kelly
derrick
mud pit
rotary drive
crown block
draw works
travelling block
A large structure standing on four legs and reaching the crown block.
A steel frame on beams at the top of the derrick.
Steel tank used as a mud collector.
A steel frame with wheels which moves up or down in the derrick
A hoisting mechanism which raises or lowers the drill pipe and drill bit.
A steel pipe, located at the top of drill string.
A machine used to impart rotational power to the drill string.
