(19)
(11) EP 0 339 774 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.05.1991 Bulletin 1991/19

(43) Date of publication A2:
02.11.1989 Bulletin 1989/44

(21) Application number: 89302337.4

(22) Date of filing: 09.03.1989
(51) International Patent Classification (IPC)4: E21B 43/1185
(84) Designated Contracting States:
DE FR GB IT NL

(30) Priority: 27.04.1988 US 186906
20.09.1988 US 248329

(71) Applicant: HALLIBURTON COMPANY
Duncan Oklahoma 73536 (US)

(72) Inventors:
  • Wesson, David S.
    Katy Texas 77492-1170 (US)
  • George Kevin R.
    Columbus Texas 78934 (US)

(74) Representative: Wain, Christopher Paul et al
A.A. THORNTON & CO. Northumberland House 303-306 High Holborn
London WC1V 7LE
London WC1V 7LE (GB)


(56) References cited: : 
   
       


    (54) Firing head for well perforating gun


    (57) A firing head assembly for a well bore perforating gun in which assembly alternative firing paths are provided. A first detonation cord (26) passes longitudinally through a generally cylindrical housing (11), providing a firing path from a firing head above the housing to a perforating gun below the housing. A firing pin (23) and second detonation cord (27) are located in the housing and are positioned radially offset from the longitudinal axis of the housing. Boosters (64,65) on the first and second detonation cords are positioned adjacent one another and opposite a third booster. Either or both of the first and second boosters may be used to fire the third booster. No splicing of detonation cords is required and the detonation cords are completely within a protective housing. The firing pin may be actuated by pressure or mechanical means.










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