Threaded joint for oil well pipes

Details Threaded joint for oil well pipes Threaded joint for oil well pipes

E - Fixed Constructions

21

B

E21B 17/08 (2006.01) F16L 15/06 (2006.01) E21B 17/042 (2006.01)

Patent

CA 2163282

A threaded joint for an oil well pipe having (1) a tapered threaded having roughly the shape of a buttress thread, (2) a pin having a male thread and a box having a female thread, (3) a seal and a torque shoulder, characterized in that (i) the load flank angle of the threads is -20 or greater and less than 0, the stab flank angle is greater than 30 and at most 60 (ii) there is a positive amount of interference between the male threads and the female threads, and (iii) during and at the completion of make-up, the load flanks and the stab flanks are contacting each other, and there is a gap between the crests and the roots.

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