Abstract
The article provides an overview of the most common methods of reducing the friction forces of a drill string against the borehole walls used in the drilling of difficult trajectories and horizontal wells. A detailed description of technological, technical (mechanical) and chemical methods of friction forces reducing is given in order to increase the energy supplied to the rock cutting tool when drilling horizontal wells, as well as to reduce hook weight and torque on the rotor or upper power drive of the drilling rig. Overview information in the article is recommended to improve the selection of the drill string and bottom hole assembly during the construction of wells. The proposed extensive classification allows one to scientifically substantiate and select methods for reducing the friction forces of a drill string against a borehole wall.
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