Effect Of The In-Situ Stress Field On Casing Failure *
|
|
- Bruce Knight
- 6 years ago
- Views:
Transcription
1 Effect Of The In-Situ Stress Field On Casing Failure * Tang Bo Southwest Petroleum Institute, People's Republic of China Lian Zhanghua Southwest Petroleum Institute, People's Republic of China Abstract Based on the geologic structure, seismic data, exploitation information and the data of rock mechanics tests in Qinghai oil field, the finite element mechanics model of delaminated in-situ stress with a great deal of complicated faults was set up with ANSYS software. The stress concentration area, tensile stress area and compression stress area of the oil field were determined according to the rock s Drucker-Prager rule. The distribution of casing failure in the oil field indicated that it was closely relative to those areas. By applying the study of the paper and taking some preventing measures, the casing failure was controlled and the economic benefit had been evidently growing up. This paper offers a new study method to prevent casing failure and the theoretic reference for the mechanism study of casing failure. Introduction A casing is a steel pipe string to protect the wall of oil, gas or water wells from collapsing, divide the stratum fluids and ensure the productive activities in gear. Along the complicated geologic structures, the casing stresses will change in company with the in-situ stresses. Because there are many differences in the geologic structures, geologic activities and material properties of underground rocks, it is very difficult to get the distributing law of the in-situ stresses by analytical methods and by simple measurement in shallow layers of earth crust. The best way to analyze the strata is the inversion method based on known conditions of the faults, the mechanisms of the regional seismic source, the stress-drop of the little seismic and the ambient stress field. The finite element method (FEM) is the most effective method [1~3] to deal with the complex system, although there are some problems, such as simplified geometry model, constitutive relation of rock, conditions and so on. This paper studied the effects of the in-situ stress on casing failure by FEM, based on the measured and statistical data of Yuejing II Oil Field in Caidam Basin, Qinghai province, China. The typical formation stress field was analyzed, in which the casing failure has been severely occurring. Analysis Studying formation Geologic structure The structure of Yuejing II Oil Field is a depositional trap oil reservoir controlled by structure, affected by lithology. The basic structural feature is an anticline with complicated faults. The structure s strike is 160 degree and the area is 5.7 km 2. Affected by two great reverse faults, Allar Fault and VII Fault, the secondary faults have developed abundantly. There are more than ten faults only in the main part of the structure. * This paper was supported by China National Science Foundation (Project No ) and Supported by CNPC Innovation Foundation.
2 Formation in-situ stress method Because of abundant faults in the oil field, 3D model will be not exact adequate for including so many secondary faults and the branches of them. In order to get the detail distribution of the area s in-situ stress and analyze the casing failure in the area, the 2D formation model was set up and analyzed in the paper. The angle of beddings varies from 10 to 14,seen as Figure 1, so the formations could be thought approximately as in different plates, of which the 3D model are made up. However, the quantities of casing failure in different deformations are difference, seen as Table 1. Figure 1. The profile in elevation of wells (II173 II146) in Yuejin II Oil Field (red lines indicate faults, top is well numbers) Table 1 The statistics of deformations occurring casing failure NO. Formation Occurring casing failure Quantity Proportion % 1 N N E E others Table 1 indicates that the casing failure mainly takes place in formation N 1, which is just the oil stratum. The depth of the formation is from 900m to 1100m and its rock is mainly the siltstone. To analyze the relationship between the casing failure and the in-situ stress, the formation was studied in detail. Mechanics model Parameters of the faults K 5 structure belongs to formation N 1, seen as Figure 2. The figure indicates that the formation has abundant faults and branches with complicated strike. The basic parameters of those faults are listed in Table 2:
3 Figure 2. The cross profile of structure K 5 Table 2. Parameters of faults in structure K 5 No. Strike trend obliquity Distance, m Length, km formation Fault character 2 NE ± 50 ~60 40~80 1.5± E 3 -N 2 Reverse normal fault 4 NE ± 50 ~60 10~30± <1.0 E 3 -N 2 Reverse normal fault 6 SE80 10 ± 50 ~60 10~30± 1.5± E 3 -N 2 Reverse normal fault 8 almost EW 180 ± 70 ± 20~50± >1.0 N 1 -N 2 Reverse normal fault 10 almost EW-NE 130 ~ ~50± >1.0 E 3 -N 2 Reverse normal fault 12 NE ± 60 ± 30± 1.0± E 3 -N 1 normal fault 14 almost EW N 60 ± >50 1.0± E 3 -N 2 Forward normal fault 16 NE ± 60 ± 10~20± 0.5± N 2 Normal fault 1 NW15 60 ~ ~50± 1.0± E 3 -N 2 Forward normal fault 3 NW15 60 ± 70 ± >50± 1.0± E 3 -N 2 Forward normal fault 5 NW15 61 ± 70 30± 1.0± E 3 -N 2 Forward normal fault 7 almost SN W 70 ± / / N 1 Reverse normal fault 9 almost EW N 70 ± 30± <1.0 E 3 -N 2 Forward normal fault 11 NE ± 60 ± 40± 0.5± E 3 -N 1 normal fault 13 NE70 ± 340 ± 60 ± 3± <1.0 E 3 -N 1 normal fault
4 Geometrical model Seen as Figure 3, the geometrical model, 2100m 2100m, of K 5 structure was set up, including all of the wells of the oil field. According to the geologic data, seismic data and exploitation information, the length, width and strike of every fault were described exactly in the model. Figure 3. The geometrical model of structure K 5 For computational accuracy, the 8-node plane element was chosen, during discretization of the model, (seen as Figure 4). Figure 4. The mesh model of structure K 5 Parameters of the rocks For describing exactly the properties of rocks, Drucker-Prager yield criterion was used in the model. The yield criterion is described as [4] : where α I + J k 0 ( 1 ) 1 2 =
