 1. 0% water-based lubricant. Performance tests show that the degradable polymer drilling fluid has a better anti-clayswelling ability,and compared with clear water,its invasion depth is shallower. Moreover,the degradable polymer drilling fluid has little influence on the strength of coal rock,which ensures the borehole stability of coal rock. Core flow tests show the degradable polymer drilling fluid has some contamination on coal reservoir,but the pollutants can be removed by using broken fluid. The degradable polymer drilling fluid was applied successfully in six U-shape wells,which can increase the stability of CBM borehole,and effectively protect coal reservoir combined with broken fluid.
【Fund】: 国家科技重大专项资助项目(2011ZX05036-001);; 国家自然科学基金资助项目(51574040)
【CateGory Index】: TE254
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