Journal of Canadian Petroleum Technology
Volume 51,
Number 3,
May 2012,
pp. 193-197
Summary
In Alberta and British Columbia, a huge amount of tight gas is trapped in
relatively low-permeability rock formations. Physical fracturing of these
formations could enhance the overall formation permeability and thus improve
tight gas extraction. One of the outstanding issues in rock fracturing is to
determine the magnitude of applied effective stress. The general
effective-stress law is defined as σeff =
σc - ασp, where σc and
σp are total confining stress and fluid pore pressure,
respectively. Each physical quantity of rock responds to total stress and pore
pressure in a different way, and thus each quantity has its own unique Biot's
effective-stress coefficient. The main objective of this study is to
experimentally determine the Biot's coefficient for permeability of Nikanassin
sandstone. A series of permeability measurements was conducted on Nikanassin
sandstone core samples from the Lick Creek region in British Columbia under
various combinations of confining stress and pore pressure. In addition,
permeability values were measured both along and across bedding planes to
investigate any anisotropy in the Biot's coefficient.
© 2012. Society of Petroleum Engineers
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History
- Original manuscript received:
6 April 2009
- Meeting paper published:
16 June 2009
- Revised manuscript received:
30 June 2011
- Manuscript approved:
30 June 2011
- Published online:
27 February 2012
- Version of record:
1 May 2012
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