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B Wang - One of the best experts on this subject based on the ideXlab platform.
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simulation of two phase flow in horizontal Fracture networks with numerical manifold method
Advances in Water Resources, 2017Co-Authors: L F Fan, H D Wang, B WangAbstract:Abstract The paper presents simulation of two-phase flow in discrete Fracture networks with numerical manifold method (NMM). Each phase of fluids is considered to be confined within the assumed discrete interfaces in the present method. The homogeneous model is modified to approach the mixed fluids. A new mathematical cover formation for Fracture intersection is proposed to satisfy the mass conservation. NMM simulations of two-phase flow in a single Fracture, intersection, and Fracture network are illustrated graphically and validated by the analytical method or the finite element method. Results show that the motion status of discrete interface significantly depends on the ratio of mobility of two fluids rather than the value of the mobility. The variation of fluid velocity in each Fracture Segment and the driven fluid content are also influenced by the ratio of mobility. The advantages of NMM in the simulation of two-phase flow in a Fracture network are demonstrated in the present study, which can be further developed for practical engineering applications.
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simulation of two phase flow in horizontal Fracture networks with numerical manifold method
Advances in Water Resources, 2017Co-Authors: H D Wang, B WangAbstract:Abstract The paper presents simulation of two-phase flow in discrete Fracture networks with numerical manifold method (NMM). Each phase of fluids is considered to be confined within the assumed discrete interfaces in the present method. The homogeneous model is modified to approach the mixed fluids. A new mathematical cover formation for Fracture intersection is proposed to satisfy the mass conservation. NMM simulations of two-phase flow in a single Fracture, intersection, and Fracture network are illustrated graphically and validated by the analytical method or the finite element method. Results show that the motion status of discrete interface significantly depends on the ratio of mobility of two fluids rather than the value of the mobility. The variation of fluid velocity in each Fracture Segment and the driven fluid content are also influenced by the ratio of mobility. The advantages of NMM in the simulation of two-phase flow in a Fracture network are demonstrated in the present study, which can be further developed for practical engineering applications.
H D Wang - One of the best experts on this subject based on the ideXlab platform.
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simulation of two phase flow in horizontal Fracture networks with numerical manifold method
Advances in Water Resources, 2017Co-Authors: L F Fan, H D Wang, B WangAbstract:Abstract The paper presents simulation of two-phase flow in discrete Fracture networks with numerical manifold method (NMM). Each phase of fluids is considered to be confined within the assumed discrete interfaces in the present method. The homogeneous model is modified to approach the mixed fluids. A new mathematical cover formation for Fracture intersection is proposed to satisfy the mass conservation. NMM simulations of two-phase flow in a single Fracture, intersection, and Fracture network are illustrated graphically and validated by the analytical method or the finite element method. Results show that the motion status of discrete interface significantly depends on the ratio of mobility of two fluids rather than the value of the mobility. The variation of fluid velocity in each Fracture Segment and the driven fluid content are also influenced by the ratio of mobility. The advantages of NMM in the simulation of two-phase flow in a Fracture network are demonstrated in the present study, which can be further developed for practical engineering applications.
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simulation of two phase flow in horizontal Fracture networks with numerical manifold method
Advances in Water Resources, 2017Co-Authors: H D Wang, B WangAbstract:Abstract The paper presents simulation of two-phase flow in discrete Fracture networks with numerical manifold method (NMM). Each phase of fluids is considered to be confined within the assumed discrete interfaces in the present method. The homogeneous model is modified to approach the mixed fluids. A new mathematical cover formation for Fracture intersection is proposed to satisfy the mass conservation. NMM simulations of two-phase flow in a single Fracture, intersection, and Fracture network are illustrated graphically and validated by the analytical method or the finite element method. Results show that the motion status of discrete interface significantly depends on the ratio of mobility of two fluids rather than the value of the mobility. The variation of fluid velocity in each Fracture Segment and the driven fluid content are also influenced by the ratio of mobility. The advantages of NMM in the simulation of two-phase flow in a Fracture network are demonstrated in the present study, which can be further developed for practical engineering applications.
Antonio Pozzi - One of the best experts on this subject based on the ideXlab platform.
