Publications

T field is a dry gas producing field, PSC in North of Bali. T field was discovered in 1983 and the first gas production was in 2012 with 5 horizontal subsea wells in total. T field has two compartments which are an east compartment (T-3 well) and a west compartment (T-1, T-2, T-4, and T-5), and separated by one big fault. At the early stage of production, T-1 well put as the observation well to obtain the shut-in pressure become the only matching target in reservoir simulation. History matching study could propose the model that can predict T-3 well water breakthrough event in first out the five wells; however, the matching only on T-1 shut-in pressure lead into a more optimistic GIP estimation. Eventually, unpredicted water breakthrough occurred on T-4 well shows the over estimation of gas in-place on the primary history matching study. T field reservoir definition need to be revised by considering the possibility of fault sealing mechanism, local heterogeneity around the wells, rock compaction changes as the function of pressure, rock properties, and the other supporting data. The team has successfully established a reference case with a moderate gas in-place that is able to history matched the timing of T-4 water breakthrough event. This study is valuable for Kangean Energy Indonesia to forecast the performance of T field.