凝析油气相渗函数分析评价

实验证明低界面张力的凝析油气体系相对渗透率受界面张力、速度、粘滞力的影响,它与饱和度的关系不能只进行界面张力校正。目前国外提出的改进相渗函数方法很多,总结了现有的函数,对它们进行结构分析并评价了两大类方法各自的优缺点。用阻尼非线性最小二乘拟合法结合实验数据,对诸方法进行了总体拟合效果评价和预测效果评价,推荐出目前最好的方法。指出函数存在的问题和解决问题的方向。

ANALYSIS AND ASSESSMENT OF GAS CONDENSATE RELATIVE PERMIABILITY FUNCTIONS

It is experimentally proved that gas condensate permeability is affected by interfacial tension, velocity, viscosity, thus the relationship between permeability and saturation can not be corrected by the function simply depending on IFT. A large number of methods have been proposed for including the capillary number in the gas condensate permeability functions. Two different methods are reviewed and analyzed, these methods evalu-ated by using a least-squares fitting method to fit the correlations to one set of data measured at varying interfacial tension and flow velocity, the best function recommended and the direction of further study pointed out.