The subject of CO2 subsurface storage security has never been more critical, and there is a need to explore the injection of functional materials that are capable of providing both conformance control and in situ CO2 adsorption, thereby improving overall formation storage integrity. Herein, a molecular dynamics simulation method was used to investigate the adsorptive tendency of two variants of interpenetrating network (IPN) composite materials comprising amine-stabilized hydrophobically modified cellulose sulphates and methylene bisacrylamide crosslinked polyacrylamide. Using the COMPASS III force field and Metropolis Monte Carlo, the diffusivity and adsorption isotherms for CO2 were determined in the IPN gels, respectively. The results indicate that the two interpenetrating networks D-I-AM-MBA-G-Cl and D-II-AM-MBA-G-Cl demonstrated reasonable CO2 adsorption. In saline conditions, the adsorption was further enhanced with diffusion coefficients of 4.87 × 10−4 cm2/s and 2 × 10−6 cm2/s. The adsorption isotherm of D-I-AM-MBA-G-Cl closely fits the Sips equation, with a regression coefficient of 0.9996, while that of D-II-AM-MBA-G-Cl follows the Temkin isotherm with an R2 value of 0.9885. This study revealed that carefully designed plugging agents with strong CO2 adsorption tendencies can aid in the improvement of the geosequestration integrity of subsurface formations.
Afolabi et al. (Mon,) studied this question.
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