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Modeling fluid injection in fractures with a reservoir simulator coupled to a boundary element method

Abstract

We describe an algorithm for modeling saturated fractures in a poroelastic domain in which the reservoir simulator is coupled with a boundary element method. A fixed stress splitting is used on the underlying fractured Biot system to iteratively couple fluid and solid mechanics systems. The fluid system consists of Darcy’s law in the reservoir and is computed with a multipoint flux mixed finite element method, and a Reynolds’ lubrication equation in the fracture solved with a mimetic finite difference method. The mechanics system consists of linear elasticity in the reservoir and is computed with a continuous Galerkin method, and linear elasticity in the fracture is solved with a weakly singular symmetric Galerkin boundary element method. This algorithm is able to compute both unknown fracture width and unknown fluid leakage rate. An interesting numerical example is presented with an injection well inside of a circular fracture.

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Ganis, B., Mear, M.E., Sakhaee-Pour, A. et al. Modeling fluid injection in fractures with a reservoir simulator coupled to a boundary element method. Comput Geosci 18, 613–624 (2014). https://doi.org/10.1007/s10596-013-9396-5

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  • DOI: https://doi.org/10.1007/s10596-013-9396-5

Keywords

  • Saturated fracture
  • Poroelasticity
  • Multipoint flux mixed finite element
  • Mimetic finite difference
  • Galerkin finite element
  • Boundary element