(19)

(11)

EP 2 675 992 A1

(12)

(43) Date of publication: 25.12.2013 Bulletin 2013/52 (21) Application number: 12746863.5 (22) Date of filing: 09.02.2012

(51) International Patent Classification (IPC):  E21B 33/12(2006.01) E21B 33/134(2006.01) (86) International application number: PCT/NO2012/050020 (87) International publication number: WO 2012/112053 (23.08.2012 Gazette 2012/34)

(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: 14.02.2011 NO 20110246 (71) Applicant: WTW Solutions AS 4017 Stavanger (NO)	(72) Inventor: TINNEN, Bård Martin N-4017 Stavanger (NO) (74) Representative: Håmsø, Gunnar  Håmsø Patentbyrå ANS P.O. Box 171 4302 Sandnes 4302 Sandnes (NO)