(19)

(11)

EP 2 350 435 A1

(12)

(43) Date of publication: 03.08.2011 Bulletin 2011/31 (21) Application number: 09820148.6 (22) Date of filing: 14.10.2009

(51) International Patent Classification (IPC):  E21B 43/08(2006.01) E21B 43/243(2006.01) E21B 43/10(2006.01) (86) International application number: PCT/CA2009/001454 (87) International publication number: WO 2010/043034 (22.04.2010 Gazette 2010/16)

(84) Designated Contracting States: 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 SE SI SK SM TR Designated Extension States: AL (30) Priority: 17.10.2008 CA 2641281 17.10.2008 US 285980 (71) Applicant: Archon Technologies Ltd. Calgary, Alberta T2P 3Y6 (CA)	(72) Inventor: AYASSE, Conrad Calgary Alberta T3B 4V7 (CA) (74) Representative: Maiwald, Walter  Maiwald Patentanwalts GmbH Elisenhof Elisenstrasse 3 80335 München 80335 München (DE)