... 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...

... 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...

... a pressurized borehole. Different in situ stresses and borehole sizes are considered. In addition, the effect of material ductility and size effect are studied and discussed. The results show that borehole size has an important effect on the crack extension regime. It appears that due to the existence...

... 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...

... ABSTRACT: Previous studies show that the effective fracture toughness will increase with the rise of rock ductility during the hydraulic fracture propagation. Higher pump horsepower is required for fracture propagation and stimulation volume will decrease extensively. However, such conclusion...

... 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...

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