Subsurface stress plays a major role in controlling wellbore
stability, fracture permeability and aperture. Subsurface stress determination
or in-situ stress determination play a vital role in the exploitation for
existing reservoirs and in the definition of fractured reservoirs. Field
and laboratory techniques to measure and detect the natural stress field
will be discussed. These include shear wave analysis for fracture orientation,
Anelastic Strain Relaxation (ASR), Circumferential Velocity Analysis (CVA),
Differential Strain Analysis (DSA), minifracing, hydraulic fracturing,
borehole break outs, borehole ellipticity, dipole logging responses, etc.
Topics to be covered
1) States of stress in various tectonic and geological environments
2) Connection between stress and rock failure
3) The role of stress in modulating fractures
4) Laboratory techniques of measuring in-situ stresses
5) Field techniques for detecting stresses.
6) Stress dependent permeability