One of the operations that is essential for a successful and cost effective coiled tubing sidetrack is the casing exit. Currently, two coiled tubing casing exit methods exist dependent on completion configuration; through non-restricted monobore completions and "thru-tubing" casing exits.

The monobore completion or liner is exited by setting a packer and orientated whipstock then running a traditional starting mill and window mill.

The thru-tubing whipstock, which typically is run through a 4-1/2" completion and set in 7" casing / liner, utilizes a hinged mechanism which cams into place in the casing. A new generation of mills is used to cut the window.

This paper will discuss specific equipment, procedures and applications employed in a number of case history wells located in Alaska and in the North Sea.

Keywords:
knowledge management, Coiled tubing operations, drilling operation, Upstream Oil & Gas, Exit Technique, Completion Installation and Operations, Worldwide Case history
Subjects:
Drilling Operations, Professionalism, Training, and Education, Information Management and Systems, Communities of practice, Knowledge management, Completion Installation and Operations, Coiled tubing operations
Copyright 1997, Society of Petroleum Engineers
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