(19)

(11)

EP 4 007 839 A1

(12)

(43) Date of publication: 08.06.2022 Bulletin 2022/23 (21) Application number: 20751272.4 (22) Date of filing: 31.07.2020

(51) International Patent Classification (IPC):  E21B 33/12(2006.01) E21B 36/00(2006.01) E21B 33/134(2006.01) (52) Cooperative Patent Classification (CPC): E21B 33/1204; E21B 33/134; E21B 36/008 (86) International application number: PCT/GB2020/051845 (87) International publication number: WO 2021/023978 (11.02.2021 Gazette 2021/06)

(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: 02.08.2019 GB 201911111 (71) Applicant: Resolute Energy Solutions Limited Stonehaven, Aberdeenshire AB39 2TF (GB)	(72) Inventor: LEES, Iain Aberdeenshire AB39 2TF (GB) (74) Representative: HGF  HGF Limited 1 City Walk Leeds LS11 9DX Leeds LS11 9DX (GB)