有限多井系统试井模型及样板曲线分析

Well Testing Model for Finite Multi-Well System and Type Curve Analysis

对有限多井系统进行了研究,以两口井为例(测试井考虑储存系数)进行了分析、讨论。应用在拉氏空间叠加的新方法,推导出了模型的拉氏空间解。这种方法方便、实用,且很容易推广到受多口邻井影响的情况。绘制了样板曲线,并结合矿场实例分析了各种因素对测试井的影响(邻井的距离、产量等)。结果表明,在油田开发的中后期油井大多会受到邻井的影响,表现出诸如压力导数曲线下掉等边界反映的特征,使用多井系统模型进行解释可在很大程度上排除这些干扰,提高试井资料的利用率和使用效果。

Study of finite multi-well system is made by taking two wells an example. A new method for pressure superposition of Laplace transformation is applied to deduce the Laplace＇s solution of well testing model for finite multi-well system. The convenient and practical method can be easily extended to the conditions of many adjacent wells. This paper draws the type curves and analyzes influences of various factors such as distance and production from adjacent wells on the two testing wells. The results show that most wells wouht be influenced by adjacent wells in the subordinate phase of production characterized by the dropping of differential of pressure curve similar to that of boundary reflection. Using this well testing model for interpretation could exclude these interferences to a large extent and improve the utilization and effect of well testing data.