Corrosion Characteristics of Polymer-Modified Oil Well Cement-Based Composite Materials in Geological Environment...

Oil well cement is easily damaged by carbon dioxide (CO₂) corrosion, and the corrosion of oil well cement is affected by many factors in complex environments. The anti-corrosion performance of oil well cement can be improved by polymer materials. In order to explore the influence of different corrosion factors on the corrosion depth of polymer-modified oil well cement, the influence of different corrosion factors on corrosion depth was studied based on the Box-Behnken experimental design. The interaction of different influencing factors and the influence of multiple corrosion depths were analyzed based on the response surface method, and a response surface model was obtained for each factor and corrosion depth. The results indicate that within the scope of the study, the corrosion depth of polymer-modified oil well cement was most affected by time. The effects of temperature and the pressure of CO₂ decreased sequentially. The response surface model had good significance, with a determination coefficient of 0.9907. The corrosion depth was most affected by the interaction between corrosion time and the pressure of CO₂, while the corrosion depth was less affected by the interaction between corrosion temperature and corrosion time. Improving the CO₂ intrusion resistance of cement slurry in an environment with a high concentration of CO₂ gas can effectively ensure the long-term structural integrity of cement.