Publications

The Belida oil field is located offshore in Block B Natuna Sea, Indonesia. The field was discovered in 1989 and has been on production since 1992 with a cumulative oil production of 358 MMBO. The Belida reservoirs are Miocene sandstones of the Lower Arang and Udang formations with a small contribution from the thin and tight Intra Barat Sandstone. A total of 57 development wells have been drilled to produce the oil. Belida currently produces over 12 MBOPD with an average of 90% water cut from 27 active wells. Pressure depletion indicates a strong water drive system in both Lower Arang and Udang formations. This paper focuses on the Lower Arang formation. The EUR from the Lower Arang is estimated to be about 62% of OOIP from decline curve analysis. Based on core data, the recovery factor (RF) could be up to 65 – 66%. To get that RF in a mature and high water cut reservoir, optimization of the liquid processing rate and control of the water production are key considerations. In this study, classical reservoir engineering methods such as material balance, fractional flow, and production analysis are used to indentify the most important parameters to obtain the theoretical RF and determine how to manage them for optimal hydrocarbon recovery. Material balance was used to estimate the water influx volume. Fractional flow was used to estimate maximum RF from core data and to predict the corresponding water oil ratio (WOR). Production analysis was used to (a) forecast future individual well production rate and to compare them with the theoretical WOR in order to maximize recovery, * ConocoPhillips and (b) to indentify the maximum recovery scenario.