This manual has been prepared to complement the information provided through the presentations and discussions held during a Schlumberger Dowell Coiled Tubing Client School. The technical information within this manual is intended to provide a basic understanding of the equipment, tools, processes and design requirements associated with modern coiled tubing operations. Comprehensive and detailed information, such as that required to safely and successfully complete the design and execution of coiled tubing operations, may not be included. Consequently, it is recommended that the local Dowell representative be consulted during the feasibility or design preparation phase of any coiled tubing operation.