ALTERNATING SAGD INJECTIONS
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United States of America Patent
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Issued Date -
Apr 30, 2015
app pub date -
Oct 27, 2014
filing date -
Oct 30, 2013
priority date (Note) -
Abandoned
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Abstract
Methods produce heavy oil with steam assisted gravity drainage. Such methods alternate a traditional steam injection with an injection of a steam-plus-non-condensable gas (such as CO2 or CO2-plus-diluent) mixture. The CO2/diluent mixture is soluble in bitumen, leading to a reduction in viscosity of the heavy oil. Additionally, the steam-only injection reduces the accumulation of vapor NCG along the edge of the steam chamber, leading to improved thermal efficiency.
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