Geosteering techniques avoid production completions

A combination of innovative geosteering techniques, aided by state-of-the-art logging-while-drilling (LWD) technologies, allowed Mobil E&P Australia to remain within a narrow 2-m band while avoiding existing wellbores.The 1997 project described in this article consists of the full-field development phase for the 75-million bbl Wandoo heavy oil field, located 50 km offshore Northwest Australia.GeologyThe low relief reservoir consists of two main unconsolidated units. The upper Unit A is a fine-grained greensand with permeability ranging from 50 to 3,000 md. This unit contains up to 50% glauconite with laterally continuous, hard siderite bands.Reservoir quality improves with depth, becoming...

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