Research on the Stress Characteristics of Wellhead Bolts

Abstract

Bolts are important connectors in the wellhead oil pipe spool, and the safety of wellhead bolts is an important guarantee for the operation of the oil pipe spool. Taking the wellhead oil pipe spool as the research object, a three-dimensional fluid model and a structural model of the wellhead equipment and its bolts were established. Through finite element numerical simulation, combined with the basic theory of fluid solid coupling, the equivalent stress and dangerous bolt distribution of the oil pipe spool bolts were studied. The study showed that under two different working conditions, the average equivalent stress on the bolt as a whole increased as the bolt position approached the outlet of the side flow channel, The most dangerous bolt in the wellhead tubing spool appears near the outlet; The stress distribution of bolts in different sections is uneven, and the stress at the bolt head, thread, and smooth rod intersects is greater than that at the middle section of the bolt. The bolt also bears both axial and bending stresses.