Patent ID: 7156181
Filing Date: 2007-01-02
Classification: E21B

Abstract:
1. A tool for moving within a passage, comprising: an elongated body having an internal fluid chamber; a conduit secured to the body and configured to convey fluid from an external fluid source to the internal fluid chamber of the body; at least one gripper assembly on the body, the gripper assembly configured to utilize fluid pressure to grip onto an inner surface of the passage; at least one propulsion assembly on the body, the propulsion assembly configured to utilize fluid pressure to propel the body within the passage when the gripper assembly grips onto the inner surface of the passage; a valve assembly configured to direct pressurized fluid to and from the gripper assembly and the propulsion assembly to produce movement of the body within the passage; and an electrically controlled start/stop valve having an open position in which the start/stop valve opens a first flow path from the internal fluid chamber of the body to an inlet of the valve assembly to power movement of the tool, the start/stop valve having a closed position in which the start/stop valve closes said first flow path.