Day 2 Wed, March 29, 2023 2023
DOI: 10.2118/212241-ms
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A Sequentially Coupled THM Model for Fractured Enhanced Geothermal Systems using XFEM and Hybrid EDFM and MINC Models

Abstract: The long-term fluid circulation of Enhanced Geothermal Systems (EGS) involves complex coupled Thermal-Hydrological-Mechanical (THM) processes dominated by hydraulic and induced natural fractures. The hydraulic fracture of arbitrary shape in response to pressure changes and thermal strains can be handled by the three-dimensional (3D) eXtended Finite Element Method (XFEM). The induced/natural fractures are incorporated into the model and treated as one continuum of the Multiple INteracting Continua (MINC) for th… Show more

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Cited by 2 publications
(2 citation statements)
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“…where 𝒅 can be decomposed into the volumetric and deviatoric parts (i.e., ε 𝑣 and ė, respectively), which satisfies 𝟏 ∶ 𝗰 𝑡 ∶ 𝒆 = 0. By substituting Equation ( 57) into Equation (36), we obtain…”
Section: Extended Fixed Stress Sequential Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…where 𝒅 can be decomposed into the volumetric and deviatoric parts (i.e., ε 𝑣 and ė, respectively), which satisfies 𝟏 ∶ 𝗰 𝑡 ∶ 𝒆 = 0. By substituting Equation ( 57) into Equation (36), we obtain…”
Section: Extended Fixed Stress Sequential Methodsmentioning
confidence: 99%
“…30 In time discretization, we take the fixed stress sequential implicit method, where individual problems of flow and geomechanics are solved implicitly and sequentially. Specifically, the fixed stress method solves the flow problem first by fixing the total stress rate locally and the geomechanics problem is solved at the next step [31][32][33][34][35][36] In this sequential approach, one may iterate this sequential procedure at each time step until convergence, where the solution is then identical to that from the monolithic approach, or perform a fixed number of iterations per time step. It is common to employ a staggered method (one iteration per time step), similar to the fractional step method.…”
Section: Introductionmentioning
confidence: 99%