Alberta Oilsands Inc
Athabasca Oil Corporation
Baytex Energy
BP
Canadian Natural Resources Ltd.
Canadian Oil Sands Ltd.
Cenovus Energy Inc.
Chevron
ConocoPhillips
Deloro Resources Ltd.
Devon Energy Corporation
Earth Energy Resources Inc.
E-T Energy
ExxonMobil Corporation
GreenRiver Resources
Habanero Resources
Husky Energy Inc.
Imperial Oil Ltd.
Ivanhoe Energy Inc.
Koch Oil Sands Operating ULC
Korea National Oil Corp. (KNOC)
Laricina Energy Ltd.
Legacy Oil & Gas
MEG Energy Ltd.
Mocal Energy Ltd.
Mullen Group Ltd.
Murphy Oil Corporation
North American Energy Partners Inc.
North West Upgrading Inc.
Occidental Petroleum Corporation
Opti Canada Inc.
OSUM Oil Sands Corporation
Pan Orient Energy Corporation
Pengrowth Energy
Penn West Exploration
Perpetual Energy Inc.
Petrobank Energy & Resources Inc.
Petrobras
Petro-Canada
ProSep Inc.
Saipem SpA
Sinopec Corporation
Talisman Energy Inc.
Tesoro Corporation
Titanium Corporation Inc.
URS Flint Energy Services Ltd.
UTS Energy Corporation
Value Creation, Inc.
Willbros Group, Inc.