(19)
(11) EP 2 864 576 A1

(12)

(43) Date of publication:
29.04.2015 Bulletin 2015/18

(21) Application number: 13806487.8

(22) Date of filing: 20.06.2013
(51) International Patent Classification (IPC): 
E21B 21/08(2006.01)
E21B 47/008(2012.01)
(86) International application number:
PCT/US2013/046678
(87) International publication number:
WO 2013/192365 (27.12.2013 Gazette 2013/52)
(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: 22.06.2012 US 201261663240 P

(71) Applicants:
  • Services Pétroliers Schlumberger
    75007 Paris (FR)

    FR 
  • Schlumberger Holdings Limited
    Tortola, British Virgin Islands 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:
  • RINGER, Maurice
    Cambridge Cambridgeshire CB5 8HS (GB)
  • LIU, Qiuhua
    Sugar Land, Texas 77479 (US)
  • WONG, Richard V.C.
    Houston, Texas 77055 (US)
  • DUNLOP, Jonathan
    Cambridge Cambridgeshire CB4 1PX (GB)
  • GZARA, Kais
    Tunis 1013 (TN)
  • COOPER, Iain
    Sugar Land, Texas 77479 (US)

(74) Representative: Li, Boxi 
Schlumberger Cambridge Research Limited Intellectual Property Law High Cross Madingley Road
Cambridge CB3 0EL
Cambridge CB3 0EL (GB)

   


(54) DETECTING A DRILL STRING WASHOUT EVENT