基于压力波动的周期注水效果评价方法及应用

Cyclic Water Injection Evaluation and Application Based on Pressure Fluctuation

目标区块属于典型的碳酸盐岩油藏,在注水开发过程中尝试运用周期注水技术改善生产井含水率上升快、注入水利用率低等问题。为评价周期注水实施效果,并对周期注水进行优化,基于周期注水原理,建立了平面上周期注水压力波动方程,形成了压力波动的评价方法,并运用这项压力波动评价方法对周期注水实施效果进行评价。运用该方法诊断周期注水井组在实施过程中效果“时好时差”的现象,进一步形成了实践性强的周期注水实时监控与优化调整技术。在目标区块现场运用,取得了较好的稳油控水效果,周期注水技术在区块实现了推广应用。并且该方法还适用于其他多种类型油藏,具有较强的推广应用价值。

The target block is a typical carbonate reservoir,in the process of water flooding development,cyclic water injection is used to solve problems of rapid increase of water cut and low utilization ratio of injected water.In order to evaluate the implementation effect of cyclic injection and optimize cyclic injection parameters,a pressure fluctuation equation of cyclic injection is established based on the principle of cyclic injection,and an evaluation method of pressure fluctuation is formed,which is used to evaluate the implementation effect of cyclic injection.This method can be used to diagnose the unpredictable effect in cyclic injection well group,and further forms a practical real-time monitoring and optimization adjustment method of cyclic injection.Being applied to target oil fields,the new method has achieved good effects of oil stabilization and water cut control,and has been popularized in this oil field.This method can also be applied to other types of reservoirs,and has a good prospect of application and extension.