... dynamic and static data from sub-surface formations. Use of cuttings and small samples can greatly improve the data availability, particularly where proper cores are not available. P. 23 wellbore integrity soft shale transducer exposure procedure anisotropy shale experiment deformation...

... ratios were approximately equal to corresponding applied stress ratios up 1.5, suggesting that, with a knowledge of one of the principal stresses, in regions of low stress anisotropy, stress can be calculated directly from strain. At stress ratios of 2 and above, corresponding relaxation strain ratios...

... Abstract In this paper the effects of borehole stress concentrations on both dipole flexural waves and azimuthally resolved, axially propagating compressional waves (i.e., microsonic) are studied. Dipole sonic logging tools provide the capability to measure acoustic anisotropy in the borehole...

... measurements are sensitive to dilatancy which appears later in the damage process of the studied limestone. P.187 propagation damage process catholique reservoir characterization engineering amplitude variation porosity anisotropy diagram upstream oil & gas quality factor ultrasonic...

... geomechanical characterization permeability anisotropy deformation well logging log analysis pore pressure drainage chalk reservoir compaction wellbore integrity overburden structural geology bedding strength property upstream oil & gas correlation mechanical properties fluid dynamics...

... Abstract Shales are highly anisotropic and are generally characterized by very low permeabilities. In this paper we report results of an experimental study of the relationship between elastic wave propagation anisotropy and permeability anisotropy of an illitic shale. Elastic wave velocity...

... Abstract Compressional wave anisotropy caused by a single fracture and three parallel fractures was measured using an acoustic imaging system. The measured compressional wave transmission coefficients are compared with theoretically predicted transmission coefficients from the displacement...

... stable wellbore condition. However, the extent to which the induced pore pressure influences wellbore stability varies dramatically with the in-situ stress regime, wellbore trajectory, and the poroelastic and strength anisotropies of the shale. This paper examines wellbore stability under different...

... is at least an order of magnitude better than in conventional techniques. geophy anisotropy crustal rock wide range hydrocarbon shear-wave splitting schematic illustration crampin uniwell configuration production process reservoir characterization reflection production front interface...

... compressibility geologist geology piston rupture anisotropy Introduction A true triaxial cell for testing at reservoir pressures has been developed by the Danish Geotechnical Institute (DGI) over the past six years. The initial concept for the cell was based on the true triaxial cell constructed...

... the importance of mechanical and hydraulic interactions between wells, and of the characteristics of natural fractures. orientation field case field data conductivity heffer contour enhanced recovery anisotropy natural fracture upstream oil & gas permeability reservoir characterization...

... to the damage seen in the wellbore experiments. reservoir geomechanics experiment variability upstream oil & gas aspect ratio damage zone borehole shale evolution orientation anisotropy bedding plane pierre shale rock mechanics wellbore axis axis bedding plane normal geology...

... annular pressure drilling borehole geologist europe government partir geological subdiscipline deformation accuracy forage etd north sea information inversion qui estime anisotropy tampen spur INTRODUCTION The faulting and jointing, the basins and mountain ranges were formed...

... rather than active faulting. The orientation of the in-situ stress was determined from shear acoustic anisotropy measurements on cores from 5 wells and from wellbore elongation measurements in 13 wells. The two methods show very similar orientations within the same fault block. No statistical...