The 3) I believe would be Material Balance.
As the fluid flows to the top through the tubing it continuously sees pressure dropping. As the pressure drops at some point this pressure will enter the 2-Phase region of the fluid and condensate will be seen in the tubing at some depth on the way up. If the velocity of the fluid is lower than the drop out velocity, then you will see the condensate (liquid) drop down into the well and not make its way up to the surface. This will have a lot of heavy components of the GC which if not accounted for will cause errors. If this is happening then your surface measurements (PVT data) will not reflect what is really in your reservoir. The calculations will be wrong.
Look here
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