FIELD: mining.
SUBSTANCE: method for creating vibrations of the drill string, wherein vibrations are created in at least a part of the drill string, in accordance with the first characteristic of acceleration change with use of the top drive, connected, at least indirectly with the drill string. The first characteristic of acceleration contains the previously stored oscillation parameters, including the first acceleration characteristic, with the first signal form determined by a particular first waveform selected from the group consisting of sinusoidal, speed and triangular shapes. This creates vibrations in at least a portion of the drill string in accordance with the second acceleration characteristic different from the first characteristic of acceleration change by means of the top drive. The second characteristic of acceleration contains the previously stored oscillation parameters, including the second acceleration characteristic, with the first signal form determined by the second waveform selected from the group consisting of sinusoidal, speed and triangular shapes, and the transition between any of sinusoidal, speed and triangular waveforms associated with the first form of the signal. The second waveform defining the second signal form is different from the first waveform defining the first signal form and the creation of vibrations of the at least a portion of the drill string in accordance with the third characteristic of acceleration change by means of the top drive. The third characteristic of acceleration change is optimized on the basis of the response associated with fluctuations according to the first characteristic of acceleration change and response associated with fluctuations in accordance with the second characteristic of acceleration change.
EFFECT: increased efficiency of drilling.
20 cl, 8 dwg
