903 Well Site Completion and Servicing Safety

Snubbing

Snubbing is a process used to insert or remove a tubing string from a wellbore while the well remains under pressure. This method allows work to be performed without killing the well, which helps maintain reservoir pressure and production efficiency.

A specialized snubbing rig is used to control the movement of the tubing. The rig includes a snubbing unit that applies hydraulic force to push or pull the tubing against the well's pressure. The tubing may be run in or pulled out using hydraulic jacks, and the equipment is designed to seal around the pipe to keep pressure contained.

When snubbing is done on a live well—meaning the well is still pressurized and flowing—it is known as a hydraulic workover. This type of work is used for many tasks, such as replacing damaged tubing, installing new equipment, or clearing blockages inside the well.

Snubbing operations are complex and require highly trained crews. Hazards include high-pressure equipment, heavy loads, pinch points, and the risk of sudden pressure release. All workers involved must follow safety procedures and wear appropriate personal protective equipment (PPE).

The special service supervisor should hold a pre-job meeting with the special service crew and other involved personnel to review responsibilities and to coordinate the operations to be performed.

Potential Hazards

Possible Solutions

• Ensure proper fall protection.
• Inspect and maintain all pressure control equipment prior to operations.
• Provide adequate means of access to and exit from the basket.
• Provide emergency escape methods.
• Rig all equipment should be in accordance with equipment recommendations.
• Ensure proper body and hand placement.

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