دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

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.

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. When the mud pump is stopped, the valve can be manually closed with a special wrench to prevent pressurised fluids in the drill string from flowing into the kelly. When closed, the valve also prevents mud in the kelly from spilling onto the rig floor when the kelly is broken out of the drill string. Also called a drill stem safety valve, mud saver valve.

n: (slang) also called a mud box or mud saver. See mud box.

n: slang, seemud box.

n: a hinged, cylindrical metal device placed around a joint of pipe as it is being broken out during a trip out of the hole. It keeps mud from splashing beyond the immediate area. Also called mother hubbard, mud saver, splash box, or wet box.

n: one of complementary tools that assist the pulling out the hole.

n: also called mud box or mother hubbard. See mud box.

n: also called mud box , see mud box.

n: see mud box.

n: a lower kelly cock. See drill stem safety valve, lower kelly cock.