(19)

(11)

EP 3 262 271 A1

(12)

(43) Date of publication: 03.01.2018 Bulletin 2018/01 (21) Application number: 15882927.5 (22) Date of filing: 14.05.2015

(51) International Patent Classification (IPC):  E21B 21/08(2006.01) (86) International application number: PCT/CA2015/000317 (87) International publication number: WO 2016/134442 (01.09.2016 Gazette 2016/35)

(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: 26.02.2015 US 201562121189 P (71) Applicants: Reitsma, Donald G. Kelowna, British Columbia V1V 2K7 (CA) Reitsma, Iona M. Kelowna, British Columbia V1V 2K7 (CA)	(72) Inventors: Reitsma, Donald G. Kelowna, British Columbia V1V 2K7 (CA) Reitsma, Iona M. Kelowna, British Columbia V1V 2K7 (CA) (74) Representative: Meyer, Thorsten  Meyer Patentanwaltskanzlei Pfarrer-Schultes-Weg 14 89077 Ulm 89077 Ulm (DE)