An Approach for Modeling Rock Discontinuous Mechanical Behavior Under Multiphase Fluid Flow Conditions

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• 作者：Peng-Zhi Pan (1) (2)
  Jonny Rutqvist (2)
  Xia-Ting Feng (1)
  Fei Yan (1)
  
• 关键词：Rock discontinuous cellular automaton ; TOUGH2 ; CO2 injection ; Discontinuity ; Multiphase flow
• 刊名：Rock Mechanics and Rock Engineering
• 出版年：2014
• 出版时间：March 2014
• 年：2014
• 卷：47
• 期：2
• 页码：589-603
• 全文大小：2,581 KB
• 作者单位：Peng-Zhi Pan (1) (2)
  Jonny Rutqvist (2)
  Xia-Ting Feng (1)
  Fei Yan (1)
  
  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China
  2. Lawrence Berkeley National Laboratory, MS 90-1116, Berkeley, CA, 94720, USA
  
• ISSN：1434-453X

文摘

In this paper, the two computer codes TOUGH2 and RDCA (for “rock discontinuous cellular automaton- are integrated for coupled hydromechanical analysis of multiphase fluid flow and discontinuous mechanical behavior in heterogeneous rock. TOUGH2 is a well-established code for geohydrological analysis involving multiphase, multicomponent fluid flow and heat transport; RDCA is a numerical model developed for simulating the nonlinear and discontinuous geomechanical behavior of rock. The RDCA incorporates the discontinuity of a fracture independently of the mesh, such that the fracture can be arbitrarily located within an element, while the fluid pressure calculated by TOUGH2 can be conveniently applied to fracture surfaces. We verify and demonstrate the coupled TOUGH–RDCA simulator by modeling a number of simulation examples related to coupled multiphase flow and geomechanical processes associated with the deep geological storage of carbon dioxide—including modeling of ground surface uplift, stress-dependent permeability, and the coupled multiphase flow and geomechanical behavior of fractures intersecting the caprock.