Page 92: of Offshore Engineer Magazine (May/Jun 2013)

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entire subsea system, giving hydrate removal on an the margin to the hydrate electric line from a riser- formation curve for actual less light well intervention operation conditions. (RLWI) vessel by Welltec.

Subsea

Cameron will present the Ole Eddie Karlsen, VP development and qualifca- Subsea, at Welltec, says the tion of its new high fow frm was brought in after a chemical injection metering build-up in the wellhead valve for gas projects. cavity was observed indi-

David Simpson, subsea cating a possible blockage product manager for Camer- by a hydrate plug. on, will outline how deep- Methanol had been water chemical injection of pumped through the injec-

An artists’ impression of the Asgard compression module. large volumes of MEG or tion master valve, which methanol for hydrate inhibi- had cleared the hydrate tion will be a signifcant Australia. between the fow valve challenge for some of the large bore It provides infnite fow rate regu- and the wing valve, but the amount gas wells currently under develop- lation up to 26,500 l/h+, with high below the subsea tree was unknown. ment or being planned. native fow rate measurement accura- “Instead of going in with an ex-

Cameron’s new valve aims to cy in an extremely low pressure drop pensive rig, we went in with a vessel achieve accurate delivery of hydrate device, Cameron says. and electric wireline,” Karlsen says. suppression chemicals through a pat- Despite all the efforts, hydrates can “Usually you use risers and pump ented non-intrusive ultrasonic fow still form. Being able to remove them MEG in. We went in with our (3.8) measurement closed-loop control from subsea wells is a problem that reverse circulating bit tool, closed device currently being deployed on will be addressed by Welltec at UTC. the well, and flled the lubricator on a number of gas projects in the North The frm is to present on what the subsea stack with MEG, then ran

Sea, South China Sea and Western is being billed as the world’s frst in and started milling, displacing the

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