Influence of different additives on the creep property of oil well cement

As the exploitation of oil and gas field becomes more difficulty nowadays, severe casing deformation may occur if anti-extrusion strength decreases to a certain degree this brings large economic loss safety problems. an annular sheath between formation, creep well cement paste is one most important factors in deciding abnormal wellbore integrity. To figure out mechanism on how reduce value paste, effect different additives, e.g., retarder, glass fibre reinforcement CSA expansive agent are investigated study. It can be found that retarder plays negative role reducing with 1, 2, 3% 2.39%, 7.85%, 15.02% higher than without at 12 h. Results from heat flow indicates play prolonging early induction period hydration rate middle later stages. On contrary, Glass shows positive reaches 0.2%, 0.4%, 0.6%, 0.8% 1.27%, 6.61%, 9.82%, 12.60% lower addition 72 This because high porosity around fibers based microstructure observation lead continuous uniform stress consequently paste. also considerably effective limiting ages. There acceleration both periods corresponding maximum 7.3%, 9.0%, 11.2% reference no addition. The results obtained study aimed provide theoretical basis for integrity improvement recovery.