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...om/en/Terms/b/bit.aspx bit]). The ''rotary table'' is a square hole in the derrick floor with a [http://www.glossary.oilfield.slb.com/en/Terms/r/rotary_bushin ...the hoisting system is used to pick up the kelly so that it hangs from the derrick above the rotary table. ''Tongs'' (large pipe wrenches) (13 and 14) or chai

* derrick http://www.glossary.oilfield.slb.com/en/Terms/d/derrick.aspx * derrick floor http://www.glossary.oilfield.slb.com/en/Terms/d/derrick_floor.aspx

...new location. When under tow, a [[flotation hull]] buoys the jackup. The [[derrick]] is cantilevered over the rear to fit over preset risers if necessary.

...om the geolograph to the top of the kelly via a pulley on the crown of the derrick (see [[Land rigs]]). Kelly height can then be measured and directly related

;DF:derrick floor or drilling fluid

...tating the drill pipe, an assembly that is guided up and down rails on the derrick. The rotating bit cuts or crushes the rock. Drilling mud, consisting of wat