Resonance drilling is a new drilling speed raising technology. It is crucial to make impact frequency match rock’s resonant frequencies under different conditions to achieve the best rock-breaking efficiency in drilling process. Therefore, it is necessary to study resonant response of bottom hole rock under confining pressure and constraint conditions. Here, considering bottom hole rock internal pore structure and rock subjected to bottom hole confining pressure, through theoretical analysis and numerical simulation, relations between rock displacement response amplitude and impact frequency were obtained under different constraints and different pore distributions, and then rock’s resonant frequencies were acquired. It was shown that under simulation conditions here, rock’s resonant frequencies don’t change with variation of confining pressure, but they are slightly higher than those under the free condition; when bottom hole rock is constrained along radial displacement, its resonant frequencies become higher, and they increase with increase in rock’s Poisson’s ratio; when pore in rock distributes uniformly along impact direction, rock’s resonant frequencies are not related to porosity; when pore in rock distributes unevenly along impact direction, rock’s resonant frequencies are related to uneven degree of pore distribution, the higher the uneven degree, the lower the rock’s resonant frequencies. The study results provided a preliminary theoretical basis for analyzing rock’s resonance response characteristics under the condition of bottom hole, and provided a basis for choosing parameters of the resonance drilling technology.
Key words
Resonance drilling /
frequency /
pore /
confining pressure /
impact force /
displacement responding amplitude
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