段塞流压力诊断曲线特征点分析新方法

CHARACTERISTIC POINT ANALYSIS TECHNIQUE USING THE PRESSURE IDENTIFICATION CURVE OF SLUG FLOW

本文从一个新的角度探讨了段塞测试的资料解释，并提出了直接根据段塞流压力诊断曲线特征点计算地层参数的分析方法。此法克服了典型曲线拟合法的不唯一性，既可用于识别流动期和油藏类型，又可直接选择材征点。段塞流压力诊断曲线因不需计算导数，应比常产量试井导数曲线光滑，容易选准特征点。故特别适用于低压、低渗透储层早期投塞流压力分析，也可推广到压裂井、双重介质油藏段塞测试中去。此法具有简单、方便、快速、准确的优点，实例应用表明新方法是正确的。

This paper discusses the well test interpretation method of slug flow from a new angle, and presents a method for calculating the formation perameters using the characteristic point in the pressure identification curve of slug flow. The new methed overcomes the non-unique of type curve matching. Itcan be used not only to identify the flow period and reservoir type, but also to select the characteric point directly. Not having to calculate the derivative, the pressure identification curve of slug flow is more smooth than the pressure derivative of constant preduction rate, and the characteric point is easier to be selected correctly. Therefore, it is specially suitable for the pressure analysis of early slug flow in the low-pressure and/or tight reservoir, and can be used in slug test of the fractured well and dualporosity reservoir. The most important aspects of new method are simplicity, convenience, high-speed and accuracy. The field applications indicate that the new method is correct