XCD POLYMER, an industrial grade of xanthan gum, is a high-molecular-weight
linear polysaccharide that is readily soluble in water to form a
viscous, highly non-Newtonian solution.
XCD POLYMER builds viscosity and gel structure in all water-based
systems. The type of structure resulting from the use of XCD
POLYMER varies directly with the rate of shear. This enables the user to
take advantage of the extremely low viscosities of this system, while
pumping down the drill pipe and out the bit nozzles, to increase
the penetration rate.
At the same time, as the rate of shear decreases in the annular
space between the drill pipe and the well bore, the structure increases,
enhancing the carrying capacity of the circulating fluid.
XCD POLYMER may be used in any water-base mud for improved lifting
Normal recommendation is one pound per barrel of XCD POLYMER for
viscosity of 35 to 38 sec/qt.
Adjust pH to 7.5 to 10 by slowly adding dilute caustic soda or potassium
Add DSC CIDE as a preservative, since XCD POLYMER is subject to bacterial
Small additions of fluid-loss control agents may be needed (CMC,
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