Importance

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Abstract

A tool for moving within a passage comprises an elongated body; a closed system for converting a circulating flow of a fluid into movement of the tool within the passage, and a pump-powering assembly configured to power the pump, the pump-powering assembly comprising one of a turbine and an E-line controlled motor. The closed system comprises a gripper assembly on the body, a barrel surrounding and engaged with the body, a piston longitudinally fixed with respect to the body, a valve assembly, and a pump configured to circulate the fluid through the closed system. The gripper assembly is configured to utilize fluid pressure to grip onto an inner surface of the passage. The barrel is longitudinally movable with respect to the body, and the gripper assembly is longitudinally fixed with respect to the barrel. The barrel and the body define an annular space therebetween, wherein one or more interfaces between the barrel and the body are sealed to substantially prevent escape of fluid from the annular space to an exterior of the barrel. The piston is positioned within the barrel and fluidly separates the annular space into aft and forward chambers of the barrel, wherein sizes of the aft and forward chambers of the barrel vary as the piston moves longitudinally within the barrel. The valve assembly is configured to direct fluid to and from (1) the gripper assembly and (2) the aft and forward chambers of the barrel to produce movement of the body within the passage.

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First Claim