The Effect of Rice Husk-Derived Graphene-like Materials on the Mechanical Properties of Oil Well Cement-Based Composite Materials

The early mechanical properties of a cement sheath are not good when the temperature of the oil and gas wells is low, and it is easily damaged. The rice husk-derived graphene-like (RCG) materials were used to improve the mechanical properties of oil well cement-based composite materials. The rice husk-derived graphene-like materials were prepared using agricultural waste rice husks with a lower cost. The rice husk-derived graphene-like materials were analyzed using X-ray diffraction and Raman spectroscopy. The effect of the rice husk-derived graphene-like materials on the mechanical properties and microstructure of oil well cement was studied. The results show that the prepared graphene-like materials are a type of multi-layer graphene with certain defects. The compressive strength of the cement sample after curing for 28 days increases by 35.58%; its flexural strength increases by 25.33%, and its impact strength increases by 40.94% with 0.06 wt% of the graphene-like materials. The graphene-like materials derived from rice husks do not lead to the generation of a new hydration product in oil well cement. It mainly enhances the mechanical properties of cement paste by affecting hydration crystallization. This article provides a reference for studying the improvement of mechanical properties of oil well cement-based composites using eco-friendly materials.