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Zhangxin Chen - One of the best experts on this subject based on the ideXlab platform.
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effect of Fracture Pressure depletion regimes on the dual porosity shape factor for flow of compressible fluids in Fractured porous media
Advances in Water Resources, 2011Co-Authors: Ehsan Ranjbar, Hassan Hassanzadeh, Zhangxin ChenAbstract:A precise value of the matrix-Fracture transfer shape factor is essential for modeling fluid flow in Fractured porous media by a dual-porosity approach. The slightly compressible fluid shape factor has been widely investigated in the literature. In a recent study, we have developed a transfer function for flow of a compressible fluid using a constant Fracture Pressure boundary condition [Ranjbar E, Hassanzadeh H, Matrix-Fracture transfer shape factor for modeling flow of a compressible fluid in dual-porosity media. Adv Water Res 2011;34(5):627–39. doi:10.1016/j.advwatres.2011.02.012]. However, for a compressible fluid, the consequence of a Pressure depletion boundary condition on the shape factor has not been investigated in the previous studies. The main purpose of this paper is, therefore, to investigate the effect of the Fracture Pressure depletion regime on the shape factor for single-phase flow of a compressible fluid. In the current study, a model for evaluation of the shape factor is derived using solutions of a nonlinear diffusivity equation subject to different Pressure depletion regimes. A combination of the heat integral method, the method of moments and Duhamel’s theorem is used to solve this nonlinear equation. The developed solution is validated by fine-grid numerical simulations. The presented model can recover the shape factor of slightly compressible fluids reported in the literature. This study demonstrates that in the case of a single-phase flow of compressible fluid, the shape factor is a function of the imposed boundary condition in the Fracture and its variability with time. It is shown that such dependence can be described by an exponentially declining Fracture Pressure with different decline exponents. These findings improve our understanding of fluid flow in Fractured porous media.
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effect of Fracture Pressure depletion regimes on the dual porosity shape factor for flow of compressible fluids in Fractured porous media
Advances in Water Resources, 2011Co-Authors: Ehsan Ranjbar, Hassan Hassanzadeh, Zhangxin ChenAbstract:A precise value of the matrix-Fracture transfer shape factor is essential for modeling fluid flow in Fractured porous media by a dual-porosity approach. The slightly compressible fluid shape factor has been widely investigated in the literature. In a recent study, we have developed a transfer function for flow of a compressible fluid using a constant Fracture Pressure boundary condition [Ranjbar E, Hassanzadeh H, Matrix-Fracture transfer shape factor for modeling flow of a compressible fluid in dual-porosity media. Adv Water Res 2011;34(5):627–39. doi:10.1016/j.advwatres.2011.02.012]. However, for a compressible fluid, the consequence of a Pressure depletion boundary condition on the shape factor has not been investigated in the previous studies. The main purpose of this paper is, therefore, to investigate the effect of the Fracture Pressure depletion regime on the shape factor for single-phase flow of a compressible fluid. In the current study, a model for evaluation of the shape factor is derived using solutions of a nonlinear diffusivity equation subject to different Pressure depletion regimes. A combination of the heat integral method, the method of moments and Duhamel’s theorem is used to solve this nonlinear equation. The developed solution is validated by fine-grid numerical simulations. The presented model can recover the shape factor of slightly compressible fluids reported in the literature. This study demonstrates that in the case of a single-phase flow of compressible fluid, the shape factor is a function of the imposed boundary condition in the Fracture and its variability with time. It is shown that such dependence can be described by an exponentially declining Fracture Pressure with different decline exponents. These findings improve our understanding of fluid flow in Fractured porous media.
Ki-bok Min - One of the best experts on this subject based on the ideXlab platform.
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Hydraulic fracturing initiation and propagation in deep inclined open hole for Enhanced Geothermal System
Geothermics, 2017Co-Authors: Linmao Xie, Ki-bok MinAbstract:Abstract This paper describes the development of a generic geomechanical model for estimating the Fracture initiation in open hole section and the overall fracturing propagation during the hydraulic stimulation in Enhanced Geothermal System. General studies on the effects in situ stress and open hole trajectory on hydraulic fracturing indicate that 1) the upward growth of vertical Fracture is expected for normal faulting and strike slip stress regimes; 2) the Fracture initiation at casing shoe section prevails for common stress range at deep formation; 3) an inclined open hole tends to decrease Fracture Pressure gradient for normal faulting and reverse faulting stress regimes and 4) an open hole with building up trajectory may shift Fracture initiation location from casing shoe to well toe by a lower breakdown Pressure. The proposed model predicts Fracture initiation at well toe location for Jolokia-1 stimulation by NaBr brine.
Ehsan Ranjbar - One of the best experts on this subject based on the ideXlab platform.
