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Claudio Alimonti - One of the best experts on this subject based on the ideXlab platform.
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using transient inflow performance relationships to model the Dynamic Interaction between reservoir and wellbore during pressure testing
Journal of Energy Resources Technology-transactions of The Asme, 2008Co-Authors: Aldo Costantini, G F Hewitt, Gioia Falcone, Claudio AlimontiAbstract:The fundamental understanding of the Dynamic Interactions between multiphase flow in the reservoir and that in the wellbore remains surprisingly weak. The classical way of dealing with these Interactions is via inflow performance relationships (IPRs), where the inflow from the reservoir is related to the pressure at the bottom of the well, which is a function of the multiphase flow behavior in the well. A steady-state IPRs are normally adopted, but their use may be erroneous when transient multiphase flow conditions occur. The transient multiphase flow in the wellbore causes problems in well test interpretation when the well is shut-in at the surface and the bottomhole pressure is measured. The pressure buildup (PBU) data recorded during a test can be dominated by transient wellbore effects (e.g., phase change, flow reversal, and re-entry of the denser phase into the producing zone), making it difficult to distinguish between true reservoir features and transient wellbore artifacts. This paper introduces a method to derive the transient IPRs at bottomhole conditions in order to link the wellbore to the reservoir during PBU. A commercial numerical simulator was used to build a simplified reservoir model (single well, radial coordinates, homogeneous rock properties) using published data from a gas condensate field in the North Sea. In order to exclude wellbore effects from the investigation of the transient inflow from the reservoir, the simulation of the wellbore was omitted from the model. Rather than the traditional flow rate at surface conditions, bottomhole pressure was imposed to constrain the simulation. This procedure allowed the flow rate at the sand face to be different from zero during the early times of the PBU, even if the surface flow rate is equal to zero. As a result, a transient IPR at bottomhole conditions was obtained for the given field case and for a specific set of time intervals, time steps, and bottomhole pressure. In order to validate the above simulation approach, a preliminary evaluation of the required experimental setup was carried out. The setup would allow the investigation of the Dynamic Interaction between the reservoir, the near-wellbore region, and the well, represented by a pressured vessel, a cylindrical porous medium, and a vertical pipe, respectively.
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using transient inflow performance relationships to model the Dynamic Interaction between reservoir and wellbore during pressure testing
ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering, 2007Co-Authors: Aldo Costantini, G F Hewitt, Gioia Falcone, Claudio AlimontiAbstract:The fundamental understanding of the Dynamic Interactions between multiphase flow in the reservoir and that in the wellbore remains surprisingly weak. The classical way of dealing with these Interactions is via inflow performance relationships (IPR’s), where the inflow from the reservoir is related to the pressure at the bottom of the well, which is a function of the multiphase flow behaviour in the well. Steady-state IPR’s are normally adopted, but their use may be erroneous when transient multiphase flow conditions occur. Transient multiphase flow in the wellbore causes problems in well test interpretation when the well is shut-in at surface and the bottomhole pressure is measured. Pressure build-up (PBU) data recorded during a test can be dominated by transient wellbore effects (e.g. phase change, flow reversal and re-entry of the denser phase into the producing zone), making it difficult to distinguish between true reservoir features and transient wellbore artefacts. This paper introduces a method to derive the transient IPR’s at bottomhole conditions in order to link the wellbore to the reservoir during PBU. A commercial numerical simulator was used to build a simplified reservoir model (single well, radial co-ordinates, homogeneous rock properties) using published data from a gas condensate field in the North Sea. In order to exclude wellbore effects from the investigation of the transient inflow from the reservoir, the simulation of the wellbore was omitted from the model. Rather than the traditional flow rate at surface conditions, bottomhole pressure was imposed to constrain the simulation. This procedure allowed the flow rate at the sand face to be different from zero during the early times of the PBU, even if the surface flow rate is equal to zero. As a result, a transient IPR at bottomhole conditions was obtained for the given field case and for a specific set of time intervals, time steps and bottomhole pressure. In order to validate the above simulation approach, a preliminary evaluation of the required experimental set-up was carried out. The set-up would allow the investigation of the Dynamic Interaction between the reservoir, the near-wellbore region and the well, represented by a pressured vessel, a cylindrical porous medium and a vertical pipe, respectively.Copyright © 2007 by ASME
Pengfei Liu - One of the best experts on this subject based on the ideXlab platform.
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effect of rail pad stiffness on vehicle track Dynamic Interaction excited by rail corrugation in metro
Transportation Research Record, 2020Co-Authors: Xiaolin Song, Kaiyun Wang, Yu Qian, Pengfei LiuAbstract:Rail corrugation can cause intense Dynamic Interaction between train and track, which can reduce riding comfort and lifespan of track structure, and even threaten running safety. Instead of investi...
