The Effect of GGBFS on the Rheological and Compressive Strength Properties of Oil well Cement Slurries by Using "Superplasticizer"

Cementing around the casing in oil and gas wells provides proper zonal isolation, holds the casing in place, and prevents fluid migration is an important part of the completing process and well plugging for abandonment. A reliable cement rheology prediction is central to the success of oil well-cementing operations. Properties of the rheological are plastic viscosity and yield stress by using advanced shear-stress/shear-strain controlled Viscometer with using Ground Granulated Blast Furnaces Slug, and Superplasticizer investigated. The effect replacement of Class G cement according to API [1]. (American petroleum institute) classification is performed at different rates. (15%-75%) Blast Furnaces Slag (GGBFS) at intervals of 15%. Further, by using different curing conditions (moist curing and @38°C, @60°C water path curing chamber). The results show that blended cement with 45% of GGBFS has significantly increased in compressive strength more than unblended cement type G. This happened because the fine micro GGBS influences the heat of hydration through the pozzolanic reaction and the effect of superplasticizer. The double effect of GGBS and Superplasticizer on the plastic viscosity and yield point, the linear relationship between shear stress and shear rate, by using Bingham plastic Fluid Model, the slurries act as Newtonian behavior at high shear.