E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/116 (2006.01) E21B 43/1185 (2006.01)
Patent
CA 2087628
ABSTRACT OF THE INVENTION A method and apparatus adapted to disable the actuation assembly for a perforating gun or any other detonation device used in subterranean wells to prevent premature surface detonation of the device. An apparatus is provided which can be quickly and easily connected in a tubing string inter- mediate the firing head and the perforating gun or other detonation device. In a preferred embodiment, the invention comprises a cylinder and firing piston combination wherein a chamber is provided between the cylinder wall and the firing piston. The chamber contains a transition material, such as an eutectic alloy. The transition material changes state from a solid to a fluid when the temperature of the material is increased above the material's "melting temperature." The transition material changes back from a fluid to a solid when the temperature of the material is decreased below the material's "melting temperature." When the transition material is in a solid state, as it is at the surface, movement of the firing piston is prevented by the shear strength of the solid transition material. When the transition material is in a fluid state, as it is at the requisite depth downhole, movement of the firing piston is not significantly inhibited due to the decreased shear strength of the fluid transition material. When the firing head is detonated at the requisite depth downhole, the pressure from the firing head detonation is sufficient to urge the firing piston forward, detonating the perforating gun or other detonation device.
Burleson John D.
Klein Dieter
Haliburton Company
Swabey Ogilvy Renault
LandOfFree
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