18 July 2017

Dogleg

A term applied to a sharp change in direction of the wellbore, usually resulting in abnormal fatigue to the drill stem and frequently resulting in key […]
18 July 2017

Dope

A generic term applied to all types of thread lubricants.
18 July 2017

Double

A length of drill pipe, casing, or tubing consisting of two joints screwed together. Compare fourble, thribble. See joint.
18 July 2017

Double board

The name used for the working platform of the derrickman, or monkeyboard, when it is located at a height in the derrick or mast equal to […]