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The most promising method for the conditions of operation of the drill string of the existing ones- is a method for predicting the durability of its elements, such as threaded lock joints (TLJ), which are based on the use of a means of individual assessment of load - indicators of fatigue. Taking into account the limited possibilities of the previously developed methods for estimating the loading capacity of TLJ of the drill string, in the paper the advanced design of the indicator was proposed, by which it is possible not only to quickly obtain data on the residual life of TLJ in the specific operating conditions, but also to record the history of the variable load in the dangerous cross-section of the threaded joint, based on dependence obtained by the results of experimental research. Due to this, dedicated constructive-technological upgrades of TLJ will be carried out or the methods of calculating their strength will be improved.
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