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Centralizer for a polished bar and/or a substance pump piston stem
Centralizer for a polished bar and/or a substance pump piston stem
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机译:扶正器,用于抛光的杆和/或物质泵活塞杆
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摘要
The present invention relates to a device which can be used to centralize a polished bar and/or a piston stem of a subsurface pump within a production pipe. The device comprises an elongate, substantially cylindrical body member having a longitudinal axis of symmetry, a plurality of slots in the member, and a plurality of rotatable members eccentrically mounted in the slots with respect to the longitudinal axis of symmetry for permitting simultaneous contact between the rotatable members and the inner wall of a tubular production pipe.
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