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

  • 26-30 November 20185 daysVienna, AustriaCourse Fee: 3300 EUR + VAT

Description

Formation pressure prediction and evaluation is a safety critical task. This course provides you with the fundamental skills required for pre-well prediction and subsequent real-time evaluation of subsurface pressures (overburden, fracture and pore pressures) using a variety of direct and indirect methods. It will also introduce you to the basics of wellbore stability analysis and describe how recognition of the pore pressure generation method is so important for prediction and evaluation.

Course Level: Skill / Advanced
Instructor: Tim Herrett

Designed for you, if you are...

  • A geologist, geophysicist or engineer requiring a fundamental understanding of the principles and applications of pore and fracture pressure in addition to wellbore stability
  • A wellsite or operations geologist wishing to advance your knowledge to an expert level

The course assumes some basic knowledge of operations or wellsite geology and good awareness of drilling operations.

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:

  • The essential concepts of subsurface pressures and stresses and their interrelationships
  • Pore fracture and overburden pressures and how to calculate them
  • The origins of geopressures and how pressure regimes develop through time
  • How geopressures affect the distribution and migration of hydrocarbons
  • The centroid principle and pressure transfer
  • How formation pressures will affect well planning and risk evaluation
  • Subsurface stresses and associated wellbore instability
  • Pore pressure prediction and real-time evaluation using trend analysis
  • Fracture gradient evaluation and interpretation of leak-off tests and FITs
  • How to distinguish causes of wellbore instability
  • How hole conditions, shale caving and gas can be used in evaluations
  • HTHP wells and their special risks and mitigations

Topics

  • What are pore, fracture and overburden pressures?
  • Fundamentals of pressure, definitions and standard equations
  • Subsurface stresses and wellbore stability analysis
  • Borehole breakout identification and analysis
  • Overburden pressures and fracture pressures and how to calculate them
  • The importance of leak-off tests and how to interpret them
  • Role in well planning and casing placement
  • ECD, ESD and other terminology
  • Pore pressure generation mechanisms and controls on distribution
  • Compactional mechanisms
  • Fluid expansion mechanisms
  • Centroid and pressure transfer
  • Influence of structural and diapiric mechanisms
  • Hydrocarbon buoyancy affects and calculating them
  • Influence of generating mechanisms on evaluation
  • Seals, cells and compartments; influence of cells
  • Seal breach and seal capacities
  • Hydrodynamics and tilted hydrocarbon contacts
  • Curve trend analysis methods - background, development and use
  • Influence of mechanism on analysis methods
  • Normal compaction trends
  • Sonic, resistivity, density - advantages and disadvantages
  • Quantitative analysis methods, Ratio, Eaton and Equivalent Depth Methods
  • Predictive methods, seismic methods, basin modelling
  • Analysis methods on offset and analogue well data
  • Combining predictions and managing uncertainty
  • Direct pressure measurements, influxes, wireline and LWD methods
  • Interpretation of LOTs, FITs and typical responses
  • Mud losses, interpretation and management
  • Indirect pressure measurements and their interpretation
  • Drilling indicators, ROP and Dxc
  • Shale characteristics
  • Hole conditions, interpretation of adverse hole conditions
  • Torque and drag, hole fill, cuttings and cavings
  • Evaluation and monitoring techniques, description of cutting and caving styles
  • Identifying mechanisms of wellbore instability and confusion with poor hole cleaning
  • Gas relationships, gas event types and generation
  • Geothermal gradients and temperature
  • Pressure evaluation process review
  • Software used for evaluation
  • Good pressure evaluation practices, post well evaluation and archiving
  • Overview of HTHP wells and their challenges

Customer Feedback

"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." - Head Subsurface Planning at RasGas
"Practical real world examples, well illustrated and very well delivered by a very knowledgable expert" - Consultant Geologist at RPS ENERGY


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