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If the well is producing when you run in with tools, the viscous drag caused by the flow may be enough to prevent you getting to the target depth. This is especially critical when there is a restriction in the tubing, for example a nipple. It may be perfectly possible to run in hole against the flow at all depths except at the restriction, where the tool clearance is smaller.

This result is presented as a message, rather than a graph. It tells you the maximum flowrate you can overcome with the current tool (adding weight may help), and at what depth it is brought to a halt.

It is worth remembering that the fluid drag on the cable (for wireline scenarios) often exceeds that on the toolstring. So it is possible for the tools to be in large diameter casing and in good shape, while cable compression is occuring higher up in smaller diameter tubing where the fluid velocity is higher.

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