Schlumberger

Case Study: Rhino XC Reamer Records 18 Activation Cycles in North Sea Underreaming Operation

After 165-circulating hours, 4,813-ft section enlarged from 12 1/4 to 13 1/4 in

Challenge: Enlarge a 4,813-ft section under conditions that require a reamer to be activated and deactivated repeatedly to close annular access.

Solution: Run the Rhino XC on-demand reamer that has cutter blocks fitted with Onyx PDC cutters, which can be reliably activated and deactivated an unlimited number of times in an average cycle time of 3 minutes.

Result: Enlarged 4,813-ft section from 12 1/4 to 13 1/4 in after 165 circulating hours, during which the Rhino XC reamer’s cutter blocks were activated and deactivated 18 times.

An operator working in the North Sea wanted to conduct an underreaming operation in the waters off the coast of Denmark, which involved several challenges. Enlarge a 4,813-ft section in an operation that required the reamer to be activated and deactivated repeatedly to close annular access. Borehole conditions included the potential for kick and losses. Additionally, at a certain point during the test, the operator required the complete deactivation of the reamer’s cutter blocks to ensure that the casing shoe would remain set at the correct depth.

For this application, Schlumberger recommended using the Rhino XC reamer with ONYX cutters. The reamer is capable of being reliably activated and deactivated from the surface an unlimited number of times in an average cycle time of 3 minutes. It can also be surface tested to check and confirm settings and ensure performance prior to being run in the hole.

Post-test analysis of the run indicated the reamer performed perfectly, meeting all the operational objectives of the application. Upon inspection, the Rhino XC reamer was found to be fully functional and its ONYX cutters graded excellent.


Download: Rhino XC Reamer Records 18 Activation Cycles in North Sea Underreaming Operation (0.50 MB PDF)

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