Abstract
In this work, different percentages of Nano silica additive have been added to the two basic drilling cement samples, with 90PCF and 118PCF densities. The results showed that not only has the rate of gas migration in cement decreased, but also other conventional properties of cement, including strength, have improved in some cases. Possible and testable percentages of Nano additive were 0.11, 0.22, 0.33 and 0.55 percent. Measurements by the SGSA device have shown a reduction in the transient time or critical time of cement hydration. In 90PCF slurry, the transient time from 120min to 55MIn has been reduced by adding 0.33% Nano silica. Compressive strength increased from 723psi to 1239psi. The FMA also showed a decrease in fluid migration from 38ml to 15ml. Triaxial experiments have shown an increase in Peak Stress from 22MPa to 25 MPa. In slurries with a density of 118PCF, adding 0.11% Nano silica, the transient time was reduced from 170min to 100min. The compressive strength has been increased from 2089psi to 3020psi. The rate of fluid migration in cement has decreased from 4ml to 0ml. Also, the peak stress rate has increased from 60MPa to 71MPa. In addition, the XRD experiment emphasized the improvement of the cement microstructure after the addition of Nano-silica
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