دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: heavy pipe that is spiraled-much like a spiral drill collarwith extra-length tool joints but without a center wear pad. Compare heavy-walled drill pipe. See spirally-grooved drill collar.

a drill collar with spiraled grooves down its length to improve circulation of fluids in close clearance well bores.

a brand name of a spiral shaped solid body centralizer for casing and screens.

n: a drill collar with a round cross section that has a long continuous groove or flute machined helically into its outer surface. The spiraled groove provides space between the wall of the hole and the body of the collar, minimizing the area of contact between the hole wall and the collar;thus the possibility of differential pressure sticking is reduced.

n: a device consisting of a scribed tube partially filled with a viscous liquid (spirit) that is designed to determine a horizontal line or plane. Since the tube is only partially filled, a bubble forms. By checking where the bubble rests between the scribed lines on the tube, one can determine whether an object is level.

n: see mother hubbard.

n: the area on an offshore structure that is regularly wetted by seawater but is not continuously submerged. Metal in the splash zone must be well protected from the corrosive action of seawater and air.

n: a motor enclosure that allows some outside air to circulate through the motor for cooling. The angle of protection extends to 100. from the vertical.