(19)
(11) EP 2 188 484 A1

(12)

(43) Date of publication:
26.05.2010 Bulletin 2010/21

(21) Application number: 08788277.5

(22) Date of filing: 12.08.2008
(51) International Patent Classification (IPC): 
E21B 7/06(2006.01)
E21B 17/10(2006.01)
(86) International application number:
PCT/GB2008/002706
(87) International publication number:
WO 2009/022115 (19.02.2009 Gazette 2009/08)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA MK RS

(30) Priority: 15.08.2007 US 839381
07.05.2008 US 116408
07.05.2008 US 116444
07.05.2008 US 116390
07.05.2008 US 116380

(71) Applicants:
  • Schlumberger Technology B.V.
    2514 JG The Hague (NL)

    BG CZ DE DK GR HU IE IT LT NO PL RO SI SK TR 
  • Schlumberger Holdings Limited
    Road Town, Tortola (VG)

    GB NL 
  • Services Pétroliers Schlumberger
    75007 Paris (FR)

    FR 
  • Prad Research And Development Limited
    Tortola (VG)

(72) Inventors:
  • JOHNSON, Ashley
    Milton Cambridgeshire CB24 6DG (GB)
  • ALDRED, Walter
    Thriplow Hertfordshire SG8 7RJ (GB)
  • DOWNTON, Geoffrey
    Minchinhampton Gloucestershire GL6 9BY (GB)
  • BOUALLEG, Riadh
    Cambridge CB4 2AE (GB)
  • HAUGVALDSTAD, Kjell
    7125 Vanvikan (NO)
  • SHEPPARD, Michael
    Hadstock Cambridgeshire CB21 4NU (GB)

(74) Representative: Ford, Michael Frederick 
Schlumberger Cambridge Research Limited High Cross Madingley Road
Cambridge CB3 0EL
Cambridge CB3 0EL (GB)

   


(54) SYSTEM AND METHOD FOR CONTROLLING A DRILLING SYSTEM FOR DRILLING A BOREHOLE IN AN EARTH FORMATION