Publications

Semoga Field is producing from Baturaja (BRF) limestone and Telisa (TLS) sandstone formation. BRF formation has experienced decline in production and currently suffers from high watercut (98% average). In order to sustain the field production, it is required to boost the production from other formation. The existing TLS recovery factor (RF) is still below 2% and considered as the future backbone of Rimau block. The formation considered as low permeability reservoir with high heterogeneity. Therefore, hydraulic fracturing is considered as the best stimulation method which allows to increase drainage area and gives higher oil recovery in tight reservoir. Since the beginning of TLS production, various fracturing technologies has been utilized and only single parameter as resistivity was used for identification of candidate selection. Thus, the average oil cumulative is still considered low and cost per barrels needs to be reduced. Therefore, improvements on characterization of oil potential and fracturing techniques are considered crucial to boost the production. Series of collaborative studies involving internal and external parties were done to generate workover guidelines in TLS in Semoga field, starting from reservoir and geomechanic modelling, improvement on parameterization for candidate selection criteria by correlating reservoir properties to production performance, applying fit-to-purpose fracturing design and technology, reorganize fracturing contract strategy, and generate effective job scheduling. By complying these guidelines, the average oil cumulative improved from 8.3 MBO on 2014-2017 to 12.8 MBO in 2018 and cost per barrel reduced from 30.7 US$/MBO on 2014-2017 to 16.4 US$/MBO in 2018. Also, it will unlock the potency on having 35 workovers. This plan will allow additional oil contribution and gives 2.2% additional number of the existing recovery factor (RF) on P2 area.