Measures to Bring More Difficult -to -recover Re-serves Into Production

The major blocks in Henan oilfield have entered late development stage with high water-cut and severely in-sufficient back-up resources are the bottlenecks that re-strict oilfield development.Large efforts were put on e-valuation and production of difficult-to-recovery reserves during the″Ninth Five Year Plan″.Through comprehen-sive geologic study,deployment of highly deviated direc-tional wells and cold production of heavy oil,4.37mil-lion tons difficult-to -recover reserves were brought into production and633,000tons of recoverable reserves were added.Measures to bring more difficult-to-recover re-serves into production are presented taking Zhuangdian and Xinzhuang oilfields as examples in this paper.