Abstract:

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.

Key words: image, fractured well, transient well test, fault, distance