(19)

(11)

EP 3 368 721 A2

(12)

(88) Date of publication A3: 15.06.2017 (43) Date of publication: 05.09.2018 Bulletin 2018/36 (21) Application number: 16815706.3 (22) Date of filing: 31.10.2016

(51) International Patent Classification (IPC):  E02B 17/02(2006.01) E21B 33/035(2006.01) E21B 33/14(2006.01) E21B 19/00(2006.01) E21B 33/043(2006.01) (86) International application number: PCT/DK2016/000040 (87) International publication number: WO 2017/071709 (04.05.2017 Gazette 2017/18)

(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: 29.10.2015 DK 201500668 23.12.2015 GB 201522856 23.12.2015 GB 201522857 24.12.2015 GB 201522858 21.01.2016 GB 201601175 23.04.2016 GB 201607101 23.04.2016 GB 201607103 23.04.2016 GB 201607105 23.04.2016 GB 201607102 25.04.2016 GB 201607180 25.04.2016 GB 201607181 25.04.2016 GB 201607182 25.04.2016 GB 201607183 06.10.2016 WO PCT/DK2016/000036 (71) Applicants: Mærsk Drilling A/S 2800 Kgs. Lyngby (DK) Mærsk Olie og Gas A/S 2100 Copenhagen (DK)

(72) Inventors: Kannegaard, Michael 2820 Gentofte (DK) CHAJAI, Hicham 68180 Horbourg-Whir (FR) (74) Representative: Docherty, Andrew John  Marks & Clerk LLP Aurora 120 Bothwell Street Glasgow G2 7JS Glasgow G2 7JS (GB)