Calculation of scale thickness in oil pipelines using transmission gamma
DOI:
https://doi.org/10.15392/bjrs.v8i3B.412Keywords:
transmission gamma, scale, MCNP-X code, oil pipelinesAbstract
As incrustações podem ser definidas como compostos químicos inorgânicos, inicialmente insolúveis, e que se precipitam se acumulam na parede interna de tubos, equipamentos de superfície e / ou partes de componentes envolvidos na produção e transporte de petróleo. Esses compostos, ao precipitarem, causam problemas na indústria do petróleo e consequentemente resultam em perdas na otimização do processo de extração. Apesar da importância e do impacto da precipitação desses compostos no âmbito tecnológico e econômico, ainda existe a dificuldade em determinar métodos que possibilitem a identificação e quantificação da escala em um estágio inicial. O uso da técnica de transmissão gama pode fornecer subsídios para um melhor entendimento da deposição desses compostos, tornando-o uma ferramenta adequada para a determinação não invasiva de sua deposição em dutos de transporte de petróleo. A geometria usada para a detecção de incrustações inclui um tubo de aço de 280 mm de diâmetro contendo escama de sulfureto de bário (BaSO4 ) variando de 5 a 60 mm, uma fonte de radiação gama com feixe divergente e como detector de cintilação NaI (Tl) 2x2 ”. O tamanho da abertura do feixe colimado foi avaliado (2 a 7 mm) para também quantificar o erro associado no cálculo da escala. O estudo foi realizado com simulação computacional, utilizando o código MCNP-X e validado por meio de equações analíticas que indicam a possibilidade de utilização deste estudo para este fim.
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