Snubbing
Snubbing is the control of a tubing string while running it in or out of a well bore under pressure. A snubbing rig is used to conduct this operation. When snubbing is performed while the well is under pressure, it's called "hydraulic workover". See the image to the right.
Hydraulic workover snubbing operation.
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
- falling from heights
- being exposed to an unexpected release of pressure, and loss of well control
- being burned by a fire and explosion
- having limited ingress and egress
- working in an unstable basket due to lack of guy wires
- being caught between the rig assist pull down and crows nest
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.
Knowledge Check Choose the best answer for the question.
6-10. Why is it important to have all required guy lines installed when conducting snubbing operations?
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