化学调驱技术在高含水期复杂断块油藏中的应用

岔河集油田岔12断块东三段、沙一段油藏为中孔低渗常压高饱和压力非均质复杂断块油气藏,其断层发育、构造破碎,砂体横向分布稳定性差且分布范围较小,油层分布零散。目前油田开发已进入高含水期。为改善油田开发效果,在认清剩余油分布的基础上,立足于注水开发,油井措施逐渐由补孔为主转向提液、卡水为主,水井措施则由转注、完善补孔、分注为主转向重配、深度调驱为主。实施结果表明措施效果显著,对油田稳油控水、挖潜上产起到了重要的作用。这表明,对于象岔河集这样的复杂断块油田,在中高含水期,层间、层内剩余油分布极为零散的情况下,深度调驱技术是挖掘高含水主力大砂体剩余油极为有效的手段。

APPLICATION OF CHEMICAL PERMEABILITY ADJUSTING/OIL DISPLACING THECHNOLOGY IN COMPLICATED FAULT - BLOCK RESERVOIR IN HIGH WATER - BEARING STAGE

Cha 12 sector in Chaheji Fields is complicated fault-block reservoir with low permeability, mid pore, high saturation pressure, high heterogeneity. There are grown faultage, crashed conformation, un - stability and small area of sand distribution in landscape orientation. Now the field is at high water - cut stage. In order to improve the development effect, on the basis of seeing clearly the distribution of residual oil and based on water flooding development, the well measures are mainly to raising liquid gradually and wall up water but not re - perforated, and the injector are mainly to re ?assign injected water and chemical permeability adjusting/oil displacing in deep formation but not perfectly re ?perforated, multizone flow regulating. Implement result indicated that it has been remarkable effect. It plays an important role on effecting oil stabilization, blocking up water and tapping the potential oil. It indicates that chemical permeability adjusting/oil displacing technology in deep formation is effective at tapping the residual oil of the mam productive layer at high water ?cut stage when the residual oil is extremely separate at complicated fault block reservoir like Caheji fields.