Modern Mining ›› 2024, Vol. 40 ›› Issue (06): 236-.
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With the increasing depth of boreholes in in-situ leaching sandstone-type uranium depos⁃
its，the strata encountered by drilling are becoming more and more complex，and the probability of acci⁃
dents in boreholes such as drilling，burning and sticking is increasing. It is often difficult to deal with acci⁃
dents by conventional methods.In view of the above problems，a safe and efficient drilling accident treatment
technology is proposed. Based on the annular space between the drilling tool and the borehole，the accident
handling drilling tool with the diameter between the accident drilling tool and the borehole diameter can fully
clean up the mud and sand，cuttings，sintered body and other accident layers to ensure the smooth drilling
annulus.At the same time，a set of milling tools suitable for in-situ leaching sandstone uranium drilling was
designed.Through practical application，the method can effectively improve the efficiency and success rate
of accident handling，reduce the safety risk of accident handling，and has the conditions for popularization
and application.
