Influence by Thread Interference on Premium Connection Performance

Analyzed is the influence by different interferences of the Φ139.70 mm×9.17 mm P110 premium thread on the connection performance by means of the ABAQUS software，and under conditions of make-up，and make-up plus tensile loading. Result from the simulation reveals that if，after make-up，the thread interference is more than 0.159 0 mm，the contact pressure on the sealing surface changes a little；if the thread interference is more than 0.238 5 mm，along with increase of the interference，the contact pressure of the sealing surface is going down remarkably；under the condition of make-up plus tensile loading，along with increase of the interference，the contact pressure of the sealing surface is decreased，while the contact position is shifted towards the shoulder；and when the interference is more than 0.079 5 mm，tensile failure fracture takes places at the thread section，while when the interference is more than 0.159 0 mm，the similar fracture takes places with pipe body.