(19)

(11)

EP 2 297 427 A1

(12)

(43) Date of publication: 23.03.2011 Bulletin 2011/12 (21) Application number: 09753389.7 (22) Date of filing: 01.06.2009

(51) International Patent Classification (IPC):  E21B 33/14(2006.01) E21B 33/124(2006.01) E21B 17/00(2006.01) E21B 34/14(2006.01) (86) International application number: PCT/CA2009/000748 (87) International publication number: WO 2009/143628 (03.12.2009 Gazette 2009/49)

(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 TR Designated Extension States: AL BA RS (30) Priority: 30.05.2008 US 57402 (71) Applicant: Packers Plus Energy Services Inc. Calgary, Alberta T2P 2Y3 (CA)	(72) Inventor: THEMIG, Daniel Jon Calgary, Alberta T2W 5P9 (CA) (74) Representative: Perkins, Sarah et al Stevens Hewlett & Perkins 1, Pemberton Row London EC4A 3BG London EC4A 3BG (GB)