(19)

(11)

EP 3 325 759 A1

(12)

(43) Date of publication: 30.05.2018 Bulletin 2018/22 (21) Application number: 16759818.4 (22) Date of filing: 25.07.2016

(51) International Patent Classification (IPC):  E21B 33/02(2006.01) E21B 33/00(2006.01) (86) International application number: PCT/GB2016/052272 (87) International publication number: WO 2017/017427 (02.02.2017 Gazette 2017/05)

(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: 24.07.2015 GB 201513132 (71) Applicant: Gorevega Limited Aberdeen AB15 4ZN (GB)	(72) Inventor: GORE, Nathan Aberdeen AB15 4ZN (GB) (74) Representative: Rankin, Douglas  Marks & Clerk LLP Aurora 120 Bothwell Street Glasgow G2 7JS Glasgow G2 7JS (GB)