无因次注入-采出曲线方法的改进及应用

Improvement and Application of Dimensionless Injection-Production Curve Method

无因次注入-采出曲线将注采关系与采收率联系起来,具有较好的应用前景,但预测采收率值一般偏大,且改正后的方法仅适用于注采平衡的稳定开发末期油田.通过引入阶段注采比对无因次注入-采出曲线进行改进并进行现场应用,与常规采收率预测方法和目前的无因次注入-采出曲线预测方法进行对比发现:注入-采出曲线是在一定注采规律下得到的,注采比在注入-采出曲线采收率预测过程中的影响不可忽视,改进后的方法适用于注采不平衡油田的采收率预测,对油田开发后期注采系统评价具有较好的指导意义.

Dimensionless injection-production curve links injection-production relationship with recovery factor,which has a good application prospect, but the predicted recovery factor is generally higher than the actual value, and the corrected method is only applicable to stable development of late oil fields with injection-production balance. By introducing phase injection-production ratio, dimensionless injection-production curve was improved and applied in the field. Compared with conventional recovery prediction method and current dimensionless injection-production curve prediction method, it was found that: the injection-production curve is obtained under certain injection-production law;the influence of injection-production ratio on recovery prediction of injection-production curve cannot be neglected. The improved method is suitable for recovery prediction of injection-production unbalanced oilfields, and has a good guiding significance for evaluation of injection-production system in later stage of oilfield development.