WHAT IS AND WHY GEOMECHANICS?

About the Presenter:

Dr. Manhal Sirat holds a PhD Degree in structural geology from Uppsala University, Sweden. He has +27 years of multidisciplinary experience in industry and academia. Before joining the Oil-Industry, Dr. Sirat worked in Academia for +15 years worldwide including the Petroleum Institute (2004–2008)).

Abstract

Geomechanics and Structural Geology apply solid mechanics, mathematics, and physics to quantify rocks behavior and response (strain or deformation) to the applied regional and in-situ stresses. This discipline represents the bridge between Geology (Static) and Engineering (Dynamic), hence can generally quantify and predict rocks behavior in the subsurface due to change in stress status. Changing the stress-equilibrium within the reservoirs by drilling/ production/ injection activities results in changing in-situ stresses, reservoir pressure hence enhancing strain, where for instance, the pre-existing fractures that represent the direct rocks-fabric brittle response to the applied stresses, can be reactivated.  Subsequently, this would affect well stability during drilling causing for instance, stuck pipes, mud losses and early water-cut. Other indirect effects of stress changes include cap-rock and breach of fault-seal, fractures openness-closeness, reservoirs-compaction by pore collapse, hence possible surface subsidence.  The role and importance of Geomechanics workflow and applications to reservoir lifecycle especially in tight and Unconventional reservoirs have been increasingly recognized worldwide during the past decade, where hydro-fracking for EOR and well placement are critical to increase production.  This is simply because Geomechanical applications can provide solutions to numerous aspects related to E&P, and field development, which ultimately increase reservoir productivity and recovery.  In ADCO AR&D, EUFR and Assets (2011–2015) more than 27 Geomechanics studies have been planned, conducted and completed, which have demonstrated the added value of its wide applications.  Methodology, best practices and most important findings have been transferred within ADCO by more than 30 publications and presentations in local and international conferences and workshops.

In this presentation, basic concepts will be presented during the first part, followed by Geomechanics methodology including building 1D Mechanical Earth Model (MEM), and 3D MEM with their geological assumptions and constrains.  Finally, relevant applications including successful local examples of Geomechanics applications to ADCO’s Assets with their findings and added value will be presented.

Leave a Reply