Perpustakaan Digital ITB

The Indonesian government has set a target to reduce the consumption-production gap by increasing national oil production to 1 million barrels of oil per day (BOPD) and 12 billion standard cubic feet per day (BSCFD) of gas. Amongst several ap-proaches, the optimization of mature fields offers a significant opportunity for quick production gains. However, analyzing these fields presents challenges due to the complexity, incompleteness, and poor quality of historical data. Heterogeneity Index (HI) is one of the methods that quickly measure well perfor-mance. This method is as simple as measuring a certain well as compared to the average performance at certain time. The parameter being used might vary, but production data is the most frequent one given its availability. Despite simple and practical, skepticism on the reliability of this method is still questionable. This work revisited “XYZ” field consisting of 47 wells producing more than 32 years with hundreds of workovers. We brought evidences and insights on how Het-erogeneity Index leads to the workover success. Other key factors such as well positioning, workover type and EUR analysis are also considered. Apriori algo-rithm, an Association Rule Mining (ARM) technique, is employed to uncover rules from the data. The results show that workover on wells with low HI mostly leads to success. Proper treatment and volume analysis is other key factors one should consider.