A matured field is currently producing with greater than 85% water cut (WC) and has significant levels of uncertainty with respect to oil/water contact (OWC), flank structure, depth of spill points, production allocation, and residual oil saturation. A robust work flow was developed to identify infill opportunities by integrating material-balance study, cased-hole-log information, water diagnostic plots, decline-curve analysis, and other information. The comprehensive locate-the-remaining-oil (LTRO) methodologies applied have been successful and have helped to estimate the potential reserves as well.
Introduction
The field is 20 km offshore Sarawak, Malaysia, in water depths of 100 ft. The field structure consists of a 30,000×9,000‑ft elongated anticline running northeast/southwest and comprises a series of stacked reservoirs at a depth of 4,000 to 9,500 ft.
