I think once the mud is flowing downhill they could begin lowering the pumping pressure then send down cement kind of like achieving balance against the formation pressure? just my 2cents.
Once they get enough mud in the well to overbalance the formation (stop any upward flow of well fluids) they will be able to pump in a big slug of cement and plug the thing off. If they don’t wait until that point the cement will likely be gas cut and will not work!
Once they get enough mud in the well to overbalance the formation (stop any upward flow of well fluids) they will be able to pump in a big slug of cement and plug the thing off. If they don’t wait until that point the cement will likely be gas cut and will not work!