Mechanical and rheological behavior of oil-well cement slurries produced with clinker containing carbon nanotubes

This paper analyzes the influence of carbon nanotubes (CNTs) on the rheological and mechanical properties of cement slurries used in oil wells. CNTs were grown directly onto the cement clinker by chemical vapor deposition. Cement pastes containing 0.1% and 0.3% of CNT bwoc were compared with CNT-free slurries. Lignosulfonate (0.2% bwoc) was used as dispersant in all cement slurries. Compressive and tensile strength were evaluated at the ages of 48 h and 7 days. The results show that the addition of CNTs does not alter the rheological behavior and stability of the cement slurries considering the dispersant and concentrations employed. On the other hand, the presence of CNTs in the cement slurries increases the tensile strength by approximately 15% at 48 h and 7 days of aging for 0.1% CNT bwoc.