Diutan gum is a polysaccharide used for applications that require very high suspending characteristics such as Enhanced Oil Recovery EOR and oilfield drilling fluids.
Diutan Gum is a high molecular weight biopolymer of Xanthan Gum. Xanthan gum is commonly used in drilling fluids to provide viscosity, solid suspension, and fluid-loss control. However, it is sensitive to high temperatures and not tolerant of field contaminants. Diutan gum offers the same functions but overcomes the deficiencies of xanthan gum.
Diutan Gum is used mainly used to adjust the viscosity of freshwater, seawater, or saline muds. It also provides a measure of filtration control.
Diutan Gums tertiary structure is a double-helix. It is closer to that of welan gum than that of xanthan gum. However, there are significant differences. Diutan Gum has an average molecular weight of 5×106, which is much higher than those of welan and xanthan. This is why the length of the diutan molecule is larger than that of welan or xanthan.
Diutan gum is a bio-fermented polymer produced by an isolated naturally-occurring bacterial strain of the Sphingomonas genus. It is an anionic extracellular polysaccharide. Vicious aqueous Diutan gum solutions show a strong ability of water retention capacity, salt tolerance, suspending power, and thermal stability ranging from 5 to 150 °C. It is stable across a wide pH range and can be used in weighted and unweighted drilling fluids, completion fluids, and other systems.
Diutan Gum is designed to provide viscosity on various depth wells where value and performance levels are critical.
Preparation & Procedures
Diutan Gum disperses in water with moderate agitation. Continued mixing provides a smooth viscous fluid. It should be added slowly to the active system to achieve to reduce the chances of lumping.
Those working with Diutan Gum should wear appropriate Personal Protective Equipment, including dust masks and eye protection. It is advisable to wear PPE while mixing products.
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