Patent ID: 6174001
Filing Date: 2001-01-16
Classification: E21B,F16L,Y10T

Abstract:
A threaded pipe connection comprising:a box member having a two-step wedge thread configuration comprising two wedge thread steps each with a tapered, internal, generally dovetail-shaped wedge thread having stab flanks, load flanks, roots, and crests, the internal thread increasing in width in one direction:a pin member having a two-step wedge thread configuration comprising two thread steps each with a tapered, external, generally dovetail-shaped wedge thread having stab flanks, load flanks, roots, and crests, the external thread increasing in width in the other direction so that complementary flanks of the box member thread move into engagement during rotational make-up of the connection;the roots and crests of at least one wedge thread step on the box member are dimensioned to contact complementary roots and crests on the pin member upon final make-up;on the wedge thread step on the box member having roots and crests dimensioned to contact complementary roots and crests on the pin member, the stab and load flanks on the box member are dimensioned to contact complementary stab and load flanks on the pin member upon final make-up; andat least one of the stab and load flanks of the other wedge thread step on the box member are dimensioned to remain in clearance from the corresponding stab and load flanks of the other wedge thread step on the pin member upon final make-up.wherein clearance exists between the load flanks of the other of the wedge thread steps upon final makeup.