MN-DS Multibowl Nested Diverter Snap Ring Wellhead System | Video | Schlumberger

MN-DS | Video

Multibowl Nested Diverter Snap Ring Wellhead System

Multibowl nested-diverter snap-ring wellhead system

Shale operators face many challenges associated with drilling and production. Often, these challenges have a direct effect on well integrity and the ability to perform required operations safely and efficiently. use of lock screws in the wellhead has been the industry mainstay for decades; however, they create potential leak paths. Eliminating lock screws reduces exposure to those leak paths and mitigates any wellhead intervention under the BOP that may have been required during the drilling phase. To impart a higher degree of safety and well integrity, Cameron has developed the MN-DS multibowl nested-diverter snap-ring wellhead system. It is a compact nested wellhead system with internal mechanical locking rings as opposed to external locking mechanisms. Conventional installation of wellhead and all subsequent casing strings must be performed using a time-consuming technique known as rigging down. When casing slips are used for isolation in deviated horizontal wells, hours are spent waiting on cement to cure before completing the well. Also, there is a need to cut and prep casing for installing additional spool sections for additional casing strings or the tubing spool under a suspended load. The MN-DS features an 11-in. rotating mandrel casing hanger for ease of running through a 13-in. BOP and includes threads in the ID of the mandrel hanger to make it possible to set a backpressure valve as soon as cementing is complete. Time traditionally spent waiting on cement to reach an acceptable compressive strength is eliminated, allowing for the BOP to be rigged down and the rig skidded sooner. Today’s high-performance drilling rigs operating in unconventional plays deal with highly deviated wells, which require specifically engineered solutions to ensure the casing reaches TD. With well lateral lengths continuing to increase, the ability to rotate while installing and landing the hanger is beneficial. The MN-DS system allows casing rotation that enables the user to push casing through the heel of the lateral to the toe. When the well is put onto artificial lift, costly issues arise regarding tubing wear, effects of thermal expansion, and potential buckling within the wellbore. A tensioning mechanism is required to maintain proper hole ID regardless of thermal deformation. Because the MN-DS system can be provided with a tension tubing hanger, rod wear due to tubing bend is mitigated. The two-piece tension hanger allows the tubing to rotate independently from the parent bowl, assisting in setting the downhole packer and setting the tubing string in tension. Maintaining constant tension on the tubing string will maximize the life of the tubing and the rod, improving uptime. Already with a successful installed base in North America, the MN-DS wellhead system is a robust solution to shale operators’ challenges. It can be configured with or without an intermediate casing string, depending on formation requirements. It is a unitized, nested multibowl system with no unnecessary body penetrations; the system is ideal for use with today’s high-performance drilling rigs working on single or multiple well pads. The Cameron MN-DS wellhead system brings new opportunities for increasing well integrity in shale.

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