Case Study: RMR® – CNR UK North Sea

CNR drilled subsea wells in 2006/2007 as part of the ongoing development of their Northern North Sea assets. The top-hole sections, for 30” conductor and 20” surface casing, were batch set. Of the eight wells spudded, four did not achieve their objectives and were abandoned. Read about how this problem was solved.


  • CHALLENGE: Serious hole instability problems with stuck pipe leading to well abandonments

  • SOLUTION:Enhanced Drilling provided the Riserless Mud Recovery (RMR®) system so that a closed system with full specification mud could be used, with the RMR® pumping mud back to the rig.

  • RESULTS: This resulted in a stable hole with no problems and the fastest 20” casing run.

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