Fumed silica A-200 (or comparable grades like Aerosil® 200) is widely utilized in completion fluid stabilization due to its nanoscale particle size (~12 nm), high surface area (~200 m²/g), and excellent suspension/thixotropic properties. Below are key application examples:

3. Improving Thermal Stability of Polymer-Based Fluids
Challenge: Polymer-thickened completion fluids (e.g., xanthan gum) may degrade at high temperatures (>120°C), losing viscosity and suspension capacity.
Solution: Fumed silica acts as a thermal stabilizer by reducing fluid mobility and protecting polymers from thermal breakdown.
Case Example: In a Kuwaiti thermal well (150°C), a xanthan-based completion fluid with 1% fumed silica retained 80% of its initial viscosity after 48 hours, whereas the control sample lost >50% viscosity.
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