--> ABSTRACT: Team Approach Enables Miscible Flood from Inception: Brassey, Canada, by Denise Woofter, Howard Anderson; #91003 (1990).
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ABSTRACT: Team Approach Enables Miscible Previous HitFloodNext Hit from Inception: Brassey, Canada

Denise Woofter, Howard Anderson

The Brassey field was discovered in northeast British Columbia, Canada, by Canadian Hunter Exploration, Ltd., in a 1987 joint venture with BP Exploration Inc. Oil is produced from the Artex member of the Triassic Charlie Lake Formation at a depth of 9850 ft. The oil is a 57° API, volatile, undersaturated fluid stratigraphically trapped in a 10-ft-thick overpressured eolian sandstone, considered to be part of a larger coastal dune complex. Water saturation in this oil-wet reservoir has been determined to be 1%, with an average porosity of 17% and permeability of 137 md. The majority of the 19 successful wells drilled to date are capable of production rates greater than 2000 BOPD.

Brassey was an ideal candidate for a pattern miscible Previous HitfloodNext Hit because the thinness, homogeneity, and flat orientation of the reservoir was combined with a low-viscosity oil. Economics indicated that the usual primary and secondary production phases could be bypassed and a hydrocarbon miscible Previous HitfloodNext Hit implemented from inception.

An aggressive team approach was a significant factor in commencing production and injection by August 1989. Seismic, including a vertical seismic profile, was used extensively in the development drilling stage. Well-test analysis confirmed five separate pools and, together with reservoir volumetrics, was used to define oil in place. Laboratory work and reservoir simulation indicated a miscible recovery of approximately 70%.

Successful development of the miscible Previous HitfloodTop would not have been possible without an integrated geological-geophysical-engineering model, which provided the confidence necessary to drill development wells on the pool edge.

AAPG Search and Discovery Article #91003©1990 AAPG Annual Convention, San Francisco, California, June 3-6, 1990