DETONATOR FOR WELL EQUIPMENT Russian patent published in 2008 - IPC E21B43/1185 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil, gas producing and mining industries and can be employed at perforating works in wells. The detonator for well equipment incorporates case with an axial step channel having in its upper portion a diameter bigger, than in its lower portion, piston fixed in the axial channel with a bigger diameter in its end upper position, shutter of the axial channel positioned in the zone of transition of the axial channel from one diameter to another and forming with the piston a pressure tight chamber filled with gas or gas mixture in its sub-piston space, charge of blasting explosive (BE) partially filling the lower portion of the channel under the shutter and device for unfixing of the piston. At that the detonator is designed to impulse compression in the sub-piston space of gas or gas mixture due to the said impulse compression by 200-500 times in comparison with their initial pressure, then there follows heating of gas or gas mixture to temperature 20-40% above the temperature of charge of BE ignition, shear of the shutter in one of the lower positions of the piston, acceleration of the shear fragment of the shutter to a speed facilitating generation of a shock wave in the charge of BE able to cause its detonation and perform the detonation proper of the charge of BE by means of combination with the wave action to the charge of BE with a heat effect of the heated fragment of the shutter, heated gas or mixture of gases and mechanical effect with the said fragment of the shutter.

EFFECT: increased service life and upgraded efficiency of detonators actuation.

14 cl, 1 dwg