... ABSTRACT High voltage electrical pulse (HVEP) is an innovative technique with the low-energy and high efficiency. In this study, we establish a two-dimensional numerical model of multi-physical field coupling the electrical breakdown of porous rock with randomly distributed pores...

... ABSTRACT: Creep is an inelastic mechanism with severe implications on the long-term mechanics of fluid-bearing reservoirs and underground geophysical systems. In the context of porous rocks, recent experimental studies have shown that such class of geomaterials may exhibit delayed...

... Characterization pore network porous rock initial confinement tortuosity Upstream Oil & Gas Fluid Dynamics particle confinement sandstone MPa flow in porous media deformable porous rock breakage specimen reduction hydro-mechanical response porosity permeability evolution porosity reduction...

... Reservoir Characterization carbonate reservoir porous rock specimen castellanza Upstream Oil & Gas boundary compression strain localization carbonate rock localization localized deformation constitutive model stress path compaction band deformation localization analysis 1. Loc mo con...

... with increasing back pressure. flow in porous media reservoir geomechanics full saturation back pressure specimen increment compressibility porous rock coefficient saturation Reservoir Characterization Fluid Dynamics calculation Pore Fluid application Upstream Oil & Gas pore pressure...

.... The paper provides a modeling strategy to address technical problems involving porous rocks and identifies a set of material properties that can have a major effect on the geomechanical characterization of porous sedimentary formations. 1. INTRODUCTION Limestone and sandstone have been used...

... shear Reservoir Characterization pore pressure AE event water front sandstone AE hypocenter borehole ae cloud hypocenter reservoir geomechanics acoustic emission water injection bedding plane perpendicular porous rock Geophy injection propagation 1. INTRODUCTION It is well-known...

... media bond breakage reservoir geomechanics shear band Reservoir Characterization confinement experiment mechanism Upstream Oil & Gas Laboratory Observation localization discrete particle modeling sandstone specimen lateral stress band formation Fluid Dynamics Simulation porous rock...

... INTRODUCTION ABSTRACT: Strain localization in porous rock occurs within a mode spectrum delineated by conjugate shear and compaction bands, depending on the imposed stress state. Both modes involve microdeformation including grain boundary failure, grain breakage, and pore collapse...

...COMPRESSIBILITY OF POROUS ROCKS UNDER DIFFERENT STRESS CONDITIONS Ziqiong Zheng TerraTek, Inc., Salt Lake City, Utah 84108 INTRODUCTION Applications of reliable compressibilities include reservoir pressure maintenance and subsidence evaluations and production forecasting. Due to their importance...

... medium. However, deformation measurements on both high porosity sandstones and low porosity granites have been explained [2] adequately in terms of an equivalent two-constituent model of porous rocks, for which exact results relating constituent moduli to macroscopic effective moduli have been discovered...

... Reservoir Characterization synthetic sandstone Pore Fluid Geophy saturation Pore Pressure Buildup Coefficient sandstone MPa sandstone sample equation propagation reservoir geomechanics undersaturated sample natural sandstone Upstream Oil & Gas Kayenta sandstone porous rock...

... and an increase in effective stress. Under such conditions, certain porous rocks experience a sudden increase in compressibility. This increase, coupled with the accompanied irreversible deformation, is often termed as "pore collapse" [Sinits et al., 1988; Addis, 1987]. This phenomenon often leads to an abrupt...

... Dynamics Upstream Oil & Gas specimen porous rock indentation indenter cavity Sulfur compacted region Indiana limestone propagation Rock Mechanics as a Multtdtsctplinary Sctence, Roeg ers (ed ) ¸ 1991 Balkema, Rotterdam. ISBN906191 194X The role of wetting fluids during the indentation...

... reducing the efficiency of the overall process during drilling. This problem is thought to be specifically acute in the case of deep drilling of porous rocks for gas and oil using roller cone bits. INTRODUCTION The generation of a compaction region during indentation is not a new phenomenon...

... and the peak amplitudes of the events. The dense samples showed fewer events, especially between the time of initial loading and the failure of the sample. The porous rock maintained a higher rate of events throughout the test. Peak amplitudes of the events were also higher for the densely welded sample than...

... ABSTRACT ABSTRACT Scanning electron microscope studies were performed on porous rocks indented by a sharp wedge. A large range of discontinuous processes was observed, such as tensile cracks and shear bands. The localization of the deformation appears both at a macroscopic level...

... ABSTRACT ABSTRACT The variation with pressure and temperature of the thermal-expansion coefficient of cracked and porous rocks can be explained by using an asperity-deformation model. This model explains the low and, some- times, negative expansion coefficients measured under confining...

... ABSTRACT Abstract Laboratory data on the time-dependent compaction of porous rocks are presented, and various attempts to model this behavior are described. These lead to a discussion of the problems that arise in using laboratory data to estimate long-term effects. A method is suggested...

... INTRODUCTION ABSTRACT An experimental investigation was conducted to study the response of soft, porous rock, green shale, under dry and liquid-filled conditions to normal impact of hemispherically-tipped cylindrical steel projectiles with diameter and mass of 6.35 mm and 31 g, respectively...