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RMR® - Riserless Mud Recovery

Drill your top-holes with engineered mud and full returns to the rig. Save time, money and the environment



What is RMR®

The RMR® Riserless Mud Recovery system is a risk-reduction tool that enables the drilling of a better quality, more stable top-holes - safer, quicker and with less environmental impact. This Dual Gradient Drilling system is an innovative way to return mud and cuttings to the rig before the marine riser is run, without discharge to the seabed. With RMR® there is no 'Pump & Dump'.

Thanks to its closed-loop design, engineered fluids can be used on the top-hole section and recycled - which makes sense safety-wise, environmentally and financially.

Where Do You Apply RMR® Technology

Drilling Top-Holes

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Shallow Flow Hazards

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Cuttings Build-Up

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Environmentally Sensitive Areas

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How RMR® Can Help You

  • Primary well control before BOP/riser installed
  • Ability to check for shallow-hazard influx without a pilot hole
  • Improved hole stability
  • Deeper surface casing
  • Fewer casing strings
  • Top-hole mud-log data and cuttings
  • No cement top-up jobs required
  • Zero discharge at seabed

Safety Advantages

  • Safe identification of gas
  • Better conductor/Xmas Tree stability
  • Mud volume control in surface hole
  • Fast gain/loss indication
  • Real-time visual monitoring of the well
  • No smothering of seabed by cuttings
  • Lower risk of undermining well/template

How to Get Started

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You can rely on our experience - RMR® has been used on more than 1000 wells to date all over the world for a decade and a half.

Using the system, an operator eliminated a 20" casing and successfully set 13 5/8" surface casing down to more than 2,350m (7,710ft). The system has been deployed from shallow waters down to more than 1,400 m (4,600 ft) in deep water application.

All 3 Crest

How RMR® Works

The RMR® system has an electrical pump (SPM) placed on the seabed, and a funnel (SMO) on top of the Subsea Wellhead. By connecting a suction hose between the funnel and the subsea pump, the system pumps out mud, cuttings and debris coming from the well, and returns it to surface and over the shakers through the return line. The level of mud in the funnel is constantly monitored by cameras and pressure sensors to make sure that everything is pumped to surface and nothing is spilled to sea. The suction point is placed as low as possible on the funnel to also make sure that seawater does not contaminate the mud that is pumped back to surface.  


RMR Pump Technology

Case Studies


1. BP, Caspian Sea

Problems with shallow formations forced BP to abandon its West Azeri template in the Caspian Sea. Read how they solved their issue using RMR® technology



2. CNR, UK North Sea

Hole instability problems with stuck pipe led to well abandonments. Read how RMR® was used to solve this issue, which resulted in a stable hole with no problems and the fastest 20” casing run.



3. BP, Sakhalin Island

Russian environmental protection regulations forbid any discharge of cuttings after the conductor is set. Read about how these reguations were met using the RMR® system.



4. BP, Egypt

BP Egypt wished to install service casing at about 1,085m. However, experienced a lot challenges. Read about how standard RMR® equipment was modified for this operation.



5. INPEX, Browse Basin

Soft sand tends to fall into the wellbore, causing pack-offs and stuck pipe, which can prevent casing being run to dept. Read how this issue was solved using RMR® without the extra time and cost of 20”casing.



6. Equinor, Gulf of Mexico

Statoil planned to drill an exploration well in an area known for shallow geo-hazards. Read how RMR® was used in order to minimise risks.



A large number of successful drilling operations all over the world have proven the RMR® technology to be a highly beneficial solution for drilling top holes in difficult downhole conditions, as well as reducing conductor/casing


Get in depth knowledge about the RMR® system by reading our product material.


Riserless Mud recovery

RMR® Brochure

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RMR riserless

Your Experts

Bernt Eikemo

Vp sales

Mobile:+47 97 72 77 60
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