(19)

(11)

EP 2 898 172 A1

(12)

(43) Date of publication: 29.07.2015 Bulletin 2015/31 (21) Application number: 13839937.3 (22) Date of filing: 16.09.2013

(51) International Patent Classification (IPC):  E21B 17/046(2006.01) E21B 17/02(2006.01) E21B 17/00(2006.01) (86) International application number: PCT/NO2013/050157 (87) International publication number: WO 2014/046548 (27.03.2014 Gazette 2014/13)

(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 Designated Extension States: BA ME (30) Priority: 18.09.2012 NO 20121063 30.08.2013 NO 20131157 (71) Applicant: Norhard Geo AS 4440 Tonstad (NO)	(72) Inventor: HAUGHOM, Per, Olav N-4440 Tonstad (NO) (74) Representative: Håmsø Patentbyrå ANS  Postboks 171 4302 Sandnes 4302 Sandnes (NO)