5 sinϕ α =, sin ϕ k = 3c cosϕ 3 + sin 2 ϕ and c is the cohesion value, and φ is the angle of internal friction. In fact, Drucker-Prager yield surface is a circular cone, which corresponds to the outer apices of the hexagonal Mohr-Coulomb yield surface, (seen as Figure 5). Figure 5. geometric representation of stress [4] (a) the spacial yield surface of main stresses (b) the yield curves in π plane 1- Mohr-Coulomb yield surface 2-Drucker-Prager yield surface Table 3. Parameters of rocks No. structure rocks Young's modulus (MPa) Poisson ratio Cohesion (MPa) angle of internal friction (degree) 1 Stratum N 1 siltstone faults argillaceous sandstone According to the data of laboratory tests on cores collected from the stratum, and considering the difference of properties of rocks between in stratum and in laboratory, parameters of the rocks were chosen as Table 3. Boundary conditions Load conditions Being 1100m depth under ground, and according to the environment, northern Allar Fault and Eastern VII Fault, the model was dealt as a plane strain problem. Hydraulic fracturing data indicate that the direction of maximum main stress of the whole oil field is almost east-west, so the press of 1.2 times of gravity of superincumbent stratum was applied on the east boundary of the model and 0.8 times on the north boundary of the model. Displacement condition Firstly, for excluding the space freedom degree of whole model, west and south boundaries was restricted in their normal directions. In addition, according to the information of exploitation and seism, the horizontal slippages (including values and directions) were applied on different faults (on the lines of the faults in the model). Figure 6 displays the all boundary conditions.
6 Figure 6. The boundary conditions of structure K 5 Analysis Results & Discussion Relationship between in-situ stress field and casing failure The Von Mises equivalent stress varies mostly from 15 to 40 MPa (seen as Figure 7). However, there is an area of stress concentration in the northwest part of the stratum, in which the stress varies from 40 to 70 MPa and the maximum stress reaches up to 117 MPa. The statistical data indicate 14 wells have occurred casing failure in the stress concentration area (seen as Figure 8), and the average depth of casing failure is 1051m, which is adjacent to the depth of the studied stratum (1100m). It is said that the casings in the area of stress concentration are more possible to occur failure. At the same time, the analysis is more credible. Figure 7. The Von Mises stress of structure K 5
7 Figure 8. The wells occurring casing failure in the stress concentration area The stress concentration occurs mainly nearby the faults, especially, at the ends of some faults which are just the directions of extending trend. During the course of the exploitation, the slippage of fault is the main reason of occurring casing failure. What do lead to the slippage? While water is injected into the stratum, the rocks with clay will be hydrated, dilate, and creep, the shear strength of rock will decrease. If the pressure of injecting is greater than the gravity of superincumbent stratum or the shear strength of the rocks, the faults will glide relatively. Relationship between main stresses and casing failure The main stresses vector diagram of the stratum (seen as Figure 9) shows that directions of main stresses have changed because of the slippage of faults, even the direction of maximum stress changes to that of minimum stress in some areas, or the directions of main stresses occur reversion in other areas. The maximum main stress is mostly tensile stress and the direction is horizontal in the whole area, but its directions accord with the strikes of faults in the stress concentration area with the effects on rock materials, faults slippage, structure s changing, etc. By contraries, the minimum main stress is mostly compression stress and the direction is vertical in the whole area, but its directions accord with the normal of faults in the stress concentration area. Figure 9. The vector of main stresses of structure K 5
8 The casing will be applied non-uniform loads when the maximum stress is not equal to the minimum stress. Some studies indicate that the casing collapse strength will decrease rapidly under the non-uniform loads and the curve of decreasing is a parabola with the increasing of non-uniform degree. For example, while the ratio of two main stresses is from 1.5 to 2, the casing collapse strength under non-uniform load is only from 75% to 80% of that under uniform load. It is said that the non-uniform is one of main reasons causing the casing failure, too. Especially, if one main stress is tensile stress and the other main stress is pressure stress, the casing failure is easier to occur. There are other reasons causing the casing failure from the analysis. When the tensile stress strengths are about 10 MPa, the rocks are cracked easily under tensile stress, which leads to a lot of cracks and the redistributing of stresses around the well. The faults slippage causes the decreasing of the stability of sand arc, the increasing of sand production and the server non-uniform loads on casing. Conclusions After the analysis, there are two reasons that casing failure centralizes in oil stratums. The first is that the non-uniform degree of two main stresses aggrandizement during the course of the exploitation. The second is that the collapse strength of casings in the stratum is lower than in other stratums because the casings in oil stratums are often perforated. The FEA is an effective method to deal with the casing failure under the in-situ stress. The analysis in the paper offer theoretical reference and test data for study on casing failure. References [1]. Lian Zhanghua, Han Jiangzeng, Tang Bo et al, Research on the Casing Failure Mechanism of Complex Formation by Numerical Simulation (in Chinese) [J], Natural Gas Industry, V.22, No. 1,P48~51 [2]. Wang Zhongmao, Lu Wangheng, Hu Jiangming. The Mechanism of the Prevention and Cure of Casing Failure on Oil and Water Wells in Oil Field (in Chinese)[M], Beijing, Petroleum Industry Press, 1994,P102~123 [3]. Li Zhiming, Zhang Jinzhu, The In-situ Stress and Oil & Gas Exploratory Development (in Chinese) [M], Beijing, Petroleum Industry Press, 1997:P143~177 [4]. Zheng Tianyu, The Theoretical Basis of Elastic, Plastic and Viscous Mechanics of Rock (in Chinese) [M],Beijing, Coal Industry Press, 1988
