METHODS, DEVICES AND SYSTEMS OF ELECTRONIC TIME DELAY Russian patent published in 2012 - IPC F42C11/06 F42D1/04 

FIELD: blasting.

SUBSTANCE: perforation system in a well comprises an electronic unit of time delay, including an input assembly, an electronic circuit of time delay, and an output assembly. The input assembly is activated by external control action, at the same time its element is displaced for activation of the electronic time delay circuit. The electronic circuit of time delay comprises a time delay device connected to a circuit of firing voltage. The electronic time delay circuit counts time delay, and after its completion it increases voltage, until the specified threshold voltage of firing is exceeded. After the threshold voltage of firing is exceeded, the trigger device switch shall be punched to transfer energy to an electric device with an initiating charge for initiation of an additional charge detonator in an output assembly. The additional charge detonator develops output of blasting energies to blast the next element of the explosive substance or propellant, such as a group of cumulative charges in the perforation system in the well.

EFFECT: increased reliability and flexibility of the well perforation system, high level of reliability at low price level and reduced complexity of manufacturing.

34 cl, 13 dwg