Well treatment fluid and methods with oxidized chitosan-based compound
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United States of America Patent
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Jul 20, 2004
Grant Date -
N/A
app pub date -
Mar 21, 2003
filing date -
Mar 21, 2003
priority date (Note) -
Expired
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Abstract
The present invention provides a well treatment fluid that contains water, an oxidized chitosan-based compound, and a water-soluble compound having carbonyl groups, wherein the oxidized chitosan-based compound has the property of being soluble in water up to about 2 wt % while maintaining a viscosity of less than about 1000 cp. The water used for the well treatment fluid is selected from the group consisting of fresh water, seawater, natural brine, formulated brine, 2% KCl solution, and any mixtures in any proportion thereof. The present invention also provides a method of treating a subterranean formation penetrated by a wellbore comprising the steps of: (a) forming the well treatment fluid, and (b) contacting the subterranean formation with the fluid.
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