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- W2089367037 abstract "Abstract Stag oilfield commenced production in May of 1998 and reached peak rates in excess of 30,000 barrels of oil per day in July 2000. Stag development is an $A200 million oil development on the Northwest Shelf of Western Australia (Fig 1) designed to produce in excess of 50 million barrels of oil over the life of the field. The field was discovered in mid-1993, delineated in 1994 to 1996, and tested with a horizontal well production test in 1996. The development consists of a Central Production Facility containing wells and processing equipment, a 2km subsea line to a CALM buoy and FSO storage and export tanker. Designed to have five producers and three water injectors producing around 30,000bopd oil, the field did not meet initial expectations. Gas-oil ratios were higher than forecast, peaking in excess of 1000scf/bbl and causing significant operating problems for the process plant and electrical submersible pumps. Oil production was lower in the east of the field than anticipated, due to the thinning or absence of high productivity sand units, reservoir pressure support was poorer than modelled leading to more rapid pressure decline than anticipated, and one well produced significant quantities of sand and clayey solids. These challenges led to a significant re-work of the development. Subsea water injectors were added, wells were recompleted in better quality reservoir, pump designs were significantly changed, the reservoir model was rebuilt and more producers were added (Fig 2). At year-end 1999, Stag came of age - production reached design basis levels, reliability approached 100% and overall reservoir performance met expectations. The paper reviews three key elements of the development - Reservoir Description and Performance, Completion Design and, Facility Design and Performance - and presents the lessons learned." @default.
- W2089367037 created "2016-06-24" @default.
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- W2089367037 date "2000-10-16" @default.
- W2089367037 modified "2023-09-30" @default.
- W2089367037 title "Stag Development - Challenges and Successes in the First Two Years" @default.
- W2089367037 doi "https://doi.org/10.2118/64439-ms" @default.
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