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Keywords: friction
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1572
... Longmaxi shale gouges at high pressure and high temperature (HPHT) that probe the underlying mechanisms controlling injection-induced earthquakes. The frictional strength and stability properties of shale gouges were obtained via velocity-stepping experiments at a confining pressure of 60 MPa , pore...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1959
... ABSTRACT: One of the parameters that govern the interaction between hydraulic fractures (HF) and natural fractures (NF) is the coefficient of friction between the two NF-surfaces (Gu and Weng, 2010). Therefore, the characterization of natural fractures is important when analyzing this type...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1955
... dependence of fault slip: for the same amount of injected volume, lower injection rate builds up lower pore pressure, and triggers less slip and less seismic events. 1. Introduction Fault gouge is crushed and ground-up rock produced by friction between the two sides when a fault moves (Scholz, 2019...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0263
... significant friction which leads to very high surface pressure, pushing the limit of surface pumping equipment. In addition, the ultra-high temperature disqualifies any conventional fluid system due to failure of maintaining desirable properties under high temperature. As counter measures the authors explored...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0372
... into the design to restrict the forces and displacements to purely linear shear and normal directions, decrease the amount of friction in the system, and more closely measure the actual forces exerted on the sample. This paper describes the key features and innovations associated with the development...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0487
... ABSTRACT: The At high-stress conditions in hard rock masses, the behavior of intact rock plays a major role in crack initiation and propagation, defining damage conditions around excavations. For modeling brittle rock behavior, the Cohesion-Weakening-Friction-Strengthening (CWFS) linear model...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1617
..., which accounts for the full fluid-solid coupling nature of hydraulic fracture propagation, stress interactions between multiple growing fractures, and the coupling with the wellbore flow via entry friction. We restrict the hydraulic fractures to be fully contained in the reservoir. After presenting...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1700
... demonstrate three visible slip stages from static friction to unstable slip. Variable normal stress and its response to a sudden change in shear stress was observed from the acquired pulse data. Moreover, slowly stick-slip friction dominates the injection-induced shearing in the velocity of tens...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2087
... ABSTRACT: Accurating estimation of fracturing friction is critical to reservoir stimulation, and drag reduction performance is also the most important technical indicator of slickwater. Fracturing friction consists of three parts: wellbore friction, perforating hole friction and fracture...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2183
... engineering approach to mimic processes or parameters distributions are used. geothermal reservoir pore pressure candela injection-induced seismicity Reservoir Characterization fault roughness heterogeneity rupture event Upstream Oil & Gas friction normal stress Geophy seismicity...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2118
... to the removal of asperities and redistribution of wear products, which locally reduces porosity in the dilating fracture. This study provides insights into the understanding of the mechanisms of frictional and rheological evolution of rough fractures anticipated during reactivation events. fracture...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-174
... ABSTRACT: Dynamic friction slip of rock joint is prevalent in seismic wave propagation and plate sliding. Great concerns have been taken to reveal the whole process of dynamic friction slip, i.e. the wave-induced micro slip, the inertial slip, and the plate sliding. Series of measuring...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1360
... permeability and friction throughout phases of the seismic cycle. This is accomplished a slide-hold-slide and pore pressure stepping experiments completed in double direct shear. Fracture reactivation results in permeability enhancement only after sufficiently long interseismic repose periods. The magnitude...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-478
... ABSTRACT: In this study, we explore the evolution of friction and permeability of a propped fracture using shearing-concurrent measurements of permeability during constant velocity shearing experiments. We separately examine the effects of normal stress (1 MPa, 3 MPa and 5 MPa), proppant...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1167
... ABSTRACT: We present a novel rotary shear experiment that was conducted under X-ray micro-computed tomography (µ??) scans. This combination of methodologies allows for the measurement of friction during shearing and provides the opportunity to directly observe the rock joint evolution. Our...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1177
... ABSTRACT: Understanding the frictional behavior of fault gouge materials has important implications for interpretation of mechanisms involved in fault movements that result in earthquakes. Fault behavior and stability are significantly influenced by properties of the gouge material...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0437
... ABSTRACT: In this study, we use the Discrete Element Method (DEM) to numerically simulate the micromechanics of frictional behavior of faults. Although fault zone widths can be tens of meters, the principal slip occurs within localized zones having widths of a few millimeters. Fault slip...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0696
... ABSTRACT: It is important to consider the influence of temperature when evaluating the frictional behavior of a single rock joint since it may change due to the geochemical processes occurring at the asperity contacts such as mineral dissolution. It is thought that the chemical processes may...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0490
... Artificial Intelligence displacement stress state seismicity reservoir geomechanics friction Earthquake fluid flow hydraulic fracturing hydraulic aperture shear strength Simulation Schultz fault movement reservoir stimulation Reservoir Characterization Upstream Oil & Gas fluid injection...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0470
... ABSTRACT: During the confined comminution of granular materials, the work input is transformed into elastic energy stored in the grains, breakage energy used to generate new surfaces, energy dissipated by friction between grains in contact, and redistribution energy dissipated by the relative...

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