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The Key Drilling Technique of Formation Protection for Coal-bed Methane

HUANG Zhi-qiang,JIANG Guang-zhong,ZHENG Shuang-jin,WANG Wei-ying,YUE Qian-sheng(CNPC Key Laboratory of Drilling Engineering;College of Petroleum Engineering,Yangtze University,Jingzhou 434023,Hubei,China)  
With the further deepening of oil exploration and development in China,the development of CBM entered into development and application at large-scale stage.Because of the specificity of CBM reservoirs,it was easy to cause formation damage in drilling,therefore it was of important and practical significance to study the key drilling techniques for protecting CBM reservoirs.The drilling damage mechanism of CBM reservoir was analyzed,the key techniques of drilling for protecting CBM reservoirs were discussed.It is considered that under-balanced drilling methods can be used for optimizing drilling parameters and calculating maximum allowable pipe running in speed,therefore CBM reservoirs are effectively protected and it provides a guidance for improving the development efficiency of CBM reservoirs.
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