利用Origin软件求解油水相对渗透率

对于水驱开发油藏来说,油水相对渗透率是一项重要的基础数据,通常通过非稳态法驱替岩心实验来测定、计算。针对在采用非稳态法计算相对油水渗透率时,需要涉及大量的数据处理和繁多的求解模型以及函数拟合非单调性等问题,利用Origin软件处理油水相对渗透率实验数据,并通过求导计算、函数拟合等方法绘制出相渗曲线。给出了实际的计算过程,并进行了计算实例验证。结果表明:采用Origin软件计算并绘制的油水相对渗透率曲线与采用VBA编程等方法的计算结果较为一致,具有很好的线性相关性和实用性;该方法适应性强,对油水相对渗透率求导代入计算、拟合函数以及其他JBN扩展公式的矩阵算法都能实现;可有效降低人为试凑拟合函数的不准确性,减少人工计算处理误差,计算效率和计算精度高;该方法简便易学,无需编程,便于推广。

Calculating Oil-water Relative Permeability of the Cores Using Origin Software

Oil-water relative permeability is an important fundamental data for the water drive reservoirs.The unstable-state core-flooding experiment is usually conducted to obtain the relative permeability data,but a great deal of data needs to process and various complex models need to compute and the weakness of non- monotonous property of function-fitting appears.In order to solve these problems ,Origin software is applied to processing the experiment data of the oil-water relative permeability and differentiation calculation and func- tion-fitting and some other methods are used to map the relative permeability curve.Actual computing process is given and it is proved by the case.Some contrast examples show that the relative permeability and the relative permeability curve can be quickly and exactly computed and drew by using the Origin software and VBA programming.They have good linear correlation and practicability.This method is flexible for the differen- tiation calculation and function-fitting and matrix algorithms of JBN empirical formula of the relative perme- ability.It can reduce the inaccuracy of the artificial test by trial of the function-fitting and error of the arti- ficial calculation.Without programming,this method is easy to use and may improve the efficiency of comput- ing.So it may be used widely.