CO2注入方式对芳48油藏开发效果的影响
Xinjiang Petroleum Geology(2006)
Abstract
大庆油田芳48断块为特低渗透油藏,对该油藏进行了水驱、CO2驱、CO2吞吐、CO2转水驱、水驱转CO2驱等开采方式室内物理模拟研究.实验结果表明,该区块水驱见水早、含水率上升快、注水能力低.在上述5种气驱方式中,CO2吞吐后气驱的累积采收率最高,然后依次为水驱转CO2驱、气驱、CO2驱转水驱,CO2吞吐的累积采收率最低.从累积气油比来看,CO2吞吐累积气油比最高,其次为CO2驱,而水驱转气驱、气驱转水驱、吞吐转气驱的累积气油比较低.从气体注入能力来看,气驱的注入能力最高,而水驱转气驱、气驱转水驱的注入能力比较低.考虑开采效果和气体注入能力,芳48特低渗透油藏开采应优先选择CO2吞吐后气驱,其次为水驱转CO2驱.
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Key words
recovery process,Daqing oilfield,CO2,development scheme,low permeability reservoir,physical modeling
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