PET E 520: Energy Rock Engineering
PET E 366
Course Contents
An Introduction to energy geomechanics (1 session)
- Elements of Rock Mechanics
- Stress tensor, strain tensor, stress-strain relationship, pore pressure, effective stress,
- Equilibrium equation (2 sessions)
- Rock stiffness, tensile and shear strength (1 session)
- Mechanical properties from laboratory testing, core representativeness and influence of sample size, core alteration, core handling, sample preparation, tensile tests, UCS, triaxial test, hydrostatic test, TWC test, strength profiling, fracture toughness test (1 session)
- Rock properties from wireline logs and geophysical exploration, elastic modulus, Poisson’s ratio, UCS, strength estimation from physical properties (1 session)
Stress with constant and variable pore pressure around boreholes (2 sessions)
In-situ stress regimes, overburden stress, min and max horizontal stress, pore pressure (2 sessions)
In situ stress assessment (2 sessions)
- Overburden stress calculation
- Minimum horizontal stress assessment from DFIT
- G-function method
- Pressure derivative and square root method
- After closure analysis
- Maximum horizontal stress determination
- In-situ stress directions
- Pore pressure assessment
Hydraulic fracturing
- Fracture geometry (1 session)
- Fracture modes
- Fracture initiation and formation breakdown
- Fracture orientation, growth and confinement
- Fracture length and height; PKN and KGD models
- Stiffness, permeability, and thermal effects on fracturing pressure and propagation
- Microseismic map as a measure of fracture growth
- Rock fracability (1 session)
- Brittleness Index
- Fracability Index
- Perforation for Hydraulic Fracturing (1 session)
- Perforation direction, diameter and phasing
- Promoting transverse fracture
- Stress shadow in multi-stage fracturing (1 session)
- Geothermal fracture engineering (1 session)
Wellbore stability during drilling (2 sessions)
- Borehole failure criteria
- Borehole breakouts
- Stability of vertical and slanted wells
- Lost circulation
- Mud window
- Interaction between shale and drilling fluid
Sand production (2 sessions)
- Forces on sand grains
- Sandstone failure
- Critical drawdown for the onset of sanding
- Sanding rate assessment
- Sand transport
- Sand control
Reservoir Geomechanics (1 session)
- Changes in stress in and around the reservoir
- Changes in porosity and permeability
- Surface subsidence and heave
- Fault reactivation
Caprock Integrity mechanisms (1 session)
- Integrity of SAGD caprock
- Integrity of caprock during and after CO2 injection
Wellbore integrity mechanisms, completion integrity, casing and cement sheath integrity, fault reactivation, integrity of older wells, case studies (1 session)