Publications

A water flood project in the Southwest Wanda Field, Sunda Basin Southeast Sumatra (SES) Block has been established since 2002. The complexity of fault configuration and reservoir connectivity were the main problems for production and water flood implementation in this area. Short production lifetimes occur due to the compartmentalized area and unconnected reservoir. The Southwest Wanda Field was discovered in 1983 and started production from Talang Akar Formation (TAF) C-3 sand reservoir in 1998 with peak production reaching 7000 barrel oil per day (BOPD) from only 3 production wells (NB-4, SW-2, and SW-3). Due to limited reservoir distribution and rapid pressure decline, these three wells only sustained for three (3) years production and the shut in was due to lack of reservoir pressure and a gas lock problem with last oil potential below 100 BOPD from those wells. In 2002, the NB-4 well, structurally located at the lowest structure amongst the three (3) producers, was converted into an injector well and started injecting for a short period. The offset producer well was located around 1.1 kilometers laterally and 150 ft vertically. With well data limitation and short production lifetime, this field was temporarily abandoned and put on the low priority list. Integrated methods were conducted to find out the remaining oil potential from this field and analyze the proper method to return this field to production. Geostatistical seismic inversion approaches were established to predict the possibility of lateral reservoir distribution and used as a basis for building a static model complete with uncertainty and realization scenarios. Dynamic simulation with reservoir simulation was established for history matching and pursuing the goal as a basis for further production scenarios and field management. Based on simulation, a working plan was established for re-developing this field along with maintaining the reservoir pressure. The existing injector was reactivated in 2011 and started injecting to maintain reservoir pressure. Reservoir pressure increased from 300 psi up to 800 psi and the producer well could produce oil up to a rate of 1500 BOPD.