دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: see makeup carhead, spinning chain.

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.

n: A long cathead line used in screwing on and screwing off pipe.

n: air-powered or hydraulically powered wrench used to spin drill pipe in making or breaking connections.

n: A hydraulically operated or air powered wrench,which used to screw on and screw off drill string.

n: named twist drill ,too.its blade is spiral shape .used in directional drilling of soft layer.

n: drill collar that have spiral slot on the face .

n: A horizontal cylindrical mixer there have a intaked pipe in the center, some mud jet burners at the bottom,pipeline of jet burner out of the cylindrical.

n: A short pipe that be bored spiral hole,which can make cement slurry jet flow at spiral shape.

n: a helically shaped gripping mechanism that is fined into an overshot to retrieve fish from the borehole. See grapple.