(19)

(11)

EP 2 158 379 A2

(12)

(88) Date of publication A3: 15.01.2009 (43) Date of publication: 03.03.2010 Bulletin 2010/09 (21) Application number: 08769366.9 (22) Date of filing: 09.05.2008

(51) International Patent Classification (IPC):  E21B 17/10(2006.01) E21B 43/10(2006.01) (86) International application number: PCT/US2008/063163 (87) International publication number: WO 2008/144249 (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 749544 26.07.2007 US 828943 (71) Applicant: Frank's International, Inc. Houston TX 77042 (US)	(72) Inventors: BUYTAERT, Jean Mineral Wells, TX 76067 (US) MILLER, Eugene, Edward Weatherford, TX 76086 (US) MCDOWELL, Donald, Elwin Millsap, TX 76066 (US) (74) Representative: Meacock, Andrew et al Haseltine Lake LLP Lincoln House, 5th Floor 300 High Holborn GB-London WC1V 7JH GB-London WC1V 7JH (GB)