Enhanced hydrocarbon recovery by steam injection of oil sand formations
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United States of America Patent
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Jan 18, 2011
Grant Date -
Jun 11, 2009
app pub date -
Feb 12, 2009
filing date -
Feb 27, 2006
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Abstract
A method and apparatus for enhanced recovery of petroleum fluids from the subsurface by injection of a steam and hydrocarbon vaporized solvent in contact with the oil sand formation and the heavy oil and bitumen in situ. Multiple propped hydraulic fractures are constructed from the well bore into the oil sand formation and filled with a highly permeable proppant. Steam, a hydrocarbon solvent, and a non-condensing diluent gas are injected into the propped fractures, and flows upwards and outwards to contact and heat the in situ bitumen, which softens and flows by gravity to the well bore, and is pumped to the surface where the solvent can be recycled for further injection.
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