Method and apparatus for limiting eccentric deviations of a rotating polished rod in rotary pumping applications

摘要

A method for limiting eccentric deviations of a rotating polished rod which extends through a stuffing box in a downhole rotary pumping application. The method includes the step of positioning below the stuffing box at least two centralizing members having arcuate contact surfaces that engage the rotating polished rod to dampen eccentric deviations. According to another aspect of the present invention there is provided an apparatus having a housing with a central polished rod receiving passage. At least two centralizing members extend radially inwardly into the central polished rod receiving passage to engage a rotating polished rod positioned in the central polished rod receiving passage.