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effect of Fracture Pressure depletion regimes on the dual porosity shape factor for flow of compressible fluids in Fractured porous media
Advances in Water Resources, 2011Co-Authors: Ehsan Ranjbar, Hassan Hassanzadeh, Zhangxin ChenAbstract:A precise value of the matrix-Fracture transfer shape factor is essential for modeling fluid flow in Fractured porous media by a dual-porosity approach. The slightly compressible fluid shape factor has been widely investigated in the literature. In a recent study, we have developed a transfer function for flow of a compressible fluid using a constant Fracture Pressure boundary condition [Ranjbar E, Hassanzadeh H, Matrix-Fracture transfer shape factor for modeling flow of a compressible fluid in dual-porosity media. Adv Water Res 2011;34(5):627–39. doi:10.1016/j.advwatres.2011.02.012]. However, for a compressible fluid, the consequence of a Pressure depletion boundary condition on the shape factor has not been investigated in the previous studies. The main purpose of this paper is, therefore, to investigate the effect of the Fracture Pressure depletion regime on the shape factor for single-phase flow of a compressible fluid. In the current study, a model for evaluation of the shape factor is derived using solutions of a nonlinear diffusivity equation subject to different Pressure depletion regimes. A combination of the heat integral method, the method of moments and Duhamel’s theorem is used to solve this nonlinear equation. The developed solution is validated by fine-grid numerical simulations. The presented model can recover the shape factor of slightly compressible fluids reported in the literature. This study demonstrates that in the case of a single-phase flow of compressible fluid, the shape factor is a function of the imposed boundary condition in the Fracture and its variability with time. It is shown that such dependence can be described by an exponentially declining Fracture Pressure with different decline exponents. These findings improve our understanding of fluid flow in Fractured porous media.
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effect of Fracture Pressure depletion regimes on the dual porosity shape factor for flow of compressible fluids in Fractured porous media
Advances in Water Resources, 2011Co-Authors: Ehsan Ranjbar, Hassan Hassanzadeh, Zhangxin ChenAbstract:A precise value of the matrix-Fracture transfer shape factor is essential for modeling fluid flow in Fractured porous media by a dual-porosity approach. The slightly compressible fluid shape factor has been widely investigated in the literature. In a recent study, we have developed a transfer function for flow of a compressible fluid using a constant Fracture Pressure boundary condition [Ranjbar E, Hassanzadeh H, Matrix-Fracture transfer shape factor for modeling flow of a compressible fluid in dual-porosity media. Adv Water Res 2011;34(5):627–39. doi:10.1016/j.advwatres.2011.02.012]. However, for a compressible fluid, the consequence of a Pressure depletion boundary condition on the shape factor has not been investigated in the previous studies. The main purpose of this paper is, therefore, to investigate the effect of the Fracture Pressure depletion regime on the shape factor for single-phase flow of a compressible fluid. In the current study, a model for evaluation of the shape factor is derived using solutions of a nonlinear diffusivity equation subject to different Pressure depletion regimes. A combination of the heat integral method, the method of moments and Duhamel’s theorem is used to solve this nonlinear equation. The developed solution is validated by fine-grid numerical simulations. The presented model can recover the shape factor of slightly compressible fluids reported in the literature. This study demonstrates that in the case of a single-phase flow of compressible fluid, the shape factor is a function of the imposed boundary condition in the Fracture and its variability with time. It is shown that such dependence can be described by an exponentially declining Fracture Pressure with different decline exponents. These findings improve our understanding of fluid flow in Fractured porous media.
Hassan Hassanzadeh - One of the best experts on this subject based on the ideXlab platform.
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effect of Fracture Pressure depletion regimes on the dual porosity shape factor for flow of compressible fluids in Fractured porous media
Advances in Water Resources, 2011Co-Authors: Ehsan Ranjbar, Hassan Hassanzadeh, Zhangxin ChenAbstract:A precise value of the matrix-Fracture transfer shape factor is essential for modeling fluid flow in Fractured porous media by a dual-porosity approach. The slightly compressible fluid shape factor has been widely investigated in the literature. In a recent study, we have developed a transfer function for flow of a compressible fluid using a constant Fracture Pressure boundary condition [Ranjbar E, Hassanzadeh H, Matrix-Fracture transfer shape factor for modeling flow of a compressible fluid in dual-porosity media. Adv Water Res 2011;34(5):627–39. doi:10.1016/j.advwatres.2011.02.012]. However, for a compressible fluid, the consequence of a Pressure depletion boundary condition on the shape factor has not been investigated in the previous studies. The main purpose of this paper is, therefore, to investigate the effect of the Fracture Pressure depletion regime on the shape factor for single-phase flow of a compressible fluid. In the current study, a model for evaluation of the shape factor is derived using solutions of a nonlinear diffusivity equation subject to different Pressure depletion regimes. A combination of the heat integral method, the method of moments and Duhamel’s theorem is used to solve this nonlinear equation. The developed solution is validated by fine-grid numerical simulations. The presented model can recover the shape factor of slightly compressible fluids reported in the literature. This study demonstrates that in the case of a single-phase flow of compressible fluid, the shape factor is a function of the imposed boundary condition in the Fracture and its variability with time. It is shown that such dependence can be described by an exponentially declining Fracture Pressure with different decline exponents. These findings improve our understanding of fluid flow in Fractured porous media.
