(19)

(11)

EP 2 035 657 A2

(12)

(88) Date of publication A3: 27.11.2008 (43) Date of publication: 18.03.2009 Bulletin 2009/12 (21) Application number: 07809739.1 (22) Date of filing: 19.06.2007

(51) International Patent Classification (IPC):  E21B 47/00(2006.01) (86) International application number: PCT/US2007/014421 (87) International publication number: WO 2007/149507 (27.12.2007 Gazette 2007/52)

(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 Designated Extension States: AL BA HR MK RS (30) Priority: 19.06.2006 US 471370 (71) Applicant: Frank's International, Inc. Houston TX 77042 (US)	(72) Inventors: KAMPMAN, Rolf N. 1788 GR Den Helder (NL) SCHMIDT, Hans A. 31789 Hameln (DE) (74) Representative: Leeming, John Gerard  J.A. Kemp & Co. 14 South Square Gray's Inn London WC1R 5JJ London WC1R 5JJ (GB)