Keijin Gu, Yiqun Ye Nan Hai East Oil Corp. Guangzhou, Peoples Republic of China For the Liuhua 11-1 oil field development, extended drill stem tests showed that horizontal wells were more suitable than either vertical or high-angle deviated wells. Advantages of horizontal wells included three to four times increased productivity over the vertical well, slower water coning from the aquifer, and greater ultimate recovery from a single well. LIUHUA 11-1 FIELD The Liuhua 11-1 oil field is in the western part of the South China sea contract area 29/04, about 121 miles southeast of Hong Kong (Fig. 1). Water depths rang...

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