... attained from larger samples using more conventional methods. We would like to emphasise, however, that a larger number of systematic experiments is needed to strictly confirm this conclusion. Such work is planned. Relevant questions relate to both the experimental methodology and its interpretation...

... of the rock constitutive law. Introduction In laboratory experiments, an evolution of the measured rock properties is observed when the core undergoes cyclic solicitations. Generally the experimental procedure consists in cycling the sample between some nominal stress and a maximum stress, several times...

... Abstract We conducted laboratory-drilling experiments in Berea sandstone blocks of two different porosities in which borehole breakouts were induced under several truly triaxial far-field stress conditions. We used a petrographic microscope to study thin sections of the drilled boreholes...

... basement dome stress model experiment structural geology geometrical parameter velocity component stringer salt dome assessment configuration upstream oil & gas .. if. SP131SRM 47241 In-Situ Stress Assessment of lntra-Salt Stringers P.A.J. van den Bogertl, E.H. Hoogerduijn Strating2, M.C...

... Abstract Hydrostatic and triaxial compression experiments have been conducted to investigate the evolution of fluid permeability and fluid storage capacity in Tennessee sandstone, a low- porosity tight' reservoir sandstone. A newly developed single-ended transient pulse permeability...

.... Experimental observations of rock cutting indicate that a "plastic" mechanism of failure takes place at small depth of cut d. This mode of cutting is also referred to as "scratching". The results of scratch experiments on various sedimentary rocks have indicated the possibility of estimating the rock strength...

... it. Experimental procedure The experiments were performed on 50-mm cubes of Darley Dale sandstone (oven-dry) cut parallel to the bedding plane. The opposite faces of the cubes were within 0.01 mm paralIel to each other. Darley Dale is a well indurated, felspathic sandstone with a siliceous cementing material...

... to characteristically decrease. This is a result of mechanical damage (i.e., plastic yielding) of the rock at high stresses. These effects will be demonstrated in the experimental section. Experiments Measurements of both dipole and compressional wave propagation along borehole have been made in the laboratory. Several...

... vertical (= axial) stress (Table 2). We applied a best-estimate stress path characterised by a SPE 47277 DEPLETION-INDUCED COMPACTION OF AN OVERPRESSURED RESERVOIR SANDSTONE: AN EXPERIMENTAL APPROACH 3 g-coefficient of 0.7 in four experiments (Table 1). In one experiment a g-coefficient of about 1...

... values are obtained from a combination of field and laboratory measurements. P. 555 intensifier stiff testing machine acoustic property oil saturation gassmann transducer pore pressure experiment drainage velocity change saturation effective pressure upstream oil & gas accuracy...

... Abstract We report an experimental study on the poromechanical behaviour of a sandstone rich in clay minerals. With the use of Biot's theory of poro-elasticity, results obtained from mechanical experiments performed in a triaxial cell at temperatures up to 200 C are compared with results...

... strengths and stiffness. The micro-indentation measurements showed that both IM and CTF were significantly affected when the experiments were performed on small samples with volumes ranging from 0.04 Cm3 to 0.7 cm3. Correlations combining the Uniaxial Compressive Strength (UCS), Young's Modulus (E...

... the electric pmntial change during the entirety of the deformation experiments for dry and satumted Darley Dale sandstone and Icelandic basalt. Experimental conditions are given with each curve. all experiments were performed at a strain rate of 1.5 x 10-5 s-l. 252 47359 Eleetriial PotentialChange due to Fluid...

... of the set of differential equations, obtained from the theoretical model, a finite-element (FE) approach is used to simulate experimental results. The quadriphasic model is used to simulate a high pressure high temperature (HPHT) oedometer experiment, designed for studying the interaction of drilling fluid...

... behaviour of the tlacture, and subsequently pressure deciine and closure times. Possible deviations we want to address are radius changes after shut-in, surface roughness of the fracture, and plastic rock deformation. Experimental set-up and method Scaliug. We performed scaled model experiments of hydraulic...

... strain direction) intervenes in the constitutive relations. So, during such an experiment, the measured Biot tensor component is the one relative to the direction of the uniaxial strain experiment. The experimental determination of the Biot tensor components is performed by measuring Biot tensor...

... dependent deformation experiment upstream oil & gas reservoir geomechanics ILL SPE/lSRM 47401 me SOSaty of Patroleum Englna& Viscous Rheology and State of Stress in Unconsolidated Sands C.T. Chang and M.D. Zoback, SPE, Stanford University 1t9SB, S0f2iLo3fPfyetrdaum Enginaars, IIW. Tfds -r...

...) are not well defined due to a lack of data from laboratory experiments. 323 . SPE 47372 LABORATORY STUDIES ON THE DEPENDENCY OF TEMPERATURE AND FLUID PRESSURE ON FAULT ZONE STRENGTH, SLIP AND SEALING POTENTIAL 2 Experimental Procedure To investigate the effects of ambient crustal conditions on rock strength...

... in standard triaxial tests at different confining pressures in order to determine the resulting yield envelope. Such experiments were performed both under compressional and extensional conditions. Under compressional conditions the preceding loading resulted in a corresponding stretching of the elastic...

... to 0.0025 is shown in Fig. 5. Very good agreement is obtained between the simulation and the experiments. Annulus Expsrlment Experimental Set up. To validate our approach, we developed an instrumented annular experiment. The experimental set up consists of two concentric steel cylinders of different...