Skip to Main content Skip to Navigation
Theses

Dissociation des bouchons d'hydrates de gaz dans les conduites pétrolières sous-marines

Abstract : Natural gas hydrates plugs cause problems during drilling, well operations, production, transportation and processing of oil and gas. Especially, it is a very serious problem in off-shore oil transportation where low temperature and high pressure become more and more favourable to gas hydrate formation as the new production wells are more and more deeper. Up to now, although many studies have been developed concerning the possibility of preventing pipe plugging, there is limited information in open literature on hydrate plugs dissociation and all models in literature are numerically complicated.

In this study, hydrate plugs are formed from water in n-dodecane mixture with addition of a dispersant E102B in two different experimental apparatus in order to obtain hydrates plugs with different sizes (diameter of 7, 10.75 and 12 cm). Then, the plugs are dissociated by the method of two-sided depressurisation. In this paper, we propose a numerical model which describes the dissociation of gas hydrate plugs in pipelines. The numerical model, which is constructed for cylindrical coordinates and for two-sided pressurisation, is based on enthalpy method. We present also an approximate analytical model which has an average error 2.7 % in comparison with the numerical model. The excellent agreement between our experimental results, literature data and the two models shows that the models give a good prediction independently of the pipeline diameter, plug porosity and gas. The simplicity of the analytical model will make it easier in industrial applications.
Complete list of metadata

Cited literature [2 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00009985
Contributor : Andrée-Aimée Toucas <>
Submitted on : Friday, August 26, 2005 - 11:16:44 AM
Last modification on : Wednesday, June 24, 2020 - 4:18:31 PM
Long-term archiving on: : Tuesday, September 7, 2010 - 5:14:29 PM

Identifiers

  • HAL Id : tel-00009985, version 1

Citation

Duc Nguyen Hong. Dissociation des bouchons d'hydrates de gaz dans les conduites pétrolières sous-marines. Matériaux. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2005. Français. ⟨tel-00009985⟩

Share

Metrics

Record views

552

Files downloads

1545