Get your copy of "Thru-Tubing AMT step mill opened nickel alloy AR nipple to deploy straddle system in a single run"
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.
thru-tubing-amt-deploy-straddle-system-single-run-north-sea-cs.pdf