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fax 01-972-952-9435. AbstractThe Handil field, discovered in 1974, is a giant mature oilfield located in the Mahakam Delta, Indonesia. The field consists of 555 accumulations and was developed by more than 350 wells with conventional oil recovery methods: natural depletion and peripheral water injection. After many reservoirs have been water-flooded, in order to recover the tertiary oil, EOR lean gas injection project was started in November 1995 on five reservoirs. The project was successful and extended to the other six reservoirs in 2000. However, the field production continued to decline from 200,000 BOPD in the late seventies to 12,500 BOPD in 2003.An integrated study on the largest EOR reservoir was performed to assess the projects' performance, including 3D geo-modeling, reservoir simulation and chemical tracer injection. The study permitted to track the main effects of the gas injection and define reservoir management guidelines for the other lean gas injection reservoirs.In the same time, dynamic synthesis has been performed in all accumulation in Handil Field with objective to identify potential "by-passed" oil and un-drained areas. Following the study, an intensive Light Work Over campaign has been launched and three pilot wells, each with different completion type, have been successfully put on production and became the model for the next Handil development wells; horizontal well equipped by gas lift to recover viscous sandy reservoir in very shallow zone, gravel pack equipped by ESP to recover sandy reservoirs in shallow zone and monobore multi-target well equipped by gas lift to recover reservoirs in main zone.The production has been increased by nearly 100 percents, from 12,500 BOPD in 2003 to 23,000 BOPD nowadays. Integrated reservoir study and the successful application of Light Work Over and Infill Well to recover "by-passed" oil and un-drained areas, supported by EOR techniques to maintain the reservoir pressure and sweep the tertiary oil, become the key elements to revive the mature Handil Field.

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Saka Indonesia's primary objective of drilling an appraisal well offshore North-East Java was to accurately assess productivity of the three main reservoirs discovered by the exploration well drilled in the Pangkah Block. This paper details the integration of advanced formation evaluation procedures and interpretation of image logs with novel formation testing methods, which were used to plan and optimise drill stem tests (DST) conducted across the three reservoirs. Deployed on wireline, formation evaluation and electrical borehole image logs were acquired in open hole of the exploration well. Nuclear magnetic resonance (NMR) and image logs were processed simultaneously in near real time to facilitate the planning of the subsequent formation pressure testing and fluid sampling program. Using the recently introduced advanced formation testing technology, reservoir deliverability was accurately established, in addition to characterising fluids insitu and obtaining reservoir fluid samples. Interpreted results of data acquired on wireline from different logging runs were integrated and consequently used to optimise the well testing program across the intercepted heterogeneous and low permeability limestone reservoirs. In addition to determining porosities, free fluid volumes and the range of permeabilities, Drill Stem Test (DST) zones were confidently defined using the free water levels ascertained by constructed vertical pressure profiles. As a result, DST measurements matched the permeability and productivity estimations across the three pay zones. The integrated approach of formation evaluation, textural analysis and permeability and productivity measurements enabled the evaluation of three complex limestone reservoirs discovered in this field, which included secondary porosities and interconnected vugs. These results were ultimately verified and confirmed by the well tests conducted across the three reservoirs.

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