Company man. Thanks for your good comments. However, could you or someone else clarify a couple of things because I don’t understand how casing could run in dry.
- The shoe has a one-way check valve preventing mud back-flow into the bottom of the casing as it is lowered. so, when you say it plugged, what do you mean? It is plugged in one direction on purpose.
- The casing is periodically filled with mud as it is lowered (otherwise, it wouldn’t sink because of buoyancy). The mud would prevent any bubble from forming in the bottom of the casing unless perhaps the float collar was defective and blocked flow, which could cause air between the float collar and shoe. However, that would only be as much air as could fit in one 40-foot casing joint.
Really appreciate your help.