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effect of plate working length on plate stiffness and cyclic fatigue life in a cadaveric femoral Fracture gap model stabilized with a 12 hole 2 4 mm locking compression plate
BMC Veterinary Research, 2013Co-Authors: Peini Chao, Marybeth Horodyski, Bryan P Conrad, Daniel D Lewis, Antonio PozziAbstract:Background There are several factors that can affect the fatigue life of a bone plate, including the mechanical properties of the plate and the complexity of the Fracture. The position of the screws can influence construct stiffness, plate strain and cyclic fatigue of the implants. Studies have not investigated these variables in implants utilized for long bone Fracture fixation in dogs and cats. The purpose of the present study was to evaluate the effect of plate working length on construct stiffness, gap motion and resistance to cyclic fatigue of dog femora with a simulated Fracture gap stabilized using a 12-hole 2.4 mm locking compression plates (LCP). Femora were plated with 12-hole 2.4 mm LCP using 2 screws per Fracture Segment (long working length group) or with 12-hole 2.4 mm LCP using 5 screws per Fracture Segment (a short working length group).
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effect of plate working length on plate stiffness and cyclic fatigue life in a cadaveric femoral Fracture gap model stabilized with a 12 hole 2 4 mm locking compression plate
BMC Veterinary Research, 2013Co-Authors: Peini Chao, Marybeth Horodyski, Bryan P Conrad, Daniel Lewis, Antonio PozziAbstract:There are several factors that can affect the fatigue life of a bone plate, including the mechanical properties of the plate and the complexity of the Fracture. The position of the screws can influence construct stiffness, plate strain and cyclic fatigue of the implants. Studies have not investigated these variables in implants utilized for long bone Fracture fixation in dogs and cats. The purpose of the present study was to evaluate the effect of plate working length on construct stiffness, gap motion and resistance to cyclic fatigue of dog femora with a simulated Fracture gap stabilized using a 12-hole 2.4 mm locking compression plates (LCP). Femora were plated with 12-hole 2.4 mm LCP using 2 screws per Fracture Segment (long working length group) or with 12-hole 2.4 mm LCP using 5 screws per Fracture Segment (a short working length group). Construct stiffness did not differ significantly between stabilization techniques. Implant failure did not occur in any of the plated femora during cycling. Mean ± SD yield load at failure in the short plate working length group was significantly higher than in the long plate working length group. In a femoral Fracture gap model stabilized with a 2.4 mm LCP applied in contact with the bone, plate working length had no effect on stiffness, gap motion and resistance to fatigue. The short plate working length constructs failed at higher loads; however, yield loads for both the short and long plate working length constructs were within physiologic range.
Peini Chao - One of the best experts on this subject based on the ideXlab platform.
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effect of plate working length on plate stiffness and cyclic fatigue life in a cadaveric femoral Fracture gap model stabilized with a 12 hole 2 4 mm locking compression plate
BMC Veterinary Research, 2013Co-Authors: Peini Chao, Marybeth Horodyski, Bryan P Conrad, Daniel D Lewis, Antonio PozziAbstract:Background There are several factors that can affect the fatigue life of a bone plate, including the mechanical properties of the plate and the complexity of the Fracture. The position of the screws can influence construct stiffness, plate strain and cyclic fatigue of the implants. Studies have not investigated these variables in implants utilized for long bone Fracture fixation in dogs and cats. The purpose of the present study was to evaluate the effect of plate working length on construct stiffness, gap motion and resistance to cyclic fatigue of dog femora with a simulated Fracture gap stabilized using a 12-hole 2.4 mm locking compression plates (LCP). Femora were plated with 12-hole 2.4 mm LCP using 2 screws per Fracture Segment (long working length group) or with 12-hole 2.4 mm LCP using 5 screws per Fracture Segment (a short working length group).
