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EP 3 642 447 A1

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(43) Date of publication: 29.04.2020 Bulletin 2020/18 (21) Application number: 18735388.3 (22) Date of filing: 15.06.2018

(51) International Patent Classification (IPC):  E21B 33/05(2006.01) E21B 21/02(2006.01) E21B 19/00(2006.01) (86) International application number: PCT/GB2018/051668 (87) International publication number: WO 2018/234764 (27.12.2018 Gazette 2018/52)

(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: 23.06.2017 US 201715631068 (71) Applicant: Blackhawk Specialty Tools, LLC Houston, TX 77042 (US)

(72) Inventors: ROBICHAUX, Ron D Houston, Texas 77041 (US) MARTENS, James G Houston, Texas 77041 (US) HEBERT, John E Houston, Texas 77041 (US) MONDELLI, Juan, Carlos Houston, Texas 77041 (US) CHAMPAGNE, James Houston, Texas 77041 (US) BOUDREAUX, Joseph Houston, Texas 77041 (US) SCOTT, Scottie J Houston, Texas 77041 (US) LECOMPTE, Jeremy Houston, Texas 77041 (US) (74) Representative: Haseltine Lake Kempner LLP  Lincoln House, 5th Floor 300 High Holborn London WC1V 7JH London WC1V 7JH (GB)