Coupling for drilling-with-casing operations

Details Coupling for drilling-with-casing operations Coupling for drilling-with-casing operations

2008-03-25

2008-03-25

Dunwoody, Aaron (Department: 3679)

Pipe joints or couplings

Screw

C285S333000

Reexamination Certificate

active

11117990

ABSTRACT:
A modified API Buttress threaded casing connection is disclosed for use in drilling oil and gas wells in lieu of using conventional drill pipe. The coupling threads only are multiple tapered yet can be mated with standard API Buttress pin threads having a single taper. The coupling is also shortened to permit abutment of the mating pins at the center of the coupling and can be further enhanced with an integral, sacrificial wear sleeve on one end of the coupling.

REFERENCES:
patent: 3994516 (1976-11-01), Fredd
patent: 4445727 (1984-05-01), Funk
patent: 4522431 (1985-06-01), Reimert
patent: 4588213 (1986-05-01), Bollfrass et al.
patent: 5212885 (1993-05-01), Buonodono et al.
patent: RE34467 (1993-12-01), Reeves
patent: 6893057 (2005-05-01), Evans
patent: 2005/0011643 (2005-01-01), Slack et al.

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