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ABSTRACT: Widuri Field: Economic philosophy and technology affect the development of a giant oil field through the 1990s

Thomas, Budiyento, Susandhi Ridwan, G.P. Putra, Mark Schneider, M. Greg Smith, John Armon , YPF Maxus Southeast Sumatra B.V, Jakarta Selatan, Indonesia

Widuri Field, Asri Basin, was discovered in 1988 and delineated initially with 5 additional wells. Close spaced seismic was shot and the initial POD was submitted within the first 6 months, calling for five platforms and 50 wells on unrisked reserves of 225 MMBO. Three additional delineation wells led to some reserve additions and the fifth platform being moved southwards. Current cumulative production has exceeded the original reserve estimates (November 1999), with the number of productive wells more than doubled. The "learning curve" has been considerable through the 1990s, both in terms of reservoirs, production and technology, and the question arises as to what might be done differently if the field was to be developed now - utilizing 3D seismic and horizontal wells from the outset. The key drawbacks to a more aggressive early development than that undertaken are the number of wells and time required to understand the seismic attributes that serve to map out the main reservoir bodies. Other aspects of the development are more predictable - water handling facilities, oil tanker storage and power requirements. With some assumptions it has been possible to develop an alternative development scenario for comparison with the actual data. The major uncertainty in doing this surrounds the degree of success in optimizing horizontal well locations during the early development process, assuming that the sandbodies are poorly understood and delineated due to the limited knowledge base at the outset.

AAPG Search and Discovery Article #90913©2000 AAPG International Conference and Exhibition, Bali, Indonesia