Cementing through coiled tubing is not a new service line. However, it remains one that has received little technical attention. In reality, there is a great deal of science behind the successful execution of such cementing operations. Failure to understand the complexities of cement placement in a well can lead to catastrophic failure, including the loss of the coiled tubing, the entire well, or both. This paper outlines the techniques behind cementing through coiled tubing, illustrating the pitfalls and suggesting best operating procedures. The issues covered are: - 1When to use cement darts. 2 How to land cement darts. 3 How to manage liquid freefall. 4 How to clean up cement. 5 What should the displacement/contaminant fluid be? 6 What are the best nozzles? 7 Slurry design.
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