The string of tools that are used to drill a well, i.e., the kelly, drillpipe, drill collars, stabilizers and drilling bit.
Also called drill pipe or drill stem. Thirty-foot lengths of steel tubing screwed together to form a pipe connecting the drill bit to the drilling rig. The sting is rotated to drill the hole and also serves as a conduit for drilling mud.
Steel pipes roughly 10m long joined together to form a pipe from the drill bit to the drilling platform. It is rotated during drilling and is also the conduit for the drilling mud.
The long assembly of drill bit, drill collars and many lengths of pipe that is turned by the rotary table and cuts through the rock.
String of individual joints of pipe that extends from the bit to the kelly and carries the mud down to, and rotates, the bit.
the total string of drill pipe with attached tools and bit.
the column of drill pipe lengths screwed together.
The column, or string, of drill pipe, not including the drill collar or kelly. Often, however, the term is loosely applied to include both the drill pipe and drill collars.
In petroleum drilling technology, a drill string in an oil rig is the column, or string, of drill pipe with attached tool joints that transmits fluid and rotational power from the kelly drive or top drive to the drill collars and bit. Often, especially in the oil patch, the term is loosely applied to both drill pipe and drill collars. Some type of drilling fluid is almost always pumped down the inside of the drill string and circulated back up the annulus, or ring shaped void between the drill string and the formation.