18 July 2017

Angle of deflection

In directional drilling, the angle, expressed in degrees, at which a well is deflected from the vertical by a whipstock or other deflection tool.
25 July 2017

Annular blowout preventer

A type of BOP that uses a shaped elastomeric sealing element (“packing element”) to seal the space between the tubular and the wellbore or an open […]
18 July 2017

Annular preventer

See Annular blowout preventer.
18 July 2017

Annular space

(also “annulus“) The space surrounding a cylindrical object within a cylinder. The space around a pipe in a wellbore, the other wall of which may be […]