Formerly coiled tubing (CT) was used mainly for well workover in a narrow technological niche: post-frac well clean-out and stimulation treatment. In recent years due to the increased drilling of horizontal wells, CT has been used for geophysical well logging, perforation jobs, and underbalanced CT drilling.

During such jobs online monitoring of the down-hole parameters is the main requirement for the performance of operations. The quality of the performance of CT operations depends on the cable communication line which is set up if the logging cable is lodged in the coiled tubing. The logging cable is loaded at the CT manufacturing plant as well as by means of special equipment or during production operations.

The logging cable is loaded into the coiled tubing during the following operations: equipping of the CT with a new cable; replacement of the cable if damaged; removal/loading of the cable from/into the CT in case of CT damage with subsequent maintenance.

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