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:

2. Enhancing Suspension of Bridging Agents
Challenge: Bridging agents (e.g., calcium carbonate, salt particulates) in drill-in/completion fluids may settle rapidly, reducing formation damage control efficiency.
Solution: Fumed silica adsorbs on particle surfaces and creates gel-like behavior under static conditions, keeping bridging agents suspended.
Case Example: In a Gulf of Mexico well, a sodium formate brine containing 20% calcium carbonate (bridging agent) was stabilized with 1.5% A-200K. The fluid maintained homogeneous suspension for 72 hours at 95°C, ensuring effective filter cake deposition.
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