Procedure for improving reservoir sweep efficiency using paraffinic or asphaltic hydrocarbons
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United States of America Patent
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Jun 27, 1989
Grant Date -
N/A
app pub date -
Sep 15, 1988
filing date -
Sep 15, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for selectively placing and removing a plugging agent in a formation adjacent a wellbore comprising preheating the wellbore, heating and injecting the plugging agent at a temperature higher than its melting point, shutting in the well to allow the plugging agent in the formation to cool and solidify, reheating the formation adjacent the wellbore, and swabbing back the liquidified plugging agent from the low permeability zones adjacent the wellbore. The expected benefit is reduction of permeability in the high permeability zones without a corresponding loss of permeability in the low permeability zones. The method provides better vertical sweep and improved recovery.
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