应用恒速压汞实验数据计算相对渗透率曲线

截取一段实际储层岩样 ,利用恒速压汞实验技术测定其孔喉频数分布 ,并拟合成连续分布函数 ,该函数符合伽马函数分布。对剩余岩样进行了油、水相对渗透率的测定。以所拟合的孔喉频数分布为主要输入参数 ,利用孔隙网络模型计算了油、水相对渗透率。计算结果与利用JBN法处理的实测结果对比表明 ,恒速压汞实验是确定岩石微观孔喉分布的一种非常有效的实验手段 ,可直接为孔隙网络模型提供主要的输入参数 ,能够得到反映微观孔隙结构特征的较合理的相对渗透率曲线 ,这对于用JBN法不满足或者处理结果不理想的实验具有重要的意义。

Determination of relative permeability curves using data measured with rate-controlled mercury penetration

Throat frequency distributions of a segment of rock sample were measured by using rate-controlled mercury penetration. Water-oil displacement experiments on the residual segment of core sample were conducted. The measured throat frequency distributions were correlated to gamma distribution functions. The throat frequency distributions were taken as the main input data and used to calculate oil-water relative permeability with the pore scale network model. The calculated data agreed well with the experimental results of JBN method. It shows that rate-controlled mercury penetration is a very efficient way for obtaining microscopic pore characteristics and throat distributions. This way can directly provide input data for constructing the pore scale network model, and the reasonable oil-water relative permeability curves can be obtained. This calculation method for oil-water relative permeability is more significant to the cases that JBN method is not applicable.