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effect of Fracture Pressure depletion regimes on the dual porosity shape factor for flow of compressible fluids in Fractured porous media
Advances in Water Resources, 2011Co-Authors: Ehsan Ranjbar, Hassan Hassanzadeh, Zhangxin ChenAbstract:A precise value of the matrix-Fracture transfer shape factor is essential for modeling fluid flow in Fractured porous media by a dual-porosity approach. The slightly compressible fluid shape factor has been widely investigated in the literature. In a recent study, we have developed a transfer function for flow of a compressible fluid using a constant Fracture Pressure boundary condition [Ranjbar E, Hassanzadeh H, Matrix-Fracture transfer shape factor for modeling flow of a compressible fluid in dual-porosity media. Adv Water Res 2011;34(5):627–39. doi:10.1016/j.advwatres.2011.02.012]. However, for a compressible fluid, the consequence of a Pressure depletion boundary condition on the shape factor has not been investigated in the previous studies. The main purpose of this paper is, therefore, to investigate the effect of the Fracture Pressure depletion regime on the shape factor for single-phase flow of a compressible fluid. In the current study, a model for evaluation of the shape factor is derived using solutions of a nonlinear diffusivity equation subject to different Pressure depletion regimes. A combination of the heat integral method, the method of moments and Duhamel’s theorem is used to solve this nonlinear equation. The developed solution is validated by fine-grid numerical simulations. The presented model can recover the shape factor of slightly compressible fluids reported in the literature. This study demonstrates that in the case of a single-phase flow of compressible fluid, the shape factor is a function of the imposed boundary condition in the Fracture and its variability with time. It is shown that such dependence can be described by an exponentially declining Fracture Pressure with different decline exponents. These findings improve our understanding of fluid flow in Fractured porous media.
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Effects of Fracture Boundary Conditions on Matrix-Fracture Transfer Shape Factor
Transport in Porous Media, 2006Co-Authors: Hassan Hassanzadeh, Mehran Pooladi-darvishAbstract:The matrix-Fracture transfer shape factor is one of the important parameters in modeling naturally Fractured reservoirs. Four decades after Warren and Root (1963, SPEJ , 245–255.) introduced the double porosity concept and suggested a relation for it, this parameter is still not completely understood. Even for a single-phase flow problem, investigators report different shape factors. This study shows that for a single-phase flow in a particular matrix block, the shape factor that Warren and Root defined is not unique and depends on the Pressure in the Fracture and how it changes with time. We use the Laplace domain analytical solutions of the diffusivity equation for different geometries and different boundary conditions to show that the shape factor depends on the Fracture Pressure change with time. In particular, by imposing a constant Fracture Pressure as it is typically done, one obtains the shape factor that Lim and Aziz (1995, J. Petrolean Sci. Eng . 13 , 169.) calculated. However, other shape factors, similar to those reported in other studies are obtained, when other boundary conditions are chosen. Although, the time variability of the boundary conditions can be accounted for by the Duhamel’s theorem, in practice using large time-steps in numerical simulations can potentially introduce large errors in simulation results. However, numerical simulation models make use of a stepwise approximation of this theorem. It is shown in this paper that this approximation could lead to large errors in matrix-Fracture transfer rate if large time-steps are chosen.
Juan Zhang - One of the best experts on this subject based on the ideXlab platform.
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reducing the minimum miscibility Pressure of co2 and crude oil using alcohols
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019Co-Authors: Zihao Yang, Zhaoxia Dong, Meiqin Lin, Shuwei Zhang, Juan ZhangAbstract:Abstract The establishment of a miscible phase between CO2 and crude oil can significantly improve CO2 flooding efficiency. However, the minimum miscibility Pressure (MMP) between CO2 and crude oil is usually higher than the Fracture Pressure of the formation, how to reduce the MMP between CO2 and crude oil is very important, and there are fewer related studies. Our inspiration for reducing MMP comes from the unique dispersion characteristics of CO2 in alcohol, the intermolecular force of crude oil may decrease due to the existence of alcohols. In this paper, the CO2 solubility and the oil volume expansion with adding a variety of alcohols (1-butanol, 1-pentanol and 1-hexanol) were measured by a visible high temperature and high Pressure cell from 7 MPa to 20 MPa at 343.15 K. The MMP between CO2 and crude oil is predicted by measuring the interfacial tension (IFT) between CO2 and crude oil from 2 MPa to 43.3 MPa at 343.15 K. The results showed that the CO2 solubility in crude oil and the oil volume expansion were greatly improved due to the addition of alcohols. Especially 1-butanol, 1-pentanol and 1-hexanol were mixed by 8:1:1(volume ratio), 5% (volume ratio) alcohols mixture was added to the crude oil, the CO2 solubility in crude oil increased by 28.74% at 345.15 K and 19 MPa, and the volume expansion coefficient of crude oil also increased by 4.45% at 345.15 K and 14 MPa. It is encouraging to note that the MMP between CO2 and crude oil decreases by 9.21% after adding 5% alcohols mixture into crude oil. This article is able to provide a new technique for reducing the MMP between CO2 and crude oil in the field of enhanced oil recovery.
