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生产时间短的压力恢复数据往往难以分析,尽管半对数曲线法即霍纳法可以使用,但对压降典型曲线却不能用,因此难以确定半对数曲线是否含有恰当的直线段。本文专门为生产时间短的压力恢复测试设计了一种新的双对数曲线,它可使分析工作者容易地确定流动的类型(线型、双线型或径向流动型),从而它可以用来确定确切的半对数直线段的存在。这种新曲线也可用来象半对数法类似的方式计算地层的渗透率或裂缝的传导率,文中给出了用以开发这种新技术的解析模型,该模型考虑了井筒贮集和表皮效应。用一个现场实例进行讨论,提出了这种新技术对生产时间短的压力恢复曲线的用法,并简要地与以前的方法进行了比较。
Pressure-recovery data with short production times are often difficult to analyze, and although semi-logarithmic curves, such as the Horner’s method, can be used, they can not be used for typical pressure drop curves, making it difficult to determine if a semi-logarithmic curve contains the appropriate straight-line segments. In this paper, a new double logarithmic curve has been designed specifically for pressure recovery testing with short production times, allowing analysts to easily determine the type of flow (linear, bilinear or radial flow) so that it can Used to determine the exact existence of a semi-logarithmic straight line segment. This new curve can also be used to calculate formation permeability or fracture conductivity in a manner similar to the semi-logarithm method. An analytical model to develop this new technique is presented in this paper, which takes into account wellbore storage and skin effect. A field example was used to discuss the use of this new technique for short time pressure recovery curves and to compare briefly with previous methods.