(19)

(11)

EP 2 888 439 A1

(12)

(43) Date of publication: 01.07.2015 Bulletin 2015/27 (21) Application number: 13831655.9 (22) Date of filing: 21.08.2013

(51) International Patent Classification (IPC):  E21B 43/24(2006.01) E21B 36/04(2006.01) E21B 36/00(2006.01) E21B 43/38(2006.01) (86) International application number: PCT/CA2013/000730 (87) International publication number: WO 2014/029009 (27.02.2014 Gazette 2014/09)

(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 (30) Priority: 21.08.2012 US 201261691484 P (71) Applicant: Kemex Ltd. Calgary, AB T2P 3P8 (CA)	(72) Inventors: LITTLE, Laureen Calgary, AB T2P 3P8 (US) JAMES, Kenneth Calgary, AB T3Z 3L7 (CA) NABATA, Bob Calgary, AB T2P 3P8 (CA) (74) Representative: Howard, Paul Nicholas  Carpmaels & Ransford LLP One Southampton Row London WC1B 5HA London WC1B 5HA (GB)