Ignition control circuit of downhole electric detonator for perforation

Abstract

The invention discloses an ignition control circuit of a downhole electric detonator for perforation. The ignition control circuit comprises a wide-input-range power supply voltage stabilizing circuit, a signal detection and processing circuit and an ignition selecting switch circuit, wherein the wide-input-range power supply voltage stabilizing circuit is used for stabilizing voltage and then outputting direct current of 10V and direct current of 5V when direct current of 20-40V is input to a downhole ignition control circuit by a ground system through a single-core cable, so as to supply power to the signal detection and processing circuit and an ignition switch circuit; the signal detection and processing circuit is used for receiving ignition control commands from the ground system, controlling the connection / disconnection of the ignition selecting switch circuit according to the commands and controlling the detonation of the electric detonator; the ignition selecting switch circuit is used for being connected with the electric detonator. The ignition control circuit has the advantages that the circuit access of the downhole electric detonator during detonation can be realized safely and reliably, meanwhile, the detonation circuit access of the electric detonator resulting from accidental circuit conduction can be prevented, and the effect of protecting and igniting a detonation circuit can also be exerted under the extreme cases that the detonation circuit is short-circuited.

Description

[0001] technical field [0002] The invention relates to the technical field of electric detonator ignition control technology in downhole cluster control perforation. Cluster control perforation is a perforation technology that can realize low cost and high benefit in the exploitation of unconventional natural gas (shale gas, etc.), and belongs to Field of oil and gas well perforating instruments. Background technique [0003] In the exploitation of unconventional natural gas, because the shale gas reservoir is thin, the reservoir is numerous and discontinuous, when using the conventional tubing transmission perforation and cable transmission perforation, the perforating gun needs to be lifted and lowered many times, which has a large workload and high cost. Therefore, a perforation technology that can realize low-cost and high-efficiency oil and gas well development is needed. Clustered perforation technology came into being under this background. This technology uses a s...

AI Technical Summary

Problems solved by technology

[0006] 1. In actual use, the coded grading perforation meter cannot reliably connect to the downhole electric detonator, and the electric detonator is often detonated due to accidental conduction of the circuit and connected to the ignition circuit, resulting in misperforation engineering accidents

[0007] 2. After the electric detonator detonates the perforating gun, the perforating gun breaks and pours into the well fluid, which will cause a short circuit

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