(19)
(11) EP 0 210 758 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.07.1989 Bulletin 1989/30

(43) Date of publication A2:
04.02.1987 Bulletin 1987/06

(21) Application number: 86305066.2

(22) Date of filing: 30.06.1986
(51) International Patent Classification (IPC)4: E21B 29/02, E21B 17/10
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 25.07.1985 GB 8518808

(71) Applicant: C-E VETCO UK LIMITED
Aberdeen, AB1 2SL Scotland (GB)

(72) Inventors:
  • Smetham, James Nigel
    Aberdeen AB1 9QL Scotland (GB)
  • Lazari, Lazaris
    Aberdeen Scotland (GB)

(74) Representative: Johnson, Terence Leslie et al
Edward Evans & Co. Chancery House 53-64 Chancery Lane
London WC2A 1SD
London WC2A 1SD (GB)


(56) References cited: : 
   
       


    (54) Apparatus for cutting a drill collar


    (57) Apparatus 1 for cutting a drill collar of a well casing, com. prising a housing 2 for an explosive charge to be located in a well casing adjacent a drill collar and means 3 to centralize the apparatus 1 in a well casing 4 over varying diameters thereof. Variations in casing diameter are shown at x and y.






    Search report