2017_EJRNL_PP_HU_JIA_11.pdf
Terbatas  Suharsiyah
» Gedung UPT Perpustakaan
Terbatas  Suharsiyah
» Gedung UPT Perpustakaan
Air injection is a good option to development light oil reservoir. As well-known that, reservoir heterogeneity has great effect for various EOR processes. This also applies to air injection. However, oil recovery
mechanisms and physical processes for air injection in heterogeneous reservoir with dip angle are still
not well understood. The reported setting of reservoir heterogeneous for physical model or simulation
model of air injection only simply uses different-layer permeability of porous media. In practice, reservoir heterogeneity follows the principle of geostatistics. How much of contrast in permeability actually
challenges the air injection in light oil reservoir? This should be investigated by using layered porous
medial settings of the classical Dykstra-Parsons style. Unfortunately, there has been no work addressing
this issue for air injection in light oil reservoir. In this paper, Reservoir heterogeneity is quantified based
on the use of different reservoir permeability distribution according to classical Dykstra-Parsons coefficients method. The aim of this work is to investigate the effect of reservoir heterogeneity on physical
process and production performance of air injection in light oil reservoir through numerical reservoir
simulation approach. The basic model is calibrated based on previous study. Total eleven pseudo compounders are included in this model and ten complexity of reactions are proposed to achieve the reaction
scheme. Results show that oil recovery factor is decreased with the increasing of reservoir heterogeneity
both for air and N2 injection from updip location, which is against the working behavior of air injection
from updip location. Reservoir heterogeneity sometimes can act as positive effect to improve sweep
efficiency as well as enhance production performance for air injection. High O2 content air injection can
benefit oil recovery factor, also lead to early O2 breakthrough in heterogeneous reservoir. Well-type does
not show great effect on production performance for air injection in extreme heterogeneous reservoir.
While adopting horizontal producer is favourable to promote production performance for air injection in
homogenous reservoir.