PESA WA Short course: Fundamentals of Pore Pressure Prediction and Petroleum Geomechanics (2 days)
Date: Thursday 23rd March & Friday 24th March 2017
Venue : Mantra Hotel, 305 Murray St, Perth WA 6000
$660 – Members
$990 – Non-Members
$132 – Student Members (limited to 4 places) – please email firstname.lastname@example.org to waitlist if sold out
Members need to sign into the website to book with member rates.
Bookings close Monday 20th March 2017 for venue purposes and course material preparation.
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.
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.