Abstract: A cementing tool is provided for use in cementing in casing or pipe in a well bore. The tool has an outer sleeve and an inner sleeve slidably disposed therein. The outer and inner sleeves can comprise aligned openings that allow cement to pass through once an opening seat disposed inside the inner sleeve slides down to expose the openings to the interior of the tool. The inner sleeve has convex protrusions extending outwardly from the inner sleeve and configured as circumferential seals to contact the inner wall of the outer sleeve in an interference fit. When the inner sleeve is moved downward to close off the openings in the outer sleeve, the interference seals prevent pressurized fracking fluid from exiting the tool through the outer sleeve openings.

Abstract: A tubular mandrel is provided as a sleeve around the portion of the rod string polish rod extending through the stuffing box housing. The mandrel is coupled to the polish rod so that they rotate together. Bearings stabilize the mandrel within the housing. Stationary rotary seal means are provided in the housing to seal against the now-stabilized mandrel. Leakage and seal wear are improved when compared with the prior art approach of using compressed packing in direct contact with the polish rod to provide the rotary seal.