Erro variável para modelos especiais que descrevem a transição frágil-dúctil Variável de erro para modelos especiais

• Orlando Zambrano Mendoza Escuela de Ingeniería de Petróleo. Facultad de Ingeniería, Universidad del Zulia, Apartado postal 4011-A-526. Maracaibo, Zulia, Venezuela.
• Peter P. Valko Harold Vance Department of Petroleum Engineering Texas A&M University 3116 TAMU College Station, TX 77843-3116
• James E. Russell Harold Vance Department of Petroleum Engineering Texas A&M University 3116 TAMU College Station, TX 77843-3116

DOI: https://doi.org/10.22209/rt.uv4705

Resumo

Este artigo mostra a aplicação da metodologia baseada no método error in variables (EIV) para ajustar o envelope no plano das principais tensões efetivas, considerando o envelope e descrevendo a transição frágil-dúctil e o colapso dos poros (modelo cap). As equações paramétricas do envelope de rutura foram obtidas através da introdução do conceito de elasticidade dos poros de Biot, representando o estado de tensões pela tensão efetiva média e pela tensão equivalente. Uma forma algébrica não linear representa as equações do envelope, delimitando a região de transição frágil a dúctil do envelope de quebra ou rendimento. Para ilustrar a aplicação desta metodologia, foram utilizadas as informações de resistência frágil e tensão de rendimento à compactação para o arenito de Bentheim e as tensões principais normalizadas para dez arenitos diferentes, nas quais o comportamento de transição frágil para dúctil é descrito. Os resultados mostram que o método EIV fornece uma maneira simples de obter a representação paramétrica do envelope no plano de tensão efetivo principal, descrevendo o mecanismo de deformação da rocha testada que envolve o efeito de colapso dos poros.

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