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An operator in the UK sector of the North Sea needed to mill out a 3.688-in. ID nickel alloy AR nipple located at 18,147 ft (5,531 m) to 3.875 in. ID. This would allow the deployment of a 3.70 OD Thru-Tubing straddle assembly, from Baker Hughes, a GE company (BHGE), below the restriction without removing the completions.