Weatherford/lamb, Inc.

James Bain

Rory McCrae Tulloch

Mike Wardley

Binnert Ruerd Haites

A tool for reducing torque on work string, eg for gas or oil production, comprises an upper clamp (), a lower clamp () and connection means (), the three components formed as a unitary structure (). The tool also comprises bearing means, preferably made from an elastomeric compound, and an annular body () (see FIG.) held in place over the connection means by the clamps. The clamps may comprise spigots () for retaining the connection means. In a preferred embodiment the annular body is in two semi-annular components connected at one end to allow them to pivot, and the other end comprises mating castellations for receiving a fastening pin. The annular body may comprise a number of replaceable wear pads () which may be made of bronze or an elastomer. The unitary structure of the tool enhances the integral strength and efficiency of the clamps.

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Montrose, United Kingdom

James Bain