(19)

(11)

EP 2 904 183 A1

(12)

(43) Date of publication: 12.08.2015 Bulletin 2015/33 (21) Application number: 13843704.1 (22) Date of filing: 24.09.2013

(51) International Patent Classification (IPC):  E21B 10/38(2006.01) (86) International application number: PCT/US2013/061341 (87) International publication number: WO 2014/055287 (10.04.2014 Gazette 2014/15)

(84) Designated Contracting States: AL 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 RS SE SI SK SM TR Designated Extension States: BA ME (30) Priority: 02.10.2012 US 201261709063 P (71) Applicant: Varel International, Ind., L.P. Carrollton, TX 75006 (US)	(72) Inventor: KING, William W. Houston, TX 77069 (US) (74) Representative: Hunt-Grubbe, Henry  Gill Jennings & Every LLP The Broadgate Tower 20 Primrose Street London EC2A 2ES London EC2A 2ES (GB)