British Petroleum America Inc.
http://www.bp.com

ConocoPhillips Inc
www.conocophillips.com

Chevron
www.chevron.com

Delta Petroleum Corporation
www.deltapetro.com

Devon Energy Corporation
www.devonenergy.com

Dominion Exploration & Production Inc.
www.dom.com

Double Eagle Petroleum Co.
www.dble.us

Duke Energy Field Services
www.defieldservices.com/

El Paso Corporation
www.elpaso.com

EnCana Oil & Gas (USA) Inc
www.encana.com

EOG Resources Inc
www.eogresources.com

Exxon Mobil Corporation
www.exxonmobil.com

Fidelity Exploration & Production Company www.fidelityepco.com

Forest Oil Corporation www.forestoil.com

 Halliburton Energy Services www.halliburton.com

 J.M. Huber Corporation www.huber.com

 JW Operating Company www.jwoperating.com

 Key Energy Services Inc.
www.keyenergy.com

KPMG International
www.kpmg.com

Marathon Oil Company
www.marathon.com

Merit Energy Company
www.meritenergy.com

Nabors Drilling USA, LLP
www.nabors.com

Noble Energy Inc.
www.nobleenergyinc.com

Occidental Petroleum Corporation
www.oxy.com

Petrie Parkman & Co.
www.petrieparkman.com

Petro-Canada
www.petro-canada.com

Pioneer Natural Resources Company
www.pioneernrc.com

Questar Corporation
www.questar.com

Robert L. Bayless, Producer LLC
www.rlbayless.com/

Rocky Mountain Oil and Gas Training Center www.rockymountaindrilling.org

Samson Investment Company www.samson.com

Schlumberger Limited www.slb.com/

Shell Oil Company www.shell.com

St. Mary Land and Exploration Company www.stmaryland.com

The Williams Companies Inc.
www.williams.com

True Oil LLC
www.truecos.com

Ultra Petroleum Corporation
www.ultrapetroleum.com/

Whiting Petroleum Corporation
www.whiting.com

Xto Energy Inc.
www.xtoenergy.com