双重介质压力恢复曲线研究及其应用(二)

双重介质压力恢复曲线形态的特征是由孔隙结构和流动条件的复杂性决定的。半对数坐标系中一条完整的双重介质压力恢复曲线大致可以分成五个部分:续流段、早期直线段、过渡段、晚期直线段、边界反映段(图1)。早期直线段和晚期直线段互相平行,根据其斜率可以求得裂缝流动系数。

STUDY AND APPLICATION OF PRESSURE BUILD-UP CURVES IN MEDIA WITH DOUBLEPOROSITY

Due to the complexity of pore structures and conditions of fluid mobility in media with doubleporosity, it is rather difficult to interpret the formation parameters by means of the slope of the straight-line section of the pressure built-up curves. Based on the study of the mathematical solution of the Balenbrat Equation, the authors have worked out a set of charts of dimensionless pressure build-up curves that may be used in the interpretation of coefficient of fluid "channeling", ratio of coefficient of elastic porous volumes, mobility coefficient of fractures as well as parameters for hydrocarbons reserve etc. Explanations have been given in the paper regarding the making and application of the charts. Examples of the application of the charts in the oil fields at Yihezhuang, Kenli, Binsiqu, Jenqiu and Sichuan are included in the appendices to the paper.