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1. (WO1998050721) ULTRA HIGH TORQUE DOUBLE SHOULDER TOOL JOINT

Pub. No.:    WO/1998/050721    International Application No.:    PCT/US1998/008476
Publication Date: Fri Nov 13 00:59:59 CET 1998 International Filing Date: Wed Apr 29 01:59:59 CEST 1998
IPC: E21B 17/042
F16L 15/06
Applicants: GRANT PRIDECO, INC.
Inventors: SMITH, Jackie, E.
WINSHIP, Thomas, E.
WILSON, Gerald, E.
Title: ULTRA HIGH TORQUE DOUBLE SHOULDER TOOL JOINT
Abstract:
An ultra high torque double shoulder tool joint for maximizing the torsional strength of a threaded connection by correlating a transverse cross-sectional counter-bore area of the box (12) and pin (10). The pin (10) includes a base section (74) and a nose section (24). The nose section (24) defines a cross-sectional nose area (28). The pin external threads (22) include a taper no greater than 1/12. The box (12) include a cross-sectional counterbore area (46) and a cross-sectional box area (52). The overall strength of the tool joint is dependent upon the torsional strength of the threaded connection, the cross-sectional nose area (28) and the cross-sectional counter-bore area (46).