用毛细管压力曲线计算相对渗透率曲线的方法综述

A Review of Methods to Calculate Relative Permeability Curve by Using Capillary Pressure Curve

相对渗透率曲线对研究地下流体的渗流规律及驱替特征具有重要的意义。利用毛细管压力与饱和度的关系来计算相渗曲线的方法进行了综述。叙述了相渗曲线的计算原理,及引入分形理论的原理。按照公式相似性及继承关系,分组介绍了毛细管压力法的研究历程,及主要研究成果。认为提出Kr-S关系来简化算法和分形理论的引入,推动毛细管压力法的发展;认为各方法没有优劣之分,只是适应性不同;利用特定的实验数据,对各方法的优劣进行评价,本身有一定的局限性。据此将毛细管压力法分为三个时期。通过对比评价各方法的特点及相互关系,阐释算法发展规律。最后提出毛细管压力将有三个主要发展方向:1测定非常规储层的相对渗透率曲线;2测定特殊流体的相对渗透率曲线;3与其他岩心检测手段相结合来检测岩心。希望对今后的研究起到参考的作用。

The relative permeability is important for researching seepage fluid mechanics and driving character-istics. The emphasis of this review is methods to calculate relative permeability curves by using the relationship be-tween capillary pressure and saturation. The pressure-saturation relationship and fractal theory are considered as a key technology to push the development of the methods. According to the introduction of the fractal theory, the methods were divided into two categories. The principle to calculate relative permeability curve and the principle of fractal theory were described. The research history and current situation of methods to calculate relative permeabili-ty by using capillary pressure were introduced, which includes the main outcomes of the researchers. Finally, three main directions of the capillary pressure had been pointed out：①determination of the relative permeability curves to unconventional reservoirs;② the determination of relative permeability curves to special fluids; ③ the combi-ning application with other core test methods.