特征方程在早期产能估算中的应用

Application of characteristic equations at early age of deliverability estimating

曾鸣 傅绍斌 刘波

长江大学石油工程学院，湖北 荆州 434023

School of PetroleumEngineering, Yangtze University, Jingzhou 434023, China

在裂缝性油藏开发早期，地饱压差大，流体从地层流入井底为高速渗流，在井底附近出现非达西流，此时流体渗流特征不符合达西定律且变得比较复杂。应用特征方程来描述流体的流态，对目前测试数据确定的指示方程进行归类分析，确定适合油田的产能评价方法，应用图解法及多元回归法确定系数，进而确定油井单井产能方程。文中以青西油田为例，介绍了该方法在早期产能估算中的应用。

In the early development of fractured reservoir,the difference between reservoir pressure and saturation pressure is very great. The fluid flows fast from the reservoir to the well and non-Darcy flow takes place near the bottom of the well. At this time,the infiltrating fluid features do not accord with Darcy law and become more complex. Using the relevant characteristic equations to describe the behavior of the fluid,the indicating equations which are established on the early test data are analyzed and classified to build proper productivity evaluation method. Graphical method and multiple regression method are used to define the factors and
the productivity equations of single well are established. Taking Qingxi Oilfield as an example,this paper introduces the application of characteristic equations at the early age of deliverability estimating.