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On the four-dimensional lattice spring model for geomechanics

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第4期10卷 661-668页

作者： Gao-Feng Zhao Xiaodong Hu Qin Li Jijian Lian Guowei Ma State Key Laboratory of Hydraulic Engineering Simulation and Safety School of Civil Engineering Tianjin University School of Civil Engineering Hebei University of Technology

Recently, a four-dimensional lattice spring model(4D-LSM) was developed to overcome the Poisson’s ratio limitation of the classical LSM by introducing the fourth-dimensional spatial interaction. In this work, some aspects of the 4D-LSM on solving problems in geomechanics are investigated, such as the ability to reproduce elastic properties of geomaterials, the capability of solving heterogeneous problems,the accuracy on modelling stress wave propagation, the ability to solve dynamic fracturing and the parallel computational efficiency. Our results indicate that the 4D-LSM is promising to deal with problems in geomechanics.

关键词： Lattice spring model (LSM) Fourth-dimensional spatial interaction Fracturing geomechanics

Geology and geomechanics of hydraulic fracturing in the Marcellus shale gas play and their potential applications to the Fuling shale gas development

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能源地球科学(英文) 2020年第1期1卷 36-46页

作者： Herong Zheng Jincai Zhang Yuanchang Qi Petroleum Exploration and Production Research Institute SINOPECBeijing100083China Sinopec Tech Houston HoustonTX77056USA

Geological characteristics,geomechanical behavior and hydraulic fracture propagation mechanism in the Marcellus shale gas play are analyzed and compared with China’s Fuling shale *** experiences in hydraulic fracturing and shale gas development in the Marcellus shale gas play are summarized,which might be applicable in other shale *** main factors contributing to the successful development of the Marcellus shale gas play include adoption of advanced drilling and completion technologies,increases of hydraulic fracturing stages,proppant concentration and fluid injection *** geological and geomechanical mechanisms related to those technologies are analyzed,particularly the in-situ stress impacts on hydraulic *** minimum horizontal stress controls where the fractures are initiated,and the maximum horizontal stress dominates the direction of the hydraulic fracture *** fracturing performed in the shale reservoir normally has no stress barriers in most cases because the shale has a high minimum horizontal stress,inducing hydraulic fractures propagating beyond the reservoir zone,resulting in inefficient *** is a common problem in shale plays,and its mechanism is studied in the *** is also found that the on-azimuth well has a higher productivity than the off-azimuth well,because shear fractures are created in the off-azimuth well,causing main fractures to kink and increasing fracture tortuosity and *** Fuling shale gas play has a markedly higher minimum horizontal stress and much smaller horizontal stress *** high minimum horizontal stress causes a much higher formation breakdown pressure;therefore,hydraulic fracturing in the Fuling shale gas play needs a higher treatment pressure,which implies higher difficulty in fracture *** small difference in the two horizontal stresses in the Fuling shale gas play generates shorter and more complex hydraulic fractures,because hydraul

关键词： Marcellus shale Fuling shale Geology geomechanics In-situ stresses Hydraulic fracturing

geomechanics of Hazardous Landslides

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维普期刊数据库

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Journal of Mountain Science 2005年第3期2卷 211-217页

作者： POISEL Rainer BEDNARIK Martin HOLZER Rudolf LIáK Pavel Institute for Engineering Geology Vienna University of Technology Karlsplatz 13 A-1040 Vienna AustriaDept. of Engineering Geology Faculty of Natural Sciences Comenius University Bratislava 842 14 SlovakiaDept. of Engineering Geology Faculty of Natural Sciences Comenius University Bratislava 842 14 SlovakiaDept. of Engineering Geology Faculty of Natural Sciences Comenius University Bratislava 842 14 Slovakia

A catalogue of possible landslide initial failure mechanisms, taking into account the geological setting and the geometry of the slope, the joint structure, the habitus of the rock blocks, as well as the mechanical behaviour of the rocks and of the rock mass (deformation and strength parameters), is presented. Its aim is to give geologists as well as engineers the opportunity to compare phenomena in the field and phenomena belonging to particular mechanisms and to find the mechanism occurring. The presented catalogue of initial landslide mechanisms only comprises the mechanisms having a clearly defined mechanical model that can be divided into empirical relations and into mechanical models, as well as an overview of run out models, which can be divided into empirical relations and into mechanical models.

