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.
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 language | English |
|---|---|
| Pages (from-to) | 1129-1138 |
| Number of pages | 10 |
| Journal | Journal of Natural Gas Science & Engineering |
| Volume | 35 |
| Issue number | Part A |
| Early online date | 16 Sept 2016 |
| Publication status | Published - Sept 2016 |
Bibliographical note
AcknowledgmentsThis article was supported by Excellent Supervisor Fund of Basal Research Fund of China University of Geosciences (Beijing) (Grant No. 53200859546), the National Major Research Programme for Science and Technology of China (Grant No. 2011ZX05009-004). The anonymous reviewers and the editors are greatly appreciated for their careful reviews and detailed comments.
Keywords
- A stress-sensitive gas reservoir
- vertical fractured well
- pseudo-functions
- fracture conductvity
- transient analysis