2016
DOI: 10.1021/acs.energyfuels.6b00782
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NMR Studies of the Effect of CO2 on Oilfield Emulsion Stability

Abstract: Formation of water-in-crude oil emulsions is a pervasive problem for crude oil production and transportation.Here we investigate the effectiveness of a comparatively low pressure CO 2 treatment in terms of breaking these water-in-crude oil emulsions. To this end, we used unique benchtop nuclear magnetic resonance (NMR) technology to measure the droplet size distribution (DSD) of the emulsions. Treatment with 50 bar CO 2 for 2 h resulted in significant emulsion destabilization; this was replicated when CO 2 was… Show more

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Cited by 18 publications
(29 citation statements)
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“…Over all practical experimental parameter space, the BGP method has been demonstrated to provide improved predictions of droplet radius a [39] compared to the SGP and GPD models. The consistency of this method was demonstrated in several previous studies [30,[45][46][47][48] and will be deployed in this work.…”
Section: Full Papersupporting
confidence: 58%
See 1 more Smart Citation
“…Over all practical experimental parameter space, the BGP method has been demonstrated to provide improved predictions of droplet radius a [39] compared to the SGP and GPD models. The consistency of this method was demonstrated in several previous studies [30,[45][46][47][48] and will be deployed in this work.…”
Section: Full Papersupporting
confidence: 58%
“…As demonstrated in the work of Hollingsworth and Johns [50], a generalized cross validation (GCV) method can be used to determine the required regularisation parameters. This regularisation approach to determine P(a) has been extensively used and validated in several previous studies [30,[45][46][47][48].…”
Section: Full Papermentioning
confidence: 99%
“…The degree of restriction on self‐diffusion experienced by the dispersed phase molecules is related to the droplet size; this phenomenon is exploited to determine the emulsion droplet size. The successful implementation of the pulsed field gradient technique for emulsion droplet sizing has been detailed in our previous explosive emulsion study [26] as well a number of previous publications concerning emulsions (e. g. [23–25, 34, 37–39]).…”
Section: Methodsmentioning
confidence: 99%
“…[29,30] This relatively novel technique is finding an interest in literature. [31][32][33][34] Douglass and McCall [17] and Stejskal and Tanner [35] proposed methods to measure free diffusion of molecules by PFG-NMR; Murday and Cotts [10] adapted this method to measure selfdiffusion of confined molecules. The signal attenuation, E, due to diffusion in spherical cavities of radius r is given by [10] ln E ( , g, Δ, r…”
Section: Inner Dsd Prediction By Pfg-nmrmentioning
confidence: 99%