Prof. Richard R. Hillis
WHO SHOULD ATTEND
geophysicists, reservoir engineers, exploration supervisors and managers
working with overpressured, naturally fractured or tight gas reservoirs,
or reservoirs that will be subject to fracture stimulation or water-flooding
operations. Explorationists working in areas of active tectonism, or concerned
with seal integrity. Engineers concerned with deviated and horizontal wellbore
2. Basic Rock Mechanics
Stress and strain, stresses and forces, resolving stresses and forces on a plane, Mohr's circle of stress, states of stress, modes of rock deformation
3. Basic Fault Mechanics
Friction, cohesion, Coulomb failure, Mohr failure, Griffith failure, fault/fracture meshes, Andersonian classification of faults
4. Stress in the Crust
Plate tectonics, regional stresses, local stresses, stress rotations, World Stress Map, examples of stress studies from Western Europe/North Sea, Australasia and SE Asia, reference state of stress, tectonic stress.
5. Determining Contemporary Stresses from Oilfield Data
The stress tensor, principal stresses, units (densities, gradients and pressures), overburden stress, borehole breakouts, tensile fractures, vertical and deviated wells, formation integrity, leak-off and hydraulic fracture tests, fracture gradient relations, frictional limits on stress.
6. Pore Pressures
Pore pressure, hydrostatic gradients, overpressure, effective stress, development of overpressure, types of overpressure, pore pressure/stress coupling.
7. Applications of Contemporary Stress Data
horizontal wellbore stability (stable drilling directions and mud weights),
fracture stimulation (problems of stimulation in heterogeneous and overpressured
formations, fracture twisting and the importance of depletion), structural
permeability and natural fluid flow in the sub-surface (dynamically sealing
faults and fracture permeability), EOR planning (injection and production
well positioning), recent tectonic style.