skip to main content

Study of the influence of offshore drulling rigs heave motions in drillstrings dynamic behavior.

Santos, Nicolau Oyhenard Dos

Biblioteca Digital de Teses e Dissertações da USP; Universidade de São Paulo; Escola Politécnica 2018-10-03

Acesso online. A biblioteca também possui exemplares impressos.

  • Título:
    Study of the influence of offshore drulling rigs heave motions in drillstrings dynamic behavior.
  • Autor: Santos, Nicolau Oyhenard Dos
  • Orientador: Carrion, Ronaldo
  • Assuntos: Cisalhamento; Colunas De Perfuração; Método Dos Elementos Finitos; Vibrações; Drillstring; Dynamic; Finite Element; Heave; Vibration
  • Notas: Dissertação (Mestrado)
  • Notas Locais: Programa Engenharia Mineral
  • Descrição: The price of crude oil is a major concern for oil companies nowadays, maintaining costs in deepwater drilling activities is of utmost importance. The contribution of the heave movement from oating platforms to the vibrations of drillstrings is still a subject not fully appreciated in the literature. This work deals with the dynamic behavior of the drillstring through nite element analysis (FEA) when an oscillating axial displacement at the top is applied. Numerous drillstring models were generated using two-dimensional beam elements that have degrees of freedom for the axial, shear, bending, and torsion types of displacement. The models incorporated an axial displacement at the top of a vertical drillstring set at the bottom. Natural frequencies were obtained for all degrees of freedom considering diferent heave scenarios. The variation in the normal forces distribution due to the inertia efect on the entire structure caused a change in the stillness for shear and bending degrees of freedom. The variation of natural frequencies related to shear were obtained. In addition, the displacement of the neutral point in the drill column was obtained. The results presented here should contribute to future research on complex dynamic behavior of drillstrings.
  • DOI: 10.11606/D.3.2019.tde-12122018-074029
  • Editor: Biblioteca Digital de Teses e Dissertações da USP; Universidade de São Paulo; Escola Politécnica
  • Data de publicação: 2018-10-03
  • Formato: Adobe PDF
  • Idioma: Inglês

Buscando em bases de dados remotas. Favor aguardar.