... was observed in the field [1,2,3], and their occurrence verified in laboratory experiments conducted on crystalline and carbonate rocks [4,5,6]. Breakout orientation in vertical-boreholes is typically along the diameter aligned with the direction of the minimum horizontal in situ stress, called the h...

... 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...

... as the ratio of the increment of liquid volume content (fluid volumetric strain) to the total composite volumetric strain (drained experiment). Then, it is easy to show that: )( 1212 1 2 111 2 001 O )r,rU(P )r,rU(P , (9) where denotes porosity. The above function, along with the experimentally determined...

... Reservoir Characterization wellbore integrity reservoir geomechanics wellbore pressure management Upstream Oil & Gas annular pressure drilling experiment drill-bit far-field stress condition fracture-like borehole breakout Mansfield sandstone borehole wall breakout length...

... toughness of the solid is sufficiently large (see Eq. 12). 2. EXPERIMENTAL PROGRAM The PMMA (Polymethylmethacrylate) specimens (E=3300 MPa, = 0.4, KIc=1.4 MPa m1/2) were constructed by laminating two or three preliminary experiments indicated that results are independent of the thickness...

... experiments (6 experiments in total, using different confining pressures). The experiments were performed on core plugs taken from a block of Salt Wash South sandstone. Figure 2 illustrates the experimental data and the model calibration where the peak strength, pre- failure stiffness (gradient of stress...

..., such as creep, for estimating porosity and permeability changes. Empirical relationships between production-induced compaction and permeability loss were derived based on several laboratory experiments. The two limiting trends derived in this study describe almost 95% of the experimental results. While...

... 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...

... with the predictions, the correct simulation of breakout propagation requires further attention. 4. CONCLUSIONS The stability of hollow cylinders with holes of various geometries have been studied experimentally and analyzed numerically. Experiments on specimens with cylindrical holes and holes with pre-cut elliptical...

... are predicted (2-5 % of the maximum pressure drop). This coincides with our actual experiments, where rock failure was observed only with initial stresses already close to the failure envelope. In other words, the experimental observations could be well explained using the realistic boundary condition. 0.5 a) b...

... Reservoir Characterization compressibility pore pressure compaction consequence stress path overburden reservoir geomechanics Reservoir Compaction pore compressibility sandstone elastic limit permeability depletion Upstream Oil & Gas experiment stress path coefficient...

... Reservoir Characterization experimental observation shale SINTEF Petroleum Research stiffness s-wave velocity frequency free water Velocity Dispersion rock physics model physics model Upstream Oil & Gas transition porosity shear moduli clay mineral experiment dispersion...

... is controlled largely by the intergranular bond strength and stiffness. In this study we aim at providing guidance for choosing these numerical parameters by performing experiments on a controlled granular material. 2. EXPERIMENTAL SETUP The numerical model is based on spherical particles which can be cemented...

... bit selection drilling operation bit design oscillation torque coupling RPM regime rotation bit-rock interaction law cleaning Upstream Oil & Gas correspond coefficient stick-slip vibration interaction stick-slip oscillation experiment torsional vibration vibration...

... field sampling and testing techniques were developed and a series of in situ and laboratory experiments were per- formed. These included modifications of rock coring procedure, field pressuremeter, PS logging, Lugeon tests and laboratory triaxial tests. A test site was developed where rock cores were...

... been used to study the interface behavior of geological material (Khair, 1983), and bit-rock interaction in quasi-static state of stress (Khair et al. 1997). 41 2.EXPERlMENT AL PROGRAM The objective of these experiments was to evaluate tool rock interaction in quasi-static indentation process...

... Technology, Auckland Park.]ohannesburg, South Africa & Department of Earth Sciences, Liverpool University. UK A.J. Rorke - Bulk Mining Explosives (Pty) Limited, Bryanston, South Africa G.J. Finnie - Anglogold Deelkraal Mine, Carletonvil/e, South Africa ABSTRACT: A simulated roekburst experiment was conducted...

... hypotheses can be postulated and experimental tests can be performed and field observations can be made to support any of these as a valid mechanism for sand production. It is our contention that the mode of failure can- not be, uniquely defined as it depends on a number of variables including: geological...

...., USA ABSTRACT: We present meso-scalc modeling of impact recovery experiments on sandstone using a hybrid Smooth Particlc Hydrodynamic (SPH) and Discrete Element Method (DEM) approach. Each grain is rep- resented with clusters of particles providing explicit rcpresentation of the grain/pore structure...

...Pacific Rocks 2000, Girard, Liebman, Breeds & Doe (eds) © 2000 Balkema, Rotterdam, ISBN 90 5809 1554 A volumetric sand production experiment E. Papamichos SINTEF Petroleum Research, Trondheim, Norway A. S k jrerstein Norsk Hydro, Stabekk, Norway ITronvoll ORMIS, Trondheim, Norway ABSTRACT...