MoC-Based modeling and simulation of foam EOR processes in multi-layered system

Document Type

Conference Proceeding

Publication Date

1-1-2015

Abstract

Foam injection is a promising means to improve field-scale displacement efficiency, especially when a reservoir consists of multiple geological layers, the connectivity of which is minimal or absent due to the shale layers embedded in between. This study is devoted to investigating how foam EOR processes work in such heterogeneous and layered reservoir systems overcoming subsurface heterogeneity by using fractional flow analysis. This study first shows how to interpret theoretically the injection of surfactant pre flush and following foams into a single-layer system at pre-specified rock and fluid properties, and then extends the knowledge gained into multi-layer systems where the properties vary in different layers. The results in general show that the mechanisms of foam displacement strongly depends on foam properties such as gas-phase mobility reduction factors (MRF), limiting water saturation (Sw∗), and critical oil saturation (S0∗) as well as petrophysical properties of individual layers such as porosity (φ), permeability (k), relative permeability, capillary pressure (Pc) and so on. The overall sweep efficiency in a multi-layer system is very difficult to predict because of the complexity, but the mathematical framework presented in this study is shown to handle the problem successfully and reliably. A ID foam simulator developed in this study is used for verification purpose.

Publication Source (Journal or Book title)

Proceedings of the Annual Offshore Technology Conference

First Page

810

Last Page

831

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