دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: see breakout cathead, cathead. makeup cathead.

n: The general form of address of mechanized cathead. Used for winding wire line automatically and draw the tongs to make up and breakout.

n: a device attached to the catshaft of the drawworks that is used as a power source for unscrewing drill pipe;usually located opposite the drillers side of the drawworks. See cathead.

n: The self-releasing cathead installed in the cat shaft of drawworks.

n: a wire rope, one end of which is connected to the end of the breakout tongs and the other end of which is attached to the breakout cathead. When the driller activates the cathead, the cathead pulls on the jerk line with great force to apply torque to break out a tool joint (or to tighten a drill collar connection).

n: a passage of steel wire that connected with automatic cathead.

(pronounced Iced") n pi: the pipe tongs suspended in the derrick or mast and operated by a chain or a wire rope connected to the makeup cathead or the break- out cathead. Personnel call the makeup tongs the lead tongs if pipe is going into the hole;similarly, they call the breakout tongs the lead tongs if pipe is coming out of the hole. Compare backup tongs.

n: a pipe tong suspended in the dercick, normally on the left of the driller, used when coming out of the hole to break the connection operated through wire line tied to breakout cathead. Inthis operation it is on pin end of joint to be broken. During makeup