Transient analysis for fractured gas wells by modified pseudo-functions in stress-sensitive reservoirs

Wenli Xu, Xiaodong Wang, Xiaochun Hou, Kamugisha Clive, Yingfang Zhou

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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, indicatingm 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 stresssensitive
gas reservoirs.
Original languageEnglish
Pages (from-to)1129-1138
Number of pages10
JournalJournal of Natural Gas Science & Engineering
Volume35
Issue numberPart A
Early online date16 Sep 2016
Publication statusPublished - Sep 2016

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Keywords

  • A stress-sensitive gas reservoir
  • vertical fractured well
  • pseudo-functions
  • fracture conductvity
  • transient analysis

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