The paper presents factors that reflect drilling effectiveness such as non-productive time of well construction and time spent on mechanical drilling and scheduled round trips. Non-productive well construction time for directional drilling at a field usually accounts for 3.2 % of the total construction time. The time spent on mechanical drilling and scheduled round trips using rotary steerable systems, depending on the interval subjected for drilling, is reduced. That increases the average mechanical drilling speed by 8–40 %, which allows drilling wells ahead of the planned schedule by 7 days or more. The shortcomings of the existing Russian and foreign analogues of rotary steerable systems are identified. They are caused by incomplete design, low accuracy and imperfect technologies. The design of the bit shaft drive was improved in the developed drilling tool control system through the use of three electric drives with feedback sensors controlled by the electronic module. In order to improve bit positioning accuracy in rotary steerable systems, the design of a drilling tool control system is proposed. The design includes a module for determining spatial position based on a geostationary system and fiber-optic gyroscopes with a closed loop. The drilling tool control system has a modular type, which allows it to be included in various drill string assembly. The prototype of the module for determining the spatial position of the drilling tool control system is studied. During the studies the module was deviated at different angles; the software simulated well deepening, zenith and azimuth angles were measured. The results of studies showed that the absolute measurement errors of azimuth and zenith angles do not exceed 0.5 %.
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