Apparatus for selectively actuating well tools
Patent 5052489 Issued on October 1, 1991. Estimated Expiration Date: 
June 15, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 15, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1380049 2363234 2961958 3517757 3517758 Thermal-magnetic switch Patent #: 4169999 InventorsApplicationNo. 538840 filed on 06/15/1990US Classes:166/297, Perforating, weakening, bending or separating pipe at an unprepared point166/55, MEANS FOR PERFORATING, WEAKENING, BENDING OR SEPARATING PIPE AT AN UNPREPARED POINT337/145Multiple contact or plural circuit control meansExaminersPrimary: Britts, Ramon S.Assistant: Schoeppel, Roger J. Attorney, Agent or FirmForeign Patent References
International ClassE21B 043/11AbstractIn the representative embodiments of the several methods and apparatus of the invention disclosed herein, a movable detonating member is arranged to be selectively impelled against an impact-responsive detonator on a well tool having one or more explosive devices. The movable detonating member is initially restrained from moving in relation of the tool body by a heat-responsive material which, in one embodiment, is operative to release the detonating member when an electrical heater on the tool is initiated from the surface for melting the bonding material or, in another embodiment, releases the detonating member when the material is melted by elevated well bore temperatures. Other safety measures disclosed herein include temperature-sensitive barriers which, in one embodiment, prevents the movement of the detonating member against the explosive detonator until the material in the barrier is changed by elevated well bore temperatures as well as a second embodiment that precludes the transmission of detonating forces from the detonator and other explosives in the train of explosives on the tool.Field of SearchMEANS FOR PERFORATING, WEAKENING, BENDING OR SEPARATING PIPE AT AN UNPREPARED POINTWITH ELECTRICAL MEANS Perforating, weakening, bending or separating pipe at an unprepared point Perforating, weakening or separating by mechanical means or abrasive fluid Multiple contact or plural circuit control means Independent firing of plural charges Explosive charge carried by projectile Directing successive projectiles or charges in same path With position orienting or indicating Firing chamber movable in bore relative to carrier or another firing chamber With bore condition firing control, or compensating means Firing control mechanically actuated in bore Concave-shaped charge WITH HEAT DISSIPATING PROJECTIONS (E.G., VANES) PLURAL RESISTANCE ELEMENTS CONNECTED BY A JUMPER OR SPACER | |
