Downhole drill string having a collapsible subassembly and...

Details Downhole drill string having a collapsible subassembly and... Downhole drill string having a collapsible subassembly and...

2007-11-27

2007-11-27

Mai, Lanna (Department: 3637)

Boring or penetrating the earth

Processes

C175S305000, C175S300000, C175S321000, C175S325300, C166S301000

Reexamination Certificate

active

10521346

ABSTRACT:
A method and apparatus for allowing a downhole drill string to be stuck at one location and continue to rotate above the stuck section. The apparatus provides a method for collapsing the stuck subassembly by reducing its outside diameter. Simultaneous with the subassembly collapse, a jarring action is initiated from within the drill string to further loosen the stuck sections. At the same time drilling fluid inside the string is allowed to circulate outside the string through a circulation sub. The fluid is forced around the stuck subassembly further increasing the likelihood that the subassembly will be freed.

REFERENCES:
patent: 4842082 (1989-06-01), Springer
patent: 5931239 (1999-08-01), Schuh
patent: 6082457 (2000-07-01), Best et al.

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