دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

(pronounced shiv") n: I. a grooved pulley. 2. support wheel over which tape, wire, or cable rides.

n: A pulley. In oilfield usage, the term usually refers to either the pulleys permanently mounted on the top of the rig (the crown blocks),or the pulleys used for running wireline tools into the wellbore. In the case of the crown blocks, the drilling line,

a grooved pulley.