Control system for downhole casing milling system
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United States of America Patent
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Jun 13, 2017
Grant Date -
Sep 15, 2016
app pub date -
Dec 31, 2013
filing date -
Dec 31, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A system and method for milling a casing in a wellbore wherein an upper milling portion of a milling system engages a track of a lower guide system of the milling system in order to orient the upper milling portion. The upper milling portion moves along a track from a first position to a second position, where the the upper milling portion is securedly affixed to the lower guide portion. A traveling guide arm is used to move the milling portion along a travel path. A piston on the traveling guide arm is disposed between first and second fluid chambers, with a throughbore in the piston forming a fluid path between the two chambers. An adjustable valve in the throughbore is controlled by a proximity sensor to alter the flow of fluid between the chambers. The sensor monitors the distance between a fixed and moving point of the milling system.
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