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XCD Polymer (Xanthan Gum)
CAS - 11138 - 66 - 2
CAS - 11138 - 66 - 2
XCD Polymer (Xanthan Gum)
CAS - 11138 - 66 - 2
Application
XCD Polymer is a high-molecular-weight xanthan gum biopolymer (CAS 11138-66-2) used primarily as a viscosifier and rheology modifier in the oil and gas industry. It is valued for its ability to maintain stable fluid properties in water-based systems, especially under the high-salinity and extreme temperature conditions common in downhole environments.
Core Applications
- Drilling Fluids (Muds):
- Cuttings Suspension: Provides high viscosity at low shear rates to keep drill cuttings suspended and prevent them from settling when circulation stops.
- Hole Cleaning: Improves the transport of debris and heavier solids (like gravel) from the wellbore to the surface.
- Wellbore Stability: Helps form a low-permeability filter cake on the wellbore wall to prevent collapses and protect the oil formation.
- Completion and Workover Fluids:
- Maintains fluid viscosity to ensure zonal isolation and suspends bridging or weighting agents.
- Reduces fluid loss into permeable formations during well finalization or maintenance.
- Enhanced Oil Recovery (EOR):
- Used in polymer flooding to increase the viscosity of injected water.
- Improves sweep efficiency by reducing the mobility ratio between water and oil, leading to higher extraction rates.
- Hydraulic Fracturing (Fracking):
- Acts as a thickening agent to effectively carry and place proppants (like sand) into rock fractures.
Key Performance Properties
- Pseudoplasticity (Shear Thinning): Becomes thin and easy to pump under high shear (pressure) but thickens rapidly once shear is removed, allowing for both efficient flow and excellent suspension.
- Thermal & Chemical Stability: Typically stable up to 250°F (121°C) and across a wide pH range (typically 5–11), resisting degradation from acids, alkalis, and salts.
- Salt Tolerance: Unlike many synthetic polymers, it remains effective in high-brine and saturated salt environments.
Environmental Safety: As a natural polysaccharide, it is biodegradable and non-toxic, making it preferred for offshore and eco-sensitive operations.
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