Vol. 21 No. 2 (2023): Fuentes, el reventón energético
Articles

EVALUATION OF AN HPHT UNIT COUPLED WITH NIR PROBE TO DETERMINE ASPHALTENES PRECIPITATION ONSET UNDER DIFFERENT PRESSURES

Daniel Rezende da Silva
Universidade Federal do Rio de Janeiro, Instituto de Macromoléculas/LMCP, Rua Moniz Aragão, 360, bloco 8G/CT2, 21941-594, Rio de Janeiro, RJ, Brazil.
João Pedro Dias Capuchinho
Universidade Federal do Rio de Janeiro, Instituto de Macromoléculas/LMCP, Rua Moniz Aragão, 360, bloco 8G/CT2, 21941-594, Rio de Janeiro, RJ, Brazil.
Edilson Domingos da Silva
Universidade Federal do Rio de Janeiro, Instituto de Macromoléculas/LMCP, Rua Moniz Aragão, 360, bloco 8G/CT2, 21941-594, Rio de Janeiro, RJ, Brazil.
Daniela Hartmann
Universidade Federal do Rio de Janeiro, Programa de Engenharia Metalúrgica e de Materiais/COPPE/ LADPOL, Av. Horácio Macedo, 2030, bloco F, 21941-598, Rio de Janeiro, RJ, Brazil.
Marcia Cristina Khalil de Oliveira
Centro de Pesquisas da Petrobras, Av. Horácio Macedo, 950, 21941-915, Rio de Janeiro, RJ, Brazil.
Elizabete Fernandes Lucas
Universidade Federal do Rio de Janeiro, Programa de Engenharia Metalúrgica e de Materiais/COPPE/ LADPOL, Av. Horácio Macedo, 2030, bloco F, 21941-598, Rio de Janeiro, RJ, Brazil.

Published 2023-09-26

How to Cite

da Silva, D. R., Dias Capuchinho, J. P., da Silva, E. D., Hartmann, D., Khalil de Oliveira, M. C., & Fernandes Lucas, E. (2023). EVALUATION OF AN HPHT UNIT COUPLED WITH NIR PROBE TO DETERMINE ASPHALTENES PRECIPITATION ONSET UNDER DIFFERENT PRESSURES. Fuentes, El reventón energético, 21(2), 45–60. https://doi.org/10.18273/revfue.v21n2-2023004

Abstract

Asphaltenes are characterized as the crude oil fraction with the highest molar mass and polarity, presetting mainly (poly) aromatic groups. The flocculation and deposition of asphaltenes causes large losses to the oil industry. Understanding the phase behavior of asphaltenes under conditions closer to those found in reservoirs is important. Therefore, LMCP/UFRJ started operating a high-pressure high-temperature (HPHT) unit coupled to a near-infrared spectrometer probe that can use different flocculants. This work describes the development of a procedure as well as the validation of the results obtained from this unit. Due to the complex composition of crude oil, model systems (MS) were prepared with asphaltenes extracted with n-pentane (C5I) and n-heptane (C7I). The experiments were carried out at atmospheric pressure, titrated with n-heptane, and at 100 and 300 bar titrated with propane. As expected, C7I asphaltenes were more unstable, presenting lower precipitation onset than C5I asphaltenes under ambient conditions and higher pressures. However, for both MS, the stability increased with rising pressure when using propane as a solvent. The proposed method to evaluate asphaltenes precipitation onset was effective for MS in toluene and dead crude oil, and is a promising alternative for investigation of different types of crude oil.

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