低渗凝析气藏油气相渗曲线校正方法及其应用

常规油气相对渗透率的测试是在常温、低压下进行的，界面张力高（约30 mN/m），而具有低界面张力（是常规界面张力的几百分之一）的真实地层高温高压平衡油气相渗测试的过程耗时长，并且非常复杂。为此，通过调研找到一种相对渗透率曲线校正的经验公式，并将其应用到常规相对渗透率曲线的校正中，以使常规油气相渗更接近渗流实际。首次将Henderson的方法应用于国内凝析气田的实际应用中，用QK低渗凝析气藏的平衡油气相对渗透率曲线与常规油气相对渗透率曲线进行了比较，取得相关校正参数，将得到的校正公式应用到FS凝析气田中，对其常规相对渗透率曲线进行校正，其校正结果与单井动态历史拟合所得的油气相对渗透率曲线较为一致，表明该方法可应用于其他类似凝析气田的相对渗透率曲线的校正。

Research and Application of Correction Method for Oil/Gas Relative-perme-ability Curve in Low-permeability Condensate Reservoirs

The conventional oil/gas relative-permeability test was carried out within a condition of high interfacial tension (about 30mN/m) and normal temperature as well as low pressure. While the in-situ high-pressure high-temperature balance permeability test with lower interfacial tension (only several hundredth of conventional interfacial tension) is very complicated and needs longer time. Investigation has been conducted to set up an empirical formula for correction of the oil/gas relative-permeability curve and try to use the formula for correction of conventional relative-permeability curves to minimize the error between the conventional relative permeability and the actual permeability values. the Henderson Method has been used in analysis of domestic condensate reservoir for the first time. Through comparison of QK balanced oil/gas relative-permeability curve for low-permeability condensate reservoir and the conventional oil-gas relative-permeability curve,the correction parameter has been obtained. By applying the correction formula to FS condensate reservoir,the correction results of the conventional relative-permeability condensate reservoir is similar to the relative-permeability curve obtained by dynamic historic fitting of the individual wells. This correction method has been proved to be feasible for correction of other relative-permeability curves for reservoirs in other similar gas condensate gas fields.