Method of using alkylsulfonated phenol/aldehyde resins as adsorption reducing agents for chemical flooding
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United States of America Patent
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May 18, 2004
Grant Date -
Jan 22, 2004
app pub date -
Jul 22, 2002
filing date -
Jul 22, 2002
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Abstract
A method of recovering oil or contaminants from subterranean reservoirs using a surfactant system where an adsorption reducing agent is injected before, after, and/or with the surfactant system. The adsorption reducing agent is formed by the reaction of an olefin sulfonic acid and phenol/aldehyde resin, the structure which is shown below where M may be Hydrogen or any cation, R is hydrogen, alkyl, alkenyl, etc., X is methylene or other aldehyde derived bridge, Y is hydrogen, ethylene oxide, propylene oxide, butylene oxide or mixtures of two or more of these, x+y is greater than 2 and n is equal or greater than 1. ##STR1##
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