关键词： geomechanics landslide model

Carbon capture and storage,geomechanics and induced seismic activity

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第6期8卷 928-935页

作者： James P.Verdon Anna L.Stork School of Earth Sciences University of Bristol

Injection of large volumes of carbon dioxide(CO) for the purposes of greenhouse-gas emissions reduction has the potential to induce *** of proposed projects must therefore take steps to reduce the risks posed by this induced *** this paper,we examine the causes of injection-induced seismicity(IIS),and how it should be monitored and modelled,and thereby *** US case studies are found where fluids are injected into layers that are in close proximity to crystalline basement *** investigate this issue further by comparing injection and seismicity in two areas where oilfield wastewater is injected in significant volumes:Oklahoma,where fluids are injected into a basal layer,and Saskatchewan,where fluids are injected into a much shallower *** suggest that the different induced seismicity responses in these two areas are at least in part due to these different injection *** go on to outline two different approaches for modelling IIS:a statistics based approach and a physical,numerical modelling based *** modelling types have advantages and disadvantages,but share a need to be calibrated with good quality seismic monitoring data if they are to be used with any degree of *** therefore encourage the use of seismic monitoring networks at all future carbon capture and storage(CCS) sites.

关键词： Carbon capture and storage(CCS) Induced seismicity geomechanics

A REVIEW ON PHYSICAL MODELING IN geomechanics

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A REVIEW ON PHYSICAL MODELING IN GEOMECHANICS

Geothermo-mechanical alterations due to heat energy extraction in enhanced geothermal systems: Overview and prospective directions

2009 International Symposium on Rock Mechanics:"Rock Characterisation,Modelling and Engineering Design Methods"

作者： M.Moosavi A.Karimi M.Yoosefi The University of Tehran Iran

ISBN: (纸本)9789628014170

Physical modeling has played an important role in studies related to complex tunnel *** method is still used despite the high investment costs for experimental facilities and the contrasting declining numerical modeling *** of limitations in numerical models for correct implementation of soil and rock behavior(*** linear response,strength anisotropy,accumulation of damage within cemented materials etc.) physical models still can be used to calibrate numerical models.A variety of modeling techniques have been developed by researchers to study ground response due to in-situ stress field. These techniques range from two-dimensional models to miniature tunnel boring machines that simulate the process of tunnel excavation and lining installation in a centrifuge. Physical modeling utilizes similarity theory and dimensional *** rules of these theories dictate material and model properties,the manner of applying forces and field stresses,method of model construction,boundary conditions,monitoring and so on. In this paper,methods of making various physical models and their conditions together with the parameters that need to be determined accurately are ***,a model is tested in the laboratory for studying rules that is reviewed in this paper. Results of the paper show that physical models can provide valuable data that can be used to validate and calibrate numerical models.A visual control that provides a deep insight for the researcher about different modes of instability that gradually builds up is also a valuable output of physical modeling. Different methods have been developed to simulate the process of tunnel construction.A pulling pipe method is used in this study the results of which are shown in the paper.

关键词： Physical modeling geomechanics Dimensional analysis Similarity theory

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cnki会议

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Deep Underground Science and Engineering 2024年第3期3卷 256-268页

作者： Mary C.Ngoma Oladoyin Kolawole Olufemi Olorode John A.Reif Jr.Department of Civil and Environmental EngineeringNew Jersey Institute of TechnologyNewarkUSA Department of Petroleum Engineering Louisiana State UniversityBaton RougeUSA

Geothermal energy from deep underground (or geological) formations,with or without its combination with carbon capture and storage (CCS),can be a key technology to mitigate anthropogenic greenhouse gas emissions and meet the2050 net‐zero carbon emission *** resources in low‐permeability and medium‐and high‐temperature reservoirs in sedimentary sequence require hydraulic stimulation for enhanced geothermal systems (EGS).However,fluid migration for geothermal energy in EGS or with potential CO_(2)storage in a CO_(2)‐EGS are both dependent on the in situ flow pathway network created by induced fluid *** thermo‐mechanical interactions can be complex and induce varying alterations in the mechanical response when the working fluid is water (in EGS) or supercritical CO_(2)(in CO_(2)‐EGS),which could impact the geothermal energy recovery from geological ***,there is a need for a deeper understanding of the heat extraction process in EGS and CO_(2)‐*** study presents a systematic review of the effects of changes in mechanical properties and behavior of deep underground rocks on the induced flow pathway and heat recovery in EGS reservoirs with or without CO_(2)storage in CO_(2)‐***,we proposed waterless‐stimulated EGS as an alternative approach to improve heat energy extraction in ***,based on the results of our literature review and proposed ideas,we recommend promising areas of investigation that may provide more insights into understanding geothermo‐mechanics to further stimulate new research studies and accelerate the development of geothermal energy as a viable clean energy technology.

