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Coiled tubing refers to a continuous length of small-diameter steel pipe and related surface equipment as well as associated drilling, completion and workover, or remediation, techniques. Coiled tubing oilfield technology was initially developed for working on live, producing wells. Coiled tubing technology is frequently used to deploy tools and materials through production tubing or casing while remedial work is performed on producing wells. Coiled tubing fulfills three key requirements for downhole operations on live wells by providing a dynamic seal between the formation pressure and the surface, a continuous conduit for fluid conveyance and a method for running this conduit in and out of a pressurized well. Coiled tubing strength and rigidity, combined with its capability to circulate treatment fluids, offer distinct advantages in workover operations. In addition to drilling and completion operations, oil and gas companies are using coiled tubing to help fish for lost equipment and for conveying well logging tools.
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