注入水水质对储层渗流物性影响实验研究

Lab research on effect of injected water quality on reservoir flow properties

注水开发是世界大多数油藏的主要开发方式,而不合格的注入水水质对储层渗流物性及油藏注水开发动态都会产生重要影响。根据水质对储层渗流物性影响实验研究新理论———水质适应程度系数法,开展了大量的实验研究并获得了注入水水质对储层渗流物性影响的普遍规律。实验结果表明:岩心渗透率的降低是悬浮颗粒浓度与粒径中值共同作用的结果,对不同渗透率岩心,其伤害程度是不同的;实验还确定出临界水质适应程度系数为0.667,大于该值岩心渗透率保留率都较高,小于该值岩心渗透率保留率都急剧下降。实验研究方法与结果具有广泛的适应性和实用性。

Water flooding is the major development method in most reservoirs around the world,but unqualified injected water can affect not only reservoir flow properties but also reservoir water flooding performance.Based on new theory of lab research on effect of water quality on reservoir flow properties-water quality adaptation degree coefficient method,lab research has been carried out and universal rules of impact of injected water quality on reservoir flow properties.Test result shows that decrease of core permeability is the joint effect of suspended particles concentration and particle diameter mid-value,and that damage degrees vary with variance of core permeability;The test also has determined critical water quality adaptation degree coefficient as 0.667. Core permeability retention rate is high when above this value,while decreases rapidly when below this value.The research method and result has wide adaptability and practicability.