Myhajlyuk V. Efficiency of exploatation increasing of sucker rod thread connections

Thesis is dedicated to increasing the operational efficiency of sucker rods thread connections. The paper analyzes the working conditions of the sucker rod threaded connections, the influence of operational factors on the frequency of elements breaks of the rod string, the existing methods for calculating the loads and stresses on the calculation of the threads, the ways to reduce the uneven load on the connection of the threads of sucker rods.The author has been improved method of estimating the distribution of loads on coils of sucker rods threaded connection. The stress - strain state of new and worn threads of sucker rods with different values of the overlap of turns using the finite element method, the stress - strain state of the threaded connection of sucker rods under the joint action on his efforts axial tension, make-up torque, bending moment and the technique of study of fatigue failure of threaded connections and activities designed to improve the operational efficiency of sucker rods threaded connections have been studied. The results of analytical and laboratory research have been tested in oil and gas company JSC "Ukrnafta".