Title: Experimental investigation of water alternating CH4-CO2 mixture gas injection in light oil reservoirs

Authors: Ali Alizadeh; Mohammad Hossein Ghazanfari; Vahid Taghikhani; Amir Badakhshan

Addresses: Department of Petroleum Engineering, Amirkabir University of Technology, Hafez St., Azadi Ave., Tehran Iran ' Department of Chemical and Petroleum Engineering, Sharif University of Technology, Floor 4, Azadi Ave., Tehran, Iran ' Department of Chemical and Petroleum Engineering, Sharif University of Technology, Floor 4, Azadi Ave., Tehran, Iran ' Department of Chemical and Petroleum Engineering, Sharif University of Technology, Floor 4, Azadi Ave., Tehran, Iran

Abstract: This paper studies a WAG process for improving the recovery efficiency in light oil reservoirs. Until now, few references have reported the role of CO2 mole percent on recovery improvement in light oil reservoirs. The injected gas was changed, and the effect of composition changes on performance of core flood experiments were conducted at fixed flow rate. Five series of experiments (varied in methane mole percentages, 0, 25, 50, and 75, 100) were systematically examined. The results indicated that the oil recovery efficiency improved with the increasing of CO2 mole ratio and there was also maximum recovery efficiency in this work. That would be helpful to better understanding the role of CO2 mole percent on performance of WAG injection in light oil reservoirs. [Received: June 05, 2012; Accepted: May 27, 2013].

Keywords: experimental; water alternating gas; WAG injection; hydrocarbon-CO2 mixture; WAG ratio; CO2 mole percent; carbon dioxide; hydrocarbon; gas injection; light oil reservoirs; methane; oil recovery efficiency.

DOI: 10.1504/IJOGCT.2014.064424

International Journal of Oil, Gas and Coal Technology, 2014 Vol.8 No.1, pp.31 - 40

Received: 05 Jun 2012
Accepted: 27 May 2013

Published online: 18 Sep 2014 *

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