University of Sheffield The development of finite elements for 3D structural analysis in fire
The development of finite elements for 3D structural analysis in fire Chaoming Yu, I. W. Burgess, Z. Huang, R. J. Plank Department of Civil and Structural Engineering StiFF 05/09/2006 3D composite structures
More informationON THE FACE STABILITY OF TUNNELS IN WEAK ROCKS
33 rd 33 Annual rd Annual General General Conference conference of the Canadian of the Canadian Society for Society Civil Engineering for Civil Engineering 33 e Congrès général annuel de la Société canadienne
More informationThe Frictional Regime
The Frictional Regime Processes in Structural Geology & Tectonics Ben van der Pluijm WW Norton+Authors, unless noted otherwise 1/25/2016 10:08 AM We Discuss The Frictional Regime Processes of Brittle Deformation
More informationBrittle Deformation. Earth Structure (2 nd Edition), 2004 W.W. Norton & Co, New York Slide show by Ben van der Pluijm
Lecture 6 Brittle Deformation Earth Structure (2 nd Edition), 2004 W.W. Norton & Co, New York Slide show by Ben van der Pluijm WW Norton, unless noted otherwise Brittle deformation EarthStructure (2 nd
More informationFinite Element Simulation of Fracture Initiation Pressure of Coal Seam Gas Well Perforation Completion
Finite Element Simulation of Fracture Initiation Pressure of Coal Seam Gas Well Perforation Completion Tong Du a, Jize Zuo b School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318,
More informationRock Failure. Topics. Compressive Strength Rock Strength from Logs Polyaxial Strength Criteria Anisotropic Rock Strength Tensile Strength
Rock Failure Topics Compressive Strength Rock Strength from Logs Polyaxial Strength Criteria Anisotropic Rock Strength Tensile Strength Key Points 1. When rock fails in compression, the compressive stress
More informationThe Mine Geostress Testing Methods and Design
Open Journal of Geology, 2014, 4, 622-626 Published Online December 2014 in SciRes. http://www.scirp.org/journal/ojg http://dx.doi.org/10.4236/ojg.2014.412046 The Mine Geostress Testing Methods and Design
More information3D Finite Element Modeling of fault-slip triggering caused by porepressure
3D Finite Element Modeling of fault-slip triggering caused by porepressure changes Arsalan Sattari and David W. Eaton Department of Geoscience, University of Calgary Suary We present a 3D model using a
More informationCritical Borehole Orientations Rock Mechanics Aspects
Critical Borehole Orientations Rock Mechanics Aspects By R. BRAUN* Abstract This article discusses rock mechanics aspects of the relationship between borehole stability and borehole orientation. Two kinds
More informationWellbore stability analysis in porous carbonate rocks using cap models
Wellbore stability analysis in porous carbonate rocks using cap models L. C. Coelho 1, A. C. Soares 2, N. F. F. Ebecken 1, J. L. D. Alves 1 & L. Landau 1 1 COPPE/Federal University of Rio de Janeiro, Brazil
More informationStresses Analysis of Petroleum Pipe Finite Element under Internal Pressure
ISSN : 48-96, Vol. 6, Issue 8, ( Part -4 August 06, pp.3-38 RESEARCH ARTICLE Stresses Analysis of Petroleum Pipe Finite Element under Internal Pressure Dr.Ragbe.M.Abdusslam Eng. Khaled.S.Bagar ABSTRACT
More informationFinite element modelling of fault stress triggering due to hydraulic fracturing
Finite element modelling of fault stress triggering due to hydraulic fracturing Arsalan, Sattari and David, Eaton University of Calgary, Geoscience Department Summary In this study we aim to model fault
More informationEffect of the intermediate principal stress on fault strike and dip - theoretical analysis and experimental verification
Effect of the intermediate principal stress on fault strike and dip - theoretical analysis and experimental verification B. Haimson University of Wisconsin, USA J. Rudnicki Northwestern University, USA
More informationEnabling Technologies
Enabling Technologies Mechanical Modelling 1 Key Parameter Mineral System Exploration is reflected in scale-dependent translation A. Gradient in hydraulic potential B. Permeability C. Solubility sensitivity
More informationA circular tunnel in a Mohr-Coulomb medium with an overlying fault
MAP3D VERIFICATION EXAMPLE 9 A circular tunnel in a Mohr-Coulomb medium with an overlying fault 1 Description This example involves calculating the stresses and displacements on a fault overlying a 5 m
More informationProduction-induced stress change in and above a reservoir pierced by two salt domes: A geomechanical model and its applications
Production-induced stress change in and above a reservoir pierced by two salt domes: A geomechanical model and its applications Peter Schutjens, Jeroen Snippe, Hassan Mahani, Jane Turner, Joel Ita and
More informationTectonics. Lecture 12 Earthquake Faulting GNH7/GG09/GEOL4002 EARTHQUAKE SEISMOLOGY AND EARTHQUAKE HAZARD
Tectonics Lecture 12 Earthquake Faulting Plane strain 3 Strain occurs only in a plane. In the third direction strain is zero. 1 ε 2 = 0 3 2 Assumption of plane strain for faulting e.g., reverse fault:
More informationExample-3. Title. Description. Cylindrical Hole in an Infinite Mohr-Coulomb Medium
Example-3 Title Cylindrical Hole in an Infinite Mohr-Coulomb Medium Description The problem concerns the determination of stresses and displacements for the case of a cylindrical hole in an infinite elasto-plastic
More informationEMEA. Liudmila Feoktistova Engineer Atomenergoproekt
