非稳态法水驱气相对渗透率曲线实验

水驱气相对渗透率曲线在带边、底状气藏开发动态分析和数据模拟中是一项不可缺少的参数资料，该曲线通常用气藏的真实岩心在实验室中用稳定法测试而获得，比较费时。为此，根据地下水动力学原理推导了利用实验测定数据计算水驱气相对渗透率的公式，并设计了一套回压装置进行非稳态水驱气相对渗透率测这的新方法，用某气藏的真实岩心在该装置上进行水驱气相渗透率曲线的测定，其结果和用稳定法测定的结果比较吻合，证明了所建立的非稳定法测试装置和计算公式是可行的，突破了水驱气相对渗透率曲线只能用稳定法的传统方法，使气水相对渗透率的测定具有快速、准确的特点。

AN EXPERIMENTAL STUDY ON RELATIVE PERMEABILITY CURVE FOR UNSTEADY-STATE GAS DISPLACEMENT BY WATER

For performance analysis and data match of gas reservoirs with edge or/and bottom aquifers, water/gas relative permeability curve is one of the necessary data. To figure out these curves in a time saving way, this paper derived equations to calculate relative permeability of water displacing gas by experimental data, and also designed a set of back pressure equipment to measure relative permeability of water displacing gas under unsteady state conditions. Proved by application of this equipment on real cores, the results matched those measured under steady state conditions very well.