07828085 is referenced by 4 patents and cites 7 patents.

A top drive system with a plurality of top drive modules, which are configured to be quickly exchanged. The top drive modules may include any or all of the following: a main body module, a gearbox module, a drive motor module, a pipe handler module, an upper fluid module, a lower well control valve module, a block interface module, a retract system interface frame module, a cooling system module, a work platform guard module, and a quill saver sub module. Alternatively, the top drive may comprise a first top drive and a second top drive which are configured to be quickly exchanged.

Title
Modular top drive
Application Number
11/613685
Publication Number
7828085 (B2)
Application Date
December 20, 2006
Publication Date
November 9, 2010
Inventor
Greg Kostiuk
Houston
TX, US
Alan S Richardson
The Woodlands
TX, US
Faisal J Yousef
Houston
TX, US
Randall S Pyrch
Montgomery
TX, US
Beat Kuttel
Spring
TX, US
Agent
Haynes and Boone
Assignee
Canrig Drilling Technology
TX, US
IPC
E21B 19/00
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