| 摘要 |
The present invention generally relates to an apparatus and method for seali ng a tubular string. In one aspect, a drilling system is provided. The drilling system includes a rotating control head for sealing the tubular string while permitting axia l movement of the string relative to the rotating control head. The drilling system also includes an actuating fluid for actuating the rotating control head and maintaining a pressure differential between a fluid pressure in the rotating control head and a wellbore pressure. Additionally, the drilling system includes a cooling medium for passing through the rotating control head. In another aspect, a rotating control hea d is provided. In yet another aspect, a method for sealing a tubular in a rotatin g control head is provided.
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