Simulation of coupled multiphase flow and geomechanics in porous media with embedded discrete fractures

Cusini, Matteo; White, Joshua A.; Castelletto, Nicola; Settgast, Randolph R.

doi:10.1002/nag.3168

Title: Simulation of coupled multiphase flow and geomechanics in porous media with embedded discrete fractures

Journal Article · Sat Dec 05 00:00:00 EST 2020 · International Journal for Numerical and Analytical Methods in Geomechanics

DOI:https://doi.org/10.1002/nag.3168· OSTI ID:1785907

^[1];

^[1]; Settgast, Randolph R. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

In fractured natural formations, the equations governing fluid flow and geomechanics are strongly coupled. Hydrodynamical properties depend on the mechanical configuration, and they are therefore difficult to accurately resolve using uncoupled methods. In recent years, significant research has focused on discretization strategies for these coupled systems, particularly in the presence of complicated fracture network geometries. In this work, we explore a finite-volume discretization for the multiphase flow equations coupled with a finite-element scheme for the mechanical equations. Fractures are treated as lower dimensional surfaces embedded in a background grid. Interactions are captured using the embedded discrete fracture model (EDFM) and the embedded finite element method (EFEM) for the flow and the mechanics, respectively. This nonconforming approach significantly alleviates meshing challenges. EDFM considers fractures as lower dimension finite volumes that exchange fluxes with the rock matrix cells. The EFEM method provides, instead, a local enrichment of the finite-element space inside each matrix cell cut by a fracture element. Both the use of piecewise constant and piecewise linear enrichments are investigated. They are also compared to an extended finite element approach. One key advantage of EFEM is the element-based nature of the enrichment, which reduces the geometric complexity of the implementation and leads to linear systems with advantageous properties. Synthetic numerical tests are presented to study the convergence and accuracy of the proposed method. It is also applied to a realistic scenario, involving a heterogeneous reservoir with a complex fracture distribution, to demonstrate its relevance for field applications.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1785907

Report Number(s):: LLNL-JRNL-811840; 1018975

Journal Information:: International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 45, Issue 5; ISSN 0363-9061

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Simulation of coupled multiphase flow and geomechanics in porous media with embedded discrete fractures

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