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Abstract: Old Wells, New Concepts and a Fractured Reservoir: The Amoco, Champlin 242D #1, Echo Springs Area, Greater Green River Basin, Wyoming

Randal L. Billingsley, Lesley W. Evans

There is often much benefit to be gained in approaching older wells and productive areas from a different perspective. The Ama Champlin 242D #1 was drilled in 1978 (sect. 11, T19N, R93W, Carbon Cty. WY.) and cored extensively in the Mesaverde Group for a petrophysically oriented formation evaluation. In addition, extensive bottom hole pressure build up (BHPBU) data was acquired to help design and assess completion practices.

A lower Almond Fm. sand zone at 9656^prime MD was cored, perforated and tested extensively prior to and post hydraulic fracture treatment Core analysis data indicates an unstressed, average air permeability of 0.75 millidarcies for the matrix in zone. Attempts to "ballpark estimate" a stressed permeability give a figure of 0.2 millidarcies, and comparison to limited relative permeability data from age equivalent strata supports a further reduction of 1 to 2 orders of magnitude. BHPBU permeabilities from the zone support an in situ effective permeability of 1-2 millidarcies. A swarm of at least 3 natural fractures was observed in the cored interval that was tested. The inconsistency between the matrix and BHPBU data suggests the natural fractures may account for approximately 2 orders f magnitude difference between effective reservoir permeability and matrix permeability alone.

Studies of fracture direction, in situ stress and reservoir impact continue in this aging area of important production.

AAPG Search and Discovery Article #90959©1995 AAPG Rocky Mountain Section Meeting, Reno, Nevada