Patent ID: 9057464
Filing Date: 2015-06-16
Classification: E21B,F16L

Abstract:
1. A threaded pipe connector, comprising: a) a pipe body comprising an external thread on one end; and b) a coupling comprising an internal thread on a corresponding end; wherein both the external thread and the internal thread are buttress threads capable of matching with each other; a ratio of thread height to pitch is between 0.25 and 0.35, bearing surface angle is between −15 and 3°, and guide surface angle is between 10 and 50°; a clearance is provided between a thread crest and a thread root after engagement of the external and internal threads; a sealing area between the pipe body and the coupling comprises in sequence a first cylindrical transitional area, a cylindrical sealing area, a secondary cylindrical transitional area, a conical sealing area, and a conical transitional area; tapers of both sides of the conical sealing area are the same; and one end of the conical transitional area is connected with a torque shoulder.