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...y bushing] that is used to turn the ''kelly bushing'' (9) and kelly. The ''kelly'' is a square or hexagonal length of pipe that is screwed on the drill pipe ...y stored in the ''mouse hole'' (11), a cased opening in the rig floor. The kelly and the new joint of pipe are then screwed on the previous pipe and lowered

* kelly http://www.glossary.oilfield.slb.com/en/Terms/k/kelly.aspx * kelly bushing http://www.glossary.oilfield.slb.com/en/Terms/k/kelly_bushing.aspx

...ulating system's surface equipment (such as the standpipe, kelly hose, and kelly), drill string bore, jet nozzles, and annulus. Only the pressure expended t