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在试井解释中,通常把压力与时间的对数曲线的斜率定义为导数。本文将一种新的判别方法叫做一阶压力导数(PPD),它是直角坐标中压力—时间关系曲线的斜率。作者假定,当一口井关井进行压力恢复试井时,压力会单调地上升,直到最后稳定为止。这就意味着 PPD 是一个连续下降的函数,直到井内压力完全恢复,导数为零。但是与井筒有关的现象可引起所测压力升高或降低,而与油藏的影响无关。试井分析的第一组函数中,有一个函数是区分井筒控制作用和油藏流体流动影响的函数,PPD是一种非常简单的识别工具,它强调非油藏作用产生的影响,因此,可以避免试井解释中的失误。
In well test interpretation, the slope of the logarithmic curve of pressure versus time is usually defined as the derivative. In this paper, a new discriminant method is called the first order pressure derivative (PPD), which is the slope of the pressure-time curve in Cartesian coordinates. The authors hypothesize that when a well is shut in for a stress-recovery well test, the pressure rises monotonically until it stabilizes. This means PPD is a continuous descending function until pressure in the well is fully recovered and the derivative is zero. However, the phenomena associated with the wellbore can cause the measured pressure to increase or decrease irrespective of reservoir effects. One of the first set of functions in the well test analysis is a function that differentiates between wellbore control effects and reservoir fluid flow effects. PPD is a very simple identification tool that emphasizes the effects of non-reservoir effects and therefore Avoid mistakes in well test interpretation.