Abstract
CO2/H2O intercalation causes changes in the elastic mechanical properties of clay. This phenomenon is critical to geologic carbon sequestration (GCS) and enhancing oil rate (EOR) via CO2 adsorption. In this work, the elastic stiffness and hydrostatic mechanical behavior of Na-montmorillonite (MMT) exposure to variable component of CO2/H2O mixture are investigated using combinations of Monte Carlo and Molecular Dynamic methods. In the hydrostatic test simulation of 1W and 2W hydrated state, volume and basal spacing d001 linearly decrease with the increasing hydrostatic pressure. Moreover, gradients of 1W hydrated state are smaller than that of the gradients of 2W hydrated state. The linear gradient is related to the elastic modulus. Therefore higher hydrated state results in softer structure. Additionally, the yielding bulk modulus linearly decreases with the pressure. The decreasing gradient almost keeps at a constant of 1.0GPa/GPa with variable component of CO2/H2O. At the super critical condition of CO2 (P=0.01GPa, T=304.5K), the elastic stiffness fluctuates with the variable component of H2O/CO2. CO2 intercalation strongly affects the out-of-plane elastic stiffness while has little influence on the in-plane stiffness.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
