Publications

Kerisi Offshore Oil Field is situated in Block-B in the South Natuna Sea. First production from Kerisi was in 2008. The challenges at Kerisi revolve around optimizing the field development and ultimate recovery from multiple stacked reservoir intervals. Methodologies for production from stacked reservoir zones as applied at Kerisi include: continuous history matching, comprehensive field optimization and surveillance, and utilization of produced gas. There are 4 reservoirs under production: 1) Upper Gabus 1A-1C, 2) Upper Gabus Massive, 3) Lower Gabus, and 4) TS-90. Three Kerisi zones (Upper Gabus 1A-1C, Upper Gabus Massive, and Lower Gabus) have excellent reservoir properties with combination drive from primary gas cap and edge aquifer. Pressure support by gas injection is only applied to the Upper Gabus Massive zone. The reservoir conditions and behavior have been modeled through the complex reservoir simulation models in Kerisi. Reservoir surveillance methods, like pressure survey and routine well testing, are conducted to gather data for history matching to improve production predictions and to ensure that maximum value is obtained from the field. This paper focuses on the use of the reservoir modeling and the reservoir management strategies that have been successfully applied in Kerisi.