Petroleum ChemistryPetroleum ChemistryНефтехимия0028-24213034-5626The Russian Academy of Sciences65559810.31857/S0028242123040068OJHBQAArticlesСтатьиResearch ArticleInfluence of Demulsifier Aging on Its Performance in Heavy Oil Synthetic EmulsionsВлияние старения деэмульгатора на его характеристики в синтетических эмульсиях тяжелой нефтиNunesRita De Cassia P.redpessanha@gmail.comSilvaCarla Michele F.petrochem@ips.ac.ruRochaPaulo Cristiano S.petrochem@ips.ac.ruLucasElizabete F.petrochem@ips.ac.ruUniversidade Federal do Rio de Janeiro, Instituto de Macromoléculas, Laboratório de Macromoléculas e Coloides na Indústria do PetróleoUniversidade Federal do Rio de Janeiro, Instituto de Macromol�culasUniversidade Federal do Rio de Janeiro, COPPE, Programa de Engenharia Metalúrgica e de Materiais, Laboratório de Aditivos Poliméricos para Produção de PetróleoUniversidade Federal do Rio de Janeiro, COPPE15072023634NO4 (2023)№4 (2023)51652311022025Copyright ©; 2023, Russian Academy of SciencesCopyright ©; 2023, Российская академия наук2023Russian Academy of SciencesРоссийская академия наукhttps://journals.eco-vector.com/0028-2421/article/view/655598

Flow assurance is one of the main challenges in the oil industry. Many factors can affect the oil fluidity, including the oil °API and the formation of water-in-oil (w/o) emulsions that increase the fluid viscosity. The demulsification process aims to decrease as much as possible the water content in the crude oil. Chemical products known as demulsifiers can be used to aid in this process. In laboratory, the chemicals can be evaluated under temperature and water content conditions similar to those in the oil field. In this work, the effect of demulsifier aging on its performance, simulating oil field storage, was evaluated using synthetic w/o emulsion prepared with a heavy crude oil and brine at 55 000 ppm. The crude oil was characterized and some demulsifier properties were measured along the time. The crude oil was identified as a heavy oil containing 11.6% of asphaltenes, contributing to the w/o emulsion stability. The demulsifier performance increased with aging time, and the results strongly suggested that a mere evaporation of the additive solvent occurs, concentrating its active matter

Оценивалось влияние старения деэмульгатора на его характеристики, моделирующее хранение нефти на месторождениях, с использованием синтетической эмульсии вода/нефть, приготовленной из тяжелой нефти и минерализованной пластовой воды при концентрации 55 000 ppm. Были определены характеристики нефти и исследованы некоторые свойства деэмульгатора. Нефть, содержащая 11.6% асфальтенов, идентифицировалась как тяжелая, что способствует стабильности эмульсии вода/нефть. Эффективность деэмульгатора увеличивалась со временем старения, результаты свидетельствовали о том, что происходит простое испарение растворителя-добавки, концентрирующее его активное вещество.

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