Equilíbrio e vibrações induzidas por vórtices de "risers" de perfuração

• Ano de defesa: 1980
• Autor(a) principal: Farias, Francisco Mourão
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Rio de Janeiro; Brasil; Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia; Programa de Pós-Graduação em Engenharia Mecânica; UFRJ
• Palavras-chave em Português: Vórtices dos fluídos; Perfuração de poços; Estruturas offshore; Petróleo; CNPQ::ENGENHARIAS::ENGENHARIA MECANICA::FENOMENOS DE TRANSPORTE::MECANICA DOS FLUIDOS
• Link de acesso: http://hdl.handle.net/11422/3622

Presents a study about drilling risers used by semisubmersible platforms in order to drill wells in deep waters. Firstly, a study about static equilibrium is presented. This allows to select adequate risers for places with usual natural conditions. The selection takes into account the riser tension, the natural ·conditions and the pertinent drilling parameters. Then, a brief study about free vibrations is presented. Finally, the analysis of transverse vibrations induced by vortex-shedding is dane. These vibrations can occur in places of strong marine currents. The mathematical model was postulated by Skop and Griffin and its solution was dane by the normal form method. The proposed method allows the construction of the riser frequency response near a resonance condition.