1. The document classifies gun systems by size and assembly, with the main size categories being through-tubing guns, tubing punchers, and casing guns. 2. It describes the characteristics and applications of different gun system types, including through-tubing guns, tubing punchers, carrier guns like HSD and scallop guns, and exposed guns like Enerjet. 3. The document notes the advantages and disadvantages of various gun systems, such as HSD guns having high shot densities but expensive expandable carriers, and Enerjet having the advantage of underbalanced perforating but disadvantages like debris and requiring slower running speeds.

1. February-2001
GUN SYSTEMS
Classification by size & assembly
Advantages & Disadvantages

2. 2 Gun Systems
Classification by SIZE
1. Through-tubing
– Small guns to pass
through the tubing string
2. Tubing Punchers
– Very small guns to punch
tubing to allow fluid
circulation
3. Casing guns
– Larger guns with big
charges
– Usually shot overbalance
– HSD type: more shots per
foot
Tubing
Casing
Tubing
Punchers are
shot here
Packer
Casing guns
are shot here

3. 3 Gun Systems
1. Through-Tubing Guns
Upper Head
Link
Lower Head/Nose
Nobel Detonator
60 - gr/ft Rilsan
Detonator Cord
Phased Enerjet Charge
Charge Retainer
Strip
Lower Head/Nose
Pivot Gun
2-1/8 in. Phased Enerjet Gun

4. 4 Gun Systems
2. Tubing Punchers
40 gr/ft Lead
Detonating Cord
1-11/16 in. Domed
Scallop Carrier
1/4 in. Water
Mild Steel
Block
•Designed to
perforate one pipe
with out damaging
adjacent one

5. 5 Gun Systems
3. Casing Guns
High-Efficiency Gun
System (HEGS)
High-Shot Density
Gun (HSD)
Port-Plug Gun (PPG)

6. 6 Gun Systems
Classification by ASSEMBLY
1. Carrier guns
• HSD
• Tubing Punchers
• Scallop Guns
• HEGS
• Port Plug Guns
2. Exposed guns
• Enerjet
• Pivot Gun which detonator
to use ??

7. 8 Gun Systems
HSD - High Shot Density Guns
•Advantages
– High Shot Densities (5 up to 27 spf)
– Shot Phasing (45o, 60o, 72o, 135o, 140o,
and 180o)
– Self-aligning Detonation Transfer Modules
– Bottom-up and Top-down firing modes
– Exclusive Use of Secondary Explosives
• Disadvantages
– Cost of expandable carriers

8. 12 Gun Systems
Enerjet - Advantages and Disadvantages
• Advantages:
– Underbalanced perforating for clean up and increased
productivity
– Available in 0o, 45o, 60o and 90o phasing
• Disadvantages:
– Debris
– Must position against casing
– Explosives exposed to well environment
– Slower running speeds required
– Selectivity (1) switch
– Use of Scotchloks limited to 280oF in exposed
conditions

9. 14 Gun Systems
Guns Types in Summary
HEGS Thru-Tubing
HSD gun