(19)

(11)

EP 2 004 945 A2

(12)

(88) Date of publication A3: 06.12.2007 (43) Date of publication: 24.12.2008 Bulletin 2008/52 (21) Application number: 07734008.1 (22) Date of filing: 12.03.2007

(51) International Patent Classification (IPC):  E21B 7/02(2006.01) E21B 19/22(2006.01) (86) International application number: PCT/IB2007/000670 (87) International publication number: WO 2007/105101 (20.09.2007 Gazette 2007/38)

(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 MT NL PL PT RO SE SI SK TR (30) Priority: 15.03.2006 US 375927 (71) Applicant: Xtreme Coil Drilling Corp. Calgary, AB T2P 2V6 (CA)	(72) Inventors: WOOD, Thomas, D. Calgary, Alberta, T2Z 3P4 (CA) HAVINGA, Richard, D. Okotoks, Alberta T1S 1A2 (CA) (74) Representative: Schupfner, Georg  Müller Schupfner & Partner Patentanwälte Parkstrasse 1 21244 Buchholz 21244 Buchholz (DE)