Research on rock breaking mechanism of drill bit under combined load and field application

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (16) : 51-55.

LI Siqi1 LI Wei1 YAN Tie1 GAO Han2 BI Fu-qing2 MA Hongbin4

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Abstract

Impacting rock under combined load as one of efficient rock breaking technology, can solve the drilling problem of complex hard formation, such as slow drilling rate, serious drilling tool failure. Based on the theories of elastic mechanics and impact mechanics, rock breaking model of indenter is proposed and the effects of factors on the invasion depth are studied. Also, finite element software is used to analyze the response of displacement and stress of rock. At last, the effect of increasing speed under the impacting of combined load is proved further through field application. Results of theoretical research show that: the technology not only can guarantee the invasion depth, but also can reduce the drilling tool failure. It also can expand the response range of rock and the working area of loads and increase the intensity of rock vibration. When the excitation frequency is the same as or is close to the natural frequency of rock, the rock will be resonant and the vibration displacement is the largest. Effects of field application show that: the average of drilling rate of high-frequency low-amplitude axial impact tool is 3m/h, it is increased of 67.65% compared with conventional drilling tool.

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Combined load / impacting / invasion depth / rock breaking efficiency / field application

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LI Siqi1 LI Wei1 YAN Tie1 GAO Han2 BI Fu-qing2 MA Hongbin4. Research on rock breaking mechanism of drill bit under combined load and field application[J]. Journal of Vibration and Shock, 2017, 36(16): 51-55

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