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Methods for FEM stress initialization based on stress functions, and application to a reservoir cross-section

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Aliguer Piferrer, IgnasiMés informacióMés informació
Rafels Ybern, Carles
Jaqués Adell, IreneMés informacióMés informació
Carol, IgnacioMés informacióMés informacióMés informació
Prat Catalán, PereMés informacióMés informacióMés informació
Lakashmikhanta, Ramasesha
Segura Segarra, José María
Document typeConference report
Defense date2013
PublisherOnePetro
Rights accessRestricted access - publisher's policy
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
An accurate description of the in-situ stress field in a rock mass is crucial in different areas of geo-engineering such as: underground excavations, hydrocarbon extraction, CO2 storage, hydraulic fracture etc. In this paper, a novel methodology to numerically generate the in-situ stress state within the Finite Elements framework is presented. It involves two steps: 1) an estimate of the stress components is given for integration point of the discretization, and 2) global equilibrium is verified and re-balancing nodal forces are applied if needed. While the second step is a closed procedure based only on statics, the estimate of the in-situ stress field can be done in different ways in order to incorporate all the information available of the rock mass. In this paper, more traditional approaches are discussed and a new procedure based on the Airy stress function is described, in order to generate a stress state proposal at each Gauss point of the domain. Finally, the performance of different approaches is illustrated with a reservoir example.
CitationAliguer, I., Rafels, C., Jaques, I., Carol, I., Prat, P., Lakshmikantha, R.M., Segura, J. Methods for FEM stress initialization based on stress functions, and application to a reservoir cross-section. A: U.S. Rock Mechanics/Geomechanics Symposium. "50th U.S. Rock Mechanics/Geomechanics Symposium: 26-29 June 2016, Houston, Texas". Houston, TX: OnePetro, 2013, p. 1-7. 
URIhttp://hdl.handle.net/2117/98158
Publisher versionhttps://www.onepetro.org/conference-paper/ARMA-2016-446?sort=&start=0&q=ARMA-2016-446&from_year=&peer_reviewed=&published_between=&fromSearchResults=true&to_year=&rows=10#
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  • Departament d'Enginyeria Civil i Ambiental - Ponències/Comunicacions de congressos [1.190]
  • MECMAT - Mecànica de Materials - Ponències/Comunicacions de congressos [75]
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