Related Oil & Gas Terms

• Drill stem safety valve

  A special valve installed below the kelly. usually, the valve is open so that drilling fluid can flow out of the kelly and down the drill stem. it can, however, be manually closed with a special wrench when necessary. in one case, the valve is closed and broken out, still attached to the kelly to...

• Safety valve

  1. an automatic valve that opens or closes when an abnormal condition occurs (e.g., a pressure relief valve on a separator that opens if the pressure exceeds the set point, or the shutdown valve at the wellhead that closes if the line pressure becomes too high or too low). 2. a valve installed at the...

• Swivel

  A rotary tool that is hung from the rotary hook and traveling block to suspend the drill stem and to permit it to rotate freely. it also provides a connection fore the rotary hose and a passageway of the flow of drilling fluid into the drill stem....

• Dart-type inside blowout preventer

  A dart-shaped drill pipe inside blowout preventer installed on top of the drill stem when the well is kicking through the drill stem. it is stabbed in open then closed against pressure....

• Rotary

  The machine used to impart rotational power to the drill stem while permitting vertical movement of the pipe for rotary drilling. modern rotary machines have a special component, the rotary or master bushing, to turn the kelly bushing, which permits vertical movement of the kelly while the stem is turning....