За результатами промислових досліджень на бурових ВАТ «Укрнафта» та ДК «Укргазвидобування» встановлено, що із збільшенням проходки, яка характеризує ступінь зношеності шарошкового долота, спостерігається зростання потужності (дисперсії) процесу зміни віброшвидкості та віброприскорення вертлюга для всіх компонувань низу бурильної колони. Між стандартами віброшвидкості σ V та віброприскорення σ W і проходкою на долото H дол встановлені емпіричні кореляційні залежності σ V = f(H дол) і σ W = f(H дол), ймовірність існування яких знаходиться в межах 0,9-0,95. За цими залежностями можна встановити кореляційні зв'язки між об'є

Two plans were used: classical and factorial (rational) during experimental research. Classical plan is used when the number of external independent factors is not more than two. Increasing number of external factors leads to using of rational experiment planning which allows to significantly reduce the number of combinations of these factors. For example, with four external factors that change at four levels according to the classical plan number of combinations 44=256. Rational planning of the experiment reduces number of these combinations to 16. To process results of the factorial experiment using two methods proposed by M. M. Protodiakonov and R. S. Yaremiychuk. The article presents a step-by-step method of processing the results of a factorial experiment with an example of simultaneous use of these methods. Comparing the results of processing, the authors believe that the best results are obtained using the Protodiakonov’s method. The authors tested two types of multifactorial empirical model of multiple correlation, one of which is given by the product of partial empirical dependences, the second – by the sum. Using these models there were found that the results of factor experiment processing should be represented by a multifactor empirical model, which is presented by the product of partial empirical dependences.

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The purpose of the proposed article is to establish the causes of oscillations of drilling tool and the basic laws of the distribution of the total energy of the process of changing the axial dynamic force over frequencies of spectrum. Variable factors during experiments on the classical plan were the rigidity of drilling tool and the hardness of the rock. According to the results of research, the main power of the process of change of axial dynamic force during drilling of three roller cone bits is in the frequency range 0-32 Hz in which three harmonic frequency components are allocated which correspond to the theoretical values of low-frequency and gear oscillations of the chisel and proper oscillations of the bit. The experimental values of frequencies of harmonic components of energy and normalized spectrum as well as the magnitude of the dispersion of the axial dynamic force and its normalized values at these frequencies are presented. It has been found that with decreasing rigidity of the drilling tool maximum energy of axial dynamic force moves from the low-frequency oscillation region to the tooth oscillation area, intensifying the process of rock destruction and, at the same time, protecting the tool from the harmful effects of the vibrations of the bit. Reducing the rigidity of the drilling tool protects the bit from the harmful effects of the vibrations generated by the stand. The energy reductions in these fluctuations range from 47 to 77%.