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(11)

EP 3 247 870 A1

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(43) Date of publication: 29.11.2017 Bulletin 2017/48 (21) Application number: 16740605.7 (22) Date of filing: 19.01.2016

(51) International Patent Classification (IPC):  E21B 29/00(2006.01) E21B 29/06(2006.01) E21B 29/02(2006.01) (86) International application number: PCT/US2016/013957 (87) International publication number: WO 2016/118525 (28.07.2016 Gazette 2016/30)

(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: 19.01.2015 US 201562105130 P 02.11.2015 US 201514930369 (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) BOELTE, William, F. Arlington, TX 76001 (US) (74) Representative: Johnson, Yvonne Catherine  Barker Brettell LLP 100 Hagley Road Edgbaston Birmingham B16 8QQ Edgbaston Birmingham B16 8QQ (GB)