泡沫欠平衡钻地热井井筒多相流特性研究  

Study on Characteristics of Multiphase Flow in Foam Underbalance Drilling Geothermal Well Wellbore

作　　者：曹献平[1] 旷曦域[1] 刘英波 李海旭[1] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]中国石油胜利石油管理局孤岛采油厂垦利油藏经营管理区,山东东营257231

出　　处：《天然气与石油》2013年第4期48-50,9,共3页Natural Gas and Oil

基　　金：西南石油大学青年科研创新团队"欠平衡钻井方向"基金(2012XJZT003)

摘　　要：针对泡沫钻超高温地热井井筒泡沫流体可能发生相态变化的情况,提出了地热井泡沫钻井井筒物性参数计算方法。基于泡沫相变判别模型,结合泡沫钻井理论模型和气体钻井理论模型,建立了适用于超高温地热钻井的高温泡沫相变耦合流动计算模型。通过数值计算,得到了井筒物性参数分布。计算结果表明,井筒是否相变取决于气液注入比和地层温度;同时,泡沫流体在高温下发生相变后,其物性参数均有较大突变,但在一定的注入气液比条件下仍能保证有效携岩。For phase-transition occurring probably in foam fluid from ultra-high temperature geothermal foam drilling wellbore,a calculation method is proposed for physical parameters of geothermal foam drilling wellbore.Based on phase-transition discrimination model,combined with foam drilling theoretical model and gas drilling theoretical model,a coupling flow calculation model of high temperature foam phase-transition is established for superhigh temperature geothermal well drilling.Wellbore physical parameters can be obtained through numerical calculation.The results show that wellbore phase transition depends on gas-liquid injection ratio and formation temperature.After phase transition occurs,its physical parameters will change dramatically,but effective cutting-carrying can be still ensured in certain injection conditions.

关 键 词：地热井 超高温 温度分布 理论模型 相变 

分 类 号：P634[天文地球—地质矿产勘探] TK529[天文地球—地质学]