| Title | LOGGING SURVEILLANCE OPTIMIZATION FOR EFFECTIVE MONITORING AND COST EFFICIENCY IN SALAK GEOTHERMAL FIELD, INDONESIA |
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| Authors | A.H. Dawud, A.U. Anandya, F.L. Titoes, T. Julinawati, R.P. Prameswari, G.G. Umali |
| Year | 2018 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | Surveillance, optimization, logging, geochemistry, downhole sampling |
| Abstract | The Salak Reservoir Surveillance Plan is developed annually to implement a comprehensive and efficient reservoir monitoring program that proactively addresses both positive and negative field performance developments for maintaining optimum field production and injection capacities. The Surveillance Plan consists of monitoring programs for daily well data gathering, downhole data acquisition, geochemistry sampling, and geophysics. Downhole data acquisition through logging wireline operation is one of the most important surveillance programs for well evaluation and characterization. Well logging operation spends the highest cost among the other surveillance programs due to the special tools and technologies used to get accurate and representative downhole data. Historically, the cost of downhole data acquisition was about 85% of the total Annual Salak Surveillance Plan. An optimization of the wireline logging surveillance was conducted at Salak Field to effectively obtain the critical downhole data required to maintain optimum well production and injection capacities. The optimization included development of a new workflow, logging surveillance guideline, and a logging selection matrix. Implementation of the optimized wireline logging surveillance plan in 2017 reduced wireline logging surveillance cost by about 40% from previous years. Although the logging surveillance cost was reduced, downhole data quality was maintained for timely well and reservoir characterization. |