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Rock Mechanics Bulletin 2024年第1期3卷 55-63页

作者： cexuan liu Emmanuel Detournay Fengshou Zhang Department of Geotechnical Engineering Tongji UniversityShanghai200092China Key Laboratory of Geotechnical&Underground Engineering of Ministry of Education Tongji UniversityShanghai200092China Department of Civil Environmentaland Geo-EngineeringUniversity of MinnesotaMinneapolis55455MNUSA

This paper describes a numerical algorithm for solving the classic problem of a plane strain(KGD)fracture propagating in an impermeable elastic medium with zero *** method,which takes advantage of the self-similar nature of the solution,combines a domain-based scheme to solve the elasticity equations and a finite volume method to solve the nonlinear lubrication *** work represents a first step towards developing a model able to account for pore pressure diffusion in the medium and corresponding poroelastic effects,noting that these processes are more efficiently solved using a domain-based rather than a boundary integral *** enhance the efficiency and accuracy of the numerical scheme,the far-field crack asymptotics is embedded in the discretized elastic relationship between the fluid pressure and the crack opening,while the coupled fluid-solid tip asymptote is enforced in a weak form when solving the nonlinear lubrication *** proposed technique yields results that closely match the analytical solution,even with a coarse *** approach offers potential for addressing more complex hydraulic fracturing problems in the future.

关键词： Hydraulic fracturing Numerical simulation Domain-based method Far-field asymptotic boundary Tip asymptote

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Evaluation of fault stability and seismic potential for Hutubi underground gas storage due to seasonal injection and extraction

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Underground Space 2023年第6期13卷 74-85页

作者： cexuan liu Fengshou Zhang Quan Wang Bin Wang Qi Zhang Bin Xu Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China Key Laboratory of Geotechnical&Underground Engineering of Ministry of Education Tongji UniversityShanghai 200092China China National Petroleum Company Xinjiang Oil FieldKaramayXinjiang 834000China School of Civil Engineering Southeast UniversityNanjing 211189China Origin Geomechanics Inc. CalgaryAlbertaT3H 0X6Canada Department of Civil Engineering University of CalgaryCalgaryAlbertaT2N 1N4Canada

The Hutubi gas field was put into production in 1998 and then converted into an underground gas storage(UGS)facility in 2013,and since then a cluster of earthquakes associated with seasonal injection and extraction activities have been recorded *** evaluate the fault stability and seismic potential,we established a pseudo-3D geomechanical model to simulate the process of seasonal injection and *** pore pressures from 1998 to 2019 were obtained through multiphase reservoir simulation and validated by history matching the field injection and production *** then imported pore pressures into the geomechanical model to simulate the poroelastic perturbation on faults for over 20 *** fidelity of this model was validated by comparing the simulated surface deformation with global positioning system(GPS)measured *** used Coulomb failure stress(CFS)as the indicator for the likelihood of fault *** simulation results show that the location of the induced earthquake cluster was within the positive Coulomb stress perturbation(DCFS)area,in which fault slippage was *** addition,DCFS at the earthquake location kept increasing after the injection *** findings could explain the induced earthquakes with the Coulomb failure stress ***,we conducted a parameter sensitivity study on the dominant factors such as the maximum operating pressure(MOP),frictional coefficient,and dip angle of the pre-existing *** results indicate that the magnitude of DCFS caused by seasonal injection and extraction decreases with distance;MOPs are constrained to 32.9,36.2,and 39.5 MPa according to different DCFS thresholds;the critical dip angle ranges are 0-20°and 80°-100°;and strengthening the fault friction can either increase or decrease the seismic *** study can help determine the MOP for Hutubi underground gas storage(HTB UGS)and provide a framework for simulating the potential causes of induced seismicity for othe

关键词： Underground gas storage Fault stability Seismic potential GPS Induced earthquake Coulomb stress perturbation

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