IMPROVED COUPLING FOR DRILLING-WITH-CASING OPERATIONS

Title:

IMPROVED COUPLING FOR DRILLING-WITH-CASING OPERATIONS

Document Type and Number:

WIPO Patent Application WO/2005/108848

Kind Code:

A2

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.

Inventors:

GEARY GEORGE B
MANNELLA EUGENE J

Application Number:

PCT/US2005/015127

Publication Date:

November 17, 2005

Filing Date:

April 29, 2005

Export Citation:

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Assignee:

GB TUBULARS INC (US)
GEARY GEORGE B
MANNELLA EUGENE J

International Classes:

E21B17/042; E21B17/08; F16L15/06; F16L15/08; F16L25/00; (IPC1-7): F16L25/00

Foreign References:

US5212885A	1993-05-25
USRE34467E	1993-12-07

Attorney, Agent or Firm:

Keirs, Christopher D. (Cabello Lutsch, Rutherford & Brucculeri, L.L.P., Suite 600, 20333 SH 24, Houston TX, US)

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