there are two different OOS conditions for the DLS. There is a difference if you rotate or not => rotating bending moments or static bending moments. Just take a paper clip and apply static bending - then move your hands up and down with that bending and apply rotating bending - it will twist off very soon.
So you should have got two different limits from the coring service.
8½ HT 30 coring BHAs from Baker Hughes have the following limits: sliding DLS 4.2Â°/10m and 1.7Â°/10m rotating.
Yes given per 10m the TDS ! So 12.6Â°/30m sliding and 5.1Â°/30m rotating. You can order the coring service fro Baker Hughes :-)
Apart from that also the rotating limitation on the thread of DCs (and Jar as well) do not allow to rotate through 6Â°/30m on the whipstock. So in case you need to drill out across the whipstock pick up an RSS with motor above and do not turn the string from surface and as well use HWDPs instead of DCs in case you need to rotate the string from surface across the whipstock.
The 6Â°/30m on the whipstock sounds a bit low as well - go and check the drawing for the whip stock and I bet (a box of beer) that it is more than 6Â°/30m when you take inclination out and ramp start and end (not whipstock length please). There are very short Sii whipstocks around with even 30Â°/30m DLS.
In case you need to core just below the whipstock I would order a different whip stock. Using a motor above coring BHA is too much weight below bearing of motor and would demand too much TQ as well.
How long is the rat hole planned to be drilled with the milling BHA from the whipstock ?
Making the coring BHA less stiff and leave out the fullgauges stabilzers all 9m could help as well (but BHA will not hold inclination then) and rotating with minimum RPM from surface to reduce bending moments.
Calculation of bending moments across BHA is part of the standrad procedures in Baker Hughes (INTEQ).
working in the moment in Stavanger Statoil office for East Africa deep water exploration.