永宁双河东区剩余油研究方法及分布类型

摘要

永宁双河油田是一个特低渗的岩性油藏，具有层内和层间非均质性较强的特征。其沉积环境造成了岩性油藏内部岩性变化的复杂性，直接控制和影响着地下油水运动的规律。永宁双河东区延长组油藏储量动用程度不均均，区内井距不均匀，注采井网不完善，注采不易调控，造成可采储量损失大，加之采用混注，较少分注，纵向上各层吸水不均，油井措施效果变差，水淹关井井数增多，油田开效果相对变差，区内仍存在部分剩余油未被开采。对剩余油分布技术的研究大致分为：地质分析法、动态分析法、油藏工程法等以及各学科相结合的方法。论文总结出井网不规则井距不均匀造成剩余油区、注采系统不完善造成的剩余油区、平面水窜造成的剩余油区等几种剩余油分布的类型，对于指导油田进一步挖潜及提高采收率均具有重要意义。%Yongning Shuanghe oilfield is extra-low permeability reservoir and lithological pool,it’s heterogeneity is strong in inner layer and interlayer.Sedimentary environment has caused the complexity of the lithology changes in lithology reservoir that direct control and influence of the law of oil and water movement. The producing degree of reserves in Shuanghe east area is inhomogeneous.Well spacing is irregular, production well pattern is imperfect.injection and production well net is not perfect injection and production is not easy to control. Because of the poor condition, the production well pattern is not perfect and the loss of reserves is large.In addition to the use of mixed injection, less separate layer injection, there are still some remaining oil has not been exploited.The study of the distribution of the remaining oil is generally divided into:geological analysis, dynamic analysis, reservoir engineering, and so on.The paper summarizes types forremaining oil of the well pattern of irregular spacing, injection production system is not perfect. It improve oil recovery guidance has important practical significance.