Abstract

The Kaji Semoga Field is located in Rimau PSC Area of PT. Exspan Nusantara (Figure 1). The field was discovered by the drilling of KS-1 well in 1996. The Kaji Semoga field consists of two oil pools separated by a structural saddle, namely Kaji pool with OWC at 2851 ft Sub Sea, and Semoga pool with OWC at 2629 ft Sub Sea. Each pool also has its gas oil contact (Figure 2). Currently, the daily production of Kaji Semoga field is 60,000 BOPD with negligible water cut and has 40 MMB cumulative oil production. Oil production is mostly from Baturaja Carbonate (90% of production) with a minor contribution from the Talang Akar Sand.

A reservoir simulation model was built as a tool to lead to an optimum field development, i.e. maximum recovery, and to predict the future field production performance. The Original Oil In Place (OOIP) is approximately 400 MMB and it is expected that a minimum of 40% recovery factor could be achieved with the right development scenario.