Slide OilField Geomechanics OilField Geomechanics blue pattern Geomechanics Engineering Consulting, Training and Litigation Support for:
- Oil and Gas Operations
  - Underground Storage
  - Solution Mining
OilField Geomechanics icon Hydraulic Fracturing & Completions Support Litigation / Expert Witness Support Cavern & Solution Mining Geomechanics Geomechanics Training Cap Rock Integrity Evaluations Well & Drilling Geomechanics Underground Storage / CCS Geomechanics 3D Geomechanics Model Development

OilField Geomechanics (OFG) is a woman-owned, industry-leading consulting and training firm. We provide state-of-the-art geomechanics support in a timely and cost-effective manner while honoring our clients’ commitment to safety, health and environmental protection.  OFG was founded in 2014 by Dr. Marisela Sanchez-Nagel and Dr. Neal Nagel, who, combined, have more than 60 years of geomechanics experience.

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OFG can serve as an independent advisor for your company, can serve as part of a project team, or can provide turn-key consulting projects in order to provide the geomechanics expertise you need, when you need it.

When you face difficult geomechanics challenges, whether for conventional or unconventional oil & gas operations, underground storage or solution mining, from exploration to abandonment, or from the wellbore to the field scale, OFG has your back now and into the future.

OFG Oil & Gas Expertise

Oil & Gas Operations

OFG’s expertise in Oil and Gas geomechanics is based upon more than 60 man-years of experience in the industry working on geomechanics projects spanning the globe that have included wellbore stability, hydraulic fracturing, compaction and subsidence, cap rock integrity, sand production, waterflood and water disposal geomechanics and induced (triggered) seismicity.

Salt Cavern Mining

Solution Mining

OFG has worked numerous solution mining projects in the United States and Canada providing geomechanics support for cavern design and operations as well as performing geomechanics modeling of cavern stability/instability. We have also performed geomechanical cavern evaluations in support of permitting and litigation efforts in locations throughout the US.

Expert Witness

Expert Witness

Drs. Sanchez-Nagel and Nagel have provided expert witness support and testimony in numerous litigation and arbitration cases related to geomechanics problems in petroleum and mining engineering (e.g., solution mining, subsidence, hydraulic fracturing and induced seismicity).

OFG Training


OFG provides a wide-range of geomechanics training, both in-person and on-line. We put our passion for geomechanics as well as our career experience into each of our courses, while challenging common engineering practices through geomechanics understanding and fundamentals.

OFG News


  • Neal is serving as member of the Casing Deformation Work Group within the Well Integrity Technical Section of the SPE.
  • Marisela and Neal have been named Adjunct Professors in the Petroleum Engineering Department at the University of North Dakota (UND). We look forward to working with all the great grad students there!
  • Neal has been selected as a member of the SPE Reservoir Technology Development Advisory Committee for a 3-yr term.
  • 2021 and before
  • Neal and Marisela are heading to Grand Forks, ND to present a geomechanics course to the students at UND. Many thanks for the invite! Hmmmmm…..might have to ditch the shorts for this one!
  • Neal and Marisela have completed Unconventional Play Geomechanics training for ConocoPhillips (via Geologica) and an open course (via RPS). Thanks to those who attended and for those who provided very positive and constructive course reviews!
  • Neal made a presentation on geomechanics considerations in Casing Deformations at the bi-monthly ARMA Hydraulic Fracturing Community series.
  • Neal made a two-part presentation on Fracture Driven Interactions (FDI’s) at the NSI Technologies Wed(NSI)day! presentation series on September 22nd and 29th. A replay of these presentations can be found at the NSI website ( Look back later under the OFG download sections for a local version of the presentation.
  • Marisela and Neal will host a 1-day geomechanics course (virtual, across two mornings) for the Rocky Mountains Association of Geologists (RMAG) on the mornings of August 24th & 25th. Please visit to enroll!
  • Neal gave a presentation “Completions-Induced Casing Deformations in Unconventionals: What We Think We Know” at the 2021 URTeC Conference.
  • Neal and Marisela recently presented a two-day course in Geomechanics for Unconventionals during the 9th Geomechanics Symposium in Medellin, Colombia, an ISRM Specialized Conference; a one-day Geomechanics for Unconventionals course in association with 2021 SPE Hydraulic Fracturing Technology Conference (HFTC); and one-day Geomechanics for Unconventionals course in association with 2021 ARMA Conference.
  • Marisela (Director) and Neal (GTS Chair) have retired from the SPE Geomechanics Technical Section after serving the maximum term of three years. Nonetheless, they will continue to support GTS programs and efforts going forward.
  • Marisela has been awarded as 2020 SPE Distinguished member she is also part of the Board of the ARMA Foundation.
  • Neal is co-chair of the SPE Summit on Casing Deformation in Unconventionals, during HFTC 2021.
  • Neal is the Chairman of the SPE Geomechanics Technical Section, Marisela is a Director.
  • Neal and Marisela will teach a two-day course in Geomechanics for Unconventionals during the 9th Geomechanics Symposium in Medellin, Colombia, a ISRM Specialized Conference, May 3-4, 2021.
  • We taught Unconventional geomechanics on-line training courses during SPE HFTC and URTEC in 2020.
Break your rock again? Better call the Geomechanic - OFG