桩西高温深埋油藏分层注水井稳定注水技术的研究与应用

Research and Application of Steady Water Injection Technology for Stratified Water Injection Well in High Temperature and Deep Buried Reservoir in ZHUANGXI Oilfield

桩西采油厂桩66及桩104等区块属于高温低渗储层,水井以分层注水居多,这类储层的粘土矿物含量较高(8%左右)且粘土矿物中水敏性矿物伊蒙混层含量较高,存在水敏现象。水井常规酸化后虽能够解除近井地带污染,但无法消除因粘土膨胀造成的油层伤害,初期效果虽好,但注水压力上升快,有效期短。本文筛选了多种防膨剂,优选出了有机小阳离子聚季胺盐类防膨剂,并对现场参数进行了优化,现场应用取得较好效果。