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Fracture Reactivation Modeling in a Depleted Reservoir

Computer Modeling in Engineering & Sciences 2021年第1期126卷 217-239页

作者： Mengtao Cao Weiguo Liang Shunde Yin Maurice B.Dusseault College of Mining Engineering Taiyuan University of TechnologyTaiyuan030024China Key Laboratory of In Situ Modified Mining of Ministry Education Taiyuan University of TechnologyTaiyuan030024China Department of Civil and Environmental Engineering University ofWaterlooWaterlooN2L 3G1Canada Department of Earth and Environmental Sciences University of WaterlooWaterlooN2L 3G1Canada

Injection-induced fracture reactivation during hydraulic fracturing processes in shale gas development as well as coal bed methane(CBM)and other unconventional oil and gas recovery is widely investigated because of potential permeability enhancement *** attention is paid to induced fracture reactivation during oil and gas production and its impacts on reservoir permeability,despite its relatively common *** production,a reservoir tends to shrink as effective stresses increase,and the deviatoric effective stresses also *** changes in the principal effective stresses may cause Coulomb fracture slip in existing natural fractures,depending on their strength,orientation,and initial stress *** this work,an extended finite element model with contact constraints is used to investigate different fracture slip scenarios induced by general reservoir pressure *** numerical experiments assess the effect of Young’s modulus,the crack orientation,and the frictional coefficient of the crack surface on the distribution of stress and displacement after some reservoir *** show that the crack orientation significantly affects the state of stress and displacement,particularly in the vicinity of the *** can only occur in permitted directions,as determined by the magnitudes of the principal stresses and the frictional ***,a larger frictional coefficient(i.e.,a rougher natural fracture surface)makes the crack less prone to shear slip.

关键词： Fracture reactivation depleted reservoir finite element contact constraints

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REDUCED AUGMENTED LAGRANGIAN BI-CONJUGATE GRADIENT METHOD FOR IMPACT-contact PROBLEMS

引用

Acta Mechanica Solida Sinica 1998年第3期11卷 241-252页

作者： Li Nansheng Sha Desong Sun Huanchun Dalian Univ Technol Dept Engn Mech Dalian 116023 Peoples R China

To avoid the numerical oscillation of the penalty method andnon-compatibility with ex- plicit operators of conventional Lagrangemultiplier methods used in transient contact problems to en- forcesurface contact conditions, a new approach to enforcing surfacecontact constraints for the tran- sient nonlinear finite elementproblems, referred to as 'the reduced augmented Lagrangianbi-conjugate gradient method (ALCG)', is developed in this *** on the nonlinear constrained optimization theory and iscompatible with the explicit time integration scheme, this approachcan also be used in implicit scheme naturally.

关键词： impact-contact problems contact constraints explicit scheme

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