Patent ID: 6293347
Filing Date: 2001-09-25
Classification: E21B

Abstract:
Apparatus for preventing circumferential scoring of a reciprocating polish rod suspended by a carrier structure of a pump jack, the polish rod being rotated with a rod-rotator, the carrier structure comprising one or more stacked components including a top end for suspending the polish rod, a bore extending through the stacked components and through which the polish rod extends, and a bottom end from which the polish rod extends comprising:a cylindrical sleeve having top and bottom ends, the sleeve having an outer dimension adapted to fit within the bore of the carrier structure and having a bore through which the polish rod passes slidably and rotatably; andan upset formed at the top end of the sleeve whichextends radially and engages the stacked components for supporting the sleeve in the bore of the carrier structure and so that the bottom end of the sleeve extends substantially to the bottom end of the carrier structure,forms a bearing surface for supporting the rod-rotator,so that the sleeve guides the polish rod without contact of the polish rod and the carrier structure and thereby prevents circumferential scoring therebetween when the rod is subsequently rotated by the rod-rotator.