Drill bit, A tool that breaks rock at the bottom of a well., Drill string, A set of connected drilling pipes and tools., Kelly, A device that transmits rotation to the drill string., Swivel, A device that allows rotation and connects to the lifting system., Crown block, A fixed set of pulleys at the top of the derrick., Travelling block, A movable set of pulleys used in the lifting system., Winch, A device used to raise and lower equipment., Cable, A steel line used for lifting equipment., Drill collar, A heavy component of the drill string., Hook, A component used to suspend and hold drilling equipment., Pulley, A wheel used to guide a cable., Casing, A pipe installed in a well to support its walls., Turntable, A device that rotates the drill string.
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