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A new model for predicting hydraulic fracture penetration or termination at an orthogonal interface between dissimilar formations

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Petroleum Science 2022年第6期19卷 2810-2829页

作者： Yu Zhao Yong-Fa Zhang Guo-Dong Tian Chao-Lin Wang Jing Bi College of Civil Engineering Guizhou UniversityGuiyang550025GuizhouChina Guizhou Provincial Key Laboratory of Rock and Soil Mechanics and Engineering Safety(Guizhou University) Guiyang550025GuizhouChina School of Civil Engineering Chongqing UniversityChongqing400045China

Vertical height growth of hydraulic fractures(HFs)can unexpectedly penetrate a stratigraphic interface and propagate into neighboring layers,thereby resulting in low gas-production efficiency and high risk of groundwater contamination or fault *** of hydraulic fracture behavior at the interface is of pivotal importance for the successful development of layered *** this paper,a twodimensional analytical model was developed to examine HF penetration and termination behavior at an orthogonal interface between two dissimilar *** model involves changes in the stress singularity ahead of the HF tip,which may alter at the formation interface due to material *** critical stress conditions were considered to assess possible fracture behavior(i.e.,crossing,slippage,and opening)at the ***,this model was verified by comparing its theoretical predictions to numerical simulations and three independent *** agreement with the simulation results and experimental data was observed,which shows the validity and reliability of this ***,a parametric study was conducted to investigate the effects of key formation parameters(elastic modulus,Poisson’s ratio,and fracture toughness)between adjacent *** results indicate that the variation in the introduced parameters can limit or promote vertical HF growth by redistributing the induced normal and shear stresses at the *** the three studied parameters,Poisson’s ratio has the least influence on the formation *** the fracture toughness and elastic modulus of the bounding layer are larger than those of the pay zone layer,the influence of fracture toughness will dominate the HF behavior at the interface;otherwise,the HF behavior will more likely be influenced by elastic modulus.

关键词： Analytical model Hydraulic fracture Interface of dissimilar materials Vertical propagation behavior parametric sensitivity analysis

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SPH-FEM simulations of microwave-treated basalt strength

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Transactions of Nonferrous Metals Society of China 2022年第6期32卷 2003-2018页

作者： Chun YANG Ferri HASSANI Ke-ping ZHOU Feng GAO Ameen TOPA School of Resources and Safety Engineering Central South UniversityChangsha 410083China Department of Mining and Materials Engineering McGill University3450 UniversityFrank Dawson Adams Bldg.MontrealQC H3A 0E8Canada Research Center for Mining Engineering and Technology in Cold Regions Central South UniversityChangsha 410083China Institute of Transportation Infrastructure Universiti Teknologi PETRONASSeri IskandarPerak 32610Malaysia Department of Maritime Technology University Malaysia TerengganuKuala Terengganu 21300Malaysia

Microwave precondition has been highlighted as a promising technology for softening the rock mass prior to rock breakage by machine to reduce drill bit/cutter wear as well as inverse production *** numerically explore the effect of numerical parameters on rock static strength simulation,and determine the numerical mechanical parameters of microwave-treated basalts for future drilling and cutting simulations,numerical models of uniaxial compression strength(UCS)and Brazilian tensile strength(BTS)were established with the coupling of smoothed particle hydrodynamics and finite element method(SPH-FEM).To eliminate the large rock strength errors caused by microwave-induced damage,the cohesion and internal friction angle of microwave-treated basalt specimens with the same microwave treatment parameters were calibrated based on a linear Mohr-Coulomb *** on parametric sensitivity analysis of SPH simulation of UCS and BTS,experimental UCS and BTS values were simultaneously captured according to the same set of calibrated cohesion and internal friction angle data,and the UCS modeling results are in good agreement with experimental ***,the effect of microwave irradiation parameter on the basalt mechanical behaviors was evaluated.

关键词： microwave irradiation microwave-assisted rock breakage rock mechanics smoothed particle hydrodynamics(SPH) parametric sensitivity analysis

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