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Pore Pressure, Fracture Pressure and Wellbore Stability Management (GEO21)


    Starting from the very basics this course describes how we predict, calculate and evaluate overburden, fracture and pore pressures as well as subsurface stresses and how they are related. Theories of how overpressures are generated will be discussed, how these pressures are subsequently modified and how they impact on hydrocarbon generation and migration, well planning and risk identification as well as evaluation techniques.

    Please note:
    This course discusses wellbore instability, its origins and how to identify it, but it is not a geomechanics course.

    Course Level: Skill / Advanced
    Duration: 5 days
    Instructor: Tim Herrett

    Designed for you, if you are...

    • A wellsite or operations geologist, drilling engineer or subsurface geologist/geophysicist

    This course assumes little or no prior knowledge of formation pressures, but will require an understanding of geology, drilling activities and associated terminologies.

    How we build your confidence

    You will be taken along a path which gradually introduces each topic and uses many exercises and case studies to illustrate the points made. The manual provides a good future reference for what has been taught on the course.

    The benefits from attending

    By the end of the course you will feel confident in your understanding of:

    • Basics of subsurface pressures and stresses and their interrelationships
    • Overburden pressures
    • Fracture pressure calculation and measurement using leak-off tests
    • Leak-off tests, FITs and XLOTs and their interpretation
    • Earth stresses and how they can cause wellbore instability
    • How overpressures develop and change through time
    • The centroid concept and pressure transfer
    • Impact of formation pressures on well planning and risk management
    • Pore pressure prediction and real-time evaluation using trend analysis
    • Identification of wellbore instability mechanisms
    • Use of indicators such as hole conditions, shale caving and gas in pressure evaluations
    • Pressure evaluation in non-clastic environments (carbonates/evaporates etc.)


    • Basics of Wellsite Pressure Evaluation
      - Overview
      - Formation pressure fundamentals
      - Stress definitions
      - Overburden pressures and gradients
      - Fracture pressures and gradients
      - Plotting formation pressures
      - More terminology
    • Abnormal Pressure Mechanisms
      - Classification basis
      - Abnormal pressure mechanisms
      - Compaction mechanisms
      - Fluid expansion mechanisms
      - Pressure charging / structural
      - Mechanism and evaluation
      - Seals, cells and compartments
      - Hydrodynamics
    • Formation Pressure Evaluation
    • PART 1: Curve Trend Line Analysis Methods and Pre-Well Prediction
      - Quantitative analysis methods
      - Curve trend analysis - well data
      - Predictive methods
    • PART 2: Direct Pressure Measurements
      - Direct pressure measurements
      - Fracture pressure measurements
    • PART 3: Indirect Pressure Indicators
      - Indirect pressure indicators
      - Drilling indicators
      - Shale characteristics
      - Hole conditions
      - Cuttings and cavings
      - Gas relationships
      - Geothermal gradient and temperature
      - Formation pressure prediction and evaluation in non-clastics
    • PART 4: Other Support Tools and Evaluation Process
      - Other support tools
      - Evaluation process
      - Good practices
      - Post well evaluation

    Customer Feedback

    "Good quantity of case studies, very practical course, theoretical part not excessive!" - Operations Geologist at Wintershall

    "The course is very practical and applicable to real well planning processes." - Petrophysicist at INA

    "I liked the practical approach of the instructor and his professional level. Very good manual." - Wellsite Geologist at MOL

    "All the material has been collected and prepared from real wells. The exercises we did were not just a setup of questions, they were from real experience of Mr. Tim." - Drilling Supervisor at Dragon Oil

    "World class instructor, well-explained presentations and great course material." - Geophysicist at OMV

    "One of the best courses I have attended, very good organisation, great instructor." - Petrophysicist at Wintershall

    "Very good quality presentation material, Tim has definitely worked hard to make the graphs and cartoons simple, clear and appealing." - Sr. Engineer at RasGas

    "Practical real world examples, well illustrated and very well delivered by a very knowledgeable expert" - Geologist at RPS ENERGY



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