Considerable volume of the reservoir oil are left-behind at the end of primary depletion and later oil recovery methods. Employing the proper EOR methods can maximize oil recovery from the target reservoir. Each recovery process is associated with the various fundamental theories and mechanisms. Enhanced oil recovery methods are all the technique of recovering crude oil, condensate or natural gas liquids that requires the utilization of energy and/or materials. – assisted gravity drainage EOR process is a top-down process in which gas is injected in the gas-cap through vertical or horizontal wells at a rate lower than the critical rate. In this research two sensitivity analysis done first grid block size in X and Z direction and the second is numerical method, increasing the grid block size in X direction has a positive impact on oil recovery and for Z direction is vice versa .
Keywords: Gravity Drainage , Grid Block Size , Numerical Method .
Caudle, B. H., and Dyes, A. B.,Improving Miscible Displacement by Gas-Water Injection, Transactions of AIME, 1959; 213: 281-284.
Mahmoud, T. N., and Rao, D. N., Mechanisms and Performance Demonstration of the Gas-assisted Gravity Drainage Process Using Visual Models, SPE 110132 Presented at the SPE ATCE, Anaheim, CA, November 2007.
Rao, D. N., Ayirala, S. C., Kulkarni, M. M., Sharma, A. P., Development of the Gas Assisted Gravity Drainage (GAGD) Process for Improved Light Oil Recovery, SPE 89357, Presented at SPE/DOE 14th IOR Symposium, Tulsa, OK, 17-21 April 2004.
Christensen, J. R.,Stenby, E. H., and Skauge, A., Review of WAG field experience, SPE 71203, presented at 1998 SPE IPCE, Villahermosa, Mexico, 3-5 March 1998.
Lewis, O. J., Gravity Drainage in Oil Fields, Transactions of AIME, 1944; 155: 133-154.
Muskat, M., Physical Principles of Oil Production, McGraw-Hill, New York, 1949.
Rao, D. N., Development and Optimization of Gas Assisted Gravity Drainage (GAGD) Process for Improved Light oil Recovery, US-DOE Proposal, July 2001.
Rostami, B., Mechanistic Studies of Improved Oil Recovery under Forced Gravity Drainage GAGD Process, PhD thesis, Sharif University of Technology, Iran, 2009.
Akhlaghi, N., Kharrat, R., Mahdavi, S., Gas Assisted Gravity Drainage by Injection, Journal of Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, June 2012.