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A customer working on a development well in the Gulf of Mexico needed to rework its upper completion, which would require removing a permanent packer from the wellbore. The packer was made of Inconel 718-125 MY, a corrosion-resistant nickel super alloy extremely difficult to mill. The operator was skeptical the packer could be milled given the challenges with corrosion resistant alloy (CRA), and was preparing to sidetrack the well. The sidetrack preparations would require at least two weeks of downtime, and the operator estimated it would take at least six trips to mill the packer—if it could be milled at all.