Effect of graphene oxide on the hydration and strength properties of oil well cement

AbstractThe present study investigates the effect of graphene oxide on the hydration and strength properties of oil well cement (OWC) paste cured at 50 °C. Hydration heat evolution was tested using isothermal calorimetry, and hydration products were examined using X-ray diffraction and thermogravimetric analysis. Results indicated that the dispersion stability of GO suspension was obviously improved by polycarboxylate superplasticizer (PCE). The fluidity of OWC paste decreased as the GO dosage increased. GO had a slight influence on the hydration degree of OWC pastes, but it drastically affected the crystal orientation of portlandite formed. The addition of GO significantly enhanced the strength properties of OWC pastes when compared to the control, with a greater impact on flexural strength than compressive strength, leading to an improvement in the toughness. Incorporating 0.02% GO led to additional 28.8% and 11.2% increments of compressive strength as well as 63.6% and 34.2% increments of flexural strength at 1 day and 28 days, respectively.Keywords: Graphene oxideoil well cementhydrationstrength Disclosure statementThe authors declared that they have no conflict of interest in the submission of this manuscript, and manuscript is approved by all authors for publication. I would like to declare on behalf of my coauthors that the work described was original research that has not been published previously, and not under consideration for publication elsewhere, in whole or in part. All the authors listed have approved the manuscript that is enclosed.Additional informationFundingThis work was supported by the National Natural Science Foundation for Young Fund of China (52102025), the Sinopec Well Cementing and Completion Key Laboratory Open Fund (21-GWJ-KF-1) and the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions.