Bati Raman Field Immiscible CO2 Application--Status Quo and Future Plans

Abstract The Bati Raman field is the largest oil field in Turkey and contains some 1.85 billion barrels of oil initially in place. The oil is heavy (12 o API) with high viscosity and low solution gas. Primary recovery has been inefficient, less than 2% of OOIP. Over the period of primary recovery, from 1961 to 1986, the reservoir underwent extensive pressure depletion from 1,800 psig to as low as 400 psig in some regions, with a related production decline from a peak of approximately 9,000 Bbls/day to 1600 Bbls/day. In March 1986, a CO 2 injection pilot scheme in a 1200 acre area containing 33 wells was initiated in the west portion of the field. The gas injection was initially cyclic; “huff and puff” method was applied. Later, in 1988, the gas injection scheme was converted to a CO 2 flood process. Later, the process was widespread to cover the whole field. A peak daily production rate 13000 STB/d was achieved in 1993 in comparison to what would have been less than 1600 STB/d without CO