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EP 3 914 806 A1

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(43) Date of publication: 01.12.2021 Bulletin 2021/48 (21) Application number: 19911996.7 (22) Date of filing: 20.12.2019

(51) International Patent Classification (IPC):  E21B 43/117(2006.01) E21B 43/11(2006.01) E21B 43/116(2006.01) E21B 29/02(2006.01) E21B 43/114(2006.01) F42B 1/024(2006.01) (52) Cooperative Patent Classification (CPC): F42B 1/028; E21B 43/117; F42B 1/024; F42B 1/032 (86) International application number: PCT/US2019/067937 (87) International publication number: WO 2020/154061 (30.07.2020 Gazette 2020/31)

(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: 23.01.2019 US 201962795685 P (71) Applicant: GeoDynamics, Inc. Millsap, TX 76066 (US)	(72) Inventors: WESSON, David Millsap, Texas 76066 (US) SNIDER, Phil Millsap, Texas 76066 (US) CLARK, Nathan Millsap, Texas 76066 (US) YANG, Wenbo Millsap, Texas 76066 (US) HARDESTY, John Millsap, Texas 76066 (US) (74) Representative: Kleine, Hubertus  Loesenbeck - Specht - Dantz Patent- und Rechtsanwälte Am Zwinger 2 33602 Bielefeld 33602 Bielefeld (DE)