Ammunition and explosives – Blasting – Patterned blasting
Patent
1992-01-21
1993-06-29
Nelson, Peter A.
Ammunition and explosives
Blasting
Patterned blasting
102313, 175 456, 166 63, F42B 300
Patent
active
052236650
ABSTRACT:
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 intermediate 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.
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"Hammer Stop and Shock Block for Tubing Conveyed Perforating," High Pressure Integrity, Inc., New Orleans, La. (dated at last as early as Jul. 23, 1992) pp. 1-8.
J. V. Carisella, Sc.D. et al., "SPE #22556 Three New Systems Which Prevent Firing of Perforating Guns and String Shots on or Near the Surface," High Pressure Integrity, Inc., New Orleans, La. (presented for SPE publication Jul. 1991), pp. 1-24.
Burleson John D.
Klein Dieter
Halliburton Company
Nelson Peter A.
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