Abstract
The process of rock destruction under dynamic impact on it through two technological criteria in the form of specific contact and specific volumetric fracture works is evaluated. Specific contact and specific volumetric fracture work are used to study the physical and mechanical properties of rocks. The efficiency of rock destruction during well drilling with tricone bits functionally depends on the relative specific contact and specific volumetric fracture work. It is stated that the criteria for evaluating the performance of tricone bits in certain forms are functions of the triad: bit-rock-energy. The disclosed physical nature of the kinetic criteria and the obvious functional dependence on the geometric parameters of these drill bits are an objective basis for constructing a methodology for improving the dynamics of new designs and modifications. The parameters of the kinetic passport of the bit are calculated and presented in tabular and graphical forms as functions corresponding to their coordinates of the cones of the roller cutters and the bottom of the well. Experience in solving optimization problems based on a comparative analysis of kinetic (dynamic) criteria has shown that a) when improving almost any design of a cone bit, it is necessary to use the initial geometrical parameters of the buttons and their number b) to ensure that the supports of adjacent cones are equally loaded along the path of leveling the minimum volumetric fracture work of crowns adjacent cones.
Highlights
Today, the modern process of drilling wells around the world has two aspects: technical – the development, design and manufacture of drilling rock cutting tools and technological – the optimal choice of drilling tools in accordance with the physical and mechanical conditions of the bottom hole and determining the optimal drilling conditions: axial loads, rotational velocity of tools and the amount of fluid supplied to the bottom of the well [1]
This is due to the fact that the volume of drilling operations is increasing, the conditions for the destruction of rocks are becoming more complicated, and the rock pressure is increasing at considerable depths
The development of new types of highly efficient rock-cutting drilling tools is an urgent problem of the science and practice of mining, the solution of which helps to increase the economic efficiency of enterprises
Summary
The modern process of drilling wells around the world has two aspects: technical – the development, design and manufacture of drilling rock cutting tools and technological – the optimal choice of drilling tools in accordance with the physical and mechanical conditions of the bottom hole and determining the optimal drilling conditions: axial loads, rotational velocity of tools and the amount of fluid (air) supplied to the bottom of the well [1]. These issues currently remain unresolved, because bottom hole conditions differ by geological region. In order for theoretical studies in the field of rock cutting tools to be relevant and significant in the further development of mathematical modeling, it is necessary to determine the correctness and effectiveness of the criteria for evaluating the work of a drill bit of a particular structure or its modification, it is necessary to state the physical essence of these criteria or express them as functions of geometric parameters of bits and physical and mechanical properties of drilled rocks
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