水性变化在油藏开发中的应用研究

Application of Water Property Changes in Reservoir Development

油藏含水上升影响油田开发效果,可应用水性变化研究辅助分析含水上升原因。研究表明,在天然能量开发阶段水性的突变,主要是由非生产层段地层水进入井筒引起的,可以此判断井下管柱技术状况;在二次采油即注水开发阶段利用其矿化度的变化可判断边水侵入还是注入水推进,并预测水淹程度;在油藏"二三结合"开发阶段可以利用其氯离子的变化判断是否有新层启动,分析动用程度是否得到提高。

Water-cut rising in reservoirs affected the effect of oilfield development,the reason could be analyzed by studying the water property changes.The study showed that the mutation water property in natural energy development period was mainly induced by water coming into wellbore of non-production interval,by which the condition of casing string setting could be judged.In secondary oil recovery,that was in the period of water-flooding development, the salinity changes could be used to judge if it was edge water immersion or coning of injected water and as well as prediction of water-out degree.At the stage of combining secondary oil recovery with tertiary oil recovery,the change ofchloride ion can be used to judge whether there is a new stratum produced,analyze if the producing altitude is improved.