Direct Pressure Firing Heads
Features
Utilizes industry leading precision shear pins
Can be run on top or bottom of Hunting guns
Designed to API RP-67 (Oilfield Explosive Safety) guidelines
Redress kits
Simple, reliable and rugged design
Benefits
Precision shear pins guaranteed to actuate within 5% of calculations
Enhanced safety as difficult to detonate at surface or by electrical sources
Can be effectively utilized in very high underbalance environments
Compatible with all Hunting TCP firing systems
Redress kits allow for quick turnarounds
The Direct Pressure Firing Head is designed for well conditions that are not favorable for dropping a detonating bar or where a backup pressure firing head is desirable.
The firing head is assembled to actuate at a predetermined pressure by using precision shear pins. The firing piston is held within the retainer sleeve by these precision shear pins. The number of pins used is based on well conditions and desired safety factor.
Hydrostatic plus applied pressure is used to hydraulically actuate the firing head within ±5% of the calculated values. When the precision shear pins fail at the predetermined pressure, the firing piston drives the firing pin into the percussion initiator which in turn detonates the perforating gun assembly.
