E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 23/00 (2006.01) E21B 19/22 (2006.01)
Patent
CA 2074384
Apparatus for injecting and withdrawing a length of flexible cylindrical tubing into and from a well bore comprises first and second sets of gripper shoes that are moved around first and second endless paths, respectively. The paths include first and second parallel sections disposed on opposite sides of a length of the tubing, the gripper shoes being pressed against the tubing with sufficient force to hold the tubing therebetween. Each gripper shoe includes: a base portion and at least two gripper elements each having cylindrical gripping surfaces. Each cylindrical surface has a radius of curvature corresponding to the outer surface of the tubing. At least one of the gripper elements is connected to the base member in a manner permitting movement of the element relative to the base portion between a closed position where the cylindrical gripping surface engages the tubing and an open position that facilitates engagement and disengagement of the gripping shoe elements with the tubing.
Hydra Rig Incorporated
Kirby Eades Gale Baker
Varco I/p Inc.
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