低矿化度水驱研究进展及展望

针对国外低矿化度水驱已运用于矿场实践而国内相关研究还未开展的现状，对低矿化度水驱机理 及其存在的问题进行了综述，并对低矿化度水驱的发展趋势作了展望。对于砂岩油藏，低矿化度水驱提高 采收率的机理主要为类碱驱、微粒运移以及多组分离子交换引起的储层润湿性改变；而对于碳酸盐岩油 藏，低矿化度水驱提高采收率的机理则主要是多组分离子交换引起的储层润湿性改变。原油性质、储层 性质、地层水及注入水性质、地层温度等因素均可以影响低矿化度水驱提高采收率的效果。目前低矿化度 水驱存在的问题主要包括提高采收率机理不清、低矿化度水源限制、油田储层适应性问题等。最后指出， 低矿化度水驱若与现有油田开发技术、煤层气生产技术、低渗透油田及高含水油田开发技术相结合，将会 是经济、环保、潜力巨大的提高采收率新技术。

Research advance and prospect of low salinity water flooding

Aiming at the current status that low salinity water flooding has been applied to pilot test abroad while in China there is little research,this paper analyzed the current research status and existing problems,and proposed prospects for low salinity water flooding.It is concluded that for sand reservoirs,the main mechanisms of low salinity water flooding are similar to alkaline flooding,fines migration and the wettability alteration caused by multi-component ion exchange,while for carbonate reservoirs,the mechanism of low salinity water flooding is wettability alteration caused by multi-component ion exchange.Crude oil properties,reservoir rock properties,formation and injected water salinity and reservoir temperature can all influence the effects of low salinity water flooding.The main problems lie in the unclear mechanisms,low salinity water source limitation and reservoir adaptability.Finally,it is pointed out that low salinity water flooding can be combined with current oilfield development techniques,coal bed methane production techniques,development techniques for low permeability oilfield and high water-cut oilfield,which will form new economical,environmental-friendly and great potential techniques for enhanced oil recovery.