Chapter 8

Interpretation Theory for Vertical Interference Testing Across a Low-Permeability Zone

Abstract

An interpretation theory for the vertical interference testing across a low-permeability zone is given, which includes skin factor of each layer, wellbore storage, interlayer crossflow, leakage behind the casing, and storativity of the low-permeability zone. The inclusion of the storativity of the low-permeability zone makes the calculated pressures for both the active and the observation zones much closer to the measured pressures. The inclusion of the leakage behind the casing makes it possible to interpret the vertical interference test of a well that is poorly cemented. It also provides a tool for studying the leakage behind the casings. ...

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