Top drive with shaft seal isolation

摘要: A top drive system for wellbore operations, the including a main shaft having an upper seal with raised platform supporting system, and, in one aspect, shroud covering or seals. In contaminants flow down from seals since are by platform. This abstract is provided to comply rules requiring which will allow searcher other reader quickly ascertain subject matter of technical disclosure. It submitted understanding that it not be used interpret limit scope meaning claims, 37 C.F.R. 1.72(b).