Anhydride-modified chitosan, method of preparation thereof, and fluids containing same
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United States of America Patent
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Aug 24, 2004
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app pub date -
Jan 21, 2003
filing date -
Dec 28, 1998
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Abstract
The invention provides an organic diacid anhydride-modified chitosan and a method of preparing the same under high shear conditions which eliminates the use of solvents and excessive amounts of aqueous liquids. Also provided are organic diacid anhydride-modified chitosans containing an inorganic basic material which enhances the aging stability thereof. The invention also provides fluids useful in various well drilling and servicing operations comprising an alkaline aqueous liquid containing an organic diacid anhydride-modified chitosan, as well as a method of drilling wells therewith.
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