Poroelastic theory: Hooke's law for dry rock, porous rock or non-porous rock, Biot's and Skepton's Coefficient. Borehole stability: Effect of mud weight on well stability, Rupture modes around a borehole. Sand production prediction: Sand production mechanisms, Theories to predict sanding tendencies. Hydraulic fracture design: Theory and calculation of hydraulic fracture.  Concepts of fracture and its measurements. Fracture orientation & azimuth, Fracture area, Numerical modeling. Reservoir engineering applications: Depletion and effective stress, Compaction drive, Reservoir compaction and compressibility, Subsidence