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Coiled tubing refers to metal piping, normally 1" to 2.875" in diameter, used for interventions in oil and gas wells and sometimes as production tubing in depleted gas wells, which comes spooled on a large reel. Coiled tubing is often used to carry out similar operations as wireline The main benefits over wireline are the ability to pump chemicals through the coil and the ability push it into hole rather than relying on gravity. However, for offshore operations the 'foot print' for a coiled tubing operation is generally larger than a wireline spread, which can limit the number of installations where coiled tubing can be performed and make the operation more costly. A coiled tubing operation is normally performed through the drilling derrick on the platform, which is used to support the surface equipment, although on platforms with no drilling facilities a self supporting tower can be used instead. For coiled tubing operations on sub-sea wells a semi-submersible has to be utilised to support all the surface equipment and personnel, where as wireline can be carried out from a smaller and cheaper intervention vessel. Onshore, they can be run using smaller service rigs, and for light operations a mobile self-contained coiled tubing rig can be used.
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