关键词: 采油指数, 饱和压力, 大庆油田, 大气压, 地层压力, 开采方式, 压力界限, 生产压差, 油水相对渗透率曲线, 注水井

Abstract: The necessity of a change of production method in the Daqing oil field is stressed at the present stage when oil is produced with high water cut. In view of the drop of hottcmhole flowing pressure to under the saturation pressure since the flowing wells in the field go on pumping, and after discussing the changing trend of productivity index when the flowing pressure falls under the saturation pressure, an emphirical method of prediction of the index is proposed. Supported with abundant data about the change of production method from flowing to pumping, the authors claim that the change can minimize inter-pay interferences, increase the thickness of oil drainage and curb the drop of productivity index. A method of analyzing the pressure limits of wells after put on pumping is proposed, and the result of change of production method in the entire field is examined.