Wells – Above ground apparatus – With seal for reciprocating member
Reexamination Certificate
2006-05-09
2006-05-09
Bagnell, David (Department: 3672)
Wells
Above ground apparatus
With seal for reciprocating member
C166S084200, C277S333000
Reexamination Certificate
active
07040394
ABSTRACT:
The present invention generally relates to an apparatus and method for sealing 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 axial 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 head is provided. In yet another aspect, a method for sealing a tubular in a rotating control head is provided.
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U.K. Search Report, Application No. GB 0325423.2, dated Feb. 2, 2004.
Bailey Thomas F.
Chambers James
Hannegan Don M.
Bagnell David
Patterson & Sheridan LLP
Stephenson Daniel P.
Weatherford / Lamb, Inc.
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