(19)

(11)

EP 2 710 410 A2

(12)

(88) Date of publication A3: 24.01.2013 (43) Date of publication: 26.03.2014 Bulletin 2014/13 (21) Application number: 12789555.5 (22) Date of filing: 21.05.2012

(51) International Patent Classification (IPC):  G01V 3/15(2006.01) G01V 3/38(2006.01) G01V 3/36(2006.01) (86) International application number: PCT/US2012/038751 (87) International publication number: WO 2012/162208 (29.11.2012 Gazette 2012/48)

(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: 20.05.2011 US 201113112869 09.12.2011 US 201161568655 P 19.04.2012 US 201213450477 (71) Applicants: Schlumberger Technology B.V. 2514 JG The Hague (NL) AL BG CZ DE DK GR HU IE IT LT NO PL RO SI SK TR  Services Pétroliers Schlumberger 75007 Paris (FR) FR  Schlumberger Holdings Limited Tortola 1110 (VG) GB NL  Prad Research And Development Limited Tortola 1110 (VG) AL AT BE BG CH CY EE ES FI HR IS LI LU LV MC MK MT PT RS SE SK SM  Schlumberger Technology Corporation Sugar Land, TX 77478 (US) IS  Geco Technology B.V. 2586 BJ S'Gravenhage (NL)

(72) Inventors: HOPPERSTAD, Jon-Fredrik Cambridge Cambridgeshire CB1 2AX (GB) LAWS, Robert Cambridge Cambridgeshire CB4 1AJ (GB) TULETT, John, Richard Kanagawa 222-0022 (JP) (74) Representative: Ford, Michael Frederick  Schlumberger Cambridge Research Limited High Cross Madingley Road Cambridge CB3 0EL Cambridge CB3 0EL (GB)