(19)
(11) EP 2 010 623 B8

(12) CORRECTED EUROPEAN PATENT SPECIFICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 B1)

(48) Corrigendum issued on:
26.12.2012 Bulletin 2012/52

(45) Mention of the grant of the patent:
07.11.2012 Bulletin 2012/45

(21) Application number: 07735477.7

(22) Date of filing: 11.04.2007
(51) International Patent Classification (IPC): 
C09K 8/68(2006.01)
 C09K 8/74(2006.01)
(86) International application number:
PCT/IB2007/051312
(87) International publication number:
WO 2007/119211 (25.10.2007 Gazette 2007/43)

(54)

RHEOLOGY ENHANCERS

RHEOLOGIEVERBESSERER

MODIFICATEURS DE RHÉOLOGIE

(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

(30) Priority: 13.04.2006 US 279622

(43) Date of publication of application:
07.01.2009 Bulletin 2009/02

(73) Proprietors:
  • Services Pétroliers Schlumberger
    75007 Paris (FR)
    Designated Contracting States:
    FR 
  • Schlumberger Holdings Limited
    Road Town, Tortola (VG)
    Designated Contracting States:
    GB NL 
  • Schlumberger Technology B.V.
    2514 JG The Hague (NL)
    Designated Contracting States:
    BG CZ DE DK GR HU IE IT LT PL RO SI SK TR 
  • PRAD Research and Development N.V.
    Willemstad, Curacao (AN)
    Designated Contracting States:
    AT BE CH CY EE ES FI HU IS LI LU LV MC MT PT SE 

(72) Inventors:
  • CHEN, Yiyan
    Sugar Land, Texas 77479 (US)
  • LEE, Jesse C.
    F-75015 Paris (FR)
  • LI, Fang
    Pleasanton, California 94588 (US)
  • DAHANAYAKE, Manilal
    Princeton Junction, New Jersey 08550 (US)
  • TILLOTSON, Robert
    Toms River, New Jersey 08755 (US)
  • COLACO, Allwyn
    South RIBER, New Jersey 08882 (US)

(74) Representative: Fortt, Simon Merton 
Schlumberger Cambridge Research Ltd IPL High Cross, Madingley Road
Cambridge, Cambridgeshire CB3 0EL
Cambridge, Cambridgeshire CB3 0EL (GB)


(56) References cited: : 
WO-A-2004/057155
WO-A-2005/118743
US-A1- 2006 185 842
 WO-A-2005/071038
US-A1- 2006 111 248
   
       
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).