دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a sucker rod pumping unit. not commonly used. that employs cable wound around a spool. one end going into the hole. the other with a suspended counterweight. This type of unit can achieve 40- to SO-foot ( 12- to 24- metre) stroke lengths. reducing dynamic loads, rod reversals. gas locking. and power usage and can be applied to deep pump applications

n: the action of the sucker rod string as it comes to rest momentarily at d1e bottom or top of the pump stroke and then begins to move downward (if at the top of the stroke) or upward (if at the bottom of the stroke).