Description
Perforation Wireline Gun
Technical Description
The Wireline Perforating Gun is a hollow-carrier steel tube designed to transport shaped charges into the wellbore and detonate them at a specific depth. These guns are the primary tool for creating a flow path between the hydrocarbon reservoir and the wellbore casing.
Hollow Carrier Technology: The carrier is manufactured from high-tensile, heat-treated alloy steel. This “scalloped” or plain-walled tube contains the explosive energy and debris within the gun body, protecting the casing from damage and ensuring the gun can be easily retrieved after firing.
Explosive Configuration: Charges are secured in an internal “loading strip” or “tube.” The detonation sequence is initiated by a detonating cord that runs the length of the gun, ensuring all charges fire nearly simultaneously at a predetermined Phase (e.g.,60 deg or 90 deg).
Environmental Sealing: Each gun is equipped with high-temperature O-ring seals at the Top and Bottom Subs to maintain an internal atmospheric pressure environment. This is critical for the shaped charges to form a high-velocity “jet” capable of penetrating steel casing and rock.
Debris Management: By retaining the charge cases and primary explosive residue inside the carrier, these guns minimize the risk of leaving junk in the hole, which is essential for future well intervention.
Standard Gun Specifications (Imperial Units)
The following table covers standard sizes up to 3-3/8″ OD, commonly used for cased-hole completions.
| Gun OD (in) | Pressure Rating (psi) | Temp Rating (°F) | Shot Density (SPF) | Available Lengths (ft) |
| 1 -11/16″ | 15,000 to 20,000 | 400 | 4, 6 | 1.5 to 20 |
| 2″ | 15,000 to 20,000 | 400 | 4, 6 | 1.5 to 20 |
| 2-1/8″ | 15,000 to 20,000 | 400 | 4, 6 | 2 to 20 |
| 2-3/4″ | 15,000 to 20,000 | 400 | 4, 5, 6 | 2 to 20 |
| 2-7/8″ | 15,000 to 25,000 | 400 | 4, 6, 8 | 2 to 20 |
| 3-1/8″ | 15,000 to 20,000 | 400 | 4, 6, 12 | 2 to 20 |
| 3-3/8″ | 20,000 to 25,000 | 400 | 4, 6, 12 | 2 to 20 |
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