(19)

(11)

EP 3 298 230 A1

(12)

(43) Date of publication: 28.03.2018 Bulletin 2018/13 (21) Application number: 16796818.9 (22) Date of filing: 19.05.2016

(51) International Patent Classification (IPC):  E21B 29/00(2006.01) E21B 31/16(2006.01) E21B 31/00(2006.01) (86) International application number: PCT/NO2016/050097 (87) International publication number: WO 2016/186517 (24.11.2016 Gazette 2016/47)

(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 Designated Validation States: MA MD (30) Priority: 19.05.2015 NO 20150624 (71) Applicant: Sintef TTO AS 7465 Trondheim (NO)	(72) Inventor: TAGHIPOUR KHADRBEIK, Mohammad Ali 7033 Trondheim (NO) (74) Representative: Tafjord, Harald  Bryn Aarflot AS P.O. Box 449 Sentrum 0104 Oslo 0104 Oslo (NO)