Formation Pressure (Pore Pressure)
Pressure exerted by fluids within the pores of the formation (see Pore Pressure).
Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards
The pressure at the bottom of a well when shut-in at the wellhead.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards