About

Reputation / Expertise / Service

About NSAI

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Netherland, Sewell & Associates, Inc. (NSAI) is a worldwide leader of petroleum property analysis to industry and financial organizations and government agencies. We deliver high quality, fully integrated engineering, operational, geological, geophysical, petrophysical, and economic solutions for all facets of the upstream energy industry.

  • Established in 1961
  • Offices in Dallas and Houston, Texas
  • 60+ Engineers, Geologists, Geophysicists, and Petrophysicists
  • 75+ Engineering and Geology Analysts
  • Expertise in most producing basins worldwide
  • Well known within the oil & gas and financial communities
  • Chosen by more companies for their SEC reserves reporting than any other petroleum consulting firm
  • Focused on building client relationships and delivering exceptional service
Click below to learn more about our history and our current team.
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    The History of NSAI
    reliability / dedication / integrity

    In 1961 Clarence Netherland started his own petroleum consulting firm, and decided from the outset that it would be the top organization of its kind in the world. He handpicked each employee with the right combination of experience, technical skills, and professional judgment.

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    The Experts at NSAI
    knowledge / skill / experience

    NSAI specializes in projects encompassing multiple disciplines. Our technical staff includes reservoir and operations engineers, petrophysicists, and geoscientists who are generally cross-trained in geology and geophysics. We also employ staff specializing in geologic modeling, reservoir simulations, complex computer mapping, and non-routine time-to-depth conversion.

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