Tortuosity and String Weights

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Tortuosity and String Weights

I am doing two separate studies at the moment and wondered if anyone would have any input?

1) What is the cost of "hugging the line" in Directional wells? - talking about extra tortuosity and time in sliding. Not interested in people pitching RSS systems and friction breaking tools - just the pure cost in quantative terms of a client telling you to stay close to the line as opposed to letting the BHA do its thing and correct accordingly in wider arcs.

2) String weights and buoyancy forces - what is the impact of force-balance equations at changes of diameter in BHAs, and what is the impact on traditional bouyancy calculations?

These are not commercial questions - so not interested in knowing how blue tools do better than red ones - just technical stuff please.