Applications/Functions
- Viscosifies fresh water and brine-based fluids used for drilling, milling, underreaming, and gravel packing operations
- Suspends bridging agents and weighting materials in fresh water and brine systems
Advantages
- Highly effective viscosifier with minimal treatment producing significant results
- Shear-thinning rheological profile for improved hydraulics
- Provides excellent suspension without the need for clays
- Minimizes the potential for formation damage
- Stable up to 250°F
Xanthan gum is a high-molecular-weight polysaccharide polymer produced by Xanthomonas bacteria through carbohydrate fermentation. When exposed to high temperatures, xanthan gum undergoes a conformational transition from an ordered to a disordered state. The temperature at which this transition occurs is known as the melting temperature. In the disordered state, the viscosity of its aqueous solution is significantly lower than in the ordered state. At temperatures exceeding 120°C, xanthan gum gradually degrades due to thermal breakdown, rendering it unsuitable for high-temperature, high-salinity downhole conditions.
The company has developed a heat-resistant xanthan gum (120°C-rated), effectively addressing this issue and enabling its widespread application in high-temperature, high-pressure (HTHP) oil wells.
The company's temperature-resistant xanthan gum employs a polymer grafting process to enhance its thermal and salt tolerance. This modified xanthan gum is suitable for clay-free brine drilling fluid systems in high-temperature deep-well reservoirs, offering superior suspension capacity and significant viscosity-building effects.
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