Link for citation: Isaev E.D., Kovalev A.V., Saruev L.A. Developing recommendations for optimizing the design of the drilling bit for pellet impact drilling. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2022, vol. 333, no. 5, рр. 32-42. In Rus.

Relevance. Despite the active development of renewable energy sources, fossil fuels still occupy a leading position among the known energy resources. According to forecasts, in the coming decades Russia will remain one of the largest world exporters of fossil fuels. In Russia, the issue of maintaining the volume of extraction of minerals is becoming more and more acute. This requires the exploration of new deposits, as well as the development of new solutions that allow carrying out the work in difficult conditions. Pellet impact drilling can be one of such solutions. Some researchers have worked on the development of this drilling method. A large number of different pellet impact drilling bits have been proposed. At the same time, there is still no design accepted as the most rational one. Purpose: development of recommendations for the design of a drilling bit for pellet impact drilling, which most fully meets the requirements of geological exploration and mining industries. The object of the research is a drilling bit for pellet impact drilling. Methods: review of literary sources; systematization of the classification features of various designs of drilling bits for pellet impact drilling; analysis of previously developed designs according to the classification developed in this work. Results. It was found that the highest mechanical speed of pellet impact drilling is achieved when using a drilling bit consisting of one mixing chamber, cylindrical in shape, with a diffuser on the lower edge. In this case, the rise of the pellets above the inlet ports must be limited by a retarding device, and the distance between the drilling bit and the well bottom must be maintained without using the elements contacting with the well bottom. The paper proposes a design of the drilling bit which meets the mentioned criteria.