Extended-reach drilling extends life of CNOOC field

LIUHUA OIL FIELD-1China National Offshore Oil Corp. Ltd. (CNOOC) successfully used extended-reach drilling (ERD) to produce shallow carbonate reservoirs in the Liuhua oil field, South China Sea.The Liuhua 11-1 oil field is one of CNOOC’s South China Sea assets, developed in 1995. In the first 8 years of production, the water cut increased significantly and the production decreased at an alarming level.Without new technologies for additional drilling, production from the Liuhua 11-1 oil field would have ended in 2002. But CNOOC took steps to extend the life of the field.In 2001, CNOOC initiated an infill ERD project to use the existing wellbore to sidetrack to the east wing of the re...

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