E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/13
E21B 43/118 (2006.01) E21B 43/1185 (2006.01)
Patent
CA 1281277
Abstract of the Disclosure A detonator bar has an outer housing, an inner housing connected to the outer housing by at least one first fran- gible member, an explosive charge disposed in the inner housing, and a firing piston with firing pin held in the inner housing by at least one retaining dog and at least one second frangible member. Operation occurs in response to a relatively small impact force between the detonator bar and a perforator or other explosive object located in a subter- ranean well. This relatively small impact breaks the at least one first frangible member. Thereafter, a fluid pres- sure existing in the subterranean well, such as a hydrosta- tic pressure within a tubing string on which a perforator is conveyed, is used to exert a sufficient force to break the at least one second frangible member after the at least one retaining dog has been released by downward movement of the outer housing relative to the inner housing, which relative movement occurs only after the initial impact force has bro- ken the at least one first frangible member.
543581
George Flint R.
George Kevin R.
Haugen David M.
Luke Robert R.
Wesson David S.
Haliburton Company
Swabey Ogilvy Renault
LandOfFree
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