![]() Fly-ash-based geopolymer cement samples, with the addition of slag cement as a strength enhancer, were prepared by using an elastomeric expandable additive (R-additive), which consists of styrene–butadiene rubber with a specific gravity of 0.945, at concentrations of 10%, 15%, 20% and 25% by weight of the solid blend, and cured in a water bath at 60 ☌ and atmospheric pressure, and a curing chamber at 90 ☌ and 3000 psi, or approximately 20.68 MPa. ![]() The present study aimed to investigate the effect of an expandable additive on the compressive strength and linear expansion of geopolymer cement, which is an alternative to ordinary Portland cement, for oil-well cementing. Therefore, any substance or material blended with powdered Portland oil well cement during manufacturing, to formulate cement slurry, or any substance or material dispersed into cement slurry, to improve the desired oil well CS can be described as cement sheath strength developing chemical additive. During the process of cement slurry placement, setting and hardening, including the usage of the wellbore, both the cement slurry and cement sheath encounter hash subsurface conditions (Igbani et al., 2020 Zeng et al., 2019 Bello, 2014).These harsh conditions include the permafrost temperature in the Artic zone, which is below freezing 32 0 F (0 0 C) deep oil wells of temperature up to 500 0 F steam wellbore of temperatures between 450 0 and 500 0 F fireflood or geothermal wellbores of temperatures between 1500 0 F pressures of between atmospheric and 30,000psi anthropogenic effects of thermal enhanced oil recovery, just to mention a few (Broni-Bediakoet al., 2016).These hash subsurface conditions tending to alter the desired cement sheath CS development were contained using additives or admixtures (Broni-Bediakoet al., 2016 Ogbonna, 2009). ![]() Cement CS and w/c (Dinakaret al., 2013).Cement Sheath Compressive Strength Additives:In the upstream petroleum industry, primary oil well cementing involves the design of cement slurry, placement of the designed cement slurry within a specific period into the desired annular-space or annulus and depth, allowing the slurry to set and hardened. ![]() Effect of w/c on the fresh and hardened properties of self-compacting concrete (Felekoğluet al., 2007) Fig 2. ![]()
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