(19)

(11)

EP 2 526 257 A1

(12)

(43) Date of publication: 28.11.2012 Bulletin 2012/48 (21) Application number: 10705226.8 (22) Date of filing: 10.02.2010

(51) International Patent Classification (IPC):  E21B 33/14(2006.01) E21B 17/02(2006.01) E21B 17/20(2006.01) E21B 17/00(2006.01) E21B 17/10(2006.01) E21B 41/00(2006.01) (86) International application number: PCT/US2010/023690 (87) International publication number: WO 2011/090491 (28.07.2011 Gazette 2011/30)

(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 MK MT NL NO PL PT RO SE SI SK SM TR (30) Priority: 19.01.2010 US 689787 (71) Applicant: Frank's International, Inc. Houston, TX 77042 (US)	(72) Inventor: BUYTAERT, Jean, P. Texas 76067 (US) (74) Representative: Dowling, Andrew  Haseltine Lake LLP Lincoln House, 5th Floor 300 High Holborn GB-London WC1V 7JH GB-London WC1V 7JH (GB)