(19)

(11)

EP 3 250 778 A1

(12)

(43) Date of publication: 06.12.2017 Bulletin 2017/49 (21) Application number: 15880607.5 (22) Date of filing: 18.09.2015

(51) International Patent Classification (IPC):  E21B 29/00(2006.01) E21B 33/124(2006.01) E21B 29/02(2006.01) (86) International application number: PCT/US2015/051017 (87) International publication number: WO 2016/122720 (04.08.2016 Gazette 2016/31)

(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: MA (30) Priority: 26.01.2015 US 201514605829 (71) Applicants: Bell, William, T. Huntsville, TX 77340 (US) Rairigh, James, G. Houston, TX 77040 (US)	(72) Inventors: Bell, William, T. Huntsville, TX 77340 (US) Rairigh, James, G. Houston, TX 77040 (US) (74) Representative: Johnson, Yvonne Catherine  Barker Brettell LLP 100 Hagley Road Edgbaston Birmingham B16 8QQ Edgbaston Birmingham B16 8QQ (GB)