(19)

(11)

EP 2 673 461 A1

(12)

(43) Date of publication: 18.12.2013 Bulletin 2013/51 (21) Application number: 12745359.5 (22) Date of filing: 07.02.2012

(51) International Patent Classification (IPC):  E21B 43/12(2006.01) E21B 43/24(2006.01) E21B 34/06(2006.01) (86) International application number: PCT/CA2012/000105 (87) International publication number: WO 2012/106804 (16.08.2012 Gazette 2012/33)

(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 (30) Priority: 07.02.2011 CA 2730875 (71) Applicants: Klimack, Brian K. Tofield, Alberta T0B 4J0 (CA) Fermaniuk, Brent D. Edmonton, Alberta T5Y 3H7 (CA) Klimack, Jesse Edmonton, Alberta T5P 3L9 (CA)	(72) Inventors: Klimack, Brian K. Tofield, Alberta T0B 4J0 (CA) Fermaniuk, Brent D. Edmonton, Alberta T5Y 3H7 (CA) Klimack, Jesse Edmonton, Alberta T5P 3L9 (CA) (74) Representative: Vogeser, Werner  Hansmann & Vogeser Patent- und Rechtsanwälte Maximilianstrasse 4b 82319 Starnberg 82319 Starnberg (DE)