Wells – Processes – Cementing – plugging or consolidating
Reexamination Certificate
2007-10-31
2010-02-02
Dang, Hoang (Department: 3672)
Wells
Processes
Cementing, plugging or consolidating
C166S070000, C166S177400
Reexamination Certificate
active
07654325
ABSTRACT:
The present invention provides a method and apparatus for handling tubulars and drilling with tubulars such as casing into a formation. In one aspect of the invention, the apparatus comprises a circulating head and a cementing head operatively connectible to a gripping member. The circulating head is used to circulate drilling fluid while drilling with casing, and the cementing head is used to cement the casing string within the formation at a desired depth. The present invention also relates to methods and apparatus for isolating a tensile load from a drilling apparatus rotated by a top drive. In one aspect, the present invention provides a load isolator apparatus having an isolator body operatively connected to the top drive and a torque body at least partially disposed in the isolator body. In operation, the bearing assembly transfers the tensile load from the torque body to the isolator body.
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Allen John Timothy
Giroux Richard L.
Gray Kevin Leon
Shahin David
Snider Randy Gene
Dang Hoang
Patterson & Sheridan LLP
Weatherford / Lamb, Inc.
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