Abstract
ABSTRACT Analytical solutions are presented for studying the interference pressure behavior in a multi-layered, composite reservoir. The model considers an infinitely large reservoir with two partially or fully completed wells. Fluid interlayer crossflow is included. Each layer consists of two concentric zones, an inner and an outer region of uniform reservoir rock and fluid properties, separated by a mobility discontinuity. The solutions are validated by comparison with the results obtained from several limiting models for interference testing, specifically the homogeneous single layer reservoir, the single layer composite system, and the two-layered systems with and without crossflow. A sensitivity study is presented to examine the influence on pressure response of wellbore storage and skin effects at the active well, inter-layer crossflow, diffusivity ratio, mobility ratio, and permeability ratio. Dimensionless pressure type curves are developed for estimating valuable formation characteristics of transmissibility and storativity from interference test data.
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