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(11)

EP 2 627 859 A2

(12)

(88) Date of publication A3: 16.05.2013 (43) Date of publication: 21.08.2013 Bulletin 2013/34 (21) Application number: 11773946.6 (22) Date of filing: 11.10.2011

(51) International Patent Classification (IPC):  E21B 33/038(2006.01) E21B 43/013(2006.01) E21B 17/01(2006.01) E21B 36/00(2006.01) E02D 27/04(2006.01) E21B 17/08(2006.01) (86) International application number: PCT/US2011/055693 (87) International publication number: WO 2012/051148 (19.04.2012 Gazette 2012/16)

(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 (30) Priority: 13.10.2010 US 392899 P 08.06.2011 US 201113156258 12.10.2010 US 392443 P (71) Applicant: BP Corporation North America Inc. Houston, TX 77079 (US)

(72) Inventors: SHILLING, Roy Naperville, IL 60563 (US) KENNELLEY, Kevin Naperville, IL 60563 (US) FRANKLIN, Robert, W. Naperville, IL 60563 (US) CORSO, Vicki Naperville, IL 60563 (US) BALLARD, Adam, L. Naperville, IL 60563 (US) THETHI, Ricky Naperville, IL 60563 (US) NGUYEN, Chau Naperville, IL 60563 (US) HATTON, Steve Naperville, IL 60563 (US) (74) Representative: Hamer, Christopher K. et al Mathys & Squire LLP 120 Holborn London EC1N 2SQ London EC1N 2SQ (GB)