低渗透水敏性油藏注入水配伍工艺研究及应用

Research and application of matching technology for water injection in low permeability and water-sensitive reservoir

结合注水配伍工艺在江苏油田的应用实例 ,说明注入水配伍对于低渗、中———强水敏油藏储层保护、高效注水尤为重要。注入水配伍工艺的研究方法是确定注入水源、确定预处理工艺、确定地层受到伤害后的处理、确定三防、精细过滤等配套措施。尽量做到污水回注或清污混注 ;防膨应做为一项常规措施 ,普遍实施 ;对低渗高强或极强水敏地层应采取酸化预处理工艺增大孔道半径 ,降低粘土的膨胀性稳定地层 ,减少颗粒运移。

On the basis of application of water injection matching technology in Jiangsu Oilfield,the results show the water injection matching technology is very important to protect low permeability and middle/strong water-sensitive reservoir.The research method of water injection matching technology is to determinate injection water source,pretreatment technology and matching measures of fine filtering etc.Antiexpansion must be as a regular measure.To low Permeability and strong water-sensitive formation should adopt acidizing pretreatment technology to increase pore throat radius,reduce the expansivity of clay,stabilize formation and decrease grain migration.