... ABSTRACT The brittle to ductile transition phenomenon in deep shale gas formations is a challenge for hydraulic fracturing and is of interest from both a geological and an engineering perspective. A series of uniaxial and triaxial compressive experiments at increasing confining pressures...

... in the uniaxial compressive strength (UCS) value of granite. However, the UCS value of granite undergoes a significant decline with increasing mica content. Additionally, the presence of quartz intensifies the brittleness of granite, while feldspar enhances the ductility of granite. In the isotropic model...

...). In this study, cavity expansion of a borehole is modeled using a bonded particle system. The effects of in situ stress, borehole size, and material ductility are investigated and discussed. ARMA 19 28 Bonded Particle Simulation of Cavity Expansion Test in Rock Fatemeh Molaei Department of Mineral Engineering...

... of the deformation and fracturing response of the reservoir using material constitutive laws for brittle and ductile regions. We outline a coupled flow-geomechanical simulation framework that fits into available reservoir simulation platforms and does not require pre-specified fracture paths. We develop the fracture...

... Engineering initiation mechanical property hydraulic fracture propagation hydraulic fracturing fracture toughness ductility fracture propagation fracture initiation time breakdown Upstream Oil & Gas international journal Rock mechanics rock mechanical test fracture initiation...

... of the Pennsylvania blue sandstone. It is shown that for a more ductile material, there is less scatter of micro-cracking at the peak load. Furthermore, the ductility parameter appears to be a good tool in controlling the ratio of compressive to uniaxial tensile strength of rock. While the ductility of the filling...

... and material ductility on the length and width of the FPZ at the peak load. The material ductility was controlled by using different slopes for the post-peak behavior of contacts between the circular particles in tension. A statistical approach is proposed to more objectively calculate the width and length...

... fracturing in weak formations of varying ductility. The model is based on Mohr-Coulomb dislocations that are placed in the effective centres of the complete slip process that is distributed around the crack tip. The new brittleness index varies between 0 and 1 with the one limit to correspond to brittle...

...EFFECTS OF WATER-SATURATION ON STRENGTH AND DUCTILITY OF THREE IGNEOUS ROCKS AT EFFECTIVE PRESSURES TO 50 MPA AND TEMPERATURES TO PARTIAL MELTING S. J. Bauer, M. Friedman, and J. Handin Center for Tectonophysics Texas A&M University College Station, TX 77843 INTRODUCTION Energy extraction from...

...,STRENGTH AND DUCTILITY OF FOUR DRY IGNEOUS ROCKS AT ILOW PRESSURES AND TEMPERATURES TO PARTIAL MELTING Iby M. Friedman, J. Handin, N.G. Higgs, and J.R. Lantz, ITexas A & M Univ. This paper was presented at the 20th U.S. Symposium on Rock Mechanics, held in Austin, Texas, June 4-6, 1979...

... stress versus axial strain curve and Poisson's ratio versus axial strain curve are shown in Fig. 10. From the stress versus strain curve, it was found that the oil shale core sample has moderate ductility. Discussion of Test Procedures The result of this study shows that the success in conducting the MST...

... of fiat jacks that may be made. Pressure and stroke of the fiat jack are, of course, limited by the thickness, P ASE I FLATJ. CK TESTS 405 strength, and ductility of available materials and by fabrication techniques. Fabrication details for the jacks used in this experiment are shown in Figure 1...

... reservoir geomechanics Turner structural geology translation Colorado School Reservoir Characterization yule marble America Bull Upstream Oil & Gas strength ductility ultimate strength structural petrology specimen grigg deformation SOC application Handin experimental...