Darien G. O'Brien, P.E., Mba Email & Phone Number

Lakewood, Colorado

Denver-Julesburg Basin, Piceance Basin, Raton Basin, San Luis Basin, Paradox Basin, North Park Basin, San Juan Basin, Williston Basin, Permian Basin, Powder River Basin, Appalachian Basin and Deepwater West Africa Drilling, Reservoir and Production Operations Engineering.• Field supervision for drilling and completion operations in Colorado, Wyoming, Utah, Texas and North Dakota. Designed, planned and implemented horizontal well drilling and multi-stage completions.• Oversight, guidance and quality control relating to leasing, surface use agreements, permitting and compliance.• Expert witness testimony for Oil and Gas Commission Hearings on spacing, unitization and reservoir management.• Cameia Angola Block 21 Deepwater West Africa – provided reservoir simulation for sanctioning.• Rate Transient Analysis (RTA) on Mancos Shale wells to determine optimum drilling spacing.• Permian Basin - (SACROC Field) Enhanced Oil Recovery (EOR). Designed, planned and implemented the first horizontal well drilled and completed in the SACROC field.• Contributing Author: “Marcellus Fracture Characterization Using P-Wave Azimuthal Velocity Attributes: Comparison with Production and Outcrop Data,” SPE #1922505, 2014, published in Interpretation Journal, August, 2015, Vol. 3, No. 3, pp. SU1-SU15.• Principal Author: "Using Real-Time Downhole Microseismic to Evaluate Fracture Geometry for Horizontal Packer-Sleeve Completions in the Bakken Formation, Elm Coulee Field, Montana," SPE #139774, 2011, published in SPE Production & Operations, Volume 27 No. 1, February, 2012.

Denver, Colorado

Montana (Elm Coulee Field) and North Dakota (Fort Berthold) Bakken reservoir horizontal well exploitation and miscible gas flooding Enhanced Oil Recovery Project Manager.

Demver, Colorado

Provide economic and technical assessments of exploration and exploitation opportunities in the Rockies, Permian Basin, Mid-Continent, California and Gulf of Mexico including tight-gas vertical and deviated drilling, workover and remediation treatments, infill drilling and exploring behind-pipe potential.

Denver, Colorado

Provide the corporate SEC reserves using ARIES and PowerTools with strict adherence to Sarbanes-Oxley tests of key controls for internal and external auditors.

Lakewood, Colorado

Tight-gas vertical and deviated drilling, workover and remediation treatments, SEC reporting, infill drilling, refinery operations, governmental and environmental compliance, acquisitions and economics, exploring behind-pipe potential in the Rocky Mountain and Appalachian Mountain regions.

Anchorage, Alaska

Provided technical and economic justification, including coordinating internal company approvals and liaison with Working Interest Owners for new Prudhoe Bay Unit Western Operating Area facilities as a member of the shared services organization working with engineers, geologists, geophysicists and technicians from both BP Exploration Inc. and ARCO Alaska, Inc.

Bachelor Of Science (Bs), Petroleum Engineering

Master Of Business Administration (Mba)

Information Technology Certificate, College Of Engineering & Applied Science