一种改进的油水相渗实验末端效应校正方法

An improved correction method for end-effect in oil-water relative permeability experiment

油水相对渗透率测试过程中,岩心出口端的末端效应影响岩心中流体饱和度的分布,对实验结果产生较大的影响。从末端效应形成机理出发,对南海珠江口盆地文昌A油田ZJ1-4M油组岩心油水相渗实验中末端效应进行了研究,提出了改进的相渗曲线校正方法,并据此对油藏早期相渗曲线的形态和饱和度端点进行了校正,提高了油水相渗曲线的精度,得到了更准确的驱油效率。通过开展文昌A油田ZJ1-4M油组岩心末端效应校正实验,并将校正后的油水相渗曲线应用于油藏数值模拟研究中,明确了末端效应对该油藏剩余油分布的影响,为油田开展调整挖潜奠定了基础。

In oil-water relative permeability experiments, the core end-effect influences fluid saturation distribution in the cores and the experimental results. Based on the formation mechanism of end-effect, the end-effect in oil-water relative permeability experiments of Wenchang A oilfield in Pearl River Mouth basin is studied and a new method to correct oil-water relative permeability curve is put forward, based on which the relative permeability curve shape and end-point saturation are improved, thus enhancing the precision of oil-water relative permeability curve and getting a more accurate oil displacement efficiency. By applying the corrected oil-water relative permeability curve of Wenchang A oilfield on the reservoir numerical simulation, the effect of end-effect on the residual oil is clarified, which can provide a foundation for the oilfield adjustment.