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Keywords: transition
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1415
... hydraulic fracture branching. reservoir characterization equation of state transition hydraulic fracturing constant rate reservoir geomechanics complex reservoir weak layer injection rate diffusion-dominated injection viscosity injection parameter fracture heterogeneity shale gas...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1065
... for the transition from smooth creeping movement to the rapid "slide-quake" rock avalanche. The model shows that despite gravitational self-stabilization of rotational landslide, the rapid slide instability is possible, and provides condition for initiation of rapid slide. A precursor of rapid slide is formulated...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1230
... the development of pore pressure and effective stress in cement, after phase transition. A sensitivity analysis indicates that formation permeabilities above 1 micro-Darcy lead to drained curing conditions. Bulk volumetric shrinkage in cement, after the transition to a solid state, can relax cement stresses...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2023
... are obtained from the discretized governing equations. These results show that the borehole pressure continues to increase after fracture initiation to eventually drop off. According to this model, the peak pressure does not correspond to a breakdown of the formation, but rather to a transition between two...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1720
... a NX triaxial Hoek cell. Confining pressure (s 3 ) ranged from 5 MPa to 70 MPa. The brittle-ductile transition pressure was found to be between 20 and 35 MPa for marble and between 55 and 70 MPa for limestone. The lower boundary of this range was approximately equal to one third of the unconfined...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1319
... transition viscosity serebrinsky fracture propagation complex reservoir Simulation interaction map Reservoir Characterization Upstream Oil & Gas journal of petroleum technology equation hydraulic fracture fracture propagation fluid viscosity Blanton natural fracture reactivation crack...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-897
... is investigated for a suite of rocks and the impact of confining pressure on their failure mechanism and brittle-ductile transition is studied. The samples are wrapped with copper jacket such that the confining fluid does not communicate with the rock matrix. Then, by applying a constant confining pressure...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0642
... ABSTRACT: Transitions between separation and contact modes are prevalent in rock mechanics. For stimulating tight hydrocarbon reservoirs, the transfer of hydraulic load from hydraulically loaded to in-situ cracks, removal of hydraulic load, re-fracturing, and application of cyclic loading...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0979
... ABSTRACT: Because of the presence of fracture process zone, fractures in quasi-brittle materials are structural size dependent. This is also the underlying reason for the ductile to brittle failure mode transition when the structure size increases. An exponential displacement-softening model...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0371
... network at depths approaching the brittle-ductile transition. We will discuss the spatial distribution of the developed fracture network for various P-T regimes. The results of this study are intended to support future experimental and/or field-based investigations and pave the way for a field...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-150
... technically and economically feasible especially in North America in the last decade. Upstream Oil & Gas transition propellant evolution hydraulic fracturing time 0 stimulation Well Stimulation wellbore fracture Engineering nucleation discontinuity finite element method element method...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-786
..., with a transition from turbulent to laminar at some point along the fracture length, depending on the value of inlet Reynolds number. Results showing the effect of smooth and rough turbulence on the fracture length and fracture width depending on the Reynolds number are finaly presented. Introduction The usual...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-270
... of granular material manifests as a transition from brittleness to ductility. However, there is still no micromechanical model that can capture this transition. Breakage mechanics is a continuum mechanics theory that allows to analyzing the behavior of granular materials based on statistical and thermodynamic...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7467
... discontinuity was applied to simulate the transition of the fault system in central Taiwan from 1935 to 1999. And the results properly show the transition of regional stress field and the propagation of the faulting during the 1999 Chi-Chi earthquake. In order to assess and mitigate the risk of active fault...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7682
... damage at sub-critical stress levels are also important characteristics of the failure process. Here, load-reload triaxial compression tests are used to investigate damage development at low and high effective pressures, and test models of yield across the brittle-ductile transition. Water saturated...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7014
... in ductile shales. However, when subjected to a high rate/pulse loading, rock might exhibit a brittle to ductile transition and a complex fracture network might be created. Along these lines, the concept of pulsed fracturing, that customizes the pressure-time behavior of a pulse source to create multiple...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7489
... geotechnical baseline report Reservoir Characterization strength brittle failure reservoir geomechanics tunnel alignment structural failure blocky rockmass behavior rockmass behavioral uncertainty in-situ stress Artificial Intelligence transition failure mode rock strength tunnel domain ground...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-325
... in which brittle-plastic transition was observed. The results indicated that the fracture initiation stress was more sensitive to the influence of grain size due to the length of initial cracks, and was inversely related to both porosity and mean grain size. Stress-strain data were incorporated...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-582
... or supercritical phase states. reservoir geomechanics transition dolostone Upstream Oil & Gas strain gauge dynamic moduli dynamic bulk moduli moduli fused quartz subsurface storage Reservoir Characterization co 2 pore pressure strain value dry sample bulk modulus pore space MPa...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-427
... properties that are sensitive to mechanical and thermal loads. With increasing pressure and temperature, rocks undergo a transition in failure mode from localized brittle failure to non-localized plastic flow. However, the mechanisms (i.e., microcracking, crystal plasticity, pressure solution etc...

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