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A new 3D stability model for the design of non-vertical wellbores
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- Al-Ajmi, Adel M. (author)
- KTH,Teknisk geologi och geofysik,Department of Petroleum and Chemical Engineering, Oman
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- Zimmerman, Robert W. (author)
- KTH,Teknisk geologi och geofysik
- (creator_code:org_t)
- 2006
- 2006
- English.
- Series: Proceedings of the 41st U.S. Rock Mechanics Symposium - ARMA's Golden Rocks 2006 - 50 Years of Rock Mechanics
- Conference paper (peer-reviewed)
Abstract
Subject headings
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- The Mohr-Coulomb failure criterion is known to be too conservative in estimating the critical mud pressure required to maintain wellbore stability, due to ignoring the strengthening effect of the intermediate principal stress. To eliminate this deficiency, we have developed a new analytical model to estimate the mud pressure required to avoid shear failure at the wall of non-vertical boreholes (i.e., the collapse pressure). This has been achieved by using a linear elastic and isotropic constitutive model for the stresses, and the Mogi-Coulomb criterion to predict failure. For comparison, the stability analysis has been also carried out using Mohr-Coulomb, the modified Lade criterion, and the Drucker-Prager criterion. We have found that implementing the Mogi-Coulomb law instead of Mohr-Coulomb does indeed lessen the conservative nature of the wellbore stability analysis. In general, the Mogi-Coulomb criterion gives an estimate of the collapse pressure that is similar to that given by the modified Lade criterion in polyaxial stress states, and similar to Mohr-Coulomb in triaxial stress states. By comparison, the Drucker-Prager criterion always underestimates the required mud weight. The developed 3D stability model has been applied in a field case study.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Naturresursteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Engineering (hsv//eng)
Keyword
- Analytical model
- Collapse pressure
- Coulomb criterion
- Coulomb law
- D stability
- Drucker-Prager
- Intermediate principal stress
- Linear elastic
- Mohr-Coulomb
- Mohr-Coulomb failure criterion
- Mud weights
- Polyaxial stress state
- Shear failure
- Stability analysis
- Strengthening effect
- Tri-axial stress state
- Vertical borehole
- Well bore
- Wellbore stability
- Wellbore stability analysis
- Boreholes
- Boring
- Oil field equipment
- Pressure effects
- Rock mechanics
- Rocks
- Stability
- Three dimensional
Publication and Content Type
- ref (subject category)
- kon (subject category)
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