Experimental Study of Wellbore Instability in Clays
Identifieur interne : 000566 ( Main/Curation ); précédent : 000565; suivant : 000567Experimental Study of Wellbore Instability in Clays
Auteurs : Naeem O. Abdulhadi [Jordanie] ; John T. Germaine [États-Unis] ; Andrew J. Whittle [États-Unis]Source :
- Journal of geotechnical and geoenvironmental engineering [ 1090-0241 ] ; 2011.
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- Pascal (Inist)
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- KwdEn :
Abstract
This paper presents the results of an extensive program of laboratory model wellbore tests that have been performed to study wellbore instability in saturated clays. The tests were conducted on resedimented Boston blue clay (RBBC) anisotropically consolidated to vertical effective stresses up to 10 MPa by using two custom-built thick-walled cylinder (TWC) devices with outer diameters Do = 7.6 and 15.2 cm. The experimental program investigated the effects of specimen geometry, mode of loading, strain rate, consolidation stress level, and overconsolidation ratio (OCR) on deformations of the model wellbore measured during undrained shearing. Results indicate that for normally consolidated clays most of the change in cavity pressure occurs at volumetric strains less than 5% after which the borehole becomes unstable. Increases in outer diameter and strain rate led to a reduction in the minimum borehole pressure. Stress-strain properties were interpreted by using an analysis procedure originally developed for undrained plane strain expansion of hollow cylinders. The backfigured undrained strength ratios from these analyses for normally consolidated specimens range from su/σ'vc = 0.19-0.22. Overconsolidation greatly improves the stability of the borehole, and interpreted undrained strength ratios from the TWC tests are consistent with well-known power law functions previously developed for elemental shear tests.
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Pascal:11-0382151Le document en format XML
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Borehole</term>
<term>Clay</term>
<term>Consolidation</term>
<term>Experimental study</term>
<term>Geometry</term>
<term>Instability</term>
<term>Laboratory test</term>
<term>Model test</term>
<term>Saturated soil</term>
<term>Shear strength</term>
<term>Soil test</term>
<term>Stress strain relation</term>
<term>Thick wall</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Essai sol</term>
<term>Argile</term>
<term>Trou forage</term>
<term>Etude expérimentale</term>
<term>Essai laboratoire</term>
<term>Essai sur modèle</term>
<term>Sol saturé</term>
<term>Résistance cisaillement</term>
<term>Instabilité</term>
<term>Paroi épaisse</term>
<term>Géométrie</term>
<term>Relation contrainte déformation</term>
<term>Consolidation</term>
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<front><div type="abstract" xml:lang="en">This paper presents the results of an extensive program of laboratory model wellbore tests that have been performed to study wellbore instability in saturated clays. The tests were conducted on resedimented Boston blue clay (RBBC) anisotropically consolidated to vertical effective stresses up to 10 MPa by using two custom-built thick-walled cylinder (TWC) devices with outer diameters D<sub>o</sub>
= 7.6 and 15.2 cm. The experimental program investigated the effects of specimen geometry, mode of loading, strain rate, consolidation stress level, and overconsolidation ratio (OCR) on deformations of the model wellbore measured during undrained shearing. Results indicate that for normally consolidated clays most of the change in cavity pressure occurs at volumetric strains less than 5% after which the borehole becomes unstable. Increases in outer diameter and strain rate led to a reduction in the minimum borehole pressure. Stress-strain properties were interpreted by using an analysis procedure originally developed for undrained plane strain expansion of hollow cylinders. The backfigured undrained strength ratios from these analyses for normally consolidated specimens range from s<sub>u</sub>
/σ'<sub>vc</sub>
= 0.19-0.22. Overconsolidation greatly improves the stability of the borehole, and interpreted undrained strength ratios from the TWC tests are consistent with well-known power law functions previously developed for elemental shear tests.</div>
</front>
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