What is Unconfined Compressive Strength?
The unconfined compressive strength (UCS) of sedimentary rocks is a key parameter needed to address a range of geomechanical problems ranging from limiting wellbore instabilities during drilling, to assessing sanding potential and quantitatively constraining stress magnitudes using observations of wellbore failure.
Various applications can be used for the development of rock strength profiles along the wellbore. With testing on core samples, rock strength can be found using rock mechanical laboratory tests. Laboratory tests to find UCS can be done through uniaxial or Triaxial tests. Triaxial tests have to be carried out under different confining stresses to determine the failure criterion of a specific core depth.