EMEA Liudmila Feoktistova Engineer Atomenergoproekt Dr. Adolf Birbraer, Atomenergoproekt Dr. Alexandr Roleder, Atomenergoproekt Dmitry Mikhaluk, St. Petersburg State Polytechnical University Finite element
More information3D ANALYSIS OF STRESSES AROUND AN UNLINED TUNNEL IN ROCK SUBJECTED TO HIGH HORIZONTAL STRESSES
3D ANALYSIS OF STRESSES AROUND AN UNLINED TUNNEL IN ROCK SUBJECTED TO HIGH HORIZONTAL STRESSES Abdel Meguid, M. Graduate Student, Department of Civil Engineering, University of Western Ontario, London,
More informationLandslide FE Stability Analysis
Landslide FE Stability Analysis L. Kellezi Dept. of Geotechnical Engineering, GEO-Danish Geotechnical Institute, Denmark S. Allkja Altea & Geostudio 2000, Albania P. B. Hansen Dept. of Geotechnical Engineering,
More informationSeismic analysis of horseshoe tunnels under dynamic loads due to earthquakes
University of Wollongong Research Online Coal Operators' Conference Faculty of Engineering and Information Sciences 2010 Seismic analysis of horseshoe tunnels under dynamic loads due to earthquakes Navid
More informationReservoir Geomechanics and Faults
Reservoir Geomechanics and Faults Dr David McNamara National University of Ireland, Galway david.d.mcnamara@nuigalway.ie @mcnamadd What is a Geological Structure? Geological structures include fractures
More informationMathematical Modelling of a Fault Slip Induced by Water Injection
Mathematical Modelling of a Fault Slip Induced by Water Injection T. S. Nguyen, 1 J.Rutqvist 2 and Y. Gugliemi 2 1 Canadian Nuclear Safety Commission 2 Lawrence Berkeley National Laboratory ComGeo IV Symposium
More informationMain Means of Rock Stress Measurement
Real Stress Distributions through Sedimentary Strata and Implications for Reservoir Development and Potential Gas and Coal Development Strategies Ian Gray Sigra Pty Ltd 93 Colebard St West, Acacia Ridge,
More informationGeomechanical controls on fault and fracture distribution with application to structural permeability and hydraulic stimulation
CSPG Luncheon Calgary February 5 th 2015 Geomechanical controls on fault and fracture distribution with application to structural permeability and hydraulic stimulation Scott Mildren - Ikon Science Australian
More informationThe Effect of Stress Arching on the Permeability Sensitive Experiment in the Su Lige Gas Field
The Effect of Stress Arching on the Permeability Sensitive Experiment in the Su Lige Gas Field Fanliao Wang, Xiangfang Li, Gary Couples, Mingchuan Wang, Yiqun Zhang and Jingjing Zhao THE EFFECT OF STRESS
More informationIN-SITU STRESS ESTIMATION IN OFFSHORE EASTERN MEDITERRANEAN WITH FINITE ELEMENT ANALYSIS
8 th GRACM International Congress on Computational Mechanics Volos, 12 July 15 July 2015 IN-SITU STRESS ESTIMATION IN OFFSHORE EASTERN MEDITERRANEAN WITH FINITE ELEMENT ANALYSIS Anna Kyriacou 1, Panos
More informationStress and Wear Analysis of the Disc Cutter of Rock Tunnel Boring Machine
Send Orders for Reprints to reprints@benthamscience.ae The Open Mechanical Engineering Journal, 2015, 9, 721-725 721 Open Access Stress and Wear Analysis of the Disc Cutter of Rock Tunnel Boring Machine
More informationGeology 229 Engineering Geology. Lecture 5. Engineering Properties of Rocks (West, Ch. 6)
Geology 229 Engineering Geology Lecture 5 Engineering Properties of Rocks (West, Ch. 6) Common mechanic properties: Density; Elastic properties: - elastic modulii Outline of this Lecture 1. Uniaxial rock
More informationNONLINEAR ANALYSIS OF A DAM-RESERVOIR-FOUNDATION SYSTEM UNDER SPATIALLY VARIABLE SEISMIC EXCITATIONS
October 12-17, 28, Beijing, China NONLINEAR ANALYSIS OF A DAM-RESERVOIR-FOUNDATION SYSTEM UNDER SPATIALLY VARIABLE SEISMIC EXCITATIONS J. Huang 1 and A. Zerva 2 1 Dept. of Civil, Architectural and Environmental
More informationDYNAMIC ANALYSIS OF PILES IN SAND BASED ON SOIL-PILE INTERACTION
October 1-17,, Beijing, China DYNAMIC ANALYSIS OF PILES IN SAND BASED ON SOIL-PILE INTERACTION Mohammad M. Ahmadi 1 and Mahdi Ehsani 1 Assistant Professor, Dept. of Civil Engineering, Geotechnical Group,
More informationNumerical Modeling of Interface Between Soil and Pile to Account for Loss of Contact during Seismic Excitation
Numerical Modeling of Interface Between Soil and Pile to Account for Loss of Contact during Seismic Excitation P. Sushma Ph D Scholar, Earthquake Engineering Research Center, IIIT Hyderabad, Gachbowli,
More informationSeismic stability safety evaluation of gravity dam with shear strength reduction method
Water Science and Engineering, 2009, 2(2): 52-60 doi:10.3882/j.issn.1674-2370.2009.02.006 http://kkb.hhu.edu.cn e-mail: wse@hhu.edu.cn Seismic stability safety evaluation of gravity dam with shear strength
More informationInfluences of material dilatancy and pore water pressure on stability factor of shallow tunnels
Influences of material dilatancy and pore water pressure on stability factor of shallow tunnels YANG Xiao-li( ), HUANG Fu( ) School of Civil and Architectural Engineering, Central South University, Changsha
More information25th International Conference on Ground Control in Mining
ANALYTICAL INVESTIGATION OF SHAFT DAMAGES AT WEST ELK MINE Tim Ross, Senior Associate Agapito Associates, Inc. Golden, CO, USA Bo Yu, Senior Engineer Agapito Associates, Inc. Grand Junction, CO, USA Chris
More informationA Constitutive Framework for the Numerical Analysis of Organic Soils and Directionally Dependent Materials
Dublin, October 2010 A Constitutive Framework for the Numerical Analysis of Organic Soils and Directionally Dependent Materials FracMan Technology Group Dr Mark Cottrell Presentation Outline Some Physical
More informationCalculation of Surrounding Rock Pressure Based on Pressure Arch Theory. Yuxiang SONG1,2, a
5th International Conference on Advanced Materials and Computer Science (ICAMCS 2016) Calculation of Surrounding Rock Pressure Based on Pressure Arch Theory Yuxiang SONG1,2, a 1 School of Civil Engineering,
More informationNumerical Approach to Predict the Strength of St. Peter Sandstone Pillars acted upon by Vertical Loads A case study at Clayton, IA, USA.
