Evaluating Statistically the Impact of Waste-Glass Particles on the Compressive Strengths of Oilwell Cement Sheath Systems

Abstract This study investigates the compressive strength (CS) of oilwell cement sheath systems (CSSs) that are integrated with waste-glass particles and Class G oilwell cement. Based on the available literature, previous research has shown successive proofs for the use of waste-glass particles in masonries and road buildings, materials on applications of glass-waste are scanty. In this study, two categories of Class G oilwell cement sheath systems (CSSs) were prepared: Category "A" (clean Class G oilwell CSSs) and Category "B" (integrated waste-glass Class G oilwell CSSs). Both categories were prepared using a water-to-cement ratio of 0.44, and were subjected to curing for 7, 14, and 21 days under ambient conditions. Additionally, the controlled experimental samples were prepared by 0% of waste-glass powder; while the investigated experimental samples were prepared by substituting different percentages (5%, 10%, 15%, 20%, 25%, 30%, 35%, and 40%) of waste-glass powder to the basic weight of cement (BWOC). After 7 days of curing, the CSs were recorded as 2973.28, 2103.05, 3176.33, 1812.98, 1958.01, 3770.99, 1425.30, 1485.71, 1547.27 psi for 0, 5, 10, 15, 20, 25, 30, 35, and 40% of waste-glass powder to the BWOC, respectively. Similarly, after 14 days of curing, the tested CSs were recorded as 3988.55, 2683.20, 3553.43, 3770.99, 3625.95, 4249.61, 3062.77, 3107.41, and 3165.79 psi for 0, 5, 10, 15, 20, 25, 30, 35, and 40% of waste-glass powder to the BWOC. Likewise, after 21 days of curing, the tested CSs were recorded as 4351.14, 4206.10, 4423.66, 4423.66, 4713.74, 4931.29, 4764.40, 4836.30, and 4920.13 psi for 0, 5, 10, 15, 20, 25, 30, 35, and 40% of waste- glass powder to the BWOC. This study concluded that waste-glass powder can be used as an additive for improving the CS of oilwell cement sheath. Mostly, at the optimal proportion of 25% of waste-glass powder replacement of the BWOC.