... deviatoric stress and hence greater potential for borehole instability. The model can be useful in borehole failure risk assessment with a potential to improve drilling efficiency, reduce downtime, etc. by planning the boreholes so that their trajectories avoid the areas of high risk as much as practicable...

... be observed at all stages of deformation, such as in the Kungurian Salt in the Pre-Caspian Basin. Upstream Oil & Gas structural geology Reservoir Characterization circulation salt dome stress state fracture gradient salt tongue shale strata stress regime trajectory emplacement...

... centerline trajectory shear strain specimen Upstream Oil & Gas Rudnicki Simulation platen sample-platen interface localization MPa stress state configuration interface deformation homogeneous deformation Pacific Rocks 2000, Girard, Liebrnan, Breeds & Doe (eds) O 2000 Balkerna, Rotterdam...

... study of the stress trajectories. Comparison of the analytical prediction of the fracture path with the computed path using a numerical technique shows excellent agreement between the two methods. 1 INTRODUCTION It has recently been recognized that a hydraulic fracture could be deviated from its trivial...

... of confining pressure on the fracture trajectory. COD 60 Diztxibute. d load COD 6 Width Figure 1. Edge Cleavage Specimen (ECS) for bi-axial testing. Figure 2. (A) Experimental setup ofbi-axial oading frame, and (B) post-test ECS specimen. 1270 Confining pressure I I I I I I I I I i i I Figure 3. Stress...

... trajectory new approach variation cutting process penetration phase doctoral dissertation paris fontainebleau instantaneous behavior variogramme experimental result maximal value interaction application primary function Rock Mechanics, Nelson & Laubach (eds) © 1994 Balkema, Rotterdam, ISBN 90...

... of the weakness of the stress signature. However, it is shown that the use of visual analyses of the data using trajectory and polar plots highlights reliable data. A general NE-SW maximum horizontal principal stress orientation was obtained for the region. Reservoir Characterization orientation...