滩坝砂特低渗透油藏CO2驱油技术及应用

Technology and application of CO2 flooding in ultra-low permeability beach-bar sand reservoir

针对滩坝砂特低渗透油藏CO2驱面临混相难、波及系数低等问题,综合运用地质学、渗流力学和油藏工程等理论和方法,采用物理模拟和数学模拟相结合的手段,制定了CO2驱评价标准,明晰了CO2驱提高采收率机理,形成了CO2驱井网适配优化设计技术,优化了示范区高89-1块CO2驱技术政策界限。实践表明,技术应用效果良好,截至目前,CO2驱油与封存示范区累计注入CO22.8×10^5t,累计增油6.5×10^4t,封存CO2 2.6×10^5t。

To solve the problems of difficult miscibility and low sweep coefficient in CO2 flooding of ultra-low permeability beachbar sand reservoir, theories and methods such as geology, seepage mechanics and reservoir engineering and by the combined meth. ods of physical modeling and mathematical simulation are used to formulate the evaluation standard of CO2 flooding, clarify the EOR mechanism of CO2 flooding, form the optimum design technique adapted for the well pattern of CO2 flooding, and optimize the policy limitation of CO2 flooding in the demonstration zone Gao 89-1 block. It is indicated that the technology has been applied ef. fectively. Up to now, over 2.8×10^5 t of CO2 have successfully been injected into the reservoir, and the cumulative oil increment is 6.5×10^4 t, and 2.6×10^5 t of CO2 have been stored in CO2 flooding and storage demonstration zone.