Abstract
Daqing Oil Field is the largest oil field in China and one of the largest oil fields in the world. Development began 35 years ago. By cyclic identification and comparison of continental heterogeneous sandstones, studies on sedimentation models and sand body types, a better understanding of the development stage, water flood characteristics and residual oil distribution of different types of sandstones was obtained. A whole set of technologies (including geology, reservoir engineering, drilling, production, open hole logging and production logging) were developed to increase the recoverable reserves of different zones. As a result, at each stage of development the recoverable reserves of the oil field were increased. It is estimated that after drilling the third round of infill wells and after polymer flooding, the recoverable reserves will be 118 to 133% higher than 1978. Daqing was brought on production in 1960. The present water cut is around 80%. Production reached 50 × 106t in 1976 and in 1995 reached a record high of 56 × 106. Production has been stable for 20 years and is estimated to be stable for another long period of time. Excellent development results have been obtained and are better than planned.
