SPE Journal
Volume 17,
Number 3,
September 2012,
pp. 717-726
Summary
A model-assisted analysis is presented of pressure-pulse-transmission data
obtained under different pressure conditions with core plugs of shale-gas
formations. Applications and validations for steady-state and transient-state
laboratory tests are provided. Best-estimate values of the intrinsic
permeability and tortuosity at a reference condition and the Langmuir volume
and pressure are determined by matching the solution of a modified Darcy model
to several pressure-pulse-transmission flow tests with core samples
simultaneously. The data-interpretation model considers the prevailing
characteristics of the apparent permeability under the various flow regimes
involving gas flow through extremely low-permeability core samples. Further,
the present fully pressure-dependent shale- and gas-property formulation allows
for model-assisted extrapolation from the reference conditions to field
conditions once the unknown model parameters have been estimated under
laboratory conditions. The improved method provides a better match to the
measurements of the pressure tests than previous models, which assume only
Darcy flow.
© 2012. Society of Petroleum Engineers
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History
- Original manuscript received:
20 August 2011
- Meeting paper published:
15 June 2011
- Revised manuscript received:
23 February 2012
- Manuscript approved:
28 February 2012
- Published online:
16 August 2012
- Version of record:
12 September 2012
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