دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

annular safety valve.

a downhole safety valve that shuts off the annulus.

annular safety valve.

a very small string, usually run along the outside of the tubing and banded to the tubing. Commonly used for hydraulic control of safety valves and sliding sleeves. May also transmit bottom hole gauge data.

n: a small hydraulic line used to run fluid from the surface to a downhole tool, such as a subsurface safety valve.

a small diameter line, usually attached to the outside of tubing, which controls the ScSSV or other downhole tools.

downhole safety valve.

n: a joint used to contain the drill pipe safety valve and connected to the drilling pipe

n: see lower kelly cock.

a full opening valve with threads that match the drill pipe that can be quickly screwed onto the pipe to help control fluid flow up the tubing.

n: a special valve normally 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 prevent drilling mud in the kelly from draining onto the rig floor. In another case, when kick pressure inside the drill stem exists, the drill stem safety valve is closed to prevent the pressure from escaping up the drill stem. Also called lower kelly cock, mud saver valve.

down hole safety valve.