Compositional Upscaling in Heterogeneous Reservoirs: Effect of Gravity, Capillary Pressure, and Dispersion

Ajose, D.; Mohanty, Kishore K.

doi:10.2118/84363-ms

Cited by 6 publications

(1 citation statement)

References 12 publications

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“…This allows the calculation of different phase saturations from the composition of the different hydrocarbon components in that grid block. However in many field scale simulations the size of the grid blocks (N100 m) and the time-step between solutions (days) is such that there may not be time for diffusion to equilibrate phase compositions across the whole grid block (Haajizadeh et al, 1999;Ballin et al, 2001;Ajose and Mohanty, 2003). In addition fluid saturation distributions may be nonuniform within the volume equivalent to a simulation grid block.…”

Section: Introductionmentioning

confidence: 99%

Gas–oil non-equilibrium in multicontact miscible displacements within homogeneous porous media

Al-Wahaibi

Muggeridge

Grattoni

2009

Journal of Petroleum Science and Engineering

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Section: Introductionmentioning

confidence: 99%

Gas–oil non-equilibrium in multicontact miscible displacements within homogeneous porous media

Al-Wahaibi

Muggeridge

Grattoni

2009

Journal of Petroleum Science and Engineering

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First-Contact-Miscible and Multicontact-Miscible Gas Injection within a Channeling Heterogeneity System

Al-Wahaibi

2010

Energy Fuels

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Experimentally measured recoveries, gas cuts, and residual saturations, as well as visual observations, were used to quantify the effects of a channeling heterogeneity system on the efficiency and gas/oil nonequilibrium of first-contact-miscible (FCM) and multicontact-miscible (MCM) displacements. These experiments are the first of their type, because they have enabled a direct insight into the mechanisms of gas/oil flow occurring within such type of heterogeneities, and particularly have provided a firmer understanding of the MCM processes. The key finding in this work is the fact that the produced fluids in all MCM experiments were not in compositional equilibrium. The effect of channeling heterogeneity was to reduce mass transfer between the oil and MCM gas phases throughout the porous medium as a whole, thereby driving the system to be more submiscible and, as such, reducing the sweep and increasing the bypassing. These results were also reflected in the increase in nonequilibrium between gas and oil phases. This work has proved that the channeling heterogeneities, even with small permeability contrast, can distort FCM and MCM displacement patterns considerably. In addition, the results suggested that the performance of MCM processes decrease significantly as the injection rate increases. This was probably due to an interplay between capillary and viscous forces in the heterogeneous model, causing the gas at the highest rate to flow faster into the high permeability stripe, therefore resulting in a larger transition zone, shorter miscibility region, greater nonequilibrium, and, hence, a lesser-efficient flood. This study has important implications for the correct interpretation of core data, and for scale-up processes to reservoir scale, particularly for handling gas/oil nonequilibrium when modeling MCM displacements.

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First-Contact-Miscible, Vaporizing- and Condensing-Gas Drive Processes in a Channeling Heterogeneity System

Wahaibi

Hadhrami²

2011

All Days

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Experimentally measured recoveries, gas cuts and residual saturations as well as the visual observations were used to quantify the effects of channeling heterogeneity system on efficiency and gas/oil nonequilibrium of first- and multi-contact miscible (MCM) displacements. These experiments are the first of their kind as they have enabled a direct insight into the mechanisms of gas/oil flow occurring within such type of heterogeneities, and particularly have provided a firmer understanding of the MCM processes. The key finding in this work is the fact that the produced fluids in all MCM experiments were not in compositional equilibrium. The effect of channeling heterogeneity was to lower mass transfer between oil and MCM gas phases throughout the porous medium as a whole, thereby driving the system to be more sub-miscible and as such reducing the sweep and increasing the bypassing. These results were also reflected in the increase in nonequilibrium between gas and oil phases. This work has proved that the channeling heterogeneities, even with small permeability contrast, can distort first- and multi-contact miscible displacement patterns considerably. Additionally, the results suggested that the performance of MCM processes decrease significantly with the increase in injection rate. This was probably due to an interplay between capillary and viscous forces in the heterogeneous model causing the gas at highest rate to flow faster into the high permeability stripe, and therefore resulting in a larger transition zone, shorter miscibility region, higher nonequilibrium and hence a lesser efficient flood. This study has important implications for the correct interpretation of core data, and for scale-up processes to reservoir scale, particularly for handling gas/oil nonequilibrium when modelling MCM displacements.

show abstract

Compositional Upscaling in Heterogeneous Reservoirs: Effect of Gravity, Capillary Pressure, and Dispersion

Cited by 6 publications

References 12 publications

Gas–oil non-equilibrium in multicontact miscible displacements within homogeneous porous media

Gas–oil non-equilibrium in multicontact miscible displacements within homogeneous porous media

First-Contact-Miscible and Multicontact-Miscible Gas Injection within a Channeling Heterogeneity System

First-Contact-Miscible, Vaporizing- and Condensing-Gas Drive Processes in a Channeling Heterogeneity System

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