南堡2号构造中深层油水相渗曲线分析及应用

Oil-water relative permeability curve analysis of middeep layers and its application in Nanpu 2 structure

针对南堡2号构造中深层高含水、低采出程度的问题,根据归一化油水相对渗透率曲线揭示了油水两相渗流特征,并利用相对渗透率曲线法进行了含水上升和产量递减规律研究,得出南堡2号构造中深层注水开发的基本生产特征。结果表明:南堡2号构造中深层的水相相对渗透率曲线呈下凹型,随含水饱和度的增加,水相相对渗透率的增幅变缓;进入中高含水期排液会比较困难,提液潜力较小;采出程度与含水率关系曲线属于凸型,理论曲线与实际数据吻合较差;开发应有效提高高含水期采出程度;在确定产液速度的条件下,含水上升率和递减率的变化规律一致。

Aiming at the problems of mid-deep layers of Nanpu2 structure,such as high water cut and low recovery degree,according to normalized oil-water relative permeability curve in theory,the oil-water two phase flow characteristics have been revealed.By using the method of relative permeability curves,the regularity study on water cut increase and production decrease has been carried out and the basic production characteristics of deep water injection development in Nanpu 2 structure have been analyzed.The study results indicate the deep water phase relative permeability curve presents down concave type,with the increase of water saturation,the increase of water relative permeability became gentle.The drainage is more difficult in high water-cut stage and the liquid-increasing potential is smaller.The relation curve between recovery degree and water cut belongs to convex type,and the theoretical curve is in poor accordance with the actual data.The development should effectively improve the high water-cut stage recovery degree.When the velocity of the fluid production is determined,the water cut rise regularity is in accordance with the decline rate.These study results are of good value and guiding significance for the effective development of mid-deep layers of Nanpu 2 structure in high water cut stage.