Статті КПтаІМ (ДМетІ)

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    Improving the Performance Properties of Drill Rods for Drilling and Blasting Operations
    (M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine, Dnipro, 2025) Minieiev, Serhii; Pazynich, Artem; Hankevich, Valentin; Kiba, Viacheslav; Livak, Oksana; Akulinin, Danil; Pronina, Hanna M.
    ENG: The article examines the operating conditions of drilling equipment, particularly drill pipes. The purpose of this study is to develop drill pipes based on the load they experience and the material they are made of. Factors influencing the wear of drill pipes are identified, including friction at pipe joints, thermal wear, abrasive wear, oxidative wear, and others. The working conditions and loads on drill pipes under various drilling scenarios are analyzed, including the maximum loads encountered during the drilling of hard rock using roller bits. The functions of drill pipes are considered, such as transmitting axial force and torque, transporting drilling fluid to the drilling site, removing rock debris from the wellbore. The study justifies and selects materials for drill pipes that balance strength and cost while meeting the requirements of drilling equipment. To achieve this goal, the stress-strain state of drill rods during rotary drilling under operational loads was studied, considering the displacement of working loads or the misalignment of the drill rod and bit axes. Mathematical calculations and data processing are performed using the engineering software package MATHCAD for drill pipes with an outer diameter of DD and an inner diameter of dd, depending on the physical and mechanical properties of the pipe material, axial load on the drill string, and the torque transmitted by the drill pipes. The article provides calculations for drill pipes used in roller drilling of 200 mm diameter wells in hard rock. Connections between drill pipes are analyzed, particularly a specialized locking threaded connection with an increased thread profile height. The study reviews designs used in international practice and domestic drilling equipment manufacturing. A design and calculation of the threaded connection for drill pipes made of 40X steel are presented, along with drawings of the calculated thread profile. The operating conditions of drilling equipment and factors affecting the wear of drill pipes are examined, and recommendations for extending their service life are provided, which can be utilized in the design of new drilling equipment. Suggestions and structural solutions to enhance the performance characteristics of drill pipes are proposed, allowing the selection of optimal material parameters and structural elements of drill pipes based on the operating conditions of the drill string.