(19)
(11) EP 1 278 939 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:
09.04.2014 Bulletin 2014/15

(45) Mention of the grant of the patent:
08.01.2014 Bulletin 2014/02

(21) Application number: 01925560.3

(22) Date of filing: 20.04.2001
(51) International Patent Classification (IPC): 
E21B 43/25(2006.01)
(86) International application number:
PCT/EP2001/004511
(87) International publication number:
WO 2001/083639 (08.11.2001 Gazette 2001/45)

(54)

WELL TREATMENT FLUIDS COMPRISING CHELATING AGENTS

BOHRLOCHBEHANDLUNGSFLÜSSIGKEITEN DIE CHELATBILDNER ENTHALTEN

FLUIDES DE TRAITEMENT DE PUITS CONTENANT DES AGENTS DE CHELATION

(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

(30) Priority: 03.05.2000 US 563557

(43) Date of publication of application:
29.01.2003 Bulletin 2003/05

(73) Proprietors:
  • Services Petroliers Schlumberger
    75007 Paris (FR)
    Designated Contracting States:
    FR 
  • Schlumberger Technology B.V.
    2514 JG The Hague (NL)
    Designated Contracting States:
    AT DE DK IT PT 
  • Schlumberger Holdings Limited
    Road Town, Tortola 1110 (VG)
    Designated Contracting States:
    GB NL 

(72) Inventor:
  • FRENIER, Wayne, W
    Katy, TX 77449 (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: : 
US-A- 3 660 287
US-A- 5 096 618
 US-A- 4 888 121
US-A- 5 972 868
   
       
    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).