Patent ID: 9217303
Filing Date: 2015-12-22
Classification: B25B,E21B

Abstract:
1. An apparatus for connecting or disconnecting a threaded coupling between two riser joints of a completion and work over riser where the threaded coupling is of the type having a main nut with a locking nut located above the main nut, wherein the apparatus comprises: a frame, which is provided with a space for receiving the threaded coupling; a first drive wheel set, which is carried by the frame and comprises one or more rotatable drive wheels for rotating the main nut of the threaded coupling in order to spin in the main nut and tighten it with the required torque or release and spin out the main nut; a first drive motor carried by the frame for rotating the one or more drive wheels of the first drive wheel set; a second drive wheel set, which is carried by the frame and comprises one or more rotatable drive wheels for rotating the locking nut of the threaded coupling in order to spin in the locking nut and tighten it with the required torque or release and spin out the locking nut; and a second drive motor carried by the frame for rotating the one or more drive wheels of the second drive wheel set, the second drive motor separately operable from the first drive motor to individually drive the second drive wheel set independent of the first drive wheel set; and wherein the one or more drive wheels of the second drive wheel set are located on a level above the one or more drive wheels of the first drive wheel set so as to thereby allow the one or more drive wheels of the second drive wheel set to engage with and rotate the locking nut of the threaded coupling when the one or more drive wheels of the first drive wheel set are in engagement with the main nut of the threaded coupling.