关键词： CO_(2)-EGS enhanced geothermal systems geomechanics geothermal energy underground thermal energy

Geomechanical modelling of cold heavy oil production with sand

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Petroleum 2022年第1期8卷 66-83页

作者： Assef Mohamad-Hussein Pablo Enrique Vargas Mendoza Paolo Francesco Delbosco Claudia Sorgi Vincenzo De Gennaro Surej Kumar Subbiah Qinglai Ni Jose Maria Segura Serra MRLakshmikantha Jos Alvarellos Iglesias Rebecca Daniels Schlumberger geomechanics Center of Excellence Gatwick AirportUnited Kingdom Schlumberger Calle Alvarez de Baena 4Planta Baja28006MadridSpain Schlumberger Av.A.NobelZI NordPau64000France Schlumberger 45th Floor Tornado TowerWest BayMajlis Al TaawonDohaQatar Repsol Technology Center MostolesMadridSpain

The contribution of geomechanics to provide a rigorous quantification of porosity changes and associated permeability changes is often neglected when considering hydrocarbon ***,it often has significant effects on production rates and ultimate *** the cold heavy oil production with sand(CHOPS)technique,geomechanics is the key for reservoir simulations and promoting successful *** fact,the technique employed in CHOPS significantly affects the stress state within the reservoir by inducing“on-purpose”formation *** is not only vital to comprehend the behaviour of the reservoir during production,but it is crucial to identify how to harness that behaviour to improve *** order to simulate the mechanical behaviour of unconsolidated sand material,an elastoplastic damage model was ***-flow-geomechanical modelling was then performed for predicting individual well behaviour and overall field *** combined effect of fluid-flow and geomechanics improved predictions with respect to oil,water,and gas production rates at key *** rates matched satisfactorily most of the *** addition,the onset and propagation of equivalent wormhole networks were quantified throughout the production *** enabled quantification of the volume of produced sand at individual *** comparisons between the measured and simulated sand volume rate at well locations showed reasonable *** calibrated models can then be used for the placement of new wells to optimize production.

关键词： CHOPS Numerical simulation Sanding geomechanics

A review of methods,applications and limitations for incorporating fluid flow in the discrete element method

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第3期14卷 1005-1024页

作者： Tuo Wang Fengshou Zhang Jason Furtney Branko Damjanac Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai200092China Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China Itasca Consulting Group Inc.MinneapolisMN55041USA

The past decade has witnessed the substantial growth in research interests and progress on the subject of coupled hydro-mechanical processes in rocks and soils,driven mainly by the surge of research in unconventional hydrocarbon reservoirs and associated *** coupling techniques have been developed to include the effects of fluid flow in the discrete element method(DEM),and the techniques have been applied to a variety of geomechanical *** these coupling methods have been successfully applied in various engineering fields,no single fluid/DEM coupling method is universal due to the complexity of engineering problems and the limitations of the numerical *** researchers and engineers,the key to solve a specific problem is to select the most appropriate fluid/DEM coupling method among these modeling *** purpose of this paper is to give a comprehensive review of fluid flow/DEM coupling methods and relevant *** their importance,the availability or unavailability of best practice guidelines is *** theoretical background and current status of DEM are introduced first,and the principles,applications,and advantages and disadvantages of different fluid flow/DEM coupling methods are ***,a summary with speculation on future development trends is given.

关键词： Hydro-mechanical process Fluid/discrete element method(DEM) coupling geomechanics Numerical modeling

Mechanical behavior of salt rocks: A geomechanical model

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Petroleum 2023年第4期9卷 508-525页

作者： Saeed Shad Negar Razaghi Davood Zivar Soheil Mellat Department of Chemical and Petroleum Engineering Sharif University of TechnologyTehranIran PanTerra Geoconsultants BV LeiderdorpNetherlands

The geomechanical behavior of salt rocks is a significant concern during drilling and development operations in some hydrocarbon reservoirs and underground gas storage *** this study,the static and dynamic salt rock geomechanical properties from a field in southwest Iran were evaluated using experiments such as waves'velocities,and thermo-mechanical coupled uniaxial and triaxial compression *** a result and by considering both the petrophysical well logs and laboratory data of the waves’velocities,it is observed that the elastic properties of the core samples are concentrated within a narrow range unless an abnormality causes *** results of uniaxial compression tests showed that rock strength decreases with increasing temperature *** addition,the reduction of rock strength was observed with increasing porosity of the core samples as *** the case of triaxial compression tests,applying confining pressure on the core sample caused an increment in rock strength,while temperature decreased rock *** temperature also increased cohesion and decreases friction *** ratio of changes in stress to strain was used to investigate the dynamic changes in the geomechanical *** maximum 0.25 damage factor was observed for the core samples for different definitions of the damage ***,we propose a novel analytical model to predict the stress-strain behavior of salt rocks at different *** model was validated using experimental results and indicated a satisfactory accuracy.

关键词： Salt rock Underground gas storage geomechanics Dynamic and static mechanical properties Transition zone Damage factor