| 摘要 |
Solid paraffin-containing material deposited on oil well surfaces are removed by contacting the deposited paraffin with an aqueous solution A composed of alkali metal metasilicate, tri(alkali metal) phosphate, tetrapotassium pyrophosphate, alkali metal hexametaphosphate, alkylphenol/ethylene oxide adduct, ethylene glycol monobutylether and methyl cellulose ether stabilizer and then adding to solution A, a solution B comprising concentrated sulfuric acid and a foam stabilizer.
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