(19)

(11)

EP 2 596 203 A2

(12)

(88) Date of publication A3: 17.01.2013 (43) Date of publication: 29.05.2013 Bulletin 2013/22 (21) Application number: 11730705.8 (22) Date of filing: 13.07.2011

(51) International Patent Classification (IPC):  E21B 21/10(2006.01) (86) International application number: PCT/EP2011/061963 (87) International publication number: WO 2012/010480 (26.01.2012 Gazette 2012/04)

(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: 20.07.2010 US 840097 (71) Applicant: Managed Pressure Operations Pte. Ltd Singapore 099253 (SG)	(72) Inventors: LEUCHTENBERG, Christian B-1200 Brussels (BE) MAY, James, Ronald Houston Texas 77023 (US) (74) Representative: Lawson, Alison Christina  Forresters Skygarden Erika-Mann-Strasse 11 80636 München 80636 München (DE)