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effect of plate working length on plate stiffness and cyclic fatigue life in a cadaveric femoral Fracture gap model stabilized with a 12 hole 2 4 mm locking compression plate
BMC Veterinary Research, 2013Co-Authors: Peini Chao, Marybeth Horodyski, Bryan P Conrad, Daniel Lewis, Antonio PozziAbstract:There are several factors that can affect the fatigue life of a bone plate, including the mechanical properties of the plate and the complexity of the Fracture. The position of the screws can influence construct stiffness, plate strain and cyclic fatigue of the implants. Studies have not investigated these variables in implants utilized for long bone Fracture fixation in dogs and cats. The purpose of the present study was to evaluate the effect of plate working length on construct stiffness, gap motion and resistance to cyclic fatigue of dog femora with a simulated Fracture gap stabilized using a 12-hole 2.4 mm locking compression plates (LCP). Femora were plated with 12-hole 2.4 mm LCP using 2 screws per Fracture Segment (long working length group) or with 12-hole 2.4 mm LCP using 5 screws per Fracture Segment (a short working length group). Construct stiffness did not differ significantly between stabilization techniques. Implant failure did not occur in any of the plated femora during cycling. Mean ± SD yield load at failure in the short plate working length group was significantly higher than in the long plate working length group. In a femoral Fracture gap model stabilized with a 2.4 mm LCP applied in contact with the bone, plate working length had no effect on stiffness, gap motion and resistance to fatigue. The short plate working length constructs failed at higher loads; however, yield loads for both the short and long plate working length constructs were within physiologic range.
Jizhou Tang - One of the best experts on this subject based on the ideXlab platform.
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a 3 d model for simulation of weak interface slippage for Fracture height containment in shale reservoirs
International Journal of Solids and Structures, 2018Co-Authors: Jizhou Tang, Kan WuAbstract:Abstract Shale formations often consist of multiple distinct layers with varying rock properties, in-situ stress states, and interface properties between layers. Weak horizontal interfaces often affect Fracture height growth and induced complex Fracture geometry. In this paper, a fully three-dimensional displacement discontinuity method is developed to investigate slippage of weak horizontal interfaces and understand the effects of the slippage on Fracture height growth. Horizontal Fracture Segments are regarded as weak horizontal interfaces and vertical Fractures would either be arrested or step over interfaces. Results indicate that a width jump of the vertical Fracture occurs at the crossing position of the horizontal interface, as a result of shear displacement discontinuities along the horizontal Fracture Segment. The width jump hinders the vertical Fracture growth in the height direction, which is regarded as a new mechanism of Fracture height containment. Shear displacement discontinuities and width jump increase with the increment of the distance between the center of the vertical Fracture and horizontal Fracture Segment. The larger the width jump, the more difficult the vertical Fracture continues to propagate in the height direction, which implies that the vertical Fracture tends to be arrested by the interface when the wellbore is far away from the interface.
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numerical investigation of effect of natural Fractures on hydraulic Fracture propagation in unconventional reservoirs
Journal of Natural Gas Science and Engineering, 2018Co-Authors: Jun Xie, Haoyong Huang, Bo Zeng, Jizhou TangAbstract:Abstract Field observations show that natural Fractures are commonly presented in unconventional reservoirs, acting as planes of weakness that divert hydraulic Fracture propagation and generate complex Fracture geometry. We systematically investigated the impacts of natural Fractures on net injection pressure, Fracture geometry, fluid volume distribution, and induced stresses using a complex Fracture propagation model. The model fully couples rock deformation and fluid flow in the Fractures, perforations, and the wellbore. A simplified three-dimensional displacement discontinuity method is used to calculate multiple Fracture interaction within stages as well as between stages and wells. Fluid volume distribution between each Fracture is automatically calculated during pumping based on fluid resistance. The simulation results show that when a hydraulic Fracture diverts into a natural Fracture, the net injection pressure is elevated, resulting in width enlargement of the Fracture Segment before the natural Fracture and reduction of total Fracture length. Much less fluid flows into the Fracture wing that diverts into the natural Fracture. Due to a larger compressional stress exerting on the natural Fracture, Fracture width of the Fracture Segment on the natural Fracture is restricted, which significantly affects proppant transport and distribution. Additionally, differential stress, approach angle, length of natural Fractures, and relative position of natural Fractures are critical parameters affecting elevation of net injection pressure as well as Fracture width enlargement and restriction before and on natural Fractures. As differential stress and approach angle increase, higher net injection pressure is required, shorter Fracture length is created, and width enlargement and restriction before and on natural Fractures are more severe. Deviation of Fracture propagation from the original path is greatly affected by the length of natural Fractures. The larger the natural Fracture, the more deviation from the original path. This study highlights the behaviors of a hydraulic Fracture diverting into a natural Fracture and the final Fracture geometry.
