Author 1:

Name & Surname: Afanasiev A. I.
Company: Ural State Mining University (Ekaterinburg, Russia)
Work Position: Professor
Scientific Degree: Professor, Doctor of Engineering Sciences
Contacts: e-mail: gmf.tm@ursmu.ru

Author 2:

Name & Surname: Simisinov D. I.
Company: Ural State Mining University (Ekaterinburg, Russia)
Work Position: Associate Professor
Scientific Degree: Candidate of Engineering Sciences

Author 3:

Name & Surname: Shestakov V. S.
Company: Ural State Mining University (Ekaterinburg, Russia)
Work Position: Professor
Scientific Degree: Professor, Candidate of Engineering Sciences

The article describes the method of calculation of heat loss when using a roller cone bit. The methodology used the known method of electrothermal analogy. An equivalent calculation scheme of heat flow in the bit bearing, consisting of various bearings, was built. The scheme elements are thermal losses in the bearings and thermal resistance to heat flow. Under consideration is a one-cone bit having four major parallel-arranged heat release elements—three radial and one axial bearing. The results of the calculations for different environments of a one-cone bit are presented—with flushing and washing the face, and with various distribution of axial load on the thrust sleeve bearing. It was found that under certain conditions high heat of the thrust sleeve bearing can lead to failure of support bit. The proposed technique allows quickly assessing the performance reference design of a drilling tool and justifying the choice of a lubricant.

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