(19)
(11) EP 2 938 804 A1

(12)

(43) Date of publication:
04.11.2015 Bulletin 2015/45

(21) Application number: 13868680.3

(22) Date of filing: 27.12.2013
(51) International Patent Classification (IPC): 
E21B 10/26(2006.01)
E21B 10/32(2006.01)
(86) International application number:
PCT/US2013/078078
(87) International publication number:
WO 2014/106102 (03.07.2014 Gazette 2014/27)
(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: 27.12.2012 US 201261746372 P
26.12.2013 US 201361921050 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 
  • Mahajan, Manoj, D.
    Houston, TX 77054 (US)
  • Brietzke, Daniel, W.
    Spring, TX 77386 (US)
  • Fuller, Nathan
    Spring, TX 77373 (US)
  • Barnhouse, James
    Houston, TX 77008 (US)
  • Ishak, Georges
    Houston, TX 77077 (US)

(72) Inventors:
  • MAHAJAN, Manoj, D.
    Houston, TX 77054 (US)
  • BRIETZKE, Daniel, W.
    Spring, TX 77386 (US)
  • FULLER, Nathan
    Spring, TX 77373 (US)
  • BARNHOUSE, James
    Houston, TX 77008 (US)
  • ISHAK, Georges
    Houston, TX 77077 (US)

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

   


(54) UNDERREAMER FOR INCREASING A BORE DIAMETER