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(11)

EP 3 755 865 A1

(12)

(43) Date of publication: 30.12.2020 Bulletin 2020/53 (21) Application number: 19757323.1 (22) Date of filing: 20.02.2019

(51) International Patent Classification (IPC):  E21B 7/00(2006.01) E21B 23/00(2006.01) E21B 49/00(2006.01) E21B 7/28(2006.01) E21B 47/00(2012.01) B23B 5/00(2006.01) (86) International application number: PCT/US2019/018695 (87) International publication number: WO 2019/164889 (29.08.2019 Gazette 2019/35)

(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: 20.02.2018 US 201862632509 P (71) Applicant: ABRADO, INC. Houston, TX 77084 (US)	(72) Inventors: RUTTLEY, David J. Marrero, LA 70072 (US) WYANT, Thomas Slidell, LA 70458 (US) (74) Representative: Ridley, Daniel et al Kilburn & Strode LLP Lacon London 84 Theobalds Road London WC1X 8NL London WC1X 8NL (GB)