(19)

(11)

EP 1 859 120 A1

(12)

(43) Date of publication: 28.11.2007 Bulletin 2007/48 (21) Application number: 04739051.3 (22) Date of filing: 03.07.2004

(51) International Patent Classification (IPC):  E21B 7/20(2006.01) (86) International application number: PCT/EG2004/000026 (87) International publication number: WO 2005/098193 (20.10.2005 Gazette 2005/42)

(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 PL PT RO SE SI SK TR (30) Priority: 10.04.2004 EG 20040165 (71) Applicant: ROSHDY, Osama Kamal El-Sayed Zagazig (EG)	(72) Inventor: ROSHDY, Osama Kamal El-Sayed Zagazig (EG) (74) Representative: Viering, Jentschura & Partner  Postfach 22 14 43 80504 München 80504 München (DE)