IOSR Journal of Engineering (IOSRJEN) ISSN (e): 2250-3021, ISSN (p): 2278-8719 Vol. 05, Issue 01 (January. 2015), V2 PP 36-41 www.iosrjen.org Numerical Approach to Predict the Strength of St. Peter Sandstone
More informationStability analysis of a borehole wall during horizontal directional drilling
Tunnelling and Underground Space Technology 22 (2007) 620 632 Tunnelling and Underground Space Technology incorporating Trenchless Technology Research www.elsevier.com/locate/tust Stability analysis of
More informationDeformation of Rocks. Orientation of Deformed Rocks
Deformation of Rocks Folds and faults are geologic structures caused by deformation. Structural geology is the study of the deformation of rocks and its effects. Fig. 7.1 Orientation of Deformed Rocks
More informationEstimation of the Passive Earth Pressure with Inclined Cohesive Backfills: the Effect of Intermediate Principal Stress is Considered
108 The Open Mechanical Engineering Journal, 011, 5, 108-116 Open Access Estimation of the Passive Earth Pressure with Inclined Cohesive Backfills: the Effect of Intermediate Principal Stress is Considered
More information1 Introduction. 1.1 Aims. 1.2 Rock fractures
1 Introduction 1.1 Aims Rock fractures occur in a variety of geological processes and range in size from plate boundaries at the scale of hundreds of kilometres to microcracks in crystals at the scale
More informationFINITE ELEMNT ANALYSIS FOR EVALUATION OF SLOPE STABILITY INDUCED BY CUTTING
FINITE ELEMNT ANALYSIS FOR EVALUATION OF SLOPE STABILITY INDUCED BY CUTTING Toshinori SAKAI Department of Environmental Science and Technology, Mie University, Tsu, Japan Tadatsugu TANAKA Graduate School
More informationTu D Understanding the Interplay of Fractures, Stresses & Facies in Unconventional Reservoirs - Case Study from Chad Granites
Tu D201 04 Understanding the Interplay of Fractures, Stresses & Facies in Unconventional Reservoirs - Case Study from Chad Granites D. Lirong (Chinese National Petroleum Company Ltd. (Chad)), C. Shrivastava*
More informationSOIL MODELS: SAFETY FACTORS AND SETTLEMENTS
PERIODICA POLYTECHNICA SER. CIV. ENG. VOL. 48, NO. 1 2, PP. 53 63 (2004) SOIL MODELS: SAFETY FACTORS AND SETTLEMENTS Gabriella VARGA and Zoltán CZAP Geotechnical Department Budapest University of Technology
More informationMechanical Behaviors of Cylindrical Retaining Structures in Ultra-deep Excavation
Mechanical Behaviors of Cylindrical Retaining Structures in Ultra-deep Excavation Pengfei Xu Tongji University August 4, 2015 Outline Introduction Two circular excavations for anchorage foundations 3D
More informationEffect of buttress on reduction of rock slope sliding along geological boundary
Paper No. 20 ISMS 2016 Effect of buttress on reduction of rock slope sliding along geological boundary Ryota MORIYA *, Daisuke FUKUDA, Jun-ichi KODAMA, Yoshiaki FUJII Faculty of Engineering, Hokkaido University,
More informationLimit analysis of brick masonry shear walls with openings under later loads by rigid block modeling
Limit analysis of brick masonry shear walls with openings under later loads by rigid block modeling F. Portioli, L. Cascini, R. Landolfo University of Naples Federico II, Italy P. Foraboschi IUAV University,
More informationMaterial is perfectly elastic until it undergoes brittle fracture when applied stress reaches σ f
Material is perfectly elastic until it undergoes brittle fracture when applied stress reaches σ f Material undergoes plastic deformation when stress exceeds yield stress σ 0 Permanent strain results from
More informationMEMORANDUM SUBJECT: CERTIFICATE IN ROCK MECHANICS PAPER 1 : THEORY SUBJECT CODE: COMRMC MODERATOR: H YILMAZ EXAMINATION DATE: OCTOBER 2017 TIME:
MEMORANDUM SUBJECT: CERTIFICATE IN ROCK MECHANICS PAPER 1 : THEORY EXAMINER: WM BESTER SUBJECT CODE: COMRMC EXAMINATION DATE: OCTOBER 2017 TIME: MODERATOR: H YILMAZ TOTAL MARKS: [100] PASS MARK: (60%)
More informationNumerical Analysis of the Influence of Seepage on the Displacement Law of Different Overburden Strata
2nd International Forum on lectrical ngineering and Automation (IFA 2015) Numerical Analysis of the Influence of Seepage on the Displacement Law of Different Overburden Strata WANG Yun-ping1, a, ZHAO De-shen2,
More informationPHYSICAL AND MECHANICAL PARAMETERS OF BOREHOLE HYDRAULIC MINING OF NONG AN OIL SHALE
Oil Shale, 2012, Vol. 29, No. 3, pp. 237 247 ISSN 0208-189X doi: 10.3176/oil.2012.3.04 2012 Estonian Academy Publishers PHYSICAL AND MECHANICAL PARAMETERS OF BOREHOLE HYDRAULIC MINING OF NONG AN OIL SHALE
More informationA fresh look at Wellbore Stability Analysis to Sustainable Development of Natural Resources: Issues and Opportunities
