东河CⅢ^1岩性段低渗透砂岩储层注水伤害实验研究

Study of water injection damage in low permeability sandstone reservoir of Donghe CⅢ^1 reservior

通过大量室内实验研究了东河CⅢ^1储层注水开发中的潜在伤害因素。实验结果表明，其潜在伤害因素较多、复杂。储层岩石表现出的弱速敏、中等偏强水敏的伤害特征；在清污混注过程中，注入水机械杂质粒径超标、粘土膨胀运移、无机盐结垢等因素是储层欠注的主要因素；1岩性段储层岩石表现出亲油性，克服毛管阻力所需的注水压力较高，也是储层欠注的关键因素。

On the basis of analysing the physical properties of low permeability sandstone reservoir in donghe CⅢ^1,we study the latency which could damage the reservoir. After the core flow test we found that： The main reasons that injection well in Donghe fail to injection allocation not only including the reservoir physical propertes but also including the damage characteristic of weak velocity sensitivity, moderate water sensitivity , the overproof injected particles size and inorganic salt scaling. Adopting the water which match the reservoir and rigid water injection working system could prevent the underinjeetion in donghe injection well and guarantee the stable development of donghe oil field.