The PESA Distinguished Lecturer Tour
Dr Mark Tingay
PESA NSW Short course: “Fundamentals of Pore Pressure Prediction and Petroleum Geomechanics”
Date: Monday 13th & Tuesday 14th March 2017
The safe drilling of wells requires detailed pre-drill prediction of pore pressures, fracture gradients and potential wellbore instability. Accurate pore pressure and fracture gradient prediction is vital for several aspects of well planning, such as casing and cementing design, as well as the prevention of potentially disastrous kicks, losses and blowouts. Furthermore, wellbore instability and associated events, such as pack-offs and stuck pipe, are regarded as the largest cause of non-productive time in deep-water drilling operations. Thus, wellbore stability, pore pressure and fracture gradient analysis represents a key part in reducing drilling costs and optimizing drilling, both in the planning and operational stages of drilling a well. Finally, knowledge of petroleum geomechanics is particularly important in enhancing production in naturally fractured reservoirs and coals, as well as for hydraulic fracture stimulation, and thus is highly valuable in unconventional reservoirs. Knowledge of petroleum geomechanics and pore pressure prediction techniques is particularly important in Australia and SE Asia, which is often characterized by complicated geology, variable and often high-magnitude stress states and anomalous overpressures.
Dr Tingay will present a two-day intensive course on the fundamentals of pore pressure prediction and petroleum geomechanics, with a particular focus on examples and applications in Australia and SE Asia. This course will cover the fundamentals of pore pressure measurement, overpressure generation, overpressure analysis, and pore pressure prediction in order to provide attendees with an understanding of the core components of pore pressure prediction in the region. The course will then examine the basics of wellbore geomechanics, including stress, strain and rock failure, stress determination for petroleum data, prediction of fracture gradient and wellbore collapse pressures from log data and the application of geomechanics in the oil-patch.
PESA Members: $550 for two days or $350 for one day (Please log in to see member prices)
Non-members: $650 for two days or $450 for one day
PESA Students Members: $250 for two days or $150 for one day
Bookings close Wednesday 8th March 2017 or until sold out.
Castlereagh Boutique Hotel, 169 Castlereagh St, Sydney, NSW
9 am – 5 pm, Monday 13th & Tuesday 14th March 2017
Day 1: Fundamentals of Overpressure and Pore Pressure Prediction
Introduction to pore pressure
Definitions of pore pressure and overpressure.
Where overpressure is found.
Geological expressions of overpressure.
General importance of overpressure and pore pressure prediction.
Measuring pore pressure
Wireline logging measurements.
Drilling based measurements.
The ‘sand/shale’ dilemma in overpressure analysis.
Overpressure Generation Mechanisms
Effective stress mechanisms (disequilibrium compaction, tectonic loading).
Fluid expansion mechanisms (e.g. kerogen to gas maturation, clay diagenesis).
Determining overpressure generation mechanisms
Worked examples from Thailand and Brunei
Introduction to Pore Pressure Prediction
Basic prediction concepts.
Common pore pressure prediction methods (e.g. Eaton, Bowers, Equivalent Depth).
Log-based pore pressure prediction examples
Review of seismic velocities for pre-drill prediction
Drilling-based PPP (D-exponent, gases, cuttings analysis, kick detection)
Integrating and updating pre-drill and real-time predictions.
Importance of post-drilling reflection and review.
Day 2: Fundamentals of Petroleum Geomechanics
Basics of Stress, Strain and Rock Mechanics
Introduction to rock mechanics and petroleum geomechanics.
Stress, strain and resolving stresses in the Earth.
Brittle failure and basic fault mechanics.
Stress Around Wellbores
Stress around vertical wellbores.
Breakouts, drilling-induced fractures and wellbore instability
Stress patterns in the Earth from plate to reservoir scale.
Vertical Stress and Fracture Gradient
Overview and importance of overburden and fracture gradient.
Overburden gradient calculation.
Measurements of minimum stress and fracture gradient from drilling tests.
Fracture gradient prediction by the effective stress ratio.
Poroelastic fracture gradient prediction from wireline log data.
Wellbore stability and other Petroleum Geomechanics Applications
Overview of wellbore stability analysis.
Basics of estimating the maximum horizontal stress magnitude.
Stress around deviated wellbores.
Calculation of collapse pressures.
Summary of geomechanical applications for fractured reservoir production, fault seal breach and hydraulic fracture stimulation.