沙河街组薄互层油藏控水稳油技术研究与实践

Study and practice of water control and oil stabilization strategy for thin interbed reservoir of Shahejie formation

针对A油田目前暴露出含水上升快,老井自然递减率增大的问题,采用油藏工程与数值模拟方法相结合,采用洛伦兹曲线对具有油田代表性的静态渗透率场进行差异表征,结合油田实际确定油田代表性的高、中、低三个级别的渗透率值并建立代表性机理模型,通过机理模型研究得到油井在不同含水阶段的稳油控水策略。研究得到结论是,油井高渗层含水为10%~40%时,通过全井提液(生产压差提高1.7倍)油井采收率最佳。目前该策略已在K油田部分井组实施,11口油井含水得到控制,日增油量达到310 m3,实施效果显著。该方法对相似油田开发具有一定的参考价值。

For A oilfield currently exposed water cut rising fast, old well increase natural decline rate, using reservoir engineering and numerical simulation method, the combination of using lorentz curve with static permeability oilfield representative field were differences,combining the reality of oilfield to determine oilfield representative of high, medium and low three levels of permeability value and establish the mechanism of representative models, the well is obtained by mechanism model research in different water cut stage of oil water control strategy. It is concluded that the best oil recovery is achieved through the whole well extract(1.7 times of production pressure difference) when the water content in the highpermeability layer of the oil well is 10 %~40 %. At present, this strategy has been implemented in some well groups of K oilfield, water cut of 11 oil wells has been controlled, daily oil increase has reached 310 cubic meters, and the implementation effect is significant. This method has certain reference value for similar oilfield development.