Application of New Compositional Simulation Approach to Model Gravity Segregation In Volatile Oil Reservoirs
Abstract
In this paper, we investigate the recovery performance of gas injection from volatile oil
reservoirs. Cross-sectional reservoir studies for investigating the gravity segregation during
depletion and gas cycling in volatile oil reservoirs is discussed. Furthermore the effects
of vertical permeability on gravity segregation in a homogeneous and horizontal reservoirs
are investigated.
A new efficient compositional simulation approach was used in this study to investigate
the influence of gravity segregation and their magnitude in the case of lean gas injection
into a volatile oil reservoir. The new compositional simulation approach was validated
through analytical and numerical methods, and it is unconditionally stable and as stable
as fully compositional model.
The results show that an increase in vertical to horizontal permeability ratios results in
an increase in the effect of gravity segregation and yield early gas breakthrough. On the
other hand, the smaller the permeability ratios (vertical to horizontal), better are the recoveries
due to resulting even layer sweeps. Gravity forces have a considerable effect on
volatile oil recovery via gas injection and the need for determining not only the fluid
characteristics but also the reservoir heterogeneities was significant.
Keywords
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DOI: https://doi.org/10.29017/SCOG.33.3.661
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