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 spool-shaped attachment on the end of the catshaft. around which rope for hoisting and moving heavy equipment on or near the rig floor is wound. See break- out cathead, makeup cathead.

n: A spool-shaped extension of the drawworks shaft used to lift heavy equipment around the rig and make-up or break-out the drill pipe.

n: on a spinning chain, a piece of fiber rope (soft line) that is attached to the end of the chain that is wrapped around the tool joint. When the makeup cathead pulls the chain off the drill pipe, a rotary helper uses the guideline to control the chains movement.

(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

n: a device that is attached to the shaft of the draw works and used as a power source for screwing together joints of pipe. It is usually located on the drillers side of the drawworks. Also called spinning cathead. See cathead.

n: a Y -shaped chain used to spin up (tighten) one joint of drill pipe into another. In use, one end of the chain is attached to the tongs, another end to the makeup cathead, and the third end is free. The free end is wrapped around the tool joint, and the cathead pulls the chain off the joint, causing the joint to spin (turn) rapidly and tighten up. After the chain is pulled off the joint, the tongs are secured in the same spot, and continued pull on the chain (and thus on the tongs) by the cathead makes up the joint to final tightness.

a chain moved by a counterweight or winch to assist in making up drill pipe joints.