The Experts below are selected from a list of 177129 Experts worldwide ranked by ideXlab platform
Mariano Martín - One of the best experts on this subject based on the ideXlab platform.
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integration of wind solar and biomass over a year for the Constant Production of ch4 from co2 and water
Computers & Chemical Engineering, 2016Co-Authors: Mariano Martín, William DavisAbstract:Abstract In this paper we optimize the combination of biomass, wind and solar energy for the Constant Production of synthetic methane. Biomass is used for the Production of power and/or hydrogen. Photovoltaic solar and wind energy are used to obtain power. Water is electrolyzed generating oxygen and hydrogen, which is used to synthesize methane with CO2. The model is formulated as an MINLP. The optimization suggests the Production of power using solar energy complemented with biomass. Biomass is processed using indirect gasification and steam reforming. The hydrogen is produced from water electrolysis. The investment and Production costs are 175 M€ and 0.38 €/Nm3 respectively. A sensitivity analysis shows that biomass is preferred for prices and investment below 50 €/t and 1500 €/kW. Solar energy is used for high cost of biomass if solar incidence is above 1200 kWh/m2 yr. Wind use is restricted to low solar incidence and wind velocities above 9 m/s.
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optimal coupling of a biomass based polygeneration system with a concentrated solar power facility for the Constant Production of electricity over a year
Computers & Chemical Engineering, 2015Co-Authors: Marta Vidal, Mariano MartínAbstract:Abstract In this paper we address the integration of a polygeneration system based on biomass with a concentrated solar power facility for the Constant Production of electricity over a year long. The process is modelled as a superstructure embedding two different gasification technologies, direct and indirect, and two reforming modes, partial oxidation or steam reforming followed by gas cleaning and three alternatives for the syngas use, water gas shift reactor (WGSR) to produce hydrogen, a furnace for thermal energy Production and an open Brayton cycle. We couple this system with a concentrated solar plant that uses tower technology, molten salts and a regenerative Rankine cycle. The problem is formulated as a multi-period mixed-integer non linear programming problem (MINLP). The optimal integration involves the use of indirect gasification, steam reforming and a Brayton cycle to produce 340 MW of electricity at 0.073 €/kWh and 97 kt/yr of hydrogen as a credit.
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optimal integration of a concentrated solar plant facility with a biomass based polygeneration system
Computer-aided chemical engineering, 2014Co-Authors: Marta Vidal, Lidia Martin, Mariano MartínAbstract:Abstract In this paper we address the integration of a polygeneration system based on biomass with a concentrated solar power facility for the Constant Production of electricity over a year long. The process is modeled as a superstructure embedding two different gasification technologies, direct and indirect, and two reforming modes, partial oxidation or steam reforming, followed by gas cleaning and three alternatives for the syngas use, water gas shift reactor (WGSR) to produce hydrogen, a furnace for thermal energy Production and an open Brayton cycle. We couple this system with a concentrated solar plant that uses tower technology, molten salts energy storage, and a regenerative Rankine cycle. The problem is formulated as a multi-period mixed-integer non linear programming problem (MINLP). The optimal integration involves the use of indirect gasification and steam reforming using the Brayton cycle to produce 340 MW of electricity and 97 kt/yr of hydrogen. The electricity cost is 0.073 $$/kWh.
Wei Zhang - One of the best experts on this subject based on the ideXlab platform.
