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(11)

EP 2 880 260 A1

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(43) Date of publication: 10.06.2015 Bulletin 2015/24 (21) Application number: 13825213.5 (22) Date of filing: 01.08.2013

(51) International Patent Classification (IPC):  E21B 44/00(2006.01) E21B 47/08(2012.01) G01V 1/40(2006.01) (86) International application number: PCT/US2013/053129 (87) International publication number: WO 2014/022614 (06.02.2014 Gazette 2014/06)

(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: 01.08.2012 US 201261678451 P (71) Applicants: Services Pétroliers Schlumberger 75007 Paris (FR) FR  Schlumberger Holdings Limited Road Town, Tortola 1110 (VG) GB NL  Schlumberger Technology B.V. 2514 JG The Hague (NL) AL AT BE BG CH CY CZ DE DK EE ES FI GR HR HU IE IS IT LI LT LU LV MC MK MT NO PL PT RO RS SE SI SK SM TR

(72) Inventors: FRANGOS, Michalis Cambridge Cambridgeshire CB3 0EL (GB) RINGER, Maurice Cambridge Cambridgeshire CB3 0EL (GB) (74) Representative: Li, Boxi  Schlumberger Cambridge Research Limited Intellectual Property Law High Cross Madingley Road Cambridge CB3 0EL Cambridge CB3 0EL (GB)