18 July 2017

Drillship

A ship constructed to permit a well to be drilled from it at an offshore location. Although not as stable as semisubmersible MODUs, drillships are capable […]
18 July 2017

Drive bushing

Device used to transmit torque from the rotary table to the kelly but allow vertical movement of the kelly while drilling. It may have pins fitting […]
18 July 2017

Drum

1) a cylinder around which wire rope is wound in the drawworks. The drawworks drum is that part of the hoist on which the drilling line […]
18 July 2017

Dry hole

Somewhat loosely used in oil work, but in general any well that does not produce oil or gas in commercial quantities. A dry hole may flow […]