Since this is a procedure routinely used in virtually all oil wells, I think we can assume that the guys who formulate the "mud" know how to handle it, even if we don't.
And we already know from measurements taken after the BOP was successfully shut in with the pressure cap that the reservoir pressure is remaining very constant.
If all else fails, 0 will give them advice as how to proceed. This in prolly not the site peoples first Rodeo. Like the MSM, the posters are predicting disaster.
barbra ann