High torque threaded connections with external upset and multiple seals

A thread profile for a tubular member, comprising:

• a first section including first threads that extends from a first end of the thread profile at a first taper angle relative to a longitudinal axis of the tubular member, wherein the first end includes an end surface;
• a second section including second threads that extends from the first section at a second taper angle relative to the longitudinal axis, wherein the first taper angle is greater than the second taper angle;
• an intermediate shoulder provided at a transition between the first and second sections, wherein a cross-sectional area of the tubular member increases at the intermediate shoulder;
• an external upset extending proximally from the second section, wherein the external upset increases a cross-sectional area of the thread profile as compared to remaining portions of the tubular member;
• and
• a bulbous projection located between the end surface and the first threads,
• wherein a maximum outer diameter of the external upset is less than a maximum outer diameter of the second section and greater than an outer maximum diameter of the first section.

A tubular connection, comprising:

• a first tubular member including an internal surface defining an internal thread profile at a box end of the first tubular member and a bore of the first tubular member, wherein the internal surface includes a first angled end surface at the transition between the internal thread profile and the bore of the first tubular member;
• and
• a second tubular member including an exterior surface defining an external thread profile on a pin end of the second tubular that is threadably engageable with the internal thread profile, an internal surface opposite of the exterior surface of the second tubular member defining a bore of the second tubular member, and a second angled end surface at a distal end of pin engageable with the first angled end surface, wherein the external thread profile includes:
• a first threaded section that extends at a first taper angle relative to a longitudinal axis of the threaded connection;
• a second threaded section extending from the first threaded section at a second taper angle relative to the longitudinal axis;
• an intermediate shoulder provided at a transition between the first and second threaded sections and engageable with a corresponding intermediate shoulder provided on the internal thread profile;
• and
• a lip extending between the second threaded section and the second angled end surface, the lip including a bulbous projection configured to seal against the internal thread profile, wherein a first portion of the bore of the second tubular member that is opposite the bulbous projection has the same inner diameter as a second portion of the bore of the second tubular member that is opposite the first and second threaded sections, and wherein the internal surface of the first tubular member is flush with the internal surface of the second tubular member when the external thread profile is threadably engaged with the internal thread profile;
• and
• an external upset on the second tubular member, wherein the external thread profile is disposed between the external upset and the second angled end surface at the distal end of the pin, wherein a maximum outer diameter of the external upset is less than a maximum outer diameter of the first threaded section, and wherein the maximum outer diameter of the external upset is greater than a maximum outer diameter of the second threaded section.