(19)

(11)

EP 2 670 943 A1

(12)

(43) Date of publication: 11.12.2013 Bulletin 2013/50 (21) Application number: 12741833.3 (22) Date of filing: 03.02.2012

(51) International Patent Classification (IPC):  E21B 33/13(2006.01) E21B 37/02(2006.01) E21B 43/11(2006.01) E21B 37/00(2006.01) (86) International application number: PCT/NO2012/050016 (87) International publication number: WO 2012/105852 (09.08.2012 Gazette 2012/32)

(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: 03.02.2011 NO 20110190 (71) Applicant: TCO AS 5817 Bergen (NO)	(72) Inventors: LERBREKK, Morten N-4340 Bryne (NO) MELHUS, Geir Arne N-4340 Bryne (NO) (74) Representative: Acapo AS  P.O. Box 1880 Nordnes NO-5817 Bergen NO-5817 Bergen (NO)