A new cement additive has been developed which improves slurry performance and reduces cost. The additive is a vitrified aggregate of calcium-magnesium aluminosilicates with potential cementitious reactivity, hereafter abbreviated CMAS. CMAS has been used successfully on oil and gas wells throughout Indonesia.

The purpose of this paper is to illustrate the technical enhancements and cost effectiveness of slurries incorporating CMAS. Laboratory data is presented and working mechanisms are defined to highlight CMAS's positive effect on; compressive strength, fluid loss control, free water control, gas migration control, resistance to strength retrogression and aggressive fluids. Finally, case studies and an economic analysis are presented to show the cost savings for actual well applications.

Keywords:
cement particle, compressive strength, cement property, society of petroleum engineers, cement chemistry, upstream oil & gas, portland cement, cost breakdown, slurry property, cement formulation
Subjects:
Casing and Cementing, Cement formulation (chemistry, properties)
Copyright 1994, Society of Petroleum Engineers
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