(19)

(11)

EP 3 423 669 A1

(12)

(43) Date of publication: 09.01.2019 Bulletin 2019/02 (21) Application number: 17760477.4 (22) Date of filing: 17.02.2017

(51) International Patent Classification (IPC):  E21B 19/06(2006.01) E21B 19/16(2006.01) F16L 37/00(2006.01) E21B 19/07(2006.01) E21B 31/20(2006.01) (86) International application number: PCT/US2017/018261 (87) International publication number: WO 2017/151325 (08.09.2017 Gazette 2017/36)

(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: 29.02.2016 US 201615056587 (71) Applicant: 2M-Tek, Inc. Scott, LA 70583 (US)	(72) Inventors: MCINTOSH, Richard Scott, Louisiana 70583 (US) CORSE, Ian Scott, Louisiana 70583 (US) (74) Representative: Murgitroyd & Company  Scotland House 165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)