Fumed silica A-200 (or similar grades like Aerosil® 200) is widely used to enhance the performance of oilwell cement slurries under challenging downhole conditions. Below are specific application examples demonstrating its role in optimizing slurry properties:

3. Suspension Aid for High-Density Slurries
Scenario: Cementing deep HPHT wells requiring high-density slurries (≥1.9 SG) using hematite or ilmenite weighting agents.
Problem: Weighting agents settle during pumping or static periods, causing density segregation and poor zonal isolation.

Solution: Add fumed silica A-200K (1–2% BWOC) to create a 3D network that suspends solids.

Result:
Zero free fluid and <0.1% density variance after static aging at 120°C for 4 hours.
Enhanced slurry stability even at bottomhole temperatures >150°C.
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