First, Are you really sure you want to do this? This sounds like a bad idea.
If you really want to know the required torque then friction is far more significant than moment of inertia. Well deviation almost always exists. If you can find the torque during drilling when bit was not on bottom...
Typical BOP stacks may have a double ram plus a annular. The Koomey/accumulator/closing unit needs to have a station for each set of rams plus the annular. Three stations. There are many different BOP configurations therefore the number of units needs to match the number of units to control...
There are retrievable, drillable and permanent bridge plugs to name a few. Retrievable plugs are typically steel with mechanisms to set and release the plug. Drillables are typically made of cast iron so they can be drilled. There are also bridge plugs made of composite materials.
The website...
