Bati Raman Oilfield, PNN™ Tool Application Cased Study

Batı Raman field is the largest oilfield in Turkey, having an estimated 1.85 billion barrels of heavy oil reserves. It contains low-pressure, low gravity (10-13° API) oil at an average depth of 1300 m (4300 ft). The field was first put into production in 1961 and had produced 1.5 % of its reserves by 1986, when Production Company began immiscible CO2 gas injection. Since year 2000 production rate is drastically declining and the company seeks the ways to increase CO2 sweep efficiency. The expectation from the analysis done with PNN™ Tool was to locate CO2, estimate water saturation, detect unswept zones, and determine contribution of the perforations to the production. Logging task was to locate CO2, estimate water saturation, detect unswept zones, and determine contribution of the perforations to the production. Using processing and presentation of data it was possible to evaluate PNN water saturation (SWPNN), PNN porosity water (PORWPNN) and oil reserves. Measured intervals cover predominantly limestone and dolomitic limestone reservoirs, both containing some shale. Comparing saturations from the Open Hole and PNN measurements, it is notable that more producible oil is still present in the formation.