| 摘要 |
An explosive pipe cutter assembly (10, 10') has a housing (20, 20') which defines at its closed end a hemispherical shaped nose end (22, 22') and contains a toroidal shaped charge (48) comprised of two half-charges (42). Toroidal shaped charge (48) has a seating surface (31) seated on a support shoulder (50, 50') adjacent the closed end of the housing (20, 20'), and a trailing end which is engaged by a retaining ring (38) received in the open end (24, 24') of the housing (20, 20'). Two juxtaposed half-liners (28) provide a liner having an apex (A) which is curved in longitudinal cross section to increase the mass of the metal formed into a penetrating jet by detonation of the shaped charge (48). The hemispherical shape of the nose end (22, 22') of the housing (20, 20') provides increased pressure resistance for a given wall thickness and material of construction, and is better able to navigate past obstacles while being lowered through a well than are conventional flat-nose housings.
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