Patent ID: 6553825
Filing Date: 2003-04-29
Classification: E21B

Abstract:
A swivel apparatus for measuring torque, comprising:a. an upper body assembly secured to a drive assembly at its upper end; b. a lower body assembly secured to a drill string at its lower end; c. means for engaging the upper body assembly to the lower body assembly; d. a first wedge member and a second wedge member provided between the upper body assembly and lower body assembly when the assemblies are engaged to record the force of rotation when the lower body assembly rotates against the stationary upper body assembly in either direction, and wherein the first wedge member and the second wedge member include a plurality of pistons set within cylinders in each of four faces disposed on said first wedge member and said second wedge member, the pistons contacting four faces of the lower body assembly when said lower body assembly is rotated.