The Effect of Graphite on the Properties of Class G Oil Well Cement

Cementing process is one of the most crucial parts in drilling operation that could determine the durability and stability of the oil or gas well. Many additives had been introduced into the formula of the oil well cement to reach certain qualities to support the well. This study intends to analyze the effect of graphite on the properties of the hardened cement samples as a function of curing time, and compare the change in the properties with that for the samples prepared without graphite. The alteration in properties of the cement compressive strength, Poisson's ratio, Young's modulus, and permeability were studied with curing time. The results showed that the graphite successfully increased the compressive strength, and Poisson's ratio while Young's modulus was reduced which indicates an enhancement in cement strength and elasticity. The cement sheath permeability was also decreased indicating formation of more tight cement sheath with incorporation of graphite into the cement slurry.