Stability analysis of vertical boreholes using the Mogi–Coulomb failure criterion

Al-Ajmi, A.; Zimmerman, Robert W.

doi:10.1016/j.ijrmms.2006.04.001

Cited by 272 publications

(101 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Byerlee, 1978;Al-Ajmi and Zimmerman, 2006;Rutter and Glover, 2012). It assumes that failure occurs at particular combinations of the greatest and least principal stresses, that the intermediate principal stress has no effect on failure and that failure criteria can be set out in terms only of the stress state, without any consideration of the state of strain or the deformation mechanisms at work that lead to failure.…”

Section: Introductionmentioning

confidence: 99%

The Mohr–Coulomb criterion for intact rock strength and friction – a re-evaluation and consideration of failure under polyaxial stresses

Hackston

Rutter

2016

Solid Earth

View full text Add to dashboard Cite

Abstract. Darley Dale and Pennant sandstones were tested under conditions of both axisymmetric shortening and extension normal to bedding. These are the two extremes of loading under polyaxial stress conditions. Failure under generalized stress conditions can be predicted from the MohrCoulomb failure criterion under axisymmetric shortening conditions, provided the best form of polyaxial failure criterion is known. The sandstone data are best reconciled using the Mogi (1967) empirical criterion. Fault plane orientations produced vary greatly with respect to the maximum compressive stress direction in the two loading configurations. The normals to the Mohr-Coulomb failure envelopes do not predict the orientations of the fault planes eventually produced. Frictional sliding on variously inclined saw cuts and failure surfaces produced in intact rock samples was also investigated. Friction coefficient is not affected by fault plane orientation in a given loading configuration, but friction coefficients in extension were systematically lower than in compression for both rock types. Friction data for these and other porous sandstones accord well with the Byerlee (1978) generalization about rock friction being largely independent of rock type. For engineering and geodynamic modelling purposes, the stress-state-dependent friction coefficient should be used for sandstones, but it is not known to what extent this might apply to other rock types.

show abstract

Section: Introductionmentioning

confidence: 99%

The Mohr–Coulomb criterion for intact rock strength and friction – a re-evaluation and consideration of failure under polyaxial stresses

Hackston

Rutter

2016

Solid Earth

View full text Add to dashboard Cite

show abstract

“…4 when there is no P w , the effective tangential stress (σ θ ′) at the borehole wall is higher than σ r ′ and with increasing the distance from the borehole σ θ ′ decreases gradually. Failures of the borehole wall under these conditions have been documented by many researchers (Ewy and Cook, 1990a,b;Chang et al, 1997;Al-Ajmi and Zimmerman, 2006). Mavko and Jizba (1991) showed that if this situation is simulated in a laboratory model, the size of failed zones may be influenced not only by the final stress state but also by the stress path, strain rate and test boundary conditions.…”

Section: Drilling Site Investigationsmentioning

confidence: 95%

“…The most likely conditions at drilling fields are given by the first and second inequalities in Eq. (1) (Al-Ajmi and Zimmerman, 2006).…”

Section: Introductionmentioning

confidence: 99%

Shear failure analysis of a shallow depth unsupported borehole drilled through poorly cemented granular rock

Hashemi

Taheri

Melkoumian

2014

Engineering Geology

View full text Add to dashboard Cite

“…Shear failure will be generated when the Mohr's circle constituted by the maximum and minimum effective principal stress on the wellbore wall exceeds the shear strength; at this time, borehole collapse occurs. Generally, the Mohr-Coulomb strength criterion is selected to describe the shear failure as follows [39][40][41]:…”

Section: Concept For Moderate Collapse and Quantitative Evaluation Inmentioning

confidence: 99%

Moderate Collapse in a Shale Cap of a Nearly Depleted Reservoir

et al. 2017

View full text Add to dashboard Cite

Abstract:Reservoir depletion will cause the safe equivalent circulation density (ECD) operating window of drilling fluids to narrow, or even disappear. Previous studies have proposed a set of two specific casings at the top and bottom of the depleted reservoir, respectively, or conducted wellbore strengthening to increase fracture pressure, but these will cause a waste of time and costs, or differential pressure sticking. Aiming at resolving this problem, a novel concept and evaluation method of moderate collapse in the shale cap was developed and case calculations were performed. The results show that the degree of collapse is different for wells drilled in different types of fault regimes, and it can be controlled by optimizing the well trajectory. The collapse pressure within the shale cap was decreased due to reservoir depletion, and when a certain degree of collapse was acceptable, the collapse pressure can be even lower and a safe operating window will appear which can be beneficial to optimizing the casing program and drilling design. The research results provide a theoretical basis and new design idea for successfully and economically drilling into new untapped reservoirs in deeper horizons through depleted zones in the future.

show abstract

Stability analysis of vertical boreholes using the Mogi–Coulomb failure criterion

Cited by 272 publications

References 29 publications

The Mohr–Coulomb criterion for intact rock strength and friction – a re-evaluation and consideration of failure under polyaxial stresses

The Mohr–Coulomb criterion for intact rock strength and friction – a re-evaluation and consideration of failure under polyaxial stresses

Shear failure analysis of a shallow depth unsupported borehole drilled through poorly cemented granular rock

Moderate Collapse in a Shale Cap of a Nearly Depleted Reservoir

Contact Info

Product

Resources

About