(19)

(11)

EP 4 048 865 A1

(12)

(43) Date of publication: 31.08.2022 Bulletin 2022/35 (21) Application number: 20879353.9 (22) Date of filing: 23.10.2020

(51) International Patent Classification (IPC):  E21D 9/087(2006.01) E21C 35/19(2006.01) E21D 9/10(2006.01) (52) Cooperative Patent Classification (CPC): E21D 9/1006; E21B 10/12 (86) International application number: PCT/US2020/057159 (87) International publication number: WO 2021/081399 (29.04.2021 Gazette 2021/17)

(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: 25.10.2019 US 201962926387 P (71) Applicant: ESCO Group LLC Portland, OR 97210 (US)	(72) Inventors: ALLRED, Rose Twin Falls, ID 83301 (US) STITZEL, Adam Portland, OR 97219 (US) (74) Representative: Argyma  14 Boulevard de Strasbourg 31000 Toulouse 31000 Toulouse (FR)