Publications

The Handil field, discovered in 1974, is a giant mature oilfield located in the Mahakam Delta, Indonesia. The field consists of 555 accumulations and has been developed using conventional oil recovery methods: natural depletion and peripheral water injection followed by EOR gas injection in several reservoirs. The field had reached its plateau of 200,000 BOPD in 1980s which was followed by a decline in reservoir pressure and water breakthrough. The production continued to decline until reaching its lowest production levels of 12,500 BOPD in 2003.The pay zone consists of stacked fluvio-deltaic series and has been divided into 3 zones, the Shallow Zone, the Main Zone and the Deep Zone. The Deep Zone consists of primarily gas reservoirs and the Main Zone is where the most oil production of Handil was previously located, is already in the mature phase. The Shallow Zone down to 1500 mSS has excellent permeability (ranging from 200 mD to 2000 mD) with very strong aquifers. However, the sands are poorly consolidated and require challenging sand control techniques making the zone less attractive to developed. Consequently this Shallow Zone becomes the future of the oil development in Handil Field where large reserves can still be expected.The lack of interpretable seismic data, only poor 2D seismic lines, makes the well data as the most important data to interpret structure, stratigraphy and reservoir sand bodies. However, the uncertainties on fluid status and reservoir properties, especially in the shallow zone due to insufficient well log data or bad hole condition, can lead to inaccurate interpretation.A complete integrated study was launched to prepare Horizontal Well as part of the Handil Shallow development. Res D-9S was chosen as pilot project and the study includes the correlation review, the fluid status and fluid contacts review, netsand and facies maps updating, volumetric calculation and performing hypothesis on current fluid status using production history and production logging data interpretation results. Geological model and Black Oil Reservoir Simulation were then created in order to have a better geological and dynamic understanding of reservoir D-9S.The study allows predicting the remaining oil area and takes into account its remaining reserves. Horizontal well equipped with sand screen was proposed. However, in order to reduce the geological uncertainty, two pilot holes have been drilled to calibrate and prove the geological model and finally 240 m of horizontal drain has successfully been placed. The well was initially producing 1000 bopd that boasts Handil Production by 8 % and the study also identified another two horizontal well targets to be drilled in 2007. Horizontal well in the poorly consolidated reservoir and less developed area of Handil becomes indeed an important element to increase the oil production of the mature Handil Field.