Table of Contents
Journal of Petroleum Engineering
Volume 2014 (2014), Article ID 430309, 16 pages
http://dx.doi.org/10.1155/2014/430309
Research Article

Investigation of Enhanced Oil Recovery Using Dimensionless Groups in Wettability Modified Chalk and Sandstone Rocks

1Department of Reserve Replacement, Åsgard PTC, Statoil ASA, 7500 Stjørdal, Norway
2Department of Petroleum Engineering, Faculty of Science and Technology, University of Stavanger, 4036 Stavanger, Norway

Received 12 December 2013; Accepted 10 February 2014; Published 26 March 2014

Academic Editor: Guillaume Galliero

Copyright © 2014 Vahid Alipour Tabrizy. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The paper addresses enhanced oil recovery in chalk and sandstone rocks by CO2 injection, with different wettability, porosity, and permeability as well as injection rate and flooding conditions. Results indicate that an increase in Bond number has a positive effect on oil recovery whereas for capillary number, there is a limit in which recovery is improving. This limit is estimated when the pressure drop by viscous force is approximately equal to the threshold balance between capillary and gravity forces. A dimensionless group is proposed that combines the effect of capillarity, injection rate, permeability, and CO2 diffusion on the oil recovery. Recovery from all experiments in this study and reported data in the literature shows a satisfactory relationship with the proposed group.