Patent ID: 6447025
Filing Date: 2002-09-10
Classification: E21B,F16L

Abstract:
An oilfield tubular connection for threadably interconnecting a tapered pin thread with a tapered box thread, the connection comprising:the pin member having a central throughbore and the tapered pin thread, the pin thread having a pin root and a pin crest, the pin thread also having a pin pressure flank and a pin stab flank each spaced between the pin root and the pin crest, each of the pin thread and the box thread have a thread flank angle from about 60 degrees to about 90 degrees, the pin crest having a stab flank pin crest radius and a pressure flank pin crest radius, the stab flank pin crest radius being from three to five times the pressure flank pin crest radius; and a box member having a central box throughbore and a tapered box thread, the box thread having a box root and a box crest, the box thread further having a box pressure flank and a box stab flank each spaced between the box root and the box crest, the box crest having a stab flank box crest radius and a pressure flank box crest radius, the stab flank box crest radius being from three to five times the pressure flank box crest radius, thereby minimizing damage to the connection during misalignment of the pin member and the box member.