Method for enhanced oil recovery through a horizontal production well in a subsurface formation by in-situ combustion
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United States of America Patent
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May 18, 1993
Grant Date -
N/A
app pub date -
Feb 21, 1992
filing date -
Feb 21, 1992
priority date (Note) -
Expired
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Abstract
A horizontal production well is located in the lower portion of a heavy viscous oil-bearing reservoir. A vertical injection well is located in the upper portion of the reservoir. Oxygen-enriched gas is injected down the injector well and ignited in the upper portion of the reservoir to create a combustion zone that reduces viscosity of oil in the reservoir as the combustion zone advances downwardly toward the horizontal production well, the reduced-viscosity oil draining into the horizontal production well under force of gravity.
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