In wireline and perforating operations, handling explosive devices is a critical aspect of maintaining well integrity and ensuring safe perforation well execution. I once witnessed an incident where a worker attempted to remove a port plug from a switch sub, unaware of the trapped pressure inside. The force of the ejected plug caused serious injury. This scenario underscores why only trained wireline service providers should handle explosive devices retrieved from a well.

Recognizing the Signs of Trapped Pressure

Explosive devices should always be treated as though they contain trapped pressure, regardless of their appearance. Some warning signs include:

• Hissing or bubbling sounds from shot holes or connections
• Difficulty unscrewing gun connections
• Debris protruding from shot holes

Ignoring these indicators in wireline perforating operations can lead to uncontrolled pressure release, posing risks to personnel and equipment.

Best Practices for Breaking Down Perforating Guns

To prevent injury and equipment damage, wireline companies must follow strict procedures when breaking down perforating guns:

• Do not remove port plugs during the breakdown process.
• Break the gun apart at the tandem, keeping the port plug intact.
• If a port plug must be removed, secure the sub in a vice with the plug facing away from the body.
• If trapped pressure is suspected, move the gun away from personnel and allow it to sit for two hours before rechecking.
• If pressure remains after two hours, notify management immediately.

These steps ensure safer cased hole wireline operations while reducing the likelihood of wireline pressure control equipment failures.

Why Only Trained Personnel Should Handle Explosive Devices

A fundamental rule in wireline perforating is that only trained personnel should handle explosive devices. Allowing untrained workers to assist in gun breakdown significantly increases the risk of injury. In the incident I witnessed, a non-wireline worker attempted to assist in breaking down a shot perforating gun—an oversight that led to an avoidable accident.

To maintain safety in cased hole well services, wireline control systems should be operated exclusively by qualified personnel who understand perforating gun handling protocols.

Final Thoughts on Explosive Device Safety in Wireline Operations

Safety is the backbone of every wireline logging and perforation services job. Wireline service companies must enforce strict protocols for handling explosive devices, ensuring that only trained personnel are responsible for their operation. Recognizing trapped pressure signs, following proper breakdown methods, and keeping non-wireline personnel out of high-risk zones will significantly reduce accidents and ensure smooth wireline services oil and gas operations.