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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

...of the kelly via a pulley on the crown of the derrick (see [[Land rigs]]). Kelly height can then be measured and directly related to bit depth. As each foot

;KB:kelly bushing ;RKB:relative to kelly bushing

...nformation commonly found on log headers. For example, drilled depth minus kelly bushing elevation equals subsea elevation.

...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

...s are common.<ref name=ch10r39 /><ref name=ch10r55>Matthews, W. R., and J. Kelly, 1967, How to predict formation pressure and fracture gradient from electri

...data sets. For example, in a data set composed of well information, if the kelly bushing is not known or uniformly subtracted from all wells, the resulting