CO₂ Corrosion Resistance of Cementing Stone with Micro Silicon

By testing the permeability, compressive strength and corrosion depth of cementing stone before and after corrosion, the corrosion resistance of cementing stone with different micro-silicon additions was evaluated. Using scanning electron microscope (SEM) and X-ray diffractometer (XRD), the CO₂ corrosion resistance of micro-silicon cementing stone was analyzed. The results showed that compared with the blank cementing stone, the thickening time of cementing stone with 3%, 6% and 9% micro-silicon added was shortened by 11-38 min, the water loss was reduced by 8-27 mL, and the free liquid was reduced to 0, compressive strength and flexural strength of micro-silica cementing cement were increased by 11.1%-46.7% and 49.8%-104.9%, respectively, and permeability was reduced by 0.026-0.046 mD. When micro-silicon addition amount was 9%, the compressive strength decline rate and permeability change rate of micro-silicon cementing stone after corrosion for 21 days were 8% and 16%, respectively. The addition of micro-silicon improved the CO₂ corrosion resistance of cementing stone, and the greater the amount of micro-silicon added, the better the CO₂ corrosion resistance of cementing stone. The addition of micro-silicon improved the density of cementing stone and reduced the corrosion degree of cementing stone to a certain extent.