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(11)

EP 1 792 050 A1

(12)

(43) Date of publication: 06.06.2007 Bulletin 2007/23 (21) Application number: 05787856.3 (22) Date of filing: 20.09.2005

(51) International Patent Classification (IPC):  E21B 43/38(2006.01) E21B 21/00(2006.01) (86) International application number: PCT/CA2005/001439 (87) International publication number: WO 2006/032141 (30.03.2006 Gazette 2006/13)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 20.09.2004 US 611111 P (71) Applicants: Trican Well Services Ltd. Calgary, Alberta T2P 4G8 (CA) Tempress Technologies, Inc. Kent, WA 98032 (US)	(72) Inventor: KOLLÉ, Jack Seattle, Washington 98199 (US) (74) Representative: Miller, James Lionel Woolverton et al Kilburn & Strode, 20 Red Lion Street London WC1R 4PJ London WC1R 4PJ (GB)