- Corrosion
(of tubing and other wellbore assembly elements)
- Fishing
(of dropped and accidentally lost downhole tools)
- Obstruction
(of inflow into the well)
- Valve Failure
(of safety and regulatory/gaslift valves in the nipples or tubing-pockets)
- Scale
(barite and other chemical scaling in the borehole during oil production)
- Leakage
(due to isolation and fitting problems, or faulty seals)
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Leakage in wells