(19)

(11)

EP 2 737 154 A1

(12)

(43) Date of publication: 04.06.2014 Bulletin 2014/23 (21) Application number: 13781335.8 (22) Date of filing: 23.04.2013

(51) International Patent Classification (IPC):  E21B 7/00(2006.01) E21B 17/04(2006.01) E21B 4/04(2006.01) E21B 19/16(2006.01) (86) International application number: PCT/NO2013/050068 (87) International publication number: WO 2013/162377 (31.10.2013 Gazette 2013/44)

(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: 23.04.2012 NO 20120473 (71) Applicant: Norhard AS 4441 Tonstad (NO)	(72) Inventor: HAUGHOM, Sigurd Kjell N-4440 Tonstad (NO) (74) Representative: Håmsø Patentbyrå ANS  Postboks 171 4302 Sandnes 4302 Sandnes (NO)