一种新的自动拟合试井解释法

A NEW AUTOMATICALLY MATCHING TECHNIQUE FOR WELL TESTING DATA INTERPRETATION

本文主要讨论改善自动拟合试井解释法——现代试井解释的一种重要方法的收敛性以及多解的问题。这些问题大大地妨碍了这种方法在实际油田中的应用。本文以均质油藏模型为基础,利用系统工程的观点,将压力曲线按其所表征的参数的敏感度不同分为两段。采用分段拟合的方法,用一种新的迭代过程,代替原有的拟合方法。理论分析和实际应用结果表明,这种方法提高了计算结果的收敛性,改善了解的唯一性,原则上这种思路可以推广到双重介质等复杂油藏模型的自动拟合试井解释中。

This paper discusses mainly the convergence and non-uni-queness of an improved automatically matching technique for well testing data interpretationan important interpretation technique in modern well testing. These problems give much trouble in the actual field application of this technique. Based on a homogeneous reservoir model, with the application of the method of system engineering, a pressure build-up curve can be divided into two sections according to the difference of sensitivity to the parameters charaterized by them. A new iterative process is used instead of the original one by means of a sectionally matching technique. Both results of theoretical analysis and actual application indicate that this technique will result in an improvement in the convergence and the uniqueness of the solutions. Principlly this idea can be generilized to the automatically matching techniques applied to the interpretation of the well testing data in case of more complicated reservoirs, such as reservoirs with double porosity etc.