(19)
(11) EP 1 915 506 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:
10.04.2013 Bulletin 2013/15

(45) Mention of the grant of the patent:
13.02.2013 Bulletin 2013/07

(21) Application number: 06775057.0

(22) Date of filing: 02.08.2006
(51) International Patent Classification (IPC): 
E21B 23/08(2006.01)
E21B 23/14(2006.01)
 E21B 19/02(2006.01)
(86) International application number:
PCT/CA2006/001270
(87) International publication number:
WO 2007/014465 (08.02.2007 Gazette 2007/06)

(54)

CASING BOTTOM HOLE ASSEMBLY RETRIEVAL PROCESS

VERFAHREN ZUM RÜCKHOLEN EINER BOHRLOCHANORDNUNG DURCH EIN FUTTERROHR

PROCEDE D'EXTRACTION D'ENSEMBLE DE FOND DE SONDAGE D'UNE COLONNE DE TUBAGE

(84) Designated Contracting States:
DK FR GB

(30) Priority: 02.08.2005 US 595745 P
26.07.2006 US 820407 P

(43) Date of publication of application:
30.04.2008 Bulletin 2008/18

(73) Proprietor: Tesco Corporation
Calgary, Alberta T2H 2B7 (CA)

(72) Inventors:
  • ANGMAN, Per G.
    Calgary, Alberta T2H 2B7 (CA)
  • TESSARI, Robert M.
    Calgary, Alberta T2H 2B7 (CA)
  • WARREN, Tommy M.
    Coweta, Oklahoma 74429 (US)

(74) Representative: Gahlert, Stefan et al
Witte, Weller & Partner Patentanwälte Postfach 10 54 62
70047 Stuttgart
70047 Stuttgart (DE)


(56) References cited: : 
US-A- 3 656 552
US-A- 4 384 616
US-A- 5 181 571
US-A1- 2003 066 650
 US-A- 4 133 396
US-A- 5 083 609
US-A- 5 186 265
   
       
    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).