The Distribution of Remaining Oil and Development Design in Upper Sha No.2 in the East Pucheng Field

Ten years ago, the production on upper Sha no.2 in the East Pucheng Field has been into a comprehensive treatment stage. Now the contained water of the field has been upto 95.8%. The geological productive rate and industrial productive rate are 26.1% and 84.6% respectively. All the recovered reserves have been utilized. The productive ratio of oil/water is 0.36. The increase of the productive cost decreases economic efficiency. The study on distribution of remaining oil shows that the integral layer reservoir in a same structural trap and with same bottom water has been cut into scattered reservoir by continuously injected water. Based on this conclusion, in order to increase production rate and economic efficiency, it is necessary to use different development modes for different reservoir blocks in the late productive stage on remaining oil.