Fly Ash Nanoparticle-Stabilized CO2-in-Water Foams for Gas Mobility Control Applications

Publication Date Sep 28, 2015


Abstract The goal of this work is to develop a novel way of beneficially utilizing two main waste products from coal power-generation plants – carbon dioxide and fly ash – by generating fly ash nanoparticle-stabilized CO2 foam for CO2 EOR mobility control. First, as the grain size of fly ash is generally too large for injection into reservoirs, it was reduced to nano-size by the ball-milling process. Second, dispersion stability analysis was performed to evaluate a suitable dispersing agent for fly ash nanoparticles (FA-NP). A range of surfactants (anionic, cationic, and non-ionic) was used in dilute concentrations. Surfactants were screened based on particle-hydrodynamic diameters and polydispersity index of the dispersion as measured by dynamic light scattering. Third, foam flow experiments were performed using combinations of FA-NP and various surfactants. Aqueous foam was created in-situ by coinjecting the FA-NP and/or surfactants with liquid CO2 through a sandpack at a fixed foam quality. Foam texture, as seen in the view-cell, was used to screen suitable surfactants that stabilized strong foams. Finally, the foam flow experiments were conducted in a Berea sandstone core. Pressure drop across the core was measured to estimate the achieved foam resistance factor and the apparent viscosity of the generated foam. Nano-milling and thermal treatment processes were able to yield thermally-treated fly ash (TTFA) nanoparticles with an average size of 180 nm. Dispersion stability analysis revealed that anionic and...

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Foam Flow Experiments
Fly Ash
Anionic Surfactant
Nanoparticles In Porous Media
Size Of Fly Ash
Fly Ash Nanoparticles
Dispersion Stability Analysis
Dilute Concentrations
Berea Sandstone Core
Absence Of Oil

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