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Geomechanics and Engineering
  Volume 10, Number 4, April 2016, pages 423-436

A coupled geomechanical reservoir simulation analysis of CO2 — EOR: A case study
Ayub Elyasi, Kamran Goshtasbi and Hamid Hashemolhosseini

    Currently, there is a great interest in the coupling between multiphase fluid flow and geomechanical effects in hydrocarbon reservoirs and surrounding rocks. The ideal solution for this coupled problem is to introduce the geomechanical effects through the stress analysis solution and implement an algorithm, which assures that the equations governing the flow and stress analyses are obeyed in each time step. This paper deals with the implementation of a program (FORTRAN90 interface code), which was developed to couple conventional reservoir (ECLIPSE) and geomechanical (ABAQUS) simulators, using a partial coupling algorithm. The explicit coupled hydro-mechanical behavior of Iranian field during depletion and CO2 injection is studied using the soils consolidation procedure available in ABAQUS. Time dependent reservoir pressure fields obtained from three dimensional compositional reservoir models were transferred into finite element reservoir geomechanical models in ABAQUS as multi-phase flow in deforming reservoirs cannot be performed within ABAQUS. The FEM analysis of the reservoir showed no sign of plastic strain under production and CO2 injection scenarios in any part of the reservoir and the stress paths do not show a critical behavior.
Key Words
    coupled; hydro-mechanical; FEM; plastic strain; stress path
(1) Ayub Elyasi, Kamran Goshtasbi:
Department of Mining Engineering, Tarbiat Modares University, Tehran, Iran;
(2) Hamid Hashemolhosseini:
Department of Mining Engineering, Isfahan University of Technology, Isfahan, Iran.

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