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(11)

EP 3 341 558 A1

(12)

(43) Date of publication: 04.07.2018 Bulletin 2018/27 (21) Application number: 16840262.6 (22) Date of filing: 29.08.2016

(51) International Patent Classification (IPC):  E21B 29/00(2006.01) E21B 23/04(2006.01) (86) International application number: PCT/US2016/049321 (87) International publication number: WO 2017/035537 (02.03.2017 Gazette 2017/09)

(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: MA MD (30) Priority: 27.08.2015 US 201562210937 P 02.11.2015 US 201514930369 05.05.2016 US 201615147755 15.08.2016 US 201615237438 (71) Applicant: Robertson Intellectual Properties, LLC Arlington, TX 76001 (US)

(72) Inventors: ROBERTSON, Michael, C. Arlington, TX 76001 (US) GRATTAN, Antony, F. Arlington, TX 76001 (US) STREIBICH, Douglas, J. Arlington, TX 76001 (US) STEPHENS, Amy Arlington, TX 76001 (US) BOELTE, William, F. Arlington, TX 76001 (US) HUGGINS, Cory Arlington, TX 76001 (US) (74) Representative: Barker Brettell LLP  100 Hagley Road Edgbaston Birmingham B16 8QQ Birmingham B16 8QQ (GB)