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reducing rail side wear on heavy haul railway curves based on wheel rail Dynamic Interaction
Vehicle System Dynamics, 2014Co-Authors: Wanming Zhai, Jianmin Gao, Pengfei Liu, Kaiyun WangAbstract:This article investigates an optimisation strategy for the design of rail-grinding profiles to be used on heavy-haul railway curves, aiming to reduce the rail side wear on curves. A design methodology of rail asymmetric-grinding profiles is put forward based on the principle of low wheel–rail Dynamic Interaction. The implementing procedure is illustrated in detail. As a case study, the rail asymmetric-grinding profiles were designed for a curve with 600 m radius on Chinese Shuohuang heavy-haul railway. The characteristics of wheel–rail contact geometry and wheel–rail Dynamic Interaction were analysed and compared between the original standard rail profiles and the designed rail-grinding profiles. The rails on a test curve were ground according to the designed profiles. Before and after rail grinding, both the wheel–rail Dynamics indexes and the rail side wear were measured in the field. The theoretical and experimental results show that the wheel–rail Dynamic Interaction is clearly improved and the rail s...
Kaiyun Wang - One of the best experts on this subject based on the ideXlab platform.
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effect of rail pad stiffness on vehicle track Dynamic Interaction excited by rail corrugation in metro
Transportation Research Record, 2020Co-Authors: Xiaolin Song, Kaiyun Wang, Yu Qian, Pengfei LiuAbstract:Rail corrugation can cause intense Dynamic Interaction between train and track, which can reduce riding comfort and lifespan of track structure, and even threaten running safety. Instead of investi...
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wheel rail Dynamic Interaction due to excitation of rail corrugation in high speed railway
Science China-technological Sciences, 2015Co-Authors: Kaiyun Wang, Wanming Zhai, Chao Huang, Zaigang ChenAbstract:Characteristics of wheel-rail Dynamic Interaction due to the rail corrugation in a high-speed railway are analyzed based on the theory of vehicle-track coupled Dynamics in this paper. Influences of the corrugation wavelength and depth on the wheel-rail Dynamic performance are investigated. The results show that, under the excitation of a measured rail corrugation, the wheel-rail Dynamic Interaction of high-speed railway is enhanced obviously, and the high-frequency Dynamic force between wheel and rail is generated, which has an obvious impact on the vibrations of the wheelset and rail, and little effect on the vibration of the frame and carbody. If the corrugation wavelength is shorter than the sensitive wavelength, the wheel-rail vertical force will increase with the growth of the corrugation wavelength, otherwise, it will decrease. However, the wheel-rail vertical force keeps increasing with the growth of corrugation depth. Furthermore, if the corrugation wavelength is shorter than the sensitive wavelength, the wheel-rail vertical force will increase with the decrease of the running speed, otherwise, it will decrease. It is also found that the critical wavelength of corrugation increases with the growth of the corrugation depth and the running speed, and the critical depth of corrugation is nonlinearly related to the sensitive wavelength.
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reducing rail side wear on heavy haul railway curves based on wheel rail Dynamic Interaction
Vehicle System Dynamics, 2014Co-Authors: Wanming Zhai, Jianmin Gao, Pengfei Liu, Kaiyun WangAbstract:This article investigates an optimisation strategy for the design of rail-grinding profiles to be used on heavy-haul railway curves, aiming to reduce the rail side wear on curves. A design methodology of rail asymmetric-grinding profiles is put forward based on the principle of low wheel–rail Dynamic Interaction. The implementing procedure is illustrated in detail. As a case study, the rail asymmetric-grinding profiles were designed for a curve with 600 m radius on Chinese Shuohuang heavy-haul railway. The characteristics of wheel–rail contact geometry and wheel–rail Dynamic Interaction were analysed and compared between the original standard rail profiles and the designed rail-grinding profiles. The rails on a test curve were ground according to the designed profiles. Before and after rail grinding, both the wheel–rail Dynamics indexes and the rail side wear were measured in the field. The theoretical and experimental results show that the wheel–rail Dynamic Interaction is clearly improved and the rail s...
Aldo Costantini - One of the best experts on this subject based on the ideXlab platform.
