Title:
TUBULAR CONNECTION
Document Type and Number:
WIPO Patent Application WO1999008034
Kind Code:
A9
Abstract:
The tubular connection (10) includes a pin member (16) having external tapered threads (20) extending from a pin nose (29) to a pin base (23) and box member (18) having internal tapered threads (32) extending from a box base (33) to a box nose (34). The tapered threads are square or near square threads having a stab (50, 60) and load (70, 72) flanks with accommodating grooves. The stab flanks (50, 60) have corner chamfers (52, 62) which engage upon stabbing the pin member (16) into the box member (18). The corner chamfers (52, 62) increase the clearances between the threads and grooves and guide the crests (58, 68) to the root (59, 69) openings upon relative rotation of the pin (16) and box (18) members. The stab flanks (50, 60) may have an increased thread width at the thread pitch line forming cam flanks which cam the threads into the grooves. The crests (58, 68) and roots (59, 69) of the threads interferingly engage.
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Inventors:
BANKER EDWARD O (US)
KLEMENTICH ERICH F (US)
KLEMENTICH ERICH F (US)
Application Number:
PCT/US1998/016609
Publication Date:
April 29, 1999
Filing Date:
August 10, 1998
Export Citation:
Assignee:
MARUBENI TUBULARS INC (US)
BANKER EDWARD O (US)
KLEMENTICH ERICH F (US)
BANKER EDWARD O (US)
KLEMENTICH ERICH F (US)
International Classes:
E21B17/042; F16L15/06; (IPC1-7): F16L15/06; F16L35/00; E21B17/042
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