(19)

(11)

EP 2 153 011 A1

(12)

(43) Date of publication: 17.02.2010 Bulletin 2010/07 (21) Application number: 08743686.1 (22) Date of filing: 05.03.2008

(51) International Patent Classification (IPC):  E21B 7/18(2006.01) (86) International application number: PCT/US2008/055895 (87) International publication number: WO 2008/144096 (27.11.2008 Gazette 2008/48)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 16.05.2007 US 930403 P (71) Applicant: TerraWatt Holdings Corporation Powell, WY 82433 (US)	(72) Inventor: CURLETT, Harry, B. Cody, WY 82414-9225 (US) (74) Representative: Stump, Beat  Stump & Partner AG Patentanwälte AG Dufourstrasse 116 8008 Zürich 8008 Zürich (CH)