- Development of Fracture Networks Through Hydraulic Fracture Growth in Naturally Fractured Reservoirs
- X. Zhang ; R. Jeffrey
- Book Title / Journal: Effective and Sustainable Hydraulic Fracturing - Chapter 7
- Year: 2013
- Discrete Element ; Mining
- Keywords: hydraulic fracturing ; Finite Element Method ; Discrete Element Method ; fractured reservoirs
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- The Impact of the Near-Tip Logic on the Accuracy and Convergence Rate of Hydraulic Fracture Simulators Compared to Reference Solutions
- B. Lecampion ; A. Peirce ; E. Detournay ; X. Zhang ; Z. Chen ; An. Bunger ; C. DetournayC ; J. Napier ; S. Abbas ; D. Garagash ; P. Cundall
- Book Title / Journal: Effective and Sustainable Hydraulic Fracturing
- Year: 2013 , Series: Chapter 43
- Numerical & Constitutive Modeling
- Keywords: hydraulic fracture simulators ; near-tip logic
- Description
- We benchmark a series of simulators against available reference solutions for propagating
plane-strain and radial hydraulic fractures. In particular, we focus on the accuracy and
convergence of the numerical solutions in the important practical case of viscosity dominated
propagation. The simulators are based on different propagation criteria: linear elastic
fracture mechanics (LEFM), cohesive zone models/tensile strength criteria, and algorithms
accounting for the multi-scale nature of hydraulic fracture propagation in the near-tip region.
All the simulators tested here are able to capture the analytical solutions of the different configurations tested, but at vastly different computational costs. Algorithms based on
the classical LEFM propagation condition require a fine mesh in order to capture viscosity dominated hydraulic fracture evolution. Cohesive zone models, which model the fracture
process zone, require even finer meshes to obtain the same accuracy. By contrast, when
the algorithms use the appropriate multi-scale hydraulic fracture asymptote in the near-tip
region, the exact solution can be matched accurately with a very coarse mesh. The different
analytical reference solutions used in this paper provide a crucial series of benchmark tests
that any successful hydraulic fracturing simulator should pass.
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- An Efficient and Accurate Approach for Studying the Heat Extraction from Multiple Recharge and Discharge Wells
- B. Wu ; X. Zhang ; A. Bunger ; R. Jeffrey
- Book Title / Journal: Effective and Sustainable Hydraulic Fracturing
- Year: 2013 , Series: Chapter 47
- Numerical & Constitutive Modeling
- Keywords: multi-well reservoir system ; engineered geothermal system ; heat convection
- Description
- In order to understand the thermal recovery Behavior of an engineered geothermal system
(EGS), this paper develops a model in which fluid circulates in a single, planar hydraulic fracture with a constant hydraulic aperture via multiple recharging and discharging wells.
The coupled equations for heat convection in the fracture plane and heat transfer into the rock are provided for steady and irrotational fluid flow conditions. By using velocity potentials and streamline functions, the temperature along a streamline is found to be only a function of the potential. By utilizing the Laplace transformation, the analytical solutions in the Laplace space for the temperature field are found, which are numerically inverted for timedomain results. Several examples with different arrangements of injection and production wells are investigated and the comparison with other published results is provided. The semi-analytical results demonstrate that the proposed model provides an efficient and accurate approach for predicting the temperatures of a multi-well reservoir system.
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- Hydro-mechanical properties of lime-treated London Clay
- M.J. Gunn ; Z. Kichou ; X. Zhang ; M. Mavroulidou
- Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, September 2-6 2013
- Year: 2013
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- Preliminary Study of Ground Motion Characteristics in Furukawa District, Japan, based on Very Dense Seismic-array-observation
- H. Goto ; H. Morikawa ; Y. Ogura ; S. Tokue ; X. Zhang ; M. Iwasaki ; M. Arai ; S. Sawada ; M. Inatani
- International Symposium on Engineering Lessons Learned from the Giant Earthquake, Kenchiku-kaikan, Japan, 1-4 March 2012.
- Year: 2012
- Soil Dynamics ; Geotechnical Earthquake Engineering
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- Effect of soil stratification on pipe behaviour due to tunnelling-induced ground movements based on the displacement controlled method
- Z.G. Zhang ; M.S. Huang ; M.X. Zhang ; W.D. Wang
- IS ROME '11
- Year: 2011
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- Prediction of surface settlements induced by shield tunneling: An ANFIS model
- M. Tu ; M.X. Zhang ; J. Hou
- Geotechnical Aspects of Underground Construction in Soft Ground – Proceedings of the 6th International Symposium (IS-SHANGHAI 2008)
Shanghai - China
April 10-12, 2008
- Year: 2008
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- Stability analysis of large slurry shield-driven tunnel in soft clay
- R. Kastner ; F. Emeriault ; Z.X. Zhang ; Y. Li
- Geotechnical Aspects of Underground Construction in Soft Ground – Proceedings of the 6th International Symposium (IS-SHANGHAI 2008)
Shanghai - China
April 10-12, 2008
- Year: 2008
- Tunneling ; Tunneling in Soils ; Numerical & Constitutive Modeling
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- Deformation and pore pressure model of the saturated silty clay around a subway tunnel
- X. Zhang ; Y.Q. Tang ; Z.D. Cui
- Geotechnical Aspects of Underground Construction in Soft Ground – Proceedings of the 6th International Symposium (IS-SHANGHAI 2008)
Shanghai - China
April 10-12, 2008
- Year: 2008
- Tunneling in Soils ; Laboratory Testing ; Soil Dynamics
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- Dynamic response of saturated silty clay around a tunnel under subway vibration loading in Shanghai
- X. Zhang ; Z.D. Cui ; Y.Q. Tang
- Geotechnical Aspects of Underground Construction in Soft Ground – Proceedings of the 6th International Symposium (IS-SHANGHAI 2008)
Shanghai - China
April 10-12, 2008
- Year: 2008
- Soil Dynamics ; Instrumentation ; Tunneling
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- Effect of soil stratification on pipe behaviour due to tunnelling-induced ground movements based on the displacement controlled method
- Z.G. Zhang ; M.S. Huang ; M.X. Zhang ; W.D. Wang
- Underground Construction in Soft Ground Symposium (TC204) - IS ROME '11
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- Tunneling ; Numerical & Constitutive Modeling
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- Hydro-mechanical properties of lime-treated London Clay
- M. Mavroulidou ; X. Zhang ; Z. Kichou ; M.J. Gunn
- International Conference on Soil Mechanics and Geotechnical Engineering - 18th International Conference on Soil Mechanics and Geotechnical Engineering (Paris)
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- Lime Stabilization ; Laboratory Testing
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- Analysis of PLT and CPT by oedo-triaxial model
- G.X. Zhang ; N.R. Zhang ; F.L. Zhang
- International Conference on Soil Mechanics and Geotechnical Engineering - 12th International Conference on Soil Mechanics and Foundation Engineering (Rio De Janeiro)
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- Deformation and suction variation of an unsaturated soil during constant water content triaxial loading
- L. Li ; X. Zhang
- TC106 Conferences in Unsaturated Soils - 7th International Conference on Unsaturated Soils 2018 (Hong Kong)
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- Soil Mechanics ; Laboratory Testing
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- Wicking fabric interactions with different soil types
- C. Lin ; X. Zhang
- TC106 Conferences in Unsaturated Soils - 7th International Conference on Unsaturated Soils 2018 (Hong Kong)
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