Patent ID: 6332501
Filing Date: 2001-12-25
Classification: E21B

Abstract:
Apparatus for injecting coiled tubing into a wellbore from a source and withdrawing same, comprising:a chain conveyor driven about an endless path and having at least one linear section aligned with the wellbore;a multiplicity of gripper blocks conveyed and driven by the chain conveyor, the gripper blocks forming a substantially continuous coiled tubing support while traversing the linear section; anda linear array of a multiplicity of rollers in parallel and opposing arrangement to the linear section of the chain conveyor for forming a corridor between the rollers and the gripper blocks and through which the coiled tubing extends, the rollers urging the coiled tubing into frictional engagement with the gripper blocks so that as the gripper blocks are driven about the endless path they frictionally drive the coiled tubing, along, the corridor to inject or withdraw coiled tubing.