This paper examines the prospect of Gas Assisted Gravity Drainage (GAGD) process in improving recovery from a sandstone reservoir by injecting produced gas back into the crestal part of the reservoir. Besides recovery improvement, immiscible gas injection ensures near Zero Flaring strategy. The process has been found to be ideal in reservoirs with high permeability and reasonable dip to maximize oil production wherever a sufficient gas source exists. Based on the study, gas injection is recommended at the crestal part of the reservoir under study at the rate equivalent to the produced gas to maintain pressure, arrest gas cap shrinkage and improve recovery.
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Challa R.K. Murty, Mohammed Fathalla and Faisal M. Al-Mahroos, "Reservoir Performance Analysis of Arab D Zone (Bahrain Field)", The Bahrain National Oil Co., Middle East Oil Technical Conference of the Society of Petroleum Engineers held in Manama, Bahrain, 1983, SPE 11491
C.R.K Murty and S.S. Al-Khayat, " Gas Injection in a Saturated Oil Reservoir", Bahrain National Oil Company, SPE Middle East Oil Technical Conference and Exhibition held in Manama, Bahrain, 1989, SPE 17991
M.H. Wei, J.P. Yu, D.M. Moore, and Nnaemeka Ezekwe, Bechtel Petroleum Operations Inc., M.E. Querin, U.S. DOE, and L.L. Williams, Chevron USA Inc., "Case History of Pressure Maintenance by Crestal Gas Injection in the 26R Gravity Drainage Reservoir", Western Regional Meeting held in Bakersfield, California, March 30-April 1, 1992, SPE 24035
Petrowiki website, "Immiscible gas injection Performance"
L.P Dake "Fundamentals of Reservoir Engineering"
Tarek Ahmed, "Reservoir Engineering Handbook"
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