18 July 2017

Drilling rig

See rig.
18 July 2017

Drilling spool

A connection component with ends either flanged or hubbed. It must have an internal diam at least equal to the bore of the blowout preventer and […]
18 July 2017

Drilling under pressure

Carrying on drilling operations while maintaining a seal at the top of the wellbore to prevent the well fluids from blowing out.
18 July 2017

Drilling window

(also, “drilling margin”) The drillable pressure profile, bounded on the low side by formation pressure, below which formation fluids will enter the wellbore, and on the […]