Yavors'kyj M. The improvement of the technology of releasing sticking of drilling string by percussion tools

The dissertation is devoted to efficiency improvement of a kinetic effect on the sticking of drilling string by means of percussion tools. A mathematical model of the technology of releasing sticking by means of percussion tools is designed and it takes into account how main technical parameters influence the efficiency of the kinetic action in the sticking area. Kinetic characteristics of the fluctuation system and influence of the main factors of the kinetic action criteria on the sticking area (i.e. an impulse of the fluctuation system and the inner force at the upper border of the sticking area) are investigated. Optimal technical parameters that provide an extreme value of the criteria of kinetic efficiency are fixed. Technologies and technical means for releasing sticking of drilling string by percussion tools within impaction and impulse-wave regimes are improved. The dominant results of the dissertation have been inserted into well drilling practice.