Propostas de continuação
do trabalho
147
Como propostas de continuação deste trabalho, listam-se:
1. Simular termodinamicamente os casos em que houve precipitação de asfaltenos. A modelagem termodinâmica permite construir o envelope de fases dos asfaltenos nas condições de interesse, a partir do ajuste das curvas simuladas com um número reduzido de dados experimentais de precipitação dessa fração. Desenvolver equações de estado com termos associativos para modelar a precipitação dos asfaltenos.
2. Desenvolver modelagem molecular com compostos modelo de asfaltenos para elucidar o mecanismo de formação de agregados, visando o desenvolvimento de processos para evitar a precipitação da fração asfaltênica nos sistemas de produção de petróleo.
3. Coletar amostras de asfaltenos precipitados a partir de óleos vivos por despressurização isotérmica e compará-los quimicamente aos asfaltenos extraídos de óleo morto com n-heptano e outros n-alcanos. Investir na utilização de técnicas ambientais de ionização (DART, DESI, LTP, EASI) para avaliar os asfaltenos através de espectrometria de massas, não necessitando de preparação prévia das amostras.
4. Utilizar o aparato do ressonador de cristal de quartzo (RCQ) para avaliar a eficiência de inibidores químicos de deposição de asfaltenos. Implementar experimentos na RCQ capazes de quantificar o depósito aderido sobre o sensor piezoelétrico, de forma a criar uma classificação de óleos em relação ao risco de deposição de asfaltenos. Também com a RCQ, estudar o efeito de revestimentos antiaderentes, com vistas à minimização de deposição.
5. Validar os resultados obtidos para os óleos vivos nos testes de despressurização isotérmica realizados com o microscópio de alta pressão com os possíveis problemas de deposição de asfaltenos encontrados no campo. Tal validação criará um banco de dados de poços problemáticos à deposição de asfaltenos e permitirá desenvolver correlações entre a estabilidade dos asfaltenos e as características dos óleos, mortos e vivos, que promoveriam a deposição dessa fração ao longo do sistema de produção de petróleo.
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