RMR system is uesd for deepwater surface drilling for many years, and it works well. But when I read the related literature, I was confused. Can the RMR system install a blowout preventer on the suction module on the seabed? If the blowout preventer is installed, does it change from a dual gradient to a single gradient?
Through our team's more detailed research on the literature and communication with colleagues, we have a new understanding of this issue. The (Riserless Mud Recovery) RMR system is currently only used in deepwater surface drilling. Its subsea wellhead has only one suction module and no blowout preventer is installed. The subsea wellhead of the RMR system is completely open, and the upper end is connected with seawater. Therefore, the RMR system has a seawater static pressure gradient above the seabed, and a drilling fluid circulating fluid column pressure below the seabed, so as to achieve a dual-gradient pressure control effect.
RMR is used prior to a subsea blow out preventer being installed.
RMR= Riserless mud recovery.
Mud can be recovered to rig versus being dumped at the seabed.
Technical ( we can drill deeper and set less casing string) Financial savings and environmentatl benefits. Before the BOP is run.
Formations are too weak to support a mud column and why top and surface wellbore formations are being drilled.
We drill riserless as this is the safest way to protect the people and the rig should in a worst case a shall (biogenic gas zone be penetrated)
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