(19)

(11)

EP 1 546 505 A2

(12)

(88) Date of publication A3: 25.03.2004 (43) Date of publication: 29.06.2005 Bulletin 2005/26 (21) Application number: 03793194.6 (22) Date of filing: 21.08.2003

(51) International Patent Classification (IPC)7: E21B 43/00, E21B 43/14, E21B 43/30 (86) International application number: PCT/US2003/026124 (87) International publication number: WO 2004/018835 (04.03.2004 Gazette 2004/10)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR Designated Extension States: AL LT LV MK (30) Priority: 22.08.2002 US 227057 (71) Applicant: CDX Gas, LLC Dallas, TX 75254-7687 (US)	(72) Inventor: ZUPANICK, Joseph, A. Pineville, WV 24874 (US) (74) Representative: Lawrence, John  Barker Brettell,138 Hagley Road,Edgbaston Birmingham B16 9PW Birmingham B16 9PW (GB)