Publications

The West Natuna Gas Project Sales and Supply agreements were completed and signed in January 1999. Three Production Sharing Contractors (PSCs) have the obligation to supply some 2460 Trillion British Thermal Units (TBTU) of gas (on behalf of Pertamina) to SembCorp Gas Ltd. in Singapore over the next twenty-two years. This was the first agreement to export Indonesian gas to foreign markets. The contract first gas start date is 15th July 2001 and the plateau rate Daily Contract Quantity (DCQ) is 341.25 BBTU/d. Block B has a 43.1% share which requires a DCQ plateau rate of approximately 144 MMSCF/d.Within Block B eight fields are dedicated to the Gas Sales Agreement (GSA) contract, and field partners will commence supply of gas from two new field developments, Belida and Tembang. Conoco Indonesia identified a requirement early in the planning and design stages to be able to predict the combined performances of multiple fields in simultaneous production. This required the integration of not only subsurface models, but representation of subsea lines and topsides facilities.A number of combined models were established and most notably an Eclipse simulation model was constructed using the E100 features of Gas Operations and Network modeling. This has proved to be significantly faster to run than other models and provides a more stable solution. Using the Gas Operation module allows specific system related outputs to be generated which are required for appropriate management of the gas fields within the GSA. Further modeling approaches are under investigation to develop the existing techniques. It is anticipated that using Eclipse to predict integrated field performance will become the preferred technique in the short term.