DEVICE FOR CENTERING AT LEAST ONE PUMP ROD IN A PRODUCTION PIPE OF AN OIL WELL

摘要

The invention relates to a device 10 for centering at least one pumping rod 32 in a pipe for producing an oil well, comprising a body element 12 with slots 14 in which rotating elements 16 are mounted. / P P The problem to be solved consists in reducing the wear of the pipe and the elements. / P P The device is characterized in that each rotating element 16 is made of a material whose Brinnel hardness is at least 50 units (HB) less than the material hardness of the production line, this relationship being maintained at service temperatures of 149 degrees C or more. / P P L invention is applicable in particular to heavy and extra-heavy oil wells. / P