Abstract
In order to study the effect of stress sensitivity on transient flow behavior for fractured wells, this article demonstrates how to account for stress sensitivity effect in gas reservoirs using modified pseudo-functions approach. By making this modification, the governing equation can be linearized. This study presents production performance of gas well for the most widely used inner conditions: constant flow rate and constant bottom-hole pressure. Furthermore, type curves are generated to investigate the effects of stress sensitivity, reservoir size and fracture properties (i.e., conductivity and half-length). Calculative results show that a bigger stress-sensitivity coefficient will lead to higher degree of bend upward on the log-log pressure curves, indicating bigger pressure depletion and rate decline in the late-time period; reservoir size mainly affects the duration of pressure depletion and rate decline; fracture conductivity and fracture half-length affect pressure and production in the early-time period. This study provides comprehensive analysis of stress sensitivity for fractured gas wells and new insight into investigating production performances in stress-sensitive gas reservoirs.
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