Patent ID: 7188686
Filing Date: 2007-03-13
Classification: E21B

Abstract:
1. A top drive system for wellbore operations, the top drive system comprising a permanent magnet motor with a top, a bottom, and a motor bore therethrough from the top to the bottom, the permanent magnet motor comprising a hollow bore alternating current permanent magnet motor, a planetary gear system coupled to the permanent magnet motor, the planetary gear system having a top, a bottom, and a gear system bore therethrough from top to bottom, the bottom of the permanent magnet motor adjacent the top of the planetary gear system, the motor bore aligned with the gear system bore so that fluid is flowable through the top drive system from the top of the motor to the bottom of the planetary gear system, a quill drivingly connected to the planetary gear system and rotatable thereby to rotate a tubular member located below the quill, the quill having a top end and a bottom end, the quill, permanent magnet motor, and planetary gear system comprising a top drive, a support system for supporting the permanent magnet motor and the planetary gear system, the support system comprising