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AFH

Automatic release firing head (AFH) designed for triggering of the shaped charge perforators deployed in the tubing, with inner diameter at least of 62 mm (if triggered by ball), and automatic drop of perforator to the bottom in vertical and deviated wells with water, oil or other washing fluid.

The head is compatible with PKO89-AT, PKO102-AT and PKO114-AT perforator with transverse dimensions of 89, 102 and 114 mm respectively; firing chain starts from DYNAWELL HNS percussion initiator or device with similar detonation sensitivity.

Specifications and advantages:

  • perforator can be released during firing and GWL (geophysical well logging) and (or) following HFF (hydraulic formation fracturing);
  • improved safety of operation provided by the head design;
  • reliable operation provided by the head and percussion initiator design;
  • can be used after continuous exposure to high pressure and temperature;
  • well bore can be washed, and formation fluid enters the tubing after perforation;
  • can be used in vertical, horizontal and deviated wells;
  • device can be extruded from tubing to perform GWL after perforator triggering and auto release;
  • HFF can be performed without well killing immediately after PEW.

Specifications

Parameter

Head type

Drop bar
triggering

Ball triggering

Drop bar
triggering

Ball triggering

Drop bar
triggering

Ball triggering

Value

1

Triggered perforating system

PKO89-AT

PKO102-AT

PKO114-AT

2

External diameter B, mm

89

102

114

3

Drift diameter D, mm

62

55

62

55

62

55

4

Length L, mm

474*

519*

474*

519*

474*

519*

5

Weight of the head, kg

12,6*

12,7*

12,6*

12,7*

12,6*

12,7*

6

Weight of blasting explosive, maximum, g

1,0**

7

Minimum hydrostatic pressure, MPa

5

8

Maximum hydrostatic pressure, MPa

80

9

Maximum temperature in application,  °С

150

10

Available salvos

1 charge

11

Type of the tubing

NKT73 (tubing)

12

Maximum bearing capacity, t

30

13

Maximum torque transmitted via GWL from tubing to PKO, N x m

800

14

Maximum well deviation angle, up to °

45

90

45

90

45

90

* - without consideration of the upper adapter;
** - together with DYNAWELL HNS 1.4S percussion initiator.

Equipment after being released