The Reutilization of Production Layers at Late Development Stage of Oilfield

The residual oil potentials mainly distribute in litho-logic intervals in and/or between flow units at late develop-ment stage with high water-cut and these intervals have the characteristics of″thin,scattered,small,poor and low″.Re-utilization of production layers can be carried out when the residual oil potentials near wellbores can not be economi-cally and effectively recovered with conventional measures such as supplementary perforation,fracturing,acidization and water plugging.Taking Shuanghe oilfield as an exam-ple,this paper discusses the necessity of reutilization of production layers at late development stage.The ways of reutilization include releasing of mechanically plugged lay-ers,unplugging and re-perforation of plugged water layers and selective perforation of large plugged intervals.