At the time of well drilling, wellbores arbitrarily deviate from a given direction. Directional well drilling imposes specific technological difficulties. That’s why the development of measures to prevent the dog leg is a significant factor in the effective increase of the drilling works. The degree and intensity of well deviation are influenced by several complex factors characterized by hard-to-establish impact nature. To prevent the dog leg, it is necessary to implement various technical and technological measures. Their development requires studying the causes of well deviation. It is currently believed that the arbitrary well deviation is influenced by geological, technical, and technological factors. Modern standards of deep well construction and inclined and horizontal drilling require improving drilling tool designs and technologies. The drill string is operated in aggressive and abrasive environments under the influence of intensive dynamic and long cyclic loadings. Therefore, the problems of using vibration protection arrangements of pipe columns, predicting the properties of rocks, and advanced modeling of the contact interaction of the drilling tool with the well wall, improving the performance of the drilling tool through the local application of specialized functionally gradient coatings and ensuring the reliability and tightness of threaded connections are still relevant nowadays. It should be mentioned that models’ development of contact interaction between pipe columns and layered or heterogeneous rock environment will allow solving typical drilling problems more precisely: providing the required torque on the bit; determination of the actual axial load on the bottom hole; assessment of drilling process energy balance and drill string resource, forecasting wellbore trajectory
Received 21.12.2021
Revised 04.03.2022
Accepted 23.05.2022
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