Results and Conclusions of a Horizontal-drilling Program at South Pass 62 Salt-dome Field
E. P. Mason, M. J. Bastian, R. Detomo, M. N. Hashem, A. J. Hildebrandt, 2003. "Results and Conclusions of a Horizontal-drilling Program at South Pass 62 Salt-dome Field", Horizontal Wells: Focus on the Reservoir, Timothy R. Carr, Erik P. Mason, Charles T. Feazel
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Ahorizontal-well redevelopment drilling program around the flanks of the South Pass 62 salt-dome field resulted in significant successes and costly failures. Successful wells exploited thin, oil-filled shoreface sandstones; partially depleted zones; and massive, sand-filled channels. Failures were those wells that attempted to connect multiple fault blocks and drain low-resistivity/laminated-sandstone reservoirs. This paper reviews the field history; describes the geologic setting, including a summary of significant structural features and producing-sandstone depositional environments; discusses the horizontal-well strategy; and examines successful and unsuccessful wells.
South Pass 62 field lies 50 km (30 mi) east of the Mississippi River delta in 104 m (300 ft) of water. The field was discovered in 1965, developed with 61 directionally drilled wells from three platforms in the late 1960s, redeveloped from 1986 to 1988 with 31 wells from a fourth platform, and redeveloped again from 1994 to the present with horizontal and directionally drilled slim-hole sidetracks. A 3-D seismic-based field study completed in 1994 identified reservoir targets for the horizontal-drilling program.
Nearly 60 stacked, variable pay sandstones combine with steep formation dips and extensive faulting to create a complex field with hundreds of reservoirs. The field lies on the north flank of a mushroom-shaped, south-leaning salt dome that rises from below 8000 m (25,000 ft) to within 200 m (656 ft) of the seafloor. Typical formation structural dips decrease from 70° adjacent to the salt to 10° off structure. Several generations of faults exist, with throws ranging from centimeters to more than 100 m. Approximately 60 Pliocene and Miocene deltaic and turbidite pay sandstones ranging in depth from 1158 to 5791 m (3800 to 19,000 ft) onlap the salt.
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Horizontal Wells: Focus on the Reservoir
This book provides an overview of the new technical approaches required for best use of horizontal and extended-reach technology in different reservoir situations. The volume is a selection from more than 50 papers presented at an AAPG/SPWLA Hedberg Research Symposium, “International Horizontal and Extended Reach Well Symposium: Focus on the Reservoir,” held in The Woodlands, Texas, on October 10 14, 1999. The 16 chapters describe horizontal and extended-reach wells and drilling programs in a variety of geologic settings all over the world.