Method of reducing the reactivity of steam and condensate mixtures in enhanced oil recovery
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United States of America Patent
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Aug 6, 1991
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N/A
app pub date -
Nov 27, 1989
filing date -
Nov 10, 1988
priority date (Note) -
Expired
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Abstract
This invention relates generally to a method for reducing the reactivity of steam or mixtures of steam and condensate in enhanced oil recovery. More particularly, the method of the invention comprises pH control through the injection or addition of either or both of ammonia and an ammonium salt of an organic or inorganic acid, such as ammonium chloride, to the feed water used to generate the steam or to the steam itself. This inhibits the dissolution of certain mineral groups, controls the migration of fines, inhibits the swelling of clays, controls chemical reactions in which new clay minerals are formed, and helps to prevent the precipitation of asphaltenes and the formation of emulsions as a result of steam injection.
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