Effects of Curing Pressure on the Long-Term Strength Retrogression of Oil Well Cement Cured under 200 °C

The influences of curing pressure on the physical and mechanical property development oil well cement during long-term were studied. Five silica-enriched slurries designed without with reinforcement materials (latex fiber nano-graphene) autoclaved at 200 °C under two different pressures. low (50 MPa) was conducted for 2, 60, 90 180 days; high (150 2 360 days. properties set characterized by compressive strength, Young’s modulus, water/gas permeability; mineral composition microstructure determined X-ray diffraction, mercury intrusion porosimetry, thermogravimetry scanning electron microscope. Test results showed that led to a more compact microstructure, which reduced rate strength retrogression in long term. Samples materials, especially latex fiber, higher modulus lower permeability both