丙型水驱曲线直线段出现时间的预测方法

Feng TIAN,Xiaokang DU,Xiaodong WANG,Weiwei XIE, Dehua WU

Petroleum Geology & Oilfield Development in Daqing（2018）

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Abstract

稳定直线段的出现是水驱特征曲线正确运用的基础.对丙型水驱曲线拓展推导,得到反映油水渗流特征的Sw-fw关系,再进行坐标变换,进而得到二次方Sw—(1-fw)1/2关系式.基于该关系式对实际油水相对渗透率数据进行分析,Sw随(1-fw)1/2的增大,呈现出先缓慢后急剧上凸减小的趋势.当急剧上凸出现时,实际数据不再符合二次多项式,该点即为直线段出现的端点.数模验证与实例应用表明该方法可以较准确地对丙型水驱曲线的直线段出现时间进行预测.

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Key words

Type-C water drive curve,water saturation,water cut,oil-water relative permeability,linear segment

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