Horizontal drilling for production wells has almost completely displaced the vertical and conventional directional drilling, which led to the significant revision of drill string technical requirements. The need for constant monitoring of the technical condition of various drill stem elements is becoming a mandatory process. Moreover, one of the most widespread accident in drilling is a drill stem failure including pipe washouts and drill string breakdowns. The issue of early prevention of drill stem accidents has always been a critical question since the rotary drilling appearance. For example, an accident analysis on the areas of the Timan-Pechora province indicated that 42% of all accidents from 1971 to 2013 are accidents with drill stem elements. This is a statistics without taking into account sticking (Kamenskikh 2015). However, even since 2013, the speed and footage of drilling has increased significantly. Drill string failures due to fatigue wear of the pipe body and tool joints has become a common problem in drilling companies. In addition to the non-productive time spent on the elimination of such accidents, companies suffer huge losses associated with the disposal of nonserviceable pipes and expensive bottom hole assemblies (BHA) left in the well. The thesis focuses on a problem of drill stem failures during drilling of high-tech wells in the East Messoyakha oil field. Key features, conditions and causes of accidents are discussed. The ways to eliminate the same problems in the further work are considered and estimated from economic and technical point of view.