Method of and composition for reducing the loss of fluid during well drilling, completion or workover operations
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United States of America Patent
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May 13, 2003
Grant Date -
Dec 20, 2001
app pub date -
Jul 3, 2001
filing date -
Dec 28, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a composition for and method of reducing the loss of fluid from well drilling, completion, or workover fluids during well drilling, completion, or workover operations, particularly for reducing or overcoming the lost circulation of drilling fluids. The composition comprises an aqueous liquid containing partially hydrated chitosan particles wherein the chitosan particles have been partially hydrated at a pH less than about 4.5, and wherein the aqueous liquid has a pH of at least about 6.5 such that any further solublizing of the chitosan is prevented. The aqueous liquid, preferably when mixed with a drilling, completion, or workover fluid, is effective in decreasing the loss of such fluids after introducing the partially hydrated chitosan-containing liquid or fluid into the flow passages in a well to which such fluids are being lost.
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