Hydraulic firing head on absolute pressure (HFH)
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Triggering the tubing type jet perforators in the wells filled with water, oil or other drilling fluid.
The firing head is compatible with the perforating systems PKO 63-AT, 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. The firing head is activated mechanically (hydraulicly).
JSC “BVT” supplies the following types of firing heads:
Non-drained (initiated by tubing pressure, without the connection between the tubing and the annulus before and after HFH operation):
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BVT131.200.000-22 is designed to initiate PKO63-AT, PKO73-AT, PKO89-AT, PKO102-AT, PKO114-AT for the works on NKT-60;
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BVT131.200.000-25 is designed to initiate PKO63-AT, PKO73-AT, PKO89-AT, PKO102-AT, PKO114-AT for the works on NKT-73 (video only).
Drained, non-flow-through (initiated by tubing pressure, after the operation the tubing is connected with the annulus):
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BVT131.200.000-20 is designed to initiate PKO63-AT, PKO73-AT, PKO89-AT, PKO102-AT, PKO114-AT for the works on NKT-60;
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BVT131.200.000-23 is designed to initiate PKO63-AT, PKO73-AT, PKO89-AT, PKO102-AT, PKO114-AT for the works on NKT-73 (video only);
Drained, flow-through (initiated by tubing pressure generated when the HFH circulation holes are sealed by pumping the ball; there is the connection between the tubing cavity and the annulus initially):
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BVT131.200.000-21 is designed to initiate PKO63-AT, PKO73-AT, PKO89-AT, PKO102-AT, PKO114-AT for the works on NKT-60;
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BVT131.200.000-24 is designed to initiate PKO63-AT, PKO73-AT, PKO89-AT, PKO102-AT, PKO114-AT for the works on NKT-73;
| Characteristics | Drained, flow-through BVT131.200.000-24 | Drained, flow-through BVT131.200.000-21 | Drained, non-flow-through BVT131.200.000-23 | Drained, non-flow-through BVT131.200.000-20 | Non-drained BVT131.200.000-25 | Non-drained BVT131.200.000-22 | |
|---|---|---|---|---|---|---|---|
| Ball diameter, mm | 35 | 35 | - | - | - | - | |
| Weight, kg for PKO73 | 13.4 | 13.3 | 13.7 | 13.7 | 12.2 | 11.8 | |
| Actuation pressure injected by the unit into the well to initiate the perforation system middle (lower) assembly (two-layout scheme), MPa | +6 to hydrostatic pressure | +6 to hydrostatic pressure | +6 to hydrostatic pressure | +6 to hydrostatic pressure | +6 to hydrostatic pressure | +6 to hydrostatic pressure | |
| Actuation pressure injected by the unit into the well to initiate the perforation system top assembly (single-layout scheme), MPa | +7 to hydrostatic pressure | +7 to hydrostatic pressure | +7 to hydrostatic pressure | +7 to hydrostatic pressure | +7 to hydrostatic pressure | +7 to hydrostatic pressure | |
| Maximum hydrostatic operating pressure, MPa | 80 | 80 | 80 | 80 | 80 | 80 | |
| Min hydrostatic operating pressure, MPa | 5 | 5 | 5 | 5 | 5 | 5 | |
| Pin shear pressure**, MPa | 2.6 | 2.6 | 2.6 | 2.6 | 2.6 | 2.6 | |
| Weight, kg for PKO89,102,114 | 14.8 | 14.7 | 15 | 15.1 | 13.5 | 13.2 | |
| Weight, kg for PKO63 | 14 | 13.8 | 14.1 | 14.2 | 12.7 | 12.3 | |
| Weight of the blasting explosive, max*, g | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | |
| Length, mm for PKO89, PKO102,PKO114 | 526 | 526 | 526 | 526 | 480 | 460 | |
| Length, mm for PKO63, PKO73 | 545 | 545 | 545 | 545 | 499 | 479 | |
| Coupling outer diameter, mm for PKO89,102,114 | 89 | 89 | 89 | 89 | 89 | 89 | |
| Coupling outer diameter, mm for PKO73 | 76 | 76 | 76 | 76 | 76 | 76 | |
| Coupling outer diameter, mm for PKO63 | 76 | 76 | 76 | 76 | 76 | 76 | |
| Deviation of actuation pressure from the design pressure, % | ±5 | ±5 | ±5 | ±5 | ±5 | ±5 | |
| Max number of pins, pcs | 36 | 36 | 36 | 36 | 36 | 36 | |
| Firing head lifetime, min, shots | 5*** | 5*** | 5*** | 5*** | 5*** | 5*** | |
*The blasting explosive in the percussion initiator UD BVT. The percussion initiator UD BVT is not included in the scope of delivery and shall be ordered separately.
** The minimum number of pins to be installed at the minimum hydrostatic operating pressure (5 MPa) is 5 pcs.
*** In case of operation in a well with an aggressive environment, the firing head resource can be reduced down to one shot. After each shooting, check the surfaces under the sealing rings to determine if the head can be used further.
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 creating depression in the hydraulic system of the well and the reservoir, if necessary;
- possibility of perforating two intervals or one double-density interval in one trip;
- possibility of acid treatment, well flushing, reservoir testing after perforation.