Upper Kelly Cock

Definition - What does Upper Kelly Cock mean?

An Upper Kelly Cock, also known as Upper Kelly Valve, is a full-opening valve installed just between the Kelly and the Kelly swivel with its outside diameter equal to the outside diameter of the drill pipe tool joint. The upper Kelly valve acts like a check valve when it is in engaged position. The valve can be used to shut off the flow in the drill string and act as a safety valve to control the blowout pressures.

Petropedia explains Upper Kelly Cock

Kelly valves are used as safety valves for drill pipes. There are two types of Kelly valves used during E&P activities:

  • Upper Kelly Valve or Upper Kelly Cock
  • Lower Kelly Valve or Lower Kelly Cock
The main purposes of the Upper Kelly Valve are to prevent the well from the high pressures which are generated as a result of blowouts and act as a shut off valve to shut down the flow in the drill string. In certain situations, the upper Kelly valve can also be used as a lower Kelly valve that can stop the mud loss while the Kelly is removed from the drill string.

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