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the workflow to analyze hydraulic fracture effect on hydraulic fractured horizontal well Production in composite formation system
Advances in Geo-Energy Research, 2018Co-Authors: Jianwei Yuan, Ruizhong Jiang, Wei ZhangAbstract:Hydraulic fracturing generally leads to highly complex hydraulic networks for tight oil reservoirs. It is significant to understand the hydraulic fracture effect on well performance. As an effective tool, semi-analytical solution for well pressure transient analysis (PTA) and rate transient analysis (RTA) is used in large amount because of higher calculation efficiency than numerical solution. In this paper, the PTA and RTA methods and result of composite formation system (CFS) are shown comprehensively. Firstly, a mathematical model of multistage fractured horizontal well (MsFHW) in CFS was proposed for tight oil reservoir with different regions and formation properties. In the model, two regions with different formation parameters were distinguished. This assumption of two regions, i.e. CFS is a composite tight reservoir formed after hydraulic fracturing. Difference of finite hydraulic fracture conductivity, inclined angle of hydraulic fracture, different shapes of multi-wing fractures in perforating point are considered to make this model powerful to analyze Production performance of different MsFHW types. The inner and outer regions were assumed as dual porosity medium but single porosity medium model can also be solved by simplification. Then, the solution of MsFHW performance analysis model is obtained by source function method and the source function superposition principle which are common used in PTA and RTA. PTA for well producing at a Constant Production rate and RTA for well producing at a Constant wellbore pressure were obtained and discussed. Different flow regimes were divided for different fracture geometry situations. The effects of different MsFHW types on PTA and RTA were analyzed. The inflow performance for different hydraulic fractures were presented. Cited as : Yuan, J., Jiang, R., Zhang, W. The workflow to analyze hydraulic fracture effect on hydraulic fractured horizontal well Production in composite formation system. Advances in Geo-Energy Research, 2018, 2(3): 319-342, doi: 10.26804/ager.2018.03.09.
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The workflow to analyze hydraulic fracture effect on hydraulic fractured horizontal well Production in composite formation system
'Ausasia Science and Technology Press Pty Ltd.', 2018Co-Authors: Jianwei Yuan, Ruizhong Jiang, Wei ZhangAbstract:Hydraulic fracturing generally leads to highly complex hydraulic networks for tight oil reservoirs. It is significant to understand the hydraulic fracture effect on well performance. As an effective tool, semi-analytical solution for well pressure transient analysis (PTA) and rate transient analysis (RTA) is used in large amount because of higher calculation efficiency than numerical solution. In this paper, the PTA and RTA methods and result of composite formation system (CFS) are shown comprehensively. Firstly, a mathematical model of multistage fractured horizontal well (MsFHW) in CFS was proposed for tight oil reservoir with different regions and formation properties. In the model, two regions with different formation parameters were distinguished. This assumption of two regions, i.e. CFS is a composite tight reservoir formed after hydraulic fracturing. Difference of finite hydraulic fracture conductivity, inclined angle of hydraulic fracture, different shapes of multi-wing fractures in perforating point are considered to make this model powerful to analyze Production performance of different MsFHW types. The inner and outer regions were assumed as dual porosity medium，but single porosity medium model can also be solved by simplification. Then, the solution of MsFHW performance analysis model is obtained by source function method and the source function superposition principle which are common used in PTA and RTA. PTA for well producing at a Constant Production rate and RTA for well producing at a Constant wellbore pressure were obtained and discussed. Different flow regimes were divided for different fracture geometry situations. The effects of different MsFHW types on PTA and RTA were analyzed. The inflow performance for different hydraulic fractures were presented
Huiming Wee - One of the best experts on this subject based on the ideXlab platform.
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an integrated multi lot size Production inventory model for deteriorating item
Computers & Operations Research, 2003Co-Authors: P C Yang, Huiming WeeAbstract:The integration of Production and inventory model is one of the key factors of successful e-business. In this paper we develop a multi-lot-size Production and inventory model of deteriorating items with Constant Production and demand rates. By considering the perspectives of both the producer and the buyers, a mathematical model subject to multi-lot-size Production and distribution is developed. The JIT lot-splitting concept from raw material supply to Production and distribution is derived. The integration and lot-splitting effects with JIT implementation have contributed significantly to cost reduction.
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a single vendor and multiple buyers Production inventory policy for a deteriorating item
European Journal of Operational Research, 2002Co-Authors: P C Yang, Huiming WeeAbstract:Abstract This study develops a single-vendor, multi-buyers Production–inventory policy for a deteriorating item with a Constant Production and demand rate. A mathematical model incorporating the costs of both the vendor and the buyers is developed. It can be shown that the integrated policy results in an impressive cost reduction when it is compared with the independent decisions made by the vendor and the buyers.
