Anadarko Petroleum Corporation
ConocoPhillips Canada
Devon Energy Corporation
Husky Energy
Petro-Canada
Penn West (now Obsidian Energy Ltd.)
Suncor
Arcan Resources
Touchdown Land
St. Mary Land & Exploration Company
TransCanada
PetroLMI
Canadian Natural Resources Limited
Calfrac Well Services
Precision Drilling
Velvet Energy
TAQA North
