Thermally stable thiosulfate hydroxyethylcellulose suspension
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United States of America Patent
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Apr 18, 1995
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app pub date -
Apr 8, 1993
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Apr 8, 1993
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Abstract
A storage and thermally stable polymer suspension in fresh water remains pourable after mixing at 6 months comprises at least 30% ammonium or sodium thiosulfate and 20% hydroxyethylcellulose. In an oil drilling fluid, yield value decreases less than 35% when heated for 16 hours at 250.degree. F.
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