A fresh look at Wellbore Stability Analysis to Sustainable Development of Natural Resources: Issues and Opportunities Dr.Parag Diwan, Dr.B.P.Pandey, Dharmendra Kumar Gupta*, Suresh Ayyappan Department
More informationRole of lithological layering on spatial variation of natural and induced fractures in hydraulic fracture stimulation
Role of lithological layering on spatial variation of natural and induced fractures in hydraulic fracture stimulation Vincent Roche *, Department of Physics, University of Alberta, Edmonton roche@ualberta.ca
More informationMining-Caused Activation of Fault
Discrete Dynamics in Nature and Society, 2002 VoL. 7 (3), pp. 151-155 Taylor & Francis Taylor & Francis Group Numerical Simulation of Fractal Interface Effect of Mining-Caused Activation of Fault YU GUANGMINGa
More information1. classic definition = study of deformed rocks in the upper crust
Structural Geology I. Introduction 1. classic definition = study of deformed rocks in the upper crust deformed includes translation, rotation, and strain (change of shape) All rocks are deformed in some
More informationTemperature Dependent Mechanical Properties of Reservoir s Overburden Rocks During SAGD Process
Temperature Dependent Mechanical Properties of Reservoir s Overburden Rocks During SAGD Process Bo Zhao 1, Shangqi Liu 2, Bo Huang 3, and Yang Liu 4 and Guangqing Zhang *,5 1,5 China University of Petroleum
More informationSTUDY OF DYNAMIC SOIL-STRUCTURE INTERACTION OF CONCRETE GRAVITY DAMS
STUDY OF DYNAMIC SOIL-STRUCTURE INTERACTION OF CONCRETE GRAVITY DAMS Djamel OUZANDJA 1, Fatiha BENKECHIDA 2, Toufiq OUZANDJA 3, Hamza BELHADED 4 ABSTRACT The safety evaluation of the dams subjected to
More informationAuthor(s) Okajima, Kenji; Tanaka, Tadatsugu; Symposium on Backwards Problem in G.
Title Backwards Analysis for Retaining Wa based upon ateral Wall Displacemen Author(s) Okajima, Kenji; Tanaka, Tadatsugu; Proceeding of TC302 Symposium Osaka Citation Symposium on Backwards Problem in
More informationTowards Efficient Finite Element Model Review Dr. Richard Witasse, Plaxis bv (based on the original presentation of Dr.
Towards Efficient Finite Element Model Review Dr. Richard Witasse, Plaxis bv (based on the original presentation of Dr. Brinkgreve) Journée Technique du CFMS, 16 Mars 2011, Paris 1/32 Topics FEA in geotechnical
More informationNUMERICAL ANALYSIS OF A PILE SUBJECTED TO LATERAL LOADS
IGC 009, Guntur, INDIA NUMERICAL ANALYSIS OF A PILE SUBJECTED TO LATERAL LOADS Mohammed Younus Ahmed Graduate Student, Earthquake Engineering Research Center, IIIT Hyderabad, Gachibowli, Hyderabad 3, India.
More informationAvailable online at ScienceDirect. Procedia Engineering 84 (2014 )
Available online at www.sciencedirect.com ScienceDirect Procedia Engineering 84 (2014 ) 898 905 2014ISSST, 2014 International Symposium on Safety Science and Technology Study on dynamic numerical simulation
More informationFurther Research into Methods of Analysing the October 2000 Stability of Deep Open Pit Mines EXECUTIVE SUMMARY
EXECUTIVE SUMMARY This report presents the results of a program of further research into the use of a combined approach of numerical and centrifuge modeling in assessing the stability of deep open pit
More informationGEO E1050 Finite Element Method Mohr-Coulomb and other constitutive models. Wojciech Sołowski
GEO E050 Finite Element Method Mohr-Coulomb and other constitutive models Wojciech Sołowski To learn today. Reminder elasticity 2. Elastic perfectly plastic theory: concept 3. Specific elastic-perfectly
More informationFinite difference modelling in underground coal mine roadway
University of Wollongong Research Online Coal Operators' Conference Faculty of Engineering and Information Sciences 2017 Finite difference modelling in underground coal mine roadway Ali Akbar Sahebi University
More informationThe experimental study on displacement pressure in fractured reservoir of Mudstone
IOSR Journal of Engineering (IOSRJEN) ISSN (e): 225-321, ISSN (p): 2278-8719 Vol. 6, Issue 2 (February. 216), V1 PP 1-5 www.iosrjen.org Wei Huabin 1, Gan Ning 2, Zhu Huanlai 1, Li Jingying 1, Zhai Zhiwei
More informationWeak Rock - Controlling Ground Deformations
EOSC 547: Tunnelling & Underground Design Topic 7: Ground Characteristic & Support Reaction Curves 1 of 35 Tunnelling Grad Class (2014) Dr. Erik Eberhardt Weak Rock - Controlling Ground Deformations To
More informationJihoon Kim, George J. Moridis, John Edmiston, Evan S. Um, Ernest Majer. Earth Sciences Division, Lawrence Berkeley National Laboratory 24 Mar.
