确定压裂井到断层距离方法研究

在现代试井解释方法中,用试井分析确定井到断层距离,往往是通过近似镜像反映方法得到的。对于压裂井,特别是压裂井离断层较近或压裂裂缝较长时,双线性流持续时间久,还未结束时就出现边界反映,此时镜像反映法就不那样简单了,从精确镜像反映法中推导出,包含断层与压裂裂缝的方位的压裂井到断层距离在Laplace空间的精确解。通过数值反演就可以获得其典型曲线,为压裂井试井解释识别边界反映提供了一种新方法。同时用实例分析,说明该理论正确性和实用性。

A NOVEL METHOD OF DETERMINING THE DISTANCE FROM FRACTURED WELL TO FAULT

In current methods of well test interpretation, the distance from well to fault is usually obtained from approximate image. In the case of fractured wells (especially those close to fault or with long fractures) where boundary effects occur long before the bilinear flow ends, the method of approximate image becomes complicated. In this paper, the precise solution inLaplace space of the distance from fractured well to fault, including the orientation of fractures and fault, is formulated through the deduction on precise image. By applying inversion theorem for the Laplace transformation, type curves can be obtained. The proposed method provides a new way of recognizing fractured well boundary reflection, and case applications indicate that the method is accurate and reliable.