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Etude expérimentale du comportement hydro-mécanique d'une
roche poreuse en relation avec les problèmes d'excavation

Abstract : In the oil and gas industry, it has been estimated that in excess of US$ 500 millions [7] is lost
each year because of wellbore instability. To prevent problems due to wellbore instability,
accurate prediction of stress and deformation around the wellbore are essential. Laboratory
tests on thick-walled hollow cylinders of rock are a relatively easy, economical and realistic
means to better understand the mechanisms associated to wellbore failure.
The first part of this research consisted in the development of an experimental device to carry
out tests on thick-walled hollow cylinders under two distinct conditions:
1) Tests without pore fluid (to simulate the underground opening during and after the
drilling).
2) Tests with convergent radial flow of pore fluid (to simulate the wellbore during its
phase of production). The latter is one of the key advantages of this experimental device
since this possibility of radial flow does not exist in the majority of studies reported in the
literature.
The second part of this research discusses the experiments carried out on the rock-like
ceramic material called CPIR09. The behaviour of this material is similar to very porous
sandstones which form certain oil reservoirs. The mode of rupture observed in the tests was a
pair of radial rupture planes that are diametrically opposed (parallel with the axis of the hole
and perpendicular to the internal wall) which corresponds to a compacting failure mechanism.
The results obtained show that the global permeability decreases with increasing external
pressure. The convergent radial flow of pore fluid does not affect the form of the rupture but
acts to remove fractured materials to erode localization bands. The convergent radial flow of
pore fluid (due to the imposed pore pressure) may slightly decrease the strength of the samples.
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Submitted on : Sunday, July 9, 2006 - 8:19:24 AM
Last modification on : Friday, November 6, 2020 - 3:52:33 AM
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Mehdi Hosseini. Etude expérimentale du comportement hydro-mécanique d'une
roche poreuse en relation avec les problèmes d'excavation. Sciences de l'ingénieur [physics]. Université Joseph-Fourier - Grenoble I, 2005. Français. ⟨tel-00084656⟩

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