Patent ID: 6247534
Filing Date: 2001-06-19
Classification: E21B

Abstract:
A method for introducing cable into a wellbore, the cable being flexible and solid and having a substantially constant diameter along its length, the method comprisingproviding the cable through a pressure control device to a capstan drive system above an earth wellbore, andpulling the cable through the pressure control device with the capstan drive system, the capstan drive system including a housing and a ring within the housing, the ring driven by a motor, the cable wrapped at least once around the ring, the ring having a flat outer surface without edge flanges and the cable wrapped on said flat outer surface, the method further comprisingrotating the ring with the motor to pull the cable through the pressure control device, andwherein a scroll apparatus is provided on the housing of the capstan drive system, the scroll apparatus comprising a thread-like groove on an inner surface of the housing, the thread-like groove adjacent the ring, the scroll apparatus in continuous contact with the cable and the cable fitting into the thread-like grove as the cable moves across the ring, the method further comprisingcontinuously guiding the cable across the ring's flat outer surface with the scroll apparatus.