The Experts below are selected from a list of 15 Experts worldwide ranked by ideXlab platform
E. Steve Adewole - One of the best experts on this subject based on the ideXlab platform.
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Type Curves for a Reservoir Subject to Active Bottom Water Drive
Advanced Materials Research, 2013Co-Authors: I. Eiroboyi, E. Steve AdewoleAbstract:The use of Dimensionless pressure and Dimensionless pressure Derivative type curves has fully overcome the challenges experienced in the use of straight line methods and has brought about major successes in well tests analyses. Flow periods and reservoir boundary types are easily delineated and identified with the use of these curves. Furthermore, near wellbore characterization results are now more reliable. In this study, type curves for a reservoir subject to bottom water energy and a vertical well completion are developed to reveal specific signatures that can be used to achieve efficient pressure test analysis. Both early and late flow periods were considered for a wellbore of negligible skin and wellbore storage influences. Results obtained show that Dimensionless pressures depart from infinite-acting behavior and attain steady state at Dimensionless time of order proportional to the square of Dimensionless reservoir thickness. Wellbore Dimensionless radius affects Dimensionless time of attainment of steady state inversely, which is rather accelerated by large fluid withdrawal rates (large pressure drawdown). On the other hand, Dimensionless pressure Derivatives show gradual collapse to zero after expiration of infinite flow. The rate of collapse is strongly affected by wellbore properties and pressure drawdown. Radial flow is generally characterized by a constant slope of 1.151 during which period the Dimensionless pressure Derivative gave a value of 0.5. Following assumption of negligible wellbore skin and storage, no early time hump is observed on Dimensionless Derivative curves.
Daniel A. Scherson - One of the best experts on this subject based on the ideXlab platform.
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Beam Probe Deflection Analysis of Redox Active Species Irreversibly Adsorbed on Electrode Surfaces
Journal of The Electrochemical Society, 2007Co-Authors: J.‐t. Wang, Zhenghao Wang, Daniel A. SchersonAbstract:Theoretical aspects of probe beam deflection (PBD) as applied to voltammetric studies of redox active species irreversibly adsorbed on a flat electrode surface have been examined using Week's numerical inverse Laplace transform algorithm. Excellent agreement was found between the time-resolved profiles calculated based on this approach and those obtained via conventional space-time discretization techniques over the interval of relevance to actual experimental measurements. In agreement with the behavior reported elsewhere for related systems, the shape of the PBD response is highly sensitive to the distance between the probing beam and the electrode surface. In particular, plots of the Dimensionless Derivative of the concentration of the electrolyte with respect to the Dimensionless distance normal to the electrode surface, X (which is proportional to the deflection), ∂θ/∂Χ vs Dimensionless time, T (or, equivalently, potential, for voltammetric measurements) for small Χ, yielded curves similar to the voltammetric behavior of a redox active solution phase species in a thin layer cell configuration (which closely resemble the voltammetry of the actual adsorbed redox couple). As Χ was increased, however, the ∂θ/∂Χ vs T curves acquired characteristics reminiscent of solution-phase voltammetry recorded with a microelectrode and farther away with a larger electrode. Further evidence of the accuracy of Week's method was obtained from the analysis of square-wave periodic boundary conditions at the interface, which yielded time-resolved profiles away from the interface, in harmony with the analytical solutions published in the literature.
