(19)

(11)

EP 3 759 309 A1

(12)

(43) Date of publication: 06.01.2021 Bulletin 2021/01 (21) Application number: 19708652.3 (22) Date of filing: 26.02.2019

(51) International Patent Classification (IPC):  E21B 41/00(2006.01) E21B 47/00(2012.01) (86) International application number: PCT/GB2019/050520 (87) International publication number: WO 2019/166789 (06.09.2019 Gazette 2019/36)

(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: KH MA MD TN (30) Priority: 27.02.2018 GB 201803196 (71) Applicant: Aker Solutions Limited London, Greater London W4 5HR (GB)	(72) Inventor: SLATER, Robin Aberdeenshire AB41 8HQ (GB) (74) Representative: HGF  1 City Walk Leeds LS11 9DX Leeds LS11 9DX (GB)