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using transient inflow performance relationships to model the Dynamic Interaction between reservoir and wellbore during pressure testing
Journal of Energy Resources Technology-transactions of The Asme, 2008Co-Authors: Aldo Costantini, G F Hewitt, Gioia Falcone, Claudio AlimontiAbstract:The fundamental understanding of the Dynamic Interactions between multiphase flow in the reservoir and that in the wellbore remains surprisingly weak. The classical way of dealing with these Interactions is via inflow performance relationships (IPRs), where the inflow from the reservoir is related to the pressure at the bottom of the well, which is a function of the multiphase flow behavior in the well. A steady-state IPRs are normally adopted, but their use may be erroneous when transient multiphase flow conditions occur. The transient multiphase flow in the wellbore causes problems in well test interpretation when the well is shut-in at the surface and the bottomhole pressure is measured. The pressure buildup (PBU) data recorded during a test can be dominated by transient wellbore effects (e.g., phase change, flow reversal, and re-entry of the denser phase into the producing zone), making it difficult to distinguish between true reservoir features and transient wellbore artifacts. This paper introduces a method to derive the transient IPRs at bottomhole conditions in order to link the wellbore to the reservoir during PBU. A commercial numerical simulator was used to build a simplified reservoir model (single well, radial coordinates, homogeneous rock properties) using published data from a gas condensate field in the North Sea. In order to exclude wellbore effects from the investigation of the transient inflow from the reservoir, the simulation of the wellbore was omitted from the model. Rather than the traditional flow rate at surface conditions, bottomhole pressure was imposed to constrain the simulation. This procedure allowed the flow rate at the sand face to be different from zero during the early times of the PBU, even if the surface flow rate is equal to zero. As a result, a transient IPR at bottomhole conditions was obtained for the given field case and for a specific set of time intervals, time steps, and bottomhole pressure. In order to validate the above simulation approach, a preliminary evaluation of the required experimental setup was carried out. The setup would allow the investigation of the Dynamic Interaction between the reservoir, the near-wellbore region, and the well, represented by a pressured vessel, a cylindrical porous medium, and a vertical pipe, respectively.
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using transient inflow performance relationships to model the Dynamic Interaction between reservoir and wellbore during pressure testing
ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering, 2007Co-Authors: Aldo Costantini, G F Hewitt, Gioia Falcone, Claudio AlimontiAbstract:The fundamental understanding of the Dynamic Interactions between multiphase flow in the reservoir and that in the wellbore remains surprisingly weak. The classical way of dealing with these Interactions is via inflow performance relationships (IPR’s), where the inflow from the reservoir is related to the pressure at the bottom of the well, which is a function of the multiphase flow behaviour in the well. Steady-state IPR’s are normally adopted, but their use may be erroneous when transient multiphase flow conditions occur. Transient multiphase flow in the wellbore causes problems in well test interpretation when the well is shut-in at surface and the bottomhole pressure is measured. Pressure build-up (PBU) data recorded during a test can be dominated by transient wellbore effects (e.g. phase change, flow reversal and re-entry of the denser phase into the producing zone), making it difficult to distinguish between true reservoir features and transient wellbore artefacts. This paper introduces a method to derive the transient IPR’s at bottomhole conditions in order to link the wellbore to the reservoir during PBU. A commercial numerical simulator was used to build a simplified reservoir model (single well, radial co-ordinates, homogeneous rock properties) using published data from a gas condensate field in the North Sea. In order to exclude wellbore effects from the investigation of the transient inflow from the reservoir, the simulation of the wellbore was omitted from the model. Rather than the traditional flow rate at surface conditions, bottomhole pressure was imposed to constrain the simulation. This procedure allowed the flow rate at the sand face to be different from zero during the early times of the PBU, even if the surface flow rate is equal to zero. As a result, a transient IPR at bottomhole conditions was obtained for the given field case and for a specific set of time intervals, time steps and bottomhole pressure. In order to validate the above simulation approach, a preliminary evaluation of the required experimental set-up was carried out. The set-up would allow the investigation of the Dynamic Interaction between the reservoir, the near-wellbore region and the well, represented by a pressured vessel, a cylindrical porous medium and a vertical pipe, respectively.Copyright © 2007 by ASME
Sadakatsu Nishikawa - One of the best experts on this subject based on the ideXlab platform.
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inclusion kinetics of a nucleotide into a cyclodextrin cavity by means of ultrasonic relaxation
Journal of Physical Chemistry B, 2007Co-Authors: Minako Kondo, Sadakatsu NishikawaAbstract:To examine a Dynamic Interaction between nucleotide and cyclic oligosaccharide, ultrasonic absorption measurements were carried out in aqueous solution containing β-cyclodextrin (β-CD) and adenosin...
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molecular recognition kinetics of β cyclodextrin for several alcohols by ultrasonic relaxation method
Journal of Physical Chemistry B, 2001Co-Authors: Sadakatsu Nishikawa, And Takaho Ugawa, Takanori FukahoriAbstract:Ultrasonic absorption coefficients in aqueous solutions of 2-propanol, 2-butanol, and 2-methyl-1-propanol (guest) in concentrations less than 0.40 mol dm-3 with β-cyclodextrin (host) in the range below 0.011 mol dm-3 were measured in the frequency range 0.8−95 MHz at 25 °C. A single Debye-type relaxational absorption was found only when both solutes coexisted. From the concentration dependences of the relaxation frequency and the amplitude of the relaxation, the cause of the observed relaxation was attributed to a perturbation of a chemical equilibrium associated with a Dynamic Interaction between β-cyclodextrin and the alcohols. The rate and thermoDynamic parameters for the Dynamic Interaction were determined, and the results were compared with those for other alcoholic systems with β-cyclodextrin, which were reported previously. The isomeric effect of the guests on the Dynamic Interaction with β-cyclodextrin was considered and it is deduced from the experimental results that the hydrophobicity of the gu...
