Delay explosion propagation device for multi-stage perforation detonation

The multi-stage perforation initiation device, designed with isolation mechanisms and electromagnetic linkage, solves the problem of inaccurate delay control in the downhole environment, realizes safe and reliable multi-stage perforation operations, and improves the safety and efficiency of downhole operations.

CN121701153AActive Publication Date: 2026-03-20DAQING JINXIANGYU SCI & TECH CO LTD
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Patent Information

Application Number
CN202610210108.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-13
Publication Date
2026-03-20
Estimated Expiration
2046-02-13

AI Technical Summary

Technical Problem

Existing multi-stage perforation detonation devices suffer from inaccurate delay control and insufficient safety in complex downhole environments. They are prone to premature detonation of perforation projectiles due to accidental triggering or pressure fluctuations, which affects operational safety and success rate.

Method used

The design employs a modular block structure within the isolation mechanism, achieving reliable isolation and connection of the firing pin through mechanical isolation and electromagnetic linkage, ensuring precise detonation under preset conditions; and utilizes pressure sensors and a closed-loop control system to monitor downhole pressure in real time, ensuring accurate timing of operations.

Benefits of technology

It achieves precise and reliable delay control in complex downhole environments, avoids false triggering, improves the safety and efficiency of perforation operations, and meets the stringent requirements of multi-stage perforation for timing control.

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Abstract

The invention discloses a delay explosion propagation device for multi-stage perforation detonation, relates to the technical field of multi-stage perforation, and aims at solving the technical problem that an existing delay explosion propagation device is insufficient in safety isolation in the delay waiting stage. The delay explosion propagation device comprises a gun body, a pressure sensor, a perforating bullet system, a detonation system and an isolation mechanism; the detonating system comprises an inner barrel connected into the gun body in a sleeved mode, a firing pin arranged in the inner barrel in a sleeved mode and provided with hydraulic drive, and a fire cap installed at the bottom of the inner barrel. Through gathering and unfolding of the combination blocks in the isolation mechanism, reliable separation and connection of the impact path of the firing pin are achieved, the firing pin can directly impact the fire cap to complete detonation only when the combination blocks are unfolded, the impact path is separated and cannot be detonated when the combination blocks are gathered, and therefore an active controllable mechanical safety isolation means is provided; the technical problems that an existing delay explosion propagation device is detonated in advance due to the fact that a firing pin accidentally impacts a fire cap due to false triggering or pressure fluctuation in the delay waiting period, and safety is insufficient are solved.
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