TOUGH+ROCMECH for the Analysis of coupled Flow, Thermal, Geomechanical and Geophysical Processes Code Description and Applications to Tight/Shale Gas Problems Jihoon Kim, George J. Moridis, John Edmiston,
More informationLocal cracking stability analysis of super high arch dam *Peng Lin 1), Qingbin Li, Dong Zheng, Senying Hu
Local cracking stability analysis of super high arch dam *Peng Lin 1), Qingbin Li, Dong Zheng, Senying Hu State Key Laboratory of Hydroscience and Engineering, TsinghuaUniversity, Beijing 100084, China
More informationABSTRACT INTRODUCTION
Optimization of soil anchorages M. Teschner, C. Mattheck Kernforschungszentrum Karlsruhe GmbH, Institut fur Materialforschung II, W-7500 Karlsruhe 1, Postfach 3640, Germany ABSTRACT A new optimization
More informationRock mechanics as a significant supplement for cross-section balancing (an example from the Pavlov Hills, Outer Western Carpathians, Czech Republic)
Trabajos de Geología, Universidad de Oviedo, 30 : 140-144 (2010) Rock mechanics as a significant supplement for cross-section balancing (an example from the Pavlov Hills, Outer Western Carpathians, Czech
More informationAnswers: Internal Processes and Structures (Isostasy)
Answers: Internal Processes and Structures (Isostasy) 1. Analyse the adjustment of the crust to changes in loads associated with volcanism, mountain building, erosion, and glaciation by using the concept
More informationReservoir Geomechanics with ABAQUS
Reservoir Geomechanics with ABAQUS B. Bostrøm and E. Skomedal Statoil ASA, Norway Abstract: The coupled hydro-mechanical behavior of two North Sea high-pressure/hightemperature gas-condensate fields during
More informationSPE DISTINGUISHED LECTURER SERIES is funded principally through a grant of the SPE FOUNDATION
SPE DISTINGUISHED LECTURER SERIES is funded principally through a grant of the SPE FOUNDATION The Society gratefully acknowledges those companies that support the program by allowing their professionals
More informationIntroduction and Background
Introduction and Background Itasca Consulting Group, Inc. (Itasca) has been participating in the geomechanical design of the underground 118-Zone at the Capstone Minto Mine (Minto) in the Yukon, in northwestern
More informationEQUIVALENT FRACTURE ENERGY CONCEPT FOR DYNAMIC RESPONSE ANALYSIS OF PROTOTYPE RC GIRDERS
EQUIVALENT FRACTURE ENERGY CONCEPT FOR DYNAMIC RESPONSE ANALYSIS OF PROTOTYPE RC GIRDERS Abdul Qadir Bhatti 1, Norimitsu Kishi 2 and Khaliq U Rehman Shad 3 1 Assistant Professor, Dept. of Structural Engineering,
More informationISMS Paper No Influence of weak planes on rockburst occurrence. Amin Manouchehrian, Ming Cai *
Paper No. 176 ISMS 2016 Influence of weak planes on rockburst occurrence Amin Manouchehrian, Ming Cai * Bharti School of Engineering, Laurentian University, Sudbury, Canada, P3E 2C6 MIRARCO, Laurentian
More informationModelling the behaviour of plastics for design under impact
Modelling the behaviour of plastics for design under impact G. Dean and L. Crocker MPP IAG Meeting 6 October 24 Land Rover door trim Loading stages and selected regions Project MPP7.9 Main tasks Tests
More informationHYDRAULIC FRACTURE PROPAGATION NEAR A NATURAL DISCONTINUITY
PROCEEDINGS, Twenty-Eight Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, January 7-9, SGP-TR-7 HYDRAULIC FRACTURE PROPAGATION NEAR A NATURAL DISCONTINUITY V. Koshelev
More informationMulti-scale fracture prediction using P-wave data: a case study
Multi-scale fracture prediction using P-wave data: a case study Wanlu Zhang 1,2,*, Shuangquan Chen 1,2, Jian Wang 3, Lianbo Zeng 1, Xiang-Yang Li 1,2,4, 1. State Key Laboratory of Petroleum Resources and
More informationThe Mechanical Model and the Mechanism of Rock Breaking of Ridge Cutter
International Core Journal of Engineering Vol.3 No.7 07 ISSN: 44-895 The Mechanical Model and the Mechanism of Rock Breaking of Ridge Cutter Chengsen Yan, Min Lin and Zongliang Xie Southwest Petroleum
More informationMaterials and Methods The deformation within the process zone of a propagating fault can be modeled using an elastic approximation.
