دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the heavy steel tubular device, fouror six-sided, suspended from the swivel through the rotary table and connected to the top joint of drill pipe to turn the drill stem as the rotary table turns. It has a bored passageway that permits fluid to be circulated into the drill stem and up the annulus, or vice versa. Kellys manufactured to API specifications are available only in four- or six-sided versions, are either 40 or 54 feet (12 to 16 metres) long, and have diameters as small as 2112 inches (6 centimetres) and as large as 6 inches (15 centimetres).

n: the heave square or hexagonal steel pipe which runs through the rotary table and turns the drill string.

the main rotating shaft on a rotary drilling rig that connects to and turns the drill string.