Method and apparatus for adding a tubular to drill string...

Details Method and apparatus for adding a tubular to drill string... Method and apparatus for adding a tubular to drill string...

2004-08-16

2010-06-01

Thompson, Kenneth (Department: 3672)

Boring or penetrating the earth

With means movable relative to tool below ground to stop...

Stops flow by movement about fixed pivot

C175S317000, C175S318000, C166S316000, C166S373000, C137S515000, C137S605000

Reexamination Certificate

active

07726418

ABSTRACT:
Apparatus and a method for adding and removing tubulars whilst containing the pressure within a drill string and/or maintaining circulation of drilling fluid down a drill string using a diverter sub which is able to open up to mud flow from a side mud port and close off the flow of mud from above the drill string with or without continuous rotation of the drill string.

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patent: WO 03/025334 (2003-03-01), None

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