This paper analyzes representative samples of downhole and surface measurements collected during a sidetrack operation with a coiled tubing drilling unit. The downhole data are classified into operational windows such as drill ahead, running in hole and pulling out of hole. They are correlated with drilling reports and surface measurements of hook load, pumping pressures, flow rates, and slackoff. Correlations between the surface and downhole data are used to understand force transmission during set-down, pick-up and drilling operations.

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