(19)
(11) EP 0 834 643 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:
09.05.2007 Bulletin 2007/19

(45) Mention of the grant of the patent:
28.03.2007 Bulletin 2007/13

(21) Application number: 97307658.1

(22) Date of filing: 29.09.1997
(51) International Patent Classification (IPC): 
E21B 23/02(2006.01)
E21B 47/024(2006.01)
 E21B 29/06(2006.01)

(54)

Method and apparatus for drilling and re-entering multiple lateral branches in a well

Verfahren und Vorrichtung zum Bohren von und zum Wiedereinfahren in Lateralbohrungen

Procédé et dispositif pour forer et rentrer dans des branches latérales multiples d'un puits

(84) Designated Contracting States:
DE FR GB IT NL

(30) Priority: 01.10.1996 US 27241 P
22.01.1997 US 35425 P
29.04.1997 US 44422 P
24.09.1997 US 937032

(43) Date of publication of application:
08.04.1998 Bulletin 1998/15

(73) Proprietors:
  • Anadrill International SA
    Panama City (PA)
    Designated Contracting States:
    DE GB IT NL 
  • SERVICES PETROLIERS SCHLUMBERGER
    75007 Paris (FR)
    Designated Contracting States:
    FR 

(72) Inventors:
  • Nitis, Spyros S.
    Missouri City, TX 77459 (US)
  • Ohmer, Herve
    Houston, TX 77079 (US)
  • Gotlib, Mikhail V.
    Houston, TX 77096 (US)

(74) Representative: Macquet, Christophe et al
Schlumberger Cambridge Research Ltd, High Cross, Madingley Road
Cambridge CB3 0EL
Cambridge CB3 0EL (GB)


(56) References cited: : 
WO-A-93/05266
WO-A-96/23953
US-A- 4 304 299
US-A- 4 921 044
US-A- 5 375 659
 WO-A-95/33910
US-A- 4 153 109
US-A- 4 497 371
US-A- 5 154 231
US-A- 5 429 187
   
       
    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).