08540035 is referenced by 24 patents and cites 45 patents.

Embodiments of the present invention generally relate to extendable cutting tools for use in a wellbore. In one embodiment, a tool for use in a wellbore includes a tubular body having a bore therethrough, an opening through a wall thereof, and a connector at each longitudinal end thereof; and an arm. The arm is pivotally connected to a first piston and rotationally coupled to the body, is disposed in the opening in a retracted position, and is movable to an extended position where an outer surface of the arm extends outward past an outer surface of the body. The tool further includes the first piston. The first piston is disposed in the body bore, has a bore therethrough, and is operable to move the arm from the retracted position to the extended position in response to fluid pressure in the piston bore exceeding fluid pressure in the opening. The tool further includes a lock operable to retain the first piston in the retracted position; and a second piston operably coupled to the lock.

Title
Extendable cutting tools for use in a wellbore
Application Number
12/616107
Publication Number
8540035 (B2)
Application Date
November 10, 2009
Publication Date
September 24, 2013
Inventor
Frederick T Tilton
Spring
TX, US
Michael J Moody
Katy
TX, US
Tommy L Laird
Cypress
TX, US
David J Brunnert
Cypress
TX, US
Andrew Antoine
Houston
TX, US
Christopher M Vreeland
Houston
TX, US
Thomas M Redlinger
Houston
TX, US
Simon J Harrall
Houston
TX, US
Albert C Odell II
Kingwood
TX, US
Wei Jake Xu
Houston
TX, US
Agent
Patterson & Sheridan L
Assignee
Weatherford Lamb
TX, US
IPC
E21B 7/28
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