training specialists to the upstream oil and gas industry

Leon Massaras

Leon Massaras Esanda TrainingLeon Massaras has more than 25 years' experience in all types of oil and gas development projects worldwide. He has a Bachelor’s degree in Civil Engineering from the University of Massachusetts, Amherst, MA, USA.

He is an international authority on hydraulic fracturing of conventional and unconventional reservoirs, with all types of placement techniques (Tubing, CTU, Jetting). He has developed innovative analysis techniques: Enhanced Fracture Entry Friction Analysis, Median Ratio, Inverse Slope, and Screenout Index.

Leon is also highly experienced in many other types of well services: Well Cementing, Completions, Formation Damage Remediation, Sandstone Matrix Acidizing, Sand Control, Perforating, Jetting Applications, Acidizing, Nitrogen, CTU, Log Analysis, Production Prediction, Well Testing and Analysis, Wellbore cleanout, Wellbore Repairs, etc.

He has worked in all geological and geographical environments throughout the world: USA, The Netherlands, Italy, United Kingdom, Greece, Egypt, Angola, Germany, Russia, Kazakhstan, Oman, Kuwait, Turkey, Pakistan, Saudi Arabia, Poland, India, and Ukraine.

During his long career, Leon has worked for Halliburton, Resources Engineering Systems (RES), SLB NExT, Synergy, Pangea, and Stratagen, and in positions of increasing responsibility: Field Engineer, Technical Professional, Sr. Technical Professional, Technical Professional Leader, Senior Technical Consultant, Senior Instructor, and Sr. Field Advisor.

Leon is a member of SPE. He has written several papers related to Hydraulic Fracturing of conventional and unconventional reservoirs, and has been an invited speaker at SPE and other conferences.


  • OMC Unconv2_03A (Offshore Mediterranean Conference) “Stimulation Tuning: A Technique for Shortening the Learning Curve of Developing Source Rock Reservoirs”.
  • SPE 159340, “New Coiled-Tubing-Deployed Multizone Hydraulic Fracturing: An Unconventional Process for Unconventional Reservoirs”, (co-author).
  • SPE 157613, "Highly Accurate Prediction of Screenouts in the Eagle Ford Shale with the Screenout Index".
  • SPE 150263, “Real-time Advanced Warning of Screenouts with the Inverse Slope Method”.
  • SPE 149092, “The Median Ratio and Near Wellbore Friction: Useful Proppant Admittance Criteria for Design and Placement of Safe and Effective Propped Hydraulic Fracture Treatments”.
  • SPE 106058, “Enhanced Fracture Entry Friction Analysis of the Rate Step-down Test”.
  • SPE 28565, “Major New Developments in Hydraulic Fracturing with Documented Reduction in Job Costs and Increases in Normalized Production” (co-author).
  • StimTech2008,“Fracture Entry Friction and Fracture Tip Dilatancy: Major Advances on the Design, Placement and Analysis of Propped Hydrofrac Treatments”.

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