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Molecules 2018, 23(4), 860; doi:10.3390/molecules23040860

Application of Multiple Regression and Design of Experiments for Modelling the Effect of Monoethylene Glycol in the Calcium Carbonate Scaling Process

1
Instituto de Química, Pólo de Xistoquímica, Universidade Federal do Rio de Janeiro (UFRJ), Rua Hélio de Almeida 40, Cidade Universitária, Rio de Janeiro 21941-614, Brazil
2
Centro de Pesquisas e Desenvolvimento Leopoldo Américo Miguez de Mello, PETROBRAS, Cidade Universitária, Rio de Janeiro 21040-000, Brazil
*
Author to whom correspondence should be addressed.
Received: 22 December 2017 / Revised: 27 March 2018 / Accepted: 3 April 2018 / Published: 10 April 2018
(This article belongs to the Section Analytical Chemistry)
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Abstract

To avoid gas hydrate formation during oil and gas production, companies usually employ thermodynamic inhibitors consisting of hydroxyl compounds, such as monoethylene glycol (MEG). However, these inhibitors may cause other types of fouling during production such as inorganic salt deposits (scale). Calcium carbonate is one of the main scaling salts and is a great concern, especially for the new pre-salt wells being explored in Brazil. Hence, it is important to understand how using inhibitors to control gas hydrate formation may be interacting with the scale formation process. Multiple regression and design of experiments were used to mathematically model the calcium carbonate scaling process and its evolution in the presence of MEG. It was seen that MEG, although inducing the precipitation by increasing the supersaturation ratio, actually works as a scale inhibitor for calcium carbonate in concentrations over 40%. This effect was not due to changes in the viscosity, as suggested in the literature, but possibly to the binding of MEG to the CaCO3 particles’ surface. The interaction of the MEG inhibition effect with the system’s variables was also assessed, when temperature’ and calcium concentration were more relevant. View Full-Text
Keywords: calcium carbonate; gas hydrate; scale; monoethylene glycol; MEG; flow assurance calcium carbonate; gas hydrate; scale; monoethylene glycol; MEG; flow assurance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kartnaller, V.; Venâncio, F.; F. do Rosário, F.; Cajaiba, J. Application of Multiple Regression and Design of Experiments for Modelling the Effect of Monoethylene Glycol in the Calcium Carbonate Scaling Process. Molecules 2018, 23, 860.

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