摘要
防止气窜是提高超低渗裂缝性油藏注CO2开发效果的关键因素,气窜发生的根本原因是注入井井底压力超过裂缝重张压力导致裂缝开启。通过分析井筒传热过程,利用传热学理论等理论,建立注CO2井筒温度压力耦合模型,对注入参数进行合理优化,保证注入井井底压力低于裂缝重张压力;同时室内采用Waring-Blender法,优选合适的起泡剂体系,优化气液比等参数,对重张裂缝进行封堵,有效控制了气窜,保证了红河油田注CO2提高采收率的开发效果,对应油井在注CO2后含水率下降明显,日均产油由注CO2前的1.5t/d增加到2.4t/d。
Gas channeling prevention is the key factor for improving CO 2 -injection-aided development effect of frac‐tured reservoir with ultra -low permeability .The root cause of gas channeling is that the crack will open when bot‐tom hole pressure of injection well surpasses its re -open pressure .Through analyzing shaft heat transfer process , establishing coupling model of CO 2 injected shaft temperature pressure and optimizing injection parameter ,its bottom hole pressure is guaranteed to be under crack re -open pressure .In addition ,indoor measures are taken such as u‐sing Waring -Blender method ,selecting suitable foaming system ,improving gas liquid ratio and other parameters and plugging re-open cracks .All this controls gas channeling and ensures increase of CO 2 -injection-aided oil re‐covery in Honghe Oilfield .
出处
《江汉石油职工大学学报》
2015年第2期19-22,共4页
Journal of Jianghan Petroleum University of Staff and Workers
基金
中国石化科技部项目"改善鄂南致密油藏水平井开发效果工艺研究"(P13090)资助
关键词
超低渗裂缝性油藏
注CO2
气窜
注入参数
Fractured Reservoir with Ultra-- Low Permeability
CO2 Injection
Gas Channeling
Injection Parameter