I. Eiroboyi - One of the best experts on this subject based on the ideXlab platform.
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Type Curves for a Reservoir Subject to Active Bottom Water Drive
Advanced Materials Research, 2013Co-Authors: I. Eiroboyi, E. Steve AdewoleAbstract:The use of Dimensionless pressure and Dimensionless pressure Derivative type curves has fully overcome the challenges experienced in the use of straight line methods and has brought about major successes in well tests analyses. Flow periods and reservoir boundary types are easily delineated and identified with the use of these curves. Furthermore, near wellbore characterization results are now more reliable. In this study, type curves for a reservoir subject to bottom water energy and a vertical well completion are developed to reveal specific signatures that can be used to achieve efficient pressure test analysis. Both early and late flow periods were considered for a wellbore of negligible skin and wellbore storage influences. Results obtained show that Dimensionless pressures depart from infinite-acting behavior and attain steady state at Dimensionless time of order proportional to the square of Dimensionless reservoir thickness. Wellbore Dimensionless radius affects Dimensionless time of attainment of steady state inversely, which is rather accelerated by large fluid withdrawal rates (large pressure drawdown). On the other hand, Dimensionless pressure Derivatives show gradual collapse to zero after expiration of infinite flow. The rate of collapse is strongly affected by wellbore properties and pressure drawdown. Radial flow is generally characterized by a constant slope of 1.151 during which period the Dimensionless pressure Derivative gave a value of 0.5. Following assumption of negligible wellbore skin and storage, no early time hump is observed on Dimensionless Derivative curves.
J.‐t. Wang - One of the best experts on this subject based on the ideXlab platform.
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Beam Probe Deflection Analysis of Redox Active Species Irreversibly Adsorbed on Electrode Surfaces
Journal of The Electrochemical Society, 2007Co-Authors: J.‐t. Wang, Zhenghao Wang, Daniel A. SchersonAbstract:Theoretical aspects of probe beam deflection (PBD) as applied to voltammetric studies of redox active species irreversibly adsorbed on a flat electrode surface have been examined using Week's numerical inverse Laplace transform algorithm. Excellent agreement was found between the time-resolved profiles calculated based on this approach and those obtained via conventional space-time discretization techniques over the interval of relevance to actual experimental measurements. In agreement with the behavior reported elsewhere for related systems, the shape of the PBD response is highly sensitive to the distance between the probing beam and the electrode surface. In particular, plots of the Dimensionless Derivative of the concentration of the electrolyte with respect to the Dimensionless distance normal to the electrode surface, X (which is proportional to the deflection), ∂θ/∂Χ vs Dimensionless time, T (or, equivalently, potential, for voltammetric measurements) for small Χ, yielded curves similar to the voltammetric behavior of a redox active solution phase species in a thin layer cell configuration (which closely resemble the voltammetry of the actual adsorbed redox couple). As Χ was increased, however, the ∂θ/∂Χ vs T curves acquired characteristics reminiscent of solution-phase voltammetry recorded with a microelectrode and farther away with a larger electrode. Further evidence of the accuracy of Week's method was obtained from the analysis of square-wave periodic boundary conditions at the interface, which yielded time-resolved profiles away from the interface, in harmony with the analytical solutions published in the literature.
Zhenghao Wang - One of the best experts on this subject based on the ideXlab platform.
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Beam Probe Deflection Analysis of Redox Active Species Irreversibly Adsorbed on Electrode Surfaces
Journal of The Electrochemical Society, 2007Co-Authors: J.‐t. Wang, Zhenghao Wang, Daniel A. SchersonAbstract:Theoretical aspects of probe beam deflection (PBD) as applied to voltammetric studies of redox active species irreversibly adsorbed on a flat electrode surface have been examined using Week's numerical inverse Laplace transform algorithm. Excellent agreement was found between the time-resolved profiles calculated based on this approach and those obtained via conventional space-time discretization techniques over the interval of relevance to actual experimental measurements. In agreement with the behavior reported elsewhere for related systems, the shape of the PBD response is highly sensitive to the distance between the probing beam and the electrode surface. In particular, plots of the Dimensionless Derivative of the concentration of the electrolyte with respect to the Dimensionless distance normal to the electrode surface, X (which is proportional to the deflection), ∂θ/∂Χ vs Dimensionless time, T (or, equivalently, potential, for voltammetric measurements) for small Χ, yielded curves similar to the voltammetric behavior of a redox active solution phase species in a thin layer cell configuration (which closely resemble the voltammetry of the actual adsorbed redox couple). As Χ was increased, however, the ∂θ/∂Χ vs T curves acquired characteristics reminiscent of solution-phase voltammetry recorded with a microelectrode and farther away with a larger electrode. Further evidence of the accuracy of Week's method was obtained from the analysis of square-wave periodic boundary conditions at the interface, which yielded time-resolved profiles away from the interface, in harmony with the analytical solutions published in the literature.