Water-soluble carboxymethylchitosan as green scale inhibitor in oil wells.

Autor: Macedo RGMA; Laboratório de Pesquisa em Petróleo - LAPET, Instituto de Química, Universidade Federal do Rio Grande do Norte - UFRN, Natal, RN, Brazil., Marques NDN; Laboratório de Pesquisa em Petróleo - LAPET, Instituto de Química, Universidade Federal do Rio Grande do Norte - UFRN, Natal, RN, Brazil., Paulucci LCS; Laboratório de Pesquisa em Petróleo - LAPET, Instituto de Química, Universidade Federal do Rio Grande do Norte - UFRN, Natal, RN, Brazil., Cunha JVM; Laboratório de Pesquisa em Petróleo - LAPET, Instituto de Química, Universidade Federal do Rio Grande do Norte - UFRN, Natal, RN, Brazil., Villetti MA; Departamento de Física, Universidade Federal de Santa Maria - UFSM, Santa Maria, RS, Brazil., Castro BB; Centro de Pesquisa e Desenvolvimento Leopoldo Américo Miguêz de Mello - CENPES/PETROBRAS, Rio de Janeiro, RJ, Brazil., Balaban RC; Laboratório de Pesquisa em Petróleo - LAPET, Instituto de Química, Universidade Federal do Rio Grande do Norte - UFRN, Natal, RN, Brazil. Electronic address: balaban@supercabo.com.br.
Jazyk: angličtina
Zdroj: Carbohydrate polymers [Carbohydr Polym] 2019 Jul 01; Vol. 215, pp. 137-142. Date of Electronic Publication: 2019 Mar 25.
DOI: 10.1016/j.carbpol.2019.03.082
Abstrakt: A water-soluble carboxymethylchitosan (CMC) was prepared in water/isopropanol (2/8) medium, at 10 °C, and characterized by UV-vis, FT-IR and NMR techniques. Its performance as an environmentally friendly scale inhibitor in oil wells was evaluated under the physicochemical conditions of oil wells in northeast of Brazil, by using SEM, visual compatibility and dynamic tube blocking test. The synthesis conditions led to a degree of carboxymethylation of 0.45 and water-solubility in all pH range studied (1-11). CMC acted as a scale inhibitor of CaCO 3 under synthetic brine medium, presenting a minimum inhibitor concentration (MIC) of 170 ppm (1000 psi, T = 70 °C). SEM images showed that CaCO 3 crystals were deformed by CMC, which was attributed to effective interactions of CMC through its carboxylate ions and lone pair of electrons on OH and NH 2 groups with calcium ions, preventing scale deposition.
(Copyright © 2019 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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