针对特高含水期砂岩油藏,利用Volume of Fluid(VOF)可以追踪相界面动态变化、再现微观渗流物理过程的优势,研究了驱替压力梯度对剩余油微观赋存状态和水驱采收率的影响.通过分析微观孔隙结构内的渗流特征和剩余油赋存状态,揭示了驱替压力梯度对水驱采收率的影响规律:驱替压力梯度增大能突破小喉道毛管力,形成新的渗流通道,进而增大水驱采出程度;原油黏度和润湿性会对不同压力梯度下采出程度产生影响.
Study on Influence of Displacement Pressure Gradient on Water Flooding Oil Recovery
For sandstone reservoirs with extremely high water content,the Volume of Fluid(VOF)method is able to trace the dynamic changes of multiphase interface and reproduce the physical process of microscopic seepage.The influence of different displacement pressure gradients on the microscopic occurrence characteristics of remaining oil and water flooding recovery is studied.The influence of displacement pressure gradient on water flooding recovery is revealed by analyzing the seepage characteristics and remaining oil occurrence state in microscopic pore structure.The increase of displacement pressure gradient can break through capillary force of small throat,form a new seepage channel,and increase the water flooding recovery.The viscosity and wettability of crude oil affect the recovery degree under different pressure gradients.
super high waterwaterflood recoveryremaining oilvolume of fluid methoddisplacement pressure gradient
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