Hose bit can be divided into cutter teeth and cone teeth, cone teeth for weathering of soft rock strata, and permafrost, cutter teeth used for drilling hard bedrock.