(19)

(11)

EP 1 841 947 A2

(12)

(88) Date of publication A3: 19.10.2006 (43) Date of publication: 10.10.2007 Bulletin 2007/41 (21) Application number: 05855055.9 (22) Date of filing: 21.12.2005

(51) International Patent Classification (IPC):  E21B 43/26(2006.01) (86) International application number: PCT/US2005/046431 (87) International publication number: WO 2006/069177 (29.06.2006 Gazette 2006/26)

(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: 21.12.2004 US 19694 21.12.2004 US 19757 21.12.2004 US 19748 (71) Applicant: CDX Gas, LLC Dallas, TX 75254-7672 (US)	(72) Inventor: ZUPANICK, Joseph A. Pineville, West Virginia 24874 (US) (74) Representative: Lawrence, John  Barker Brettell 138 Hagley Road Edgbaston Birmingham B16 9PW Birmingham B16 9PW (GB)