(19)

(11)

EP 3 938 621 A1

(12)

(43) Date of publication: 19.01.2022 Bulletin 2022/03 (21) Application number: 20771175.5 (22) Date of filing: 10.03.2020

(51) International Patent Classification (IPC):  E21B 43/26(2006.01) E21B 33/124(2006.01) (52) Cooperative Patent Classification (CPC): E21B 43/26; E21B 44/00; E21B 21/08; E21B 43/2605 (86) International application number: PCT/US2020/021928 (87) International publication number: WO 2020/185803 (17.09.2020 Gazette 2020/38)

(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: 11.03.2019 US 201962816886 P (71) Applicant: SPM Oil & Gas Inc. Fort Worth, TX 76108 (US)	(72) Inventor: STEWART, Trever Dean Fort Worth, Texas 76135 (US) (74) Representative: Boult Wade Tennant LLP  Salisbury Square House 8 Salisbury Square London EC4Y 8AP London EC4Y 8AP (GB)