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Illustration of AGR’s riserless drilling without any pressurized equip- mud recovery system. ment on the surface, it can help make deepwater drills safer. And it’s lighter:

The RDM-Riserless a 21-in. riser puts out around 1000kg

Subsea

One system getting the most (2200lbs) of liquid per meter, but the attention right now is the Reelwell drill cuts that volume down to

RDM-Riserless from Norway- 50kg (110lbs) per meter.

based Reelwell. Developed in “It’s a major weight difference,” 2004, this system hinges on Reelwell CEO Jostein Aleksandsersen a dual drill string, a 6.625-in. said. “The main capacity of these drilling pipe that comes with a 3.5-in. weights is to handle the ? uid volume. It inner pipe – in other words, reduces the need for a higher capacity a mini-drill in a mini-riser. [because] you don’t need to ? ll the riser.”

Drilling ? uid ? ows down The end result of all this is a system through the annular channels that can support the increased pressures of the well and comes back up of a deepwater and public recognition. through the inner pipe. Rock Reelwell received a Spotlight on New cuttings are transported to Technology Award from the Offshore the surface through the inner Technology Conference in 2013, one of pipe along with drilling ? uid, 15 developments to be so honored.

which leaves them out of the Reelwell has marketed its riserless well annulus and helps keep system as a means for companies to get the hole clean. more use out of their older rigs. Instead

As the return ? ow of drilling of building new rigs to operate heavier ? uid comes through a closed- risers, they can retro? t its drill and save loop high-pressure system, the on construction costs. the technology is there, and compa- Reelwell system helps mitigate some of In that sense, Aleksandersen calls it a nies are out there with systems that the possible pitfalls of conventional drill- “rig of opportunity.” are becoming the new standard in the ing. With its ability to switch between “That’s the major reason of going into industry. managed pressure and underbalanced the market,” Aleksandersen said. “It’s

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