Challenge: Underream a 14-in, 615-m pilot-hole section, enlarging it to 17 in through an unstable formation known to cause sticking in one trip.
Solution: Run a 14250 Rhino XS hydraulically expandable reamer to increase wellbore quality and casing running efficiency.
Results: Underreamed the 615-m section in one trip, enlarging it from 14 in to 17 in and enabling the operator to set the 13.375-in casing more efficiently; saved approximately three rig days, marking the first time an underbalanced underreaming was performed in a well with a two-phase nitrogen mud system.