Vortex Induced Vibration (VIV)
10 November 2021
Emergency Shutdown (ESD)
10 November 2021

Underbalanced Operations (UBO)

Drilling operations employing used in drilling oil and gas wells with appropriate equipment and controls where the pressure exerted in the wellbore is intentionally less than the static pore pressure in any part of the exposed formations being drilled.

The purpose of the UBO technique is to bring formation fluids to the surface.