Stable Silica Nanofluids of an Oilfield Polymer for Enhanced CO 2 Absorption for Oilfield Applications

Krishna Raghav Chaturvedi, Rakesh Kumar, Japan Trivedi, James J. Sheng, Tushar Sharma

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

CO 2 injected with water often gives premature breakthrough and reduces its absorption during sequestration and oil recovery applications. Water-soluble polymers are used to increase CO 2 absorption via an increase in water viscosity that restricts CO 2 movement and thus its early release. The efficacy of polymer CO 2 absorption methods can be further increased in the presence of nanoparticles (NPs) that interact with polymer chains and create a steric barrier to improve CO 2 absorption. Thus, nanofluids prepared with compatible NPs might be a safe and reliable method to improve CO 2 absorption of polymer methods. In this work, a nanofluid prepared with silica NPs (0.1-1.0 wt %) in base fluid of oilfield polymer [(polyacrylamide (PAM) with typical oilfield concentration (1000 ppm)] was tested for CO 2 absorption and compared with the one of PAM fluid at different temperatures (303 and 353 K). The inclusion of SiO 2 in PAM fluid provided stable nanofluids that exhibited good dispersion stability without NP settlement for days. Thus, the efficacy of PAM fluid CO 2 absorption significantly increased with nanofluids as reported through microscopic, kinetics, and molality results. The increase in NP concentration and temperature (353 K) showed an inverse relationship with CO 2 absorption in nanofluids, mainly due to enhanced NP aggregation; thus, the use of nanofluids for CO 2 absorption is critical at high temperature and high NP concentration. The NP effect on CO 2 stabilization and absorption is finally supported through UV-vis measurements. The study highlighted important aspects of CO 2 absorption and is a forward step toward the use of nanofluid together with the considerable possibility of enhanced CO 2 miscible oil recovery.

Original languageEnglish
Pages (from-to)12730-12741
Number of pages12
JournalEnergy and Fuels
Volume32
Issue number12
DOIs
StatePublished - Dec 20 2018

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