What question did this study set out to answer?

The study aims to optimize Class G cement formulations using fly ash and eggshell blends for improved CO2 storage integrity.

June 1, 2026ACS OmegaOpen Access

Optimizing Class G Cement for CO 2 Storage (CCS): A Comprehensive Study on the Effects of Fly Ash and Eggshell Blends on Wellbore Cement Integrity

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Randomized trial optimizes cement integrity in CO2 environments, suggesting enhanced carbon storage safety.

The study aims to optimize Class G cement formulations using fly ash and eggshell blends for improved CO2 storage integrity.
Cement formulations included base cement, FA/ESP (75%/25%), and FA/ESP (50%/50%).
Conditions involved high-pressure aging (2000 psi, 170 °C) in CO2-saturated brine for 60 days.
Characterization techniques used included Nuclear Magnetic Resonance, ultrasonic wave propagation, X-ray diffraction, and Scanning Electron Microscopy.
FA/ESP (75%/25%) formulation reduced permeability by 75% (0.01125 mD vs 0.045 mD for base cement) and decreased porosity by 82.22%.
Mechanical properties showed a 19.5% increase in Young’s modulus and a 19.3% increase in Poisson’s ratio, indicating improved structural strength.
Mineralogical analysis confirmed CO2 mineralization with calcite formation increasing from 46.4% to 56.5%.

Aluah et al. (2026) studied this question.

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