高含水期油田新型水驱特征曲线的推导及应用

Derivation and application of new water flooding characteristic curve
in high water-cut oilfield

范海军¹ 朱学谦²

中国石油大学（华东）石油工程学院，山东 青岛 266580 中国石化石油勘探开发研究院，北京 100083

注水开发油田高含水和特高含水期由于油水相对渗透率比值与含水饱和度关系曲线在半对数坐标中偏离直线关系，从而导致水驱特征曲线上翘。为此，文中将含水饱和度归一化，提出了一种新的油水相对渗透率比关系曲线，实现了中晚期段相渗曲线的充分拟合，能反映真实的相渗规律并适用于不同的含水阶段。利用这一新型关系曲线，根据一维油水两相稳定渗流理论推导出了一种水油比与采出程度之比（WOR/R）型的新型水驱特征曲线，可以预测高含水及特高含水期油田的最终采收率。实例计算结果表明，新型水驱特征曲线计算简便，具有较高的可靠性，避免了高含水和特高含水期由于水驱特征曲线的上翘而导致的可采储量预测偏差。

The deviation of water flooding characteristic curve from straight line in high water cut period due to the abrupt variation of relative permeability ratio has been commonly recognized in recent years. In this paper, a new relative permeability ratio relation is presented based on normalized water saturation, which can reflect the nature of two phase flow and is suitable to the different water cut stages. Based on this new relative permeability ratio model, a new WOR/R type water flooding characteristic curve is derived to predict the oil recovery of oil field in high or extreme high water-cut period. The applications of this new water drive characteristic curve in oil field cases have demonstrated its simplicity and reliability, and the "bending upwards" phenomenon has been completely avoided.

10.6056/dkyqt201601023