Skip to Main content Skip to Navigation
Theses

Etude du comportement du grès rouge de Wildmoor. Application à l'analyse de stabilité d'un forage pétrolier en cours de creusement et de production

Abstract : This study concerns the mechanical behaviour and the failure conditions of a reservoir rock (red Wildmoor sandstone). Several stress paths, in axisymetric conditions (uniaxial and triaxial compression tests, extension tests), have allowed to characterize the constitutive behaviour of the rock. The material damage is quantified through triaxial compression tests with loading and unloading cycles. The constitutive law developed takes into account the stress and damage dependency of the elastic parameters. The plastic behaviour of the rock is described by a non-linear Mohr-Coulomb criteria which takes into account the pressure dependency of the plastic parameters (friction and dilatancy coefficients). It involves an isotropic friction hardening phase and a kinematic cohesion softening one. This constitutive model is extended to non-coaxial plasticity theory for appropriate prediction of strain localization. Borehole stability during the drilling phase and the production phase is studied. This involves the development of a code to compute the stress field around the borehole during drilling and oil production. The study of the occurence of various instability modes (shear band formation, surface instability) has shown prominentely the influence of the dilatancy of the rock, the depth of the borehole and the pressure gradient applied at the borehole wall during production.
Complete list of metadatas

Cited literature [35 references]  Display  Hide  Download

https://pastel.archives-ouvertes.fr/tel-00523152
Contributor : Ecole Des Ponts Paristech <>
Submitted on : Monday, October 4, 2010 - 2:32:41 PM
Last modification on : Wednesday, November 29, 2017 - 9:52:29 AM
Long-term archiving on: : Wednesday, January 5, 2011 - 3:02:55 AM

File

1996TH_OULAHNA_A_NS20418.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : tel-00523152, version 1

Collections

Citation

Ahmed Oulahna. Etude du comportement du grès rouge de Wildmoor. Application à l'analyse de stabilité d'un forage pétrolier en cours de creusement et de production. Mécanique [physics.med-ph]. Ecole Nationale des Ponts et Chaussées, 1996. Français. ⟨tel-00523152⟩

Share

Metrics

Record views

567

Files downloads

1953