(19)

(11)

EP 2 627 865 A1

(12)

(43) Date of publication: 21.08.2013 Bulletin 2013/34 (21) Application number: 10852327.5 (22) Date of filing: 02.06.2010

(51) International Patent Classification (IPC):  E21B 43/34(2006.01) E21B 43/26(2006.01) (86) International application number: PCT/CA2010/000814 (87) International publication number: WO 2011/150486 (08.12.2011 Gazette 2011/49)

(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 SE SI SK SM TR Designated Extension States: BA ME RS (71) Applicant: Gasfrac Energy Services Inc. Calgary, Alberta T2P 3P4 (CA)	(72) Inventors: LOREE, Dwight, N. Black Creek British Columbia V9 J1A8 (CA) MESHER, Shaun, T. Calgary Alberta T2E 2A5 (CA) (74) Representative: Rankin, Douglas  Marks & Clerk LLP Aurora 120 Bothwell Street Glasgow G2 7JS Glasgow G2 7JS (GB)