Materials and Methods The deformation within the process zone of a propagating fault can be modeled using an elastic approximation. In the process zone, stress amplitudes are poorly determined and much
More informationEnhancing Prediction Accuracy In Sift Theory
18 TH INTERNATIONAL CONFERENCE ON COMPOSITE MATERIALS Enhancing Prediction Accuracy In Sift Theory J. Wang 1 *, W. K. Chiu 1 Defence Science and Technology Organisation, Fishermans Bend, Australia, Department
More informationSurface changes caused by erosion and sedimentation were treated by solving: (2)
GSA DATA REPOSITORY 214279 GUY SIMPSON Model with dynamic faulting and surface processes The model used for the simulations reported in Figures 1-3 of the main text is based on two dimensional (plane strain)
More informationDEFORMATION OF SANDY DEPOSITS BY FAULT MOVEMENT
09 DEFORMATION OF SANDY DEPOSITS BY FAULT MOVEMENT H TANIYAMA And H WATANABE SUMMARY We performed sandbox tests and numerical analysis of the tests to investigate the deformation and shear failure of the
More informationEffect of embedment depth and stress anisotropy on expansion and contraction of cylindrical cavities
Effect of embedment depth and stress anisotropy on expansion and contraction of cylindrical cavities Hany El Naggar, Ph.D., P. Eng. and M. Hesham El Naggar, Ph.D., P. Eng. Department of Civil Engineering
More informationINFLUENCE OF SHALLOW MINE-WORKINGS ON CRACK FAILURE OF OVERBURDEN STRATA. 1. Introduction. 2. General situation. Yu Xueyi*, Huang Senlin*
Górnictwo i Geoinżynieria Rok 9 Zeszyt 3/ 005 Yu Xueyi*, Huang Senlin* INFLUENCE OF SHALLOW INE-WORKINGS ON CRACK FAILURE OF OVERBURDEN STRATA. Introduction The exploitation of Shendong coalfield causes
More informationNUMERICAL VERIFICATION OF GEOTECHNICAL STRUCTURE IN UNFAVOURABLE GEOLOGICAL CONDITIONS CASE STUDY
NUMERICAL VERIFICATION OF GEOTECHNICAL STRUCTURE IN UNFAVOURABLE GEOLOGICAL CONDITIONS CASE STUDY Abstract Marián DRUSA Department of Geotechnics, Faculty of Civil Engineering, Univerzity of Žilina, Univerzitná
More informationSimulation of the cutting action of a single PDC cutter using DEM
Petroleum and Mineral Resources 143 Simulation of the cutting action of a single PDC cutter using DEM B. Joodi, M. Sarmadivaleh, V. Rasouli & A. Nabipour Department of Petroleum Engineering, Curtin University,
More informationEngineering Geophysical Application to Mine Subsidence Risk Assessment
Engineering Geophysical Application to Mine Subsidence Risk Assessment By: Kanaan Hanna, Sr. Mining Engineer Steve Hodges, Sr. Geophysicist Jim Pfeiffer, Sr. Geophysicist Dr. Keith Heasley, Professor West
More informationGeomechanics for reservoir and beyond Examples of faults impact on fluid migration. Laurent Langhi Team Leader August 2014
Geomechanics for reservoir and beyond Examples of faults impact on fluid migration Laurent Langhi Team Leader August 2014 Reservoir Geomechanics It is critical to understand the mechanical behaviour of
More informationClassical fracture and failure hypotheses
: Chapter 2 Classical fracture and failure hypotheses In this chapter, a brief outline on classical fracture and failure hypotheses for materials under static loading will be given. The word classical
More informationModule 9 : Foundation on rocks. Content
FOUNDATION ON ROCKS Content 9.1 INTRODUCTION 9.2 FOUNDATION TYPES ON ROCKS 9.3 BEARING CAPCITY- SHALLOW FOUNDATION 9.3.1 Ultimate bearing capacity 9.3.2 Safe bearing pressure 9.3.3 Estimation of bearing
More informationNumerical Analysis on the Interaction between Two Zipper Frac Wells with Continuum Damage Model
Copyright 2013 Tech Science Press SL, vol.9, no.1, pp.1-22, 2013 Numerical Analysis on the Interaction between Two Zipper Frac Wells with Continuum Damage Model Xinpu Shen 1 Abstract: Zipper fracturing
More informationThe Mohr Stress Diagram. Edvard Munch as a young geologist!
The Mohr Stress Diagram Edvard Munch as a young geologist! Material in the chapter is covered in Chapter 7 in Fossen s text The Mohr Stress Diagram A means by which two stresses acting on a plane of known
More informationFinite-Element Analysis of Stress Concentration in ASTM D 638 Tension Specimens
Monika G. Garrell, 1 Albert J. Shih, 2 Edgar Lara-Curzio, 3 and Ronald O. Scattergood 4 Journal of Testing and Evaluation, Vol. 31, No. 1 Paper ID JTE11402_311 Available online at: www.astm.org Finite-Element
More informationChapter 4 STRESSES AROUND BOREHOLE:BOREHOLE INSTABILITY CRITERIA
Chapter 4 STRESSES AROUND BOREHOLE:BOREHOLE INSTABILITY CRITERIA 4.1 NEAR WELLBORE STRESS- STATE Before drilling, rock stress is described by the in-situ stresses and effective stresses. As the hole is
More informationStudy of Pile Interval of Landslide Restraint Piles by Centrifuge Test and FEM Analysis
Disaster Mitigation of Debris Flows, Slope Failures and Landslides 113 Study of Pile Interval of Landslide Restraint Piles by Centrifuge Test and FEM Analysis Yasuo Ishii, 1) Hisashi Tanaka, 1) Kazunori
More informationNumerical Analysis of Delamination Behavior in Laminated Composite with Double Delaminations Embedded in Different Depth Positions
Numerical Analysis of Delamination Behavior in Laminated Composite with Double Delaminations Embedded in Different Depth Positions Numerical Analysis of Delamination Behavior in Laminated Composite with
More information