(19)
(11) EP 0 184 377 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.12.1987 Bulletin 1987/49

(43) Date of publication A2:
11.06.1986 Bulletin 1986/24

(21) Application number: 85308616

(22) Date of filing: 27.11.1985
(84) Designated Contracting States:
DE FR GB IT NL

(30) Priority: 27.11.1984 US 675163

(71) Applicant: HALLIBURTON COMPANY
 ()

(72) Inventors:
  • George, Flint Raymond
     ()
  • Smith, Marlin Ray
     ()

   


(54) Borehole devices disarmed by fluid pressure


(57) An apparatus (10) for actuating an explosive device downhole in a borehole includes a mechanism for actuating the explosive device in response to a stimulus, and means for disarming the actuating means in response to the application of fluid pressure thereto. The actuating means can be actuated by a pressure differential across a piston (122) causing movement thereof and of rod (120) to release firing pin (86). In such case, the disarming means includes a valved port (232) operable by sliding movement of sleeve 64 to equalize pressure across piston (122). Sleeve 64 is moveable in response to certain pressure conditions.










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