... Wellbore Design discretization instability rock mass grid wellbore integrity Upstream Oil & Gas trajectory mechanical property information borehole instability geometry zone size salt diapir Drilling Reservoir Characterization diapirism diapir Mungo field in-situ stress...

... reservoir simulation consistency parameter invariant bifurcation analysis continuous traction Upstream Oil & Gas strong discontinuity bifurcation condition instability traction cap plasticity model constitutive model deformation discontinuous bifurcation discontinuity weak...

... Reservoir Characterization Energy Economics reservoir geomechanics drilling fluid chemistry drilling fluid selection and formulation shale gas Wellbore Design shale oil complex reservoir Upstream Oil & Gas pore pressure flow in porous media instability membrane efficiency...

... Artificial Intelligence reservoir depletion assumption Reservoir Characterization depletion Upstream Oil & Gas reservoir geomechanics pore pressure stability boundary perturbation reservoir boundary reverse fault fault inclination fault stability reservoir instability fault...

... ABSTRACT ABSTRACT: The Montana Tunnels Mine was mined out to a depth of 900 feet at the end of 1999. The first signs of instability were recognized in 1996 along the upper slope area of the northwest sector when the pit was mined out to a depth of approximately 500 feet. To extend the life...

... number of slaking cycles. Upstream Oil & Gas Korea rock slope granitic gneiss durability index criteria sandstone instability weathered rock slope stability Indicator Reservoir Characterization durability slake durability index stability sample jg-2 gneissosity slope...

... are depicted in the legend below: 321 rJ v o [J t n LikaYfega1 d irS<tility M3c:Iwica p-q:> Mre~e Pa:k (Carp::eite a ScM tin1J9" rra: pDQ Bagate p-q:> FnH;iressaije rmchrica p-q:> I-I,<talic p-q:> (20) 1«400 kN) As can be seen in Figure 5, instability of the hangingwall is likely to occur, irrespective...

... and to predict the occurrence of a rock failure shock or instability. Lockner and Byerlee (1992), for example, draw upon laboratory results concerning the nucleation and growth of shear fractures in brittle rock. With AE monitoring, they have tracked the fault growth in granite sample, and have used...

... arrangement of their faces relative to the prevailing acceleration field. Some block types are inherently unstable (eg. free-falling blocks in a gravitational field). Other shapes give rise to possible single plane, double plane and multiple plane instability behaviour modes which depend on the block size...

... ABSTRACT: In a drilling/production operating environment, wellbore instabilities arise in all three stages of a wells life span: drilling, stimulation and production phases. The timing and severity of the occurrence of such borehole problems dictate which method of stability analysis should...

... ABSTRACT: Drilling represents a significant portion of exploration and development costs in petroleum engineering. In many cases, borehole instability related problems may cause drilling to become extremely expensive. Traditional wisdom in drilling engineering often relies from experience...

...); and (3) propagation of pre-existing randomly oriented micro-cracks that result in spalling or borehole breakout (small scale). For each of the failure types 2-D models of the mechanisms of borehole instability have been developed. In the case of a near-by fault, the extent of its slip essentially depends...

... by the fact that rocks in the vicinity of the reef have been subsequently altered, significantly reducing cohesion across surfaces and discontinuities. Platinum and chrome mines in the Bushveld Complex, at shallow to intermediate depths, experience instability problems of stope hangingwalls and to a lesser...