(19)

(11)

EP 3 635 215 A1

(12)

(43) Date of publication: 15.04.2020 Bulletin 2020/16 (21) Application number: 18749044.6 (22) Date of filing: 06.06.2018

(51) International Patent Classification (IPC):  E21B 33/13(2006.01) E21B 43/114(2006.01) E21B 37/00(2006.01) (86) International application number: PCT/GB2018/051534 (87) International publication number: WO 2018/224819 (13.12.2018 Gazette 2018/50)

(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: 07.06.2017 GB 201709034 (71) Applicant: Ardyne Holdings Limited Aberdeen Aberdeenshire AB10 6DL (GB)	(72) Inventor: FAIRWEATHER, Alan Aberdeen Aberdeenshire AB10 6DL (GB) (74) Representative: Campbell, Arlene  IPentus Limited The Old Manse Wilsontown, By Forth Lanark, ML11 8EP Lanark, ML11 8EP (GB)