Boning Zhang - One of the best experts on this subject based on the ideXlab platform.
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performance of fractured horizontal well with stimulated reservoir volume in unconventional gas reservoir
Journal of Hydrology, 2014Co-Authors: Yulong Zhao, Liehui Zhang, Jianxin Luo, Boning ZhangAbstract:Summary This paper extended the conventional multiple hydraulic fractured horizontal (MFH) well into a composite model to describe the stimulated reservoir volume (SRV) caused by hydraulic fracturing. Employing the Laplace transform, Source function, and Dirac delta function methods, the continuous linear source function for general composite dual-porosity is derived, and the solution of the MFH well in a composite gas reservoir is obtained with the numerical discrete method. Through the Stehfest numerical algorithm and Gauss elimination method, the transient pressure responses for well producing at a Constant Production rate and the Production rate vs. time for Constant bottomhole pressure are analyzed. The effects of related parameters such as natural permeability and radial of the SRV region, formation permeability and interporosity coefficient on transient pressure and Production performance are analyzed as well. The presented model and obtained results in this paper not only enrich the well testing models of such unconventional reservoir, but also can use to interpret on-site data which have significance on efficient reservoir development.
Liehui Zhang - One of the best experts on this subject based on the ideXlab platform.
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pressure transient analysis and flux distribution for multistage fractured horizontal wells in triple porosity reservoir media with consideration of stress sensitivity effect
Journal of Chemistry, 2015Co-Authors: Jingjing Guo, Haitao Wang, Liehui ZhangAbstract:Triple-porosity model is usually adopted to describe reservoirs with multiscaled pore spaces, including matrix pores, natural fractures, and vugs. Multiple fractures created by hydraulic fracturing can effectively improve the connectivity between existing natural fractures and thus increase well deliverability. However, little work has been done on pressure transient behavior of multistage fractured horizontal wells in triple-porosity reservoirs. Based on source/sink function method, this paper presents a triple-porosity model to investigate the transient pressure dynamics and flux distribution for multistage fractured horizontal wells in fractured-vuggy reservoirs with consideration of stress-dependent natural fracture permeability. The model is semianalytically solved by discretizing hydraulic fractures and Pedrosa’s transformation, perturbation theory, and integration transformation method. Type curves of transient pressure dynamics are generated, and flux distribution among hydraulic fractures for a fractured horizontal well with Constant Production rate is also discussed. Parametric study shows that major influential parameters on transient pressure responses are parameters pertinent to reservoir properties, interporosity mass transfer, and hydraulic fractures. Analysis of flux distribution indicates that flux density gradually increases from the horizontal wellbore to fracture tips, and the flux contribution of outermost fractures is higher than that of inner fractures. The model can also be extended to optimize hydraulic fracture parameters.
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performance of fractured horizontal well with stimulated reservoir volume in unconventional gas reservoir
Journal of Hydrology, 2014Co-Authors: Yulong Zhao, Liehui Zhang, Jianxin Luo, Boning ZhangAbstract:Summary This paper extended the conventional multiple hydraulic fractured horizontal (MFH) well into a composite model to describe the stimulated reservoir volume (SRV) caused by hydraulic fracturing. Employing the Laplace transform, Source function, and Dirac delta function methods, the continuous linear source function for general composite dual-porosity is derived, and the solution of the MFH well in a composite gas reservoir is obtained with the numerical discrete method. Through the Stehfest numerical algorithm and Gauss elimination method, the transient pressure responses for well producing at a Constant Production rate and the Production rate vs. time for Constant bottomhole pressure are analyzed. The effects of related parameters such as natural permeability and radial of the SRV region, formation permeability and interporosity coefficient on transient pressure and Production performance are analyzed as well. The presented model and obtained results in this paper not only enrich the well testing models of such unconventional reservoir, but also can use to interpret on-site data which have significance on efficient reservoir development.