(19)

(11)

EP 2 721 247 A1

(12)

(43) Date of publication: 23.04.2014 Bulletin 2014/17 (21) Application number: 12803334.7 (22) Date of filing: 20.06.2012

(51) International Patent Classification (IPC):  E21B 34/14(2006.01) E21B 29/00(2006.01) E21B 17/00(2006.01) E21B 43/12(2006.01) (86) International application number: PCT/CA2012/050412 (87) International publication number: WO 2012/174662 (27.12.2012 Gazette 2012/52)

(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: 20.06.2011 US 201161499071 P 22.11.2011 US 201161562556 P 20.03.2012 US 201261613299 P (71) Applicant: Packers Plus Energy Services Inc. Calgary, Alberta T2P 2V7 (CA)	(72) Inventors: THEMIG, Daniel Jon Calgary, Alberta T2W 5P9 (CA) COON, Robert, Joe Missouri City, Texas 77459 (US) (74) Representative: Wilson Gunn  5th Floor Blackfriars House The Parsonage Manchester M3 2JA Manchester M3 2JA (GB)