دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: an upper kelly cock that is enclosed in a ball-shaped housing.

n: a valve installed at one or both ends of the kelly. When a high-pressure backflow occurs inside the drill stem, the valve is closed to keep pressure off the swivel and rotary hose. See lower kelly cock, upper kelly cock.

n: a valve installed between the kelly and the swivel,it is used to control a backflow of fluid up the drill string and isolate the swivel and hose from high pressure.

the valve on the Kelly.

n: a length of pipe inside the swivel that is installed to the swivels washpipe and to which the kelly (or a kelly accessory, such as the upper kelly cock) is attached. It conducts drilling mud from the washpipe and to the drill stem. See washpipe.

n: The rotary carrying pipe fittings in the swivel,its shoulder sitting on the main bearing and join with kelly bar by nipple.

n: a valve installed above the kelly that can be closed manually to protect the rotary hose from high pressure that may exist in the drill stem.

n: The two position and two way valve located between the sub of swivel and the upper of kelly,which can seal the pressure of drill pipe when well blowout.

a valve at the top of the kelly that can be closed in the event of a inside tubing kick or high pressures.