摘要
通过公式推导与转换对比了JBN方法和Jones的图解法,得出二者本质的区别是选取的岩芯基准渗透率不同。同时认为,在相对渗透率曲线的计算中,束缚水下的油相渗透率对于两相的渗流能力更具有参照性,更适合作为岩芯的基准渗透率。在对平均含水饱和度和注入倍数的拟合中,对比了多项式、对数和指数函数。结果表明:对数函数和指数函数通过分段拟合后可以达到高拟合精度,并且计算出的含油率更为合理。同时提出了针对驱替数据特点的两段式分段拟合法。对于1/Qi～1/(IQi)拟合,不同的拟合函数计算出的油相相对渗透率较为接近,但水相相对渗透率差别很大。对比线性、多项式和乘幂函数拟合,乘幂函数拟合的计算结果最为合理。
JBN method is compared with Jones′ graphical technique by formula deriving and converting. It is concluded that the essential difference between the two methods is the different reference permeability of the rock. When calculating relative permeability,oil permeability at irreducible water saturation is a more suitable reference than the flowing ability of oil and water. The author made a comparison among Polynomial function,logarithmic function and exponential function when fitting average water saturation and total injection volume. The result shows that logarithmic function and exponential function have good fitting accuracy if piecewise fitting is carried out. Furthermore,oil ratio calculated by these two fitting function is more reasonable. We obtain similar oil relative permeability but quite different water relative permeability when using different functions to fit 1/Qi and 1/（IQi）. Linear function,polynomial function and power function are compared,and the result calculated by power function is more reasonable.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第6期110-116,共7页
Journal of Southwest Petroleum University(Science & Technology Edition)
关键词
相对渗透率
非稳态
函数拟合
数据处理
JBN法
relative permeability
unsteady state
function-fitting method
data processing
JBN method
