Patent ID: 6758279
Filing Date: 2004-07-06
Classification: E21B

Abstract:
A tool for moving within a passage, comprising:a body configured for insertion into a passage, said body defining a piston fixed with respect to said body; an assembly mounted radially outward from said body, said assembly at least partially defining a chamber surrounding said piston, said assembly being longitudinally slidable with respect to said body; and a gripper coupled to said assembly, said gripper configured to anchor itself to an inner surface of the passage when said gripper is in an expanded condition and permit relative movement between said gripper and said inner surface of said passage when said gripper is in a retracted position; wherein a fluid may be directed through said chamber against said piston whereby pressure of said fluid causes relative movement between said assembly and said piston and from said chamber into a gripper actuation channel whereby pressure of said fluid moves said gripper into said expanded condition.