07325610 is referenced by 73 patents and cites 836 patents.

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.

Title
Methods and apparatus for handling and drilling with tubulars or casing
Application Number
10/795129
Publication Number
7325610 (B2)
Application Date
March 5, 2004
Publication Date
February 5, 2008
Inventor
Randy Gene Snider
Houston
TX, US
John Timothy Allen
Katy
TX, US
Kevin Leon Gray
Friendswood
TX, US
Gary Thompson
Katy
TX, US
Adrian Vuyk Jr
Houston
TX, US
David Shahin
Houston
TX, US
Richard L Giroux
Cypress
TX, US
Agent
Patterson & Sheridan
Assignee
Weatherford Lamb
TX, US
IPC
E21B 33/14
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