Thermal oil recovery with solvent recirculation
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United States of America Patent
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-
Dec 6, 1983
Grant Date -
N/A
app pub date -
Jan 7, 1982
filing date -
Jan 7, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for the production of heavy oil from a subterranean oil reservoir by the injection of a hot aqueous fluid into the reservoir and the injection of a diluent solvent down the production well to produce a blend of solvent and oil having a decreased viscosity. The reservoir oil has a density greater than the density of water. The diluent solvent has a density such that the density of the resulting blend recovered from the production well also has a density greater than the density of the water. The water produced from the production well is separated from the blend and the blend then fractionated to recover a solvent fraction of the requisite density. This solvent fraction is then returned to the production well to produce additional blend within the well in a continuation of the process.
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