In wireline operations, small mistakes can lead to massive failures. I’ve seen situations where a simple miscommunication caused a wellhead valve to be closed mid-run, severing the logging cable and leading to an expensive fishing job. That’s why tagging out wellhead controls isn’t just an extra step—it’s a critical safety measure that ensures wireline and perforating operations run smoothly.

Why Tagging Out Well Head Controls is Crucial

During stage frac operations, multiple teams work simultaneously, increasing the risk of unintended actions. If a wellhead control is manipulated without coordination, it can:

• Cut the wireline, requiring downhole pipe recovery
• Cause pressure surges, damaging wireline pressure control equipment
• Disrupt perforation well operations, leading to delays and rework

By placing a clear and visible sign on the wellhead controls, everyone on site is immediately aware that wireline is in the well, reducing the chance of dangerous mistakes.

Best Practices for Tagging Out Well Head Controls

Before Wireline Operations Begin

• A designated supervisor places a conspicuous sign on the wellhead controls.
• The sign must state: “Wireline Cable in The Well – DO NOT CLOSE Except in Case of Emergency.”
• No wireline operations can begin until the sign is in place and acknowledged by the entire crew.

During Wireline Runs

• Radio silence must be observed from 250 feet and shallower to prevent accidental detonations when working with perforating guns.
• When coming out of the well, the tool trap must be closed at 1,000 feet, signaling that tools are nearing surface.
• A wireline engineer must notify the grease operator to ensure pressure control measures are followed.

Before Removing the Tag

• Wireline operations must be fully completed before any changes are made to the wellhead.
• The designated supervisor is the only one authorized to remove the sign after verifying that all tools are above the tool trap.
• The wireline engineer must confirm that the tools are bumped up and safe before allowing wellhead operations to resume.

Safety Indications for Wireline and Perforating

During wireline well logging, cased hole logging, and pump down perforating, visual and audio signals help ensure safety.

• Green light: The key is in the safe position, allowing operations to continue.
• Yellow strobe light and horn at 250 feet: Signals that radio silence is in effect.
• Red light: Indicates a fire or detonation situation—no surface operations should occur.

Wireline crews must not come to surface unless the green light is on and the yellow strobe light is flashing, ensuring that all safety conditions are met.

Key Takeaways for Wireline Safety

By implementing a strict tag-out procedure for wellhead controls, wireline service providers can prevent costly and dangerous mistakes. The best safety practices involve:

• Clear communication between all teams to avoid accidental wireline severing.
• Strict adherence to wellhead tag-out protocols to protect wireline equipment and downhole tools.
• Using visual and audio signals to maintain control in high-pressure environments.

A severed cable, a lost toolstring, or a downhole pressure issue—all of these problems can be avoided with one simple action: Tagging out the wellhead controls before wireline operations begin.