SPECIAL REPORT: SAKHALIN RMR-1: Elvary Neftegaz plans riserless system for Sakhalin drilling program

In 2006, CJSC Elvary Neftegaz deployed a riserless mud-recovery (RMR) system off Sakhalin Island.An RMR system enables dual-gradient subsea drilling operations to take place with the well open at the seabed. There are no pressure-containment devices at the wellhead, but as with earlier systems developed for deepwater drilling, mud and cuttings are returned to the rig by a subsea pumping system, fluid recovery hose, and umbilical.1 The system was field tested as part of the Norwegian DEMO2000 project.2 Subsequently, it was used in a multiwell drilling campaign in the Caspian Sea.This two-part series describes how the riserless mud-recovery system was implemented in a remote exploration dri...

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