Viscosified aqueous chitosan-containing well drilling and servicing fluids
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United States of America Patent
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Mar 19, 2002
Grant Date -
Jul 26, 2001
app pub date -
Feb 13, 2001
filing date -
Dec 28, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention provides well drilling and servicing fluids comprising an alkaline aqueous liquid containing chitosan, an anhydride, and an aldehyde therein. The invention further provides a method of drilling a well wherein there is circulated in the wellbore during drilling a drilling fluid comprising an alkaline aqueous liquid containing chitosan and an anhydride, and optionally an aldehyde therein.
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