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Geomechanics And Borehole Stability, Fault Seal Integrity for Oil And Gas


January 28 - February 1, 2019

Instructor : Dr. Scott Mildren


Geologists, Geophysicists, Petrophysicists, Reservoir and Production Engineers, Supervisors.


This course introduces attendees to the fundamental concepts underpinning any geomechanical study such as rock properties, the relationship between stress and strain, sources of stress and the components of a full stress tensor. Techniques for estimating rock properties and the stress components are presented with related data requirements. Geomechanical implications for the petroleum industry are discussed and methods for assessing geomechanical risks of wellbore instability, fault seal integrity and sand production are addressed. The course is designed for anyone involved in petroleum related exploration or well planning without detailed geomechanical experience.


  • What is geomechanics?
  • Stress, strain and failure
  • Why should you care about geomechanics?

Stress and Strains
  • The relationship between stress and strain
  • Elastic vs brittle vs plastic deformation
  • The principal stress magnitudes
  • Shear stress and normal stress
  • Stress tensor
  • Plate boundary forces
  • Effect of local structure

The in situ Stress Tensor
  • Reference states
  • Vertical stress
  • Maximum horizontal stress
  • Minimum horizontal stress
  • Andersonian classification
  • Pore pressure stress coupling
  • Rock Properties and Failure Envelopes
  • Visualising stress tensors with Mohr Diagrams

Determining Rock Mechanical Properties from Petroleum Data
  • Elastic properties
  • Rock strength

Stress determination from Petroleum Data
  • Data QC
  • Vertical Stress Magnitude
  • Stresses around a wellbore
  • Horizontal Stress Orientation
      o Interpreting Image log and calliper data
  • Minimum horizontal stress magnitude
    • o Hydraulic fracture tests theory and description
  • Maximum horizontal stress magnitude
    • o Breakout Occurrence and rock strength
    • o Drilling induced tensile fracture occurrence and rock strength
    • o Frictional Limits
    • o Breakout Width
  • Stresses around Arbitrarily Inclined Wellbores
  • Wireline Stress Estimates (1D geomechanical models)
      o Rock Physics
      o Geological Environment

Petroleum Applications
  • Well Planning
  • Predictive Wellbore Stability
      o Generic WBS
    • o Trajectory WBS
    • o Drilling Optimization
  • Structural Permeability
      o Fault Seal Analysis
    • o Fracture Permeability
  • Sanding
  • Implications for Fracture Stimulation


First day will be held at Holiday Inn (Sofitel Hotel), in Cairo. The participants will fly the next day to Hurghada. The course will be continued in Hurghada.


The cost is inclusive of course manual, guidebook, accommodation in Hurghada and air ticket to/from Hurghada.


Dr Scott Mildren, Geomechanics Director of Ikon Science UK, Ph.D., University of Adelaide, Australia. A geologist spent time with Z & S (Asia) Ltd (now Baker Atlas Geoscience) performing stress structural and sedimentological interpretation of resistivity and acoustic image log data. Scott was also among the academic staff at the Australian School of Petroleum and the National Centre for Petroleum Geology and Geophysics researching various geomechanical issues such as fault and cap rock seal integrity, fractured reservoirs, wellbore stability and trap risk.

Key Technical Experience
  • Geomechanics
  • Image interpretation
  • Fault seal
  • Fracture permeability

Work Experience
Managing JRS Petroleum Research Pty Ltd (now Ikon Geomechanics), Australia
Selected Projects
  • Fault Seal Evaluation, Ca Rong Do, Vietnam.
  • Wellbore Stability and Fracture Susceptibility, Mangatoa, New Zealand
  • Fault Seal Reactivation Regional Study, Bass Basin, Australia
  • Post Mortem Seal Evaluation, SB305, Sulu Sea, Malaysia
  • Geomechanical evaluation of the Epenarra structure and environs with application to fracture susceptibility of the Darwin Formation/Bathurst Radiolarite
  • Regional seal evaluation of the Northern Taranaki Graben
  • Regional fault reactivation mapping of the Bonaparte Basin
  • Fault Reactivation mapping of the Wackett Southeast Fault
  • The contemporary stress field in the Timor Sea and implications for dynamic fault trap integrity: an assessment.