... was determined for each simulation. The micro parameters used during the parametric study are were based on the Lac Du Bonnet Granite and given in Table 1. Table 1:Micro-parameters inPFC to representLac duBon- net granite. Ec 49 GPa E¯c 49 GPa kn/ks 1 k¯n/k¯s 1 µ 0 ¯c 200± 50 MPa ¯cc 1 ¯ 1 Rmin 0.55 mm Rmin...

... Upstream Oil & Gas äspö diorite strength skb report Reservoir Characterization stress magnitude shear zone experiment pillar stability experiment borehole heater experiment drift Stability Experiment reservoir geomechanics displacement brittle failure MPa äspö pillar...

... fracture-like breakout drilling fluids and materials bit selection borehole breakout sandstone penetration rate breakout drilling variable Wellbore Design mechanism MPa drilling-fluid flow rate Haimson 1. INTRODUCTION Stress-induced breakouts in vertical holes are the product of compressive...

... Reservoir Characterization Upstream Oil & Gas experiment thermoporoelastic model Wellbore Design prediction MPa fracture gradient Temperature Effect Magnitude wellbore integrity initiation Leak drilling fluid temperature mud temperature wellbore temperature proceedings...

... Upstream Oil & Gas porosity Reservoir Characterization Fluid Dynamics fluid pressure MPa specific storage effective stress law rock sample flow in porous media effective pressure sandstone Tennessee Sandstone Artificial Intelligence pore pressure deformation permeability...

... loading rate of 1 MPa/min; anisotropic compression tests with different effective stress ratio keff = 0.5 or 0.7; where: v h effk = (8) for all such type of tests, an effective axial stress loading rate equal to 1 MPa/min was used; depletion tests: the sample is first loaded, with a fixed...

...) and gran- ite (Schmitt & Zoback 1989). oLJ_J-~ marble I-Ct==Io limestone Imn !min~max , ~25% +25% . l1J-- quartzite ~ gra.nlte.~iorite gabbro,diabase .. basall. amphibpllte o 10 20 30 40 50 60 Tensile Strength. MPa Figure 3. Distribution of tensile strength in rock, after Lock ner (1995). 2.2 impulsive...

...) Friction angle of sample (degree) Cohesion of sample (MPa) Dilation angle of sample (degree) Tensile strength of sample '(MPa) Porosity of sample Penneability of sample «m/secPalm» Bulk modulus of fluid (GPa) Density of fluid (kg/m3) Nonna! stiffness of interface (Palm) Shear stiffness of interface (Palm...

... 1.4 1.2 S g £ li O.B m § 0.6 Q) 0.. 0.4 0.2 Loading dirj.ctiOn 0 0 20 40 60 80 10( Axial load (MPa) Figure 2: Permeability and axial load for sample 1 5 4.5 4 3.5 ~ 3 15 2.5 <tl <tl E 2 Cii 0.. 1.5 Loading direction .. 0.5 1 ~ I I I o o 20 40 60 80 100 120 140 160 Axial load (MPa) Figure 3...

... boreholes reveal that the average coal stress increases with the average rock stress. Upstream Oil &amp; Gas seam Thickness Coal Basin MPa database stress difference tectonic stress Reservoir Characterization coal horizontal stress sequence seam thickness stiffness Rock stress minimum...

... agreement. bloch poroviscoelastic solution anelastic strain recovery Upstream Oil &amp; Gas anelastic strain horizontal stress reservoir geomechanics determination in-situ stress magnitude MPa strain recovery asr test GPa input data stress field Reservoir Characterization stress...

.... The test was performed on a synthetic weak and compactive sandstone (Tronvoll et al. 1997). Ini- tially the external radial stress was increased to 3 MPa. Then paraffin oil with a 5 cp viscosity was flown radially through the specimen. The fluid flow rate was increased stepwise between 0.25 IImin and 3...

... characteristics of a material. The results agree well with available experimental data. Reservoir Characterization criterion specimen distortion energy tri-axial test Rock mechanics MPa failure process Upstream Oil &amp; Gas polycrystalline material Gaziev national autonomous university...

... significantly improve safety. The successful implementation of hydraulic fracturing at Moonee Colliery to control the timing of goaf events has enabled the mine to continue operating. hydraulic fracturing compliance reservoir geomechanics conglomerate roof free surface CONVERGENCE data MPa leakoff...

... it was applied to a practical numerical analysis, finite element analysis commonly used. Upstream Oil &amp; Gas crack length mechanical crack model critical crack length nonlinear stress-strain curve shear crack application MPa finite element analysis Reservoir Characterization Simulation...

.... However, the strain can be measured at arbitrary locations around the bore- hole by rotating the tool in the borehole and repeat- ~ 0.16Fi1 'I 9 =0 [deg] 0.14 0.12 0.1 - 15 . - - 30 -6 45 . ·17 . 60 - 75 . - 90 10 15 20 25 P,MPa 30 35 Figure 7. Variation of .11: with P observed for the case that SH 12...

.... structural geology strength anisotropic rock Reservoir Characterization general triaxial compression maximum principal stress MPa Upstream Oil &amp; Gas maximum differential stress plane foliation plane intermediate stress reservoir geomechanics orientation differential stress stress drop...

... random orientation associated with localized brittle failure. A decrease in the strain rate from 7.5 x 10"sec:' by an order of magnitude changes the brittle-transitional boundary from about 80 MPa to about 50 MPa. The lower strain rate also shifts the effective confining pressure range for BDT towards...

... based on Brazilian tests, Hart (1994), assumed (not yet measured) (Darcy) (J to 2) x 10.2 1102 v 0.33 0.26 1186 a (MPa) (MPa) 4.0±O.5 49±2 0.7" 1.6±0.4 24±2 0.7'" Pore Fluid Confining Pressure Port Figure I . Triaxial cell for hydraulic fracturing lesls in porous sands lOne subjected to pore pressure...

... hydraulic fracturing borehole borehole wall crack extension procedure AE count rate burst correspond stress measurement stress condition AE sensor MPa crack tip reopen pressure sonde Upstream Oil &amp; Gas pressure-time record extension shut-in pressure Magnitude Pacific...