(19)

(11)

EP 2 748 404 A2

(12)

(88) Date of publication A3: 13.02.2014 (43) Date of publication: 02.07.2014 Bulletin 2014/27 (21) Application number: 12791258.2 (22) Date of filing: 11.10.2012

(51) International Patent Classification (IPC):  E21B 19/09(2006.01) (86) International application number: PCT/IB2012/055494 (87) International publication number: WO 2013/054274 (18.04.2013 Gazette 2013/16)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 11.10.2011 NO 20111377 (71) Applicant: Aker MH AS 4604 Kristiansand (NO)	(72) Inventor: OTTERSLAND, Gjerulf N-4631 Kristiansand (NO) (74) Representative: Onsagers AS  Munkedamsveien 35 P.O. Box 1813 Vika 0123 Oslo 0123 Oslo (NO)