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Keywords: assembly
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Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1968
... to failure if the high pore pressure depletion from production imparts excessive compaction strain on the completion assembly. We hypothesize that compaction-induced sand production failure is the result of a buckling mechanism where a large amount of stress and strain is exerted along the most slender...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1208
... ABSTRACT: Bonded-particle models (BPMs) provide a synthetic material consisting of a packed assembly of rigid grains joined by deformable and breakable cement at grain-grain contacts, and whose mechanical behavior is simulated by the distinct-element method. Contact- and parallel-bonded PFC2D...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-790
... the experimental PSD, without any idealization have been also discussed [5]. psd permeability fluid dynamics intrinsic permeability assembly evolution apparent permeability prediction klinkenberg coefficient random assembly information porous material porous network flow in porous media...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-657
... mechanical property wellbore design wellbore cement cement chemistry cement casing and cementing cement sheath cement property composite sample reduction hardness pipe expansion fixture assembly wellbore integrity compaction compression cement slurry expansion cone post expansion...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-647
... various loading conditions. Initially, aggregates of five different shapes and four different sizes, assembled at a certain volume ratio, were subjected to compression tests under constant confining pressure. The results indicated that: (i) cracks initiate more easily in larger particles...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-110
... and cooling of a downscaled casing-cement-rock assembly. Tensile failure was predicted during thermal cycling of the casing-cement-rock assembly at both heating and cooling stages. The failure occurred predominantly in damaged cement and damaged rock. The simulation results suggested that cement immediately...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7108
... Abstract The paper presents preliminary results of the ongoing experimental study of stick-slip, a mode of torsional vibrations of drilling assembly using drag bits. These experimental results are in agreement with a recent theoretical paper on stickslip that concludes that the main driving...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7626
... Abstract This paper presents a multi-scale lattice Boltzmann/finite element scheme that quantitatively links particulate mechanics to hydraulic properties of a grain assembly obtained from a simple shear discrete element simulation. A spatial homogenization is performed to recover...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7751
... investigation restriction plate penetration rate venturi cavitation cuttings transport drilling fluids and materials frequency Simulation Usgpm prototype axial compliance vibration assembly drilling system 1. INTRODUCTION Drilling efficiency is governed by rock cuttings removal by hydraulic...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-495
... Abstract: This paper deals with self-excited axial vibrations of a drilling assembly. In particular, an analytical model of self-exited axial vibration that accounts for regenerative effect is presented. The paper also introduces a state-of-the-art laboratory drilling equipment dubbed ASPEN...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-348
... Methods (DEM) are better suited to capture the loss of compression and shear strength with particle crushing. In DEM, a Representative Elementary Volume typically contains several thousands of particles, which involves high computational costs. In all of these approaches, the assembly of grains...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-647
... of the fracture network. Further insights into the mechanisms of the induced fracturing is provided by the use of Synthetic Rock Mass (SRM) numerical models that reproduce the nature of the rock and the stress conditions imposed by the engineering. The rock mass is reproduced by an assembly of bonded particles...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-621
... ABSTRACT: The process of fluid injection into dense granular media is analyzed using the DEM code PFC2D ® coupled with a pore network scheme. A simple approach to calibrate the microscale parameters to match the permeability of a particle assembly, predicted from the Kozeny-Carman...
Proceedings Papers

Paper presented at the 45th U.S. Rock Mechanics / Geomechanics Symposium, June 26–29, 2011
Paper Number: ARMA-11-305
... porous rock materials and to result in representative peak-loading behavior for the aggregate sample. Uniaxial compression and Brazilian tests were numerically performed on granular assemblies with rock-like properties. INTRODUCTION Experimental testing of rocks under various loading conditions...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-400
...”, in order to reproduce the results obtained in the field. 2. BACKGROUND Potyondy and Cundall (2004) showed that the mechanical behavior of a rock can be conceptually represented as a cemented granular assembly; where both the grain and the cement can deform and may eventually fail. They proposed...
Proceedings Papers

Paper presented at the 43rd U.S. Rock Mechanics Symposium & 4th U.S. - Canada Rock Mechanics Symposium, June 28–July 1, 2009
Paper Number: ARMA-09-024
... macro-mechanical behavior. An ideal experiment would validate DEM simulations against identical physical models with similar micro-mechanical properties. The second part of the paper discusses the results of such investigations undertaken on numerical and physical cemented (cohesive) assemblies...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-337
... government nozzle design waterjet scaling metals & mining loose rock Effectiveness waterjet smoothwall operation operator orifice jet shotcrete rock surface Colorado assembly nozzle 1 1. INTRODUCTION A large number of accidents in underground mining are caused by rock falls...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-047
... in geomechanics from soil (particulate type) to intact rock (relatively continnum type), to rock masses (assemblies of blocks) with applications in many areas, such as rock engineering, soil mechanics, mining and petroleum engineering [2-7]. When modeling the behavior of intact rock, the elements used...
Proceedings Papers

Paper presented at the Golden Rocks 2006, The 41st U.S. Symposium on Rock Mechanics (USRMS), June 17–21, 2006
Paper Number: ARMA-06-1125
... to be rigid, and the behavior of the assembly is characterized by the linear stiffness model, the contact-bond model and the slip model. The linear stiffness model provides a linear relation between contact force and relative displacement. The contact-bond model controls strength features of a synthetic...
Proceedings Papers

Paper presented at the DC Rocks 2001, The 38th U.S. Symposium on Rock Mechanics (USRMS), July 7–10, 2001
Paper Number: ARMA-01-0173
... in very soft and weak geomaterials). The primary influence on parting behavior is shear bonding at the granular scale. We also investigate slurry injection processes in granular media by coupling fluid flow simulators with particle models for several near wellbore assemblies. Although there are clear...

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