Use of esters of sulfonic acids as anti-sludge agents during the acidizing of formations containing sludging crude oils

摘要

An anti-sludge agent useful for acid stimulated hydrocarbon containing formations is an ester of sulfonic acid, e.g. monoethoxylated dodecyl benzene sulfonic acid, preferably used in combination with from 0. 1 to 2 parts by weight of a surfactant.