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China's CNPC Develops Water-Based Drilling Fluid for Shale Gas Extraction

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BEIJING

CNPC Chuanqing Drilling Engineering Co., Ltd., a subsidiary of China National Petroleum Corporation (CNPC), has developed water-based drilling fluid for horizontal shale gas wells, said a release by CNPC on Wednesday. The new type of drilling fluid has been successfully applied in the drilling of four shale gas wells since June, CNPC said.