Journal of Canadian Petroleum Technology
Volume 50,
Number 7,
July 2011,
pp. 34-45
Summary
Gases such as carbon dioxide, nitrogen, and methane that can be present in a
steam-assisted gravity-drainage (SAGD) steam chamber (but do not condense into
the liquid phase to any large degree at reservoir conditions) are referred to
as noncondensable gases (NCGs). The coinjection of NCGs with steam during SAGD
results in changes in production rate, total oil production, and the amount of
steam required to mobilize the bitumen in place. To investigate the impact of
NCGs on SAGD performance by means of numerical simulation, it is important to
model gas solubility in both bitumen and water accurately. Also, the dependence
of relative permeability on temperature needs to be accounted for to achieve
reliable results. This study presents a systematic approach to predict the
K-values for the gas/bitumen- and gas/water-phase equilibria over a wide
range of pressures and temperatures.
© 2011. Society of Petroleum Engineers
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History
- Original manuscript received:
11 February 2011
- Revised manuscript received:
18 March 2011
- Manuscript approved:
23 March 2011
- Published online:
1 July 2011
- Version of record:
14 July 2011
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