Method of controlling growth and heat loss of an in situ gravity draining chamber formed with a condensing solvent process
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United States of America Patent
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May 7, 2013
Grant Date -
Mar 31, 2011
app pub date -
Sep 25, 2009
filing date -
Sep 26, 2008
priority date (Note) -
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Abstract
A solvent based gravity drainage process whereby the vertical growth rate of the chamber is restricted by placing, monitoring and managing a buoyant gas blanket at the top of the vapor chamber. The process reduces the heat loss to the overburden as well as providing a means to preserve a barrier layer of bitumen saturated reservoir sand at the top of the pay zone in reservoirs where there is limited or no confining layer present.
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