(19)

(11)

EP 3 344 847 A1

(12)

(43) Date of publication: 11.07.2018 Bulletin 2018/28 (21) Application number: 16843197.1 (22) Date of filing: 06.09.2016

(51) International Patent Classification (IPC):  E21B 23/01(2006.01) E21B 33/04(2006.01) E21B 23/02(2006.01) E21B 43/10(2006.01) (86) International application number: PCT/US2016/050433 (87) International publication number: WO 2017/041108 (09.03.2017 Gazette 2017/10)

(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: 04.09.2015 US 201562214754 P (71) Applicants: Irvine, Jock, W. Houston, TX 77065 (US) Lambert, Thomas, M. Houston, TX 77073 (US)	(72) Inventors: Irvine, Jock, W. Houston, TX 77065 (US) Lambert, Thomas, M. Houston, TX 77073 (US) (74) Representative: Barker Brettell LLP  100 Hagley Road Edgbaston Birmingham B16 8QQ Birmingham B16 8QQ (GB)