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 […]

Signals transmitted in real-time (while drilling) from an instrument located near the bottom of the drill string to a receiving monitor on the surface (a surface-readout). […]

The hoisting mechanism on a drilling rig. It is essentially a large winch that spools off or takes in the drilling line and thus raises or […]

The cutting or boring element used for drilling. See bit.

A heavy, thick-walled tube, usually steel, used between the drill pipe and the bit in the drill stem to provide a pendulum effect to the drill […]

An extending or telescoping arm with attachable heads, used to guide riser to well center, manipulate tubulars or other items about the drill floor.

Heavily seamless tubing used to rotate the bit and circulate the drilling fluid. Joints of pipe approximately 30 ft (9 m) long are coupled together by […]

All members in the assembly used for rotary drilling from the swivel to the bit, including the kelly, drill pipe and tool joints, drill collars, stabilizers, […]

A method of gathering data on the potential productivity of a formation before installing casing in a well. See formation testing.

The column, or string, of drill pipe with attached tool joints that transmit fluid and rotational power from the kelly to the drill collars and bit. […]

The employee directly in charge of a drilling or workover rig and crew. His or her main duty is operation of the drilling and hoisting equipment, […]

In modern drilling operations, the location from which the Driller operates, generally using joystick controls, to operate drilling and hoisting equipment, as well as to monitor […]