388411 Nanoparticle Stabilized High Internal Phase CO2-in-Water Foams: Effects of Surfactants and Polymers

Monday, November 17, 2014: 10:24 AM
M301 (Marriott Marquis Atlanta)
Zheng Xue1, Andrew Worthen1, Chun Huh2, Steven Bryant3 and Keith P. Johnston4, (1)Chemical Engineering, University of Texas at Austin, Austin, TX, (2)Petroleum and Geosystems Engineering, The University of Texas, Austin, TX, (3)petroleum and geosystem engineering, University of Texas at Austin, austin, TX, (4)Department of Chemical Engineering, The University of Texas at Austin, Austin, TX

Chemical formulations of nanoparticles and surfactants are developed to stabilize high internal phase carbon dioxide-in-water (C/W) foams for low water hydraulic fracturing fluids. Silica nanoparticles and low concentrations of surfactants that weakly interact with nanoparticles were used to stabilize the C/W foams. The surfactants are adsorbed onto the nanoparticles to influence the contact angle of the nanoparticles to stabilize the dispersed CO2 phase droplets against coalescence. Also, the free surfactants reduce the interfacial tension between the aqueous phase and CO2 phase to facilitate the break-up of the CO2 phase into bubbles. The ability to achieve stable high internal phase C/W foams with properly designed nanoparticles could offer an alternative to conventional surfactants to raise the foam stability to be adequate for hydraulic fracturing operations. Further, water-soluble polymers were demonstrated to greatly improve the viscosities of the C/W foams. The ability to generate viscous fluids with low amounts of water for fracturing of shale reservoirs is of great interest for both reducing global water utilization and mitigation of post-processing of contaminated fracturing fluids.

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See more of this Session: Unconventionals: Shale Oil Upstream and Downstream
See more of this Group/Topical: Fuels and Petrochemicals Division