Automatic release firing head (AFH)
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Triggering the tubing type jet perforators in the wells filled with water, oil or other drilling fluid and their automatic release after initiating. The firing head is designed for the tubing with the inside diameter not less than 55 mm (the AFH is initiated by the ball) and the inside diameter not less than 62 mm (the AFH is initiated by the drill stem or the pressure).
The firing head is compatible with the perforating systems PKO 73-AT, PKO 89-AT, PKO 102-AT, PKO 114-AT in a firing circuit beginning with a percussion initiator PI BVT or another device similar to the PI in its susceptibility to detonation.
| Characteristics | Initiating by the drill stem BVT131.300.000-03 | Initiating by the ball BVT131.300.000-04 | Initiating by the pressure BVT131.300.000-05 | |
|---|---|---|---|---|
| Length, mm | 538 | 580 | 598(628)* | |
| Ball diameter, mm | 56 | - | - | |
| AFH outer diameter, mm | 93 | 93 | 93 | |
| Firing head weight, kg | 14.6 | 15.4 | 17.4(17.5)* | |
| Weight of the blasting explosive, max*, g | 1.0 | 1.0 | 1.0 | |
| Minimum hydrostatic pressure ensuring reliable operation of PI BVT, MPa | 5 | 5 | - | |
| Pin shear pressure, MPa | - | - | 3.6 | |
| Max number of pins, pcs | - | - | 24 | |
| Min hydrostatic operating pressure for two steel pins, MPa | - | - | 7.2 | |
| Deviation of actuation pressure from the design pressure, % | - | - | ±5 | |
| Actuation pressure injected by the unit into the well to initiate the perforation system top assembly, MPa | - | - | +7 | |
| Max drift diameter after releasing the perforation system, mm | 62 | 55 | 62 | |
| Firing head lifetime | 1 shot | 1 shot | 1 shot | |
| Max carrying capacity | 30 | 30 | 30 | |
| Maximum torque transmitted through AFH from tubing to the perforating system, N*m | 800 | 800 | 800 | |
* When using a nozzle BVT 132.300.005-07
Advantages and features:
- increased handling safety provided by the design of the firing head;
- reliability provided by the design of the head and the percussion initiator PI BVT;
- workability after a long exposure to high pressure and temperature;
- efficient operation in the wells of any curvature: vertical, horizontal and directional;
- possibility of flushing the well and possibility of formation fluid entering the tubing after perforation;
- the possibility of extracting the device from the tubing cavity for well logging and (or) hydraulic fracturing after initiating the perforator and its automatic release;
- protection against tubing rotation.