DefinePK

Abstract

The overview of scientific research works in which techniques and results of analytical and experimental studying of power and kinematic characteristics of operation of roller drill bits is stated in this paper. The interest to this subject is explained by its great practical importance. Economic indicators of a well construction depend on the overall performance of the drilling tool. At the same time, results of researches often have contradictory character that can be explained by the high complexity of processes happening during the bit operation on a borehole bottom. The analyzed works are grouped according to the fields of researches. The overview of main works devoted to studying of kinematics of roller drill bits, to interaction of elements of drilling bit cutting structure with the destroyed rock, to the calculation of efforts and analysis of tension of drilling bit bearing and cutting structure elements by means of various experimental methods and methods of mathematical modeling is provided. The provided analysis of known results of researches in this field is not comprehensive, but can be useful in case of further studying of this issue. The results of the investigational study of a load distribution between drilling bit bearings applying the model of the drilling bit bearing assembly made of photoelastic material are also considered in this paper. It is established that the nature of a load distribution between bearings depends on the radius of the effort application to a roller. In case of a little change of radius in a certain area, there is a considerable redistribution of loading between drilling bit bearings. The placement recommendations for the optimization of a drilling bit cutting structure on a roller surface are offered according to research results.