Engineered specifically for downhole environments where drop-bar detonation is unfeasible or a backup pressure-triggered initiation system is needed, this firing head activates at a preset pressure via precision shear pins. The firing piston is held in place within the retainer sleeve by these pins, with the quantity tailored to match well conditions and required safety margins. Hydraulic activation—driven by a combination of hydrostatic and applied pressure—ensures the device operates within ±5% of its calculated pressure threshold. When the precision shear pins fracture at the designated pressure, the firing piston drives the firing pin into the percussion initiator, triggering detonation of the perforating gun assembly.
