06854533 is referenced by 63 patents and cites 330 patents.

The present invention generally relates to a method and an apparatus for drilling with casing. In one aspect, a method of drilling a wellbore with casing is provided, including placing a string of casing with a drill bit at the lower end thereof into a previously formed wellbore and urging the string of casing axially downward to form a new section of wellbore. The method further includes pumping fluid through the string of casing into an annulus formed between the casing string and the new section of wellbore. The method also includes diverting a portion of the fluid into an upper annulus in the previously formed wellbore. In another aspect, a method of drilling with casing to form a wellbore is provided. In yet another aspect, an apparatus for forming a wellbore is provided. In still another aspect, a method of casing a wellbore while drilling the wellbore is provided.

Title
Apparatus and method for drilling with casing
Application Number
10/325636
Publication Number
6854533 (B2)
Application Date
December 20, 2002
Publication Date
February 15, 2005
Inventor
David J Brunnert
Houston
TX, US
Gregory G Galloway
Conroe
TX, US
Agent
Moser Patterson & Sheridan L
Assignee
Weatherford Lamb
TX, US
IPC
E21B 047/01
G05B 019/418
G05B 019/4068
E21B 007/20
E21B 007/20
E21B 010/32
E21B 010/60
E21B 023/00
E21B 007/20
E21B 019/00
E21B 010/66
E21B 043/10
E21B 007/06
E21B 019/16
E21B 019/16
E21B 019/16
E21B 019/16
E21B 023/00
E21B 023/00
E21B 004/18
E21B 017/14
E21B 033/14
E21B 007/06
E21B 007/20
E21B 007/18
E21B 007/06
E21B 007/20
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