(19)

(11)

EP 2 438 268 A2

(12)

(88) Date of publication A3: 03.03.2011 (43) Date of publication: 11.04.2012 Bulletin 2012/15 (21) Application number: 10783816.1 (22) Date of filing: 26.05.2010

(51) International Patent Classification (IPC):  E21B 47/00(2012.01) G01P 3/48(2006.01) E21B 47/02(2006.01) (86) International application number: PCT/US2010/036165 (87) International publication number: WO 2010/141282 (09.12.2010 Gazette 2010/49)

(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 SE SI SK SM TR (30) Priority: 02.06.2009 US 183371 P (71) Applicant: Baker Hughes Incorporated Houston, TX 77210-4740 (US)	(72) Inventors: TRINH, Tu Tien Houston Texas 77072 (US) SULLIVAN, Eric Houston Texas 77089 (US) (74) Representative: Jeffrey, Philip Michael  Dehns St Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)