ABOUT
EXPERT ADVISERS
Multiple years of experience in the field and in the office working a wide range of projects.
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Darren Gollehon, PE
President & CEO
Managing Partner
Darren Gollehon serves as President and CEO of Petroleum Consultants, a company he helped found in 2017. Prior to starting Petroleum Consultants, Darren was a Senior Petroleum Engineer with Ballard Petroleum Holdings in Billings, MT working the Powder River Basin. Darren was a Senior Completions Engineer for Hess Corporation in Minot, ND before relocating back to Montana. He began his post baccalaureate career with Merit Energy Company as an Operations Engineer in Dallas, TX.
Darren has been fortunate enough to work both onshore and offshore including stints with Baker Oil Tools, Unocal and BP America in the Deepwater Gulf of Mexico. He has amassed experience in drilling, completions, production, reservoir, midstream and business development across the Western Gulf, Permian, Anadarko, Fort Worth, Arkoma, Williston, and Powder River Basins.
Darren holds a Bachelor of Science degree in Petroleum Engineering from Montana Tech and a Master’s degree of Business Administration from The University of Montana. He is a registered Professional Engineer.
Doug Rubick, PE
Senior Vice President
Senior Partner
Doug's experience includes supervising all completion operations in the Powder River Basin. Very versed in Frac'ing, WL, Coil and Workover Rig Supervision. He has also served as an in-house consulting engineer for Ballard Petroleum Holdings.
Doug also was a Completions Engineer for Hess Corporation in Minot, ND. He began his career with Chesapeake Energy Company as a Production Engineer in Hobbs, NM. Doug also gained experience in the downstream side while working for Loenbro in the Montana Refining Company. Doug broke out in the oilfield by roughnecking for Ensign Drilling.
Doug holds a Bachelor of Science degree in Petroleum Engineering from Montana Tech. He is a registered Professional Engineer in Montana and North Dakota.
Cody Danielson, PE
Vice President
Partner
Cody’s experience with engineering design and project implementation includes work in drilling, completions, facilities, production, regulatory and reservoir. Results-motivated and process-driven, Cody uses a systematic approach in his project design and implementation to ensure a high-quality work product.
Prior to joining Petroleum Consultants in 2018, Cody served numerous roles in the industry, with a large portion of his career spent with Aera Energy in Ventura, CA as a production/operation engineer. Other work experience includes drilling engineer, heavy oil production supervisor, reservoir engineer, and regulatory compliance engineer.
Cody holds a Bachelor of Science degree in Petroleum Engineering from Montana Tech. He is a registered Professional Engineer in Oklahoma and Wyoming.