Viscosified aqueous chitosan-containing well drilling and servicing fluids
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United States of America Patent
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Sep 18, 2001
Grant Date -
Jul 19, 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 aqueous viscous or gelled alkaline fluids particularly useful in oil and gas well operations, and a method of drilling a well therewith. The fluids contain chitosan, an amine reactive acid, and an aldehyde therein, whereby the amine reactive acid and the aldehyde react with the primary amino group on the chitosan to increase the viscosity and stability of the fluid. The fluids are also useful wherein other chitosan-containing fluids are utilized. The preferred amine reactive acid is glyoxylic acid, and the preferred aldehyde is lactose.
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