THEORETICAL STUDIES OF DRILLING FROZEN SOILS WITH A SCREW DRILL

Abstract

Link for citation: Martyuchenko I.G., Zenin M.I., Kolesnikov A.Yu., Boikov E.V. Theoretical studies of drilling frozen soils with a screw drill. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 9, рр. 194-202. In Rus. The relevance of the study is caused by the need to create a new drilling tool to drill frozen soil in difficult conditions. This line of research is important and relevant for ensuring the formation of wells on frozen sands, since the screw drilling tool performs the deformation of frozen soil separation, which makes it possible to drill hard-to-drill soils, namely frozen sands. The main aim: to study the interaction of the destructive part of the helical drill with frozen soil and determine the rational values of the geometric parameters of the helical blade when achieving the lowest value of the force of soil separation and the highest value of the productivity of drilling. Objects: interaction of the destructive part of the helical blade of a helical drill with frozen soil. Methods: plotting dependencies of factors showing the energy intensity of drilling, on the angle of rotation of the radius of the helical blade, at which it increments, and on the pitch of the helical blade in the second section of the destructive part of the helical drill; analysis of the obtained results of theoretical studies of the force of soil separation and the efficiency of drilling from the geometric parameters of the helical blade of a drilling tool on frozen soils. Results. The authors have studied the influence of the geometrical parameters of the helical drill on well formation, obtained the dependences of the efforts and constructed the graphs for soil separation, as well as the dependence of the productivity of drilling on the angle of rotation of the radius of the helical blade, at which it increments, and on the pitch of the helical blade in the second section of the destructive part of the helical drill. Based on the results of theoretical studies, an analysis of the obtained dependencies was carried out and the area of rational values of the geometric parameters of the helical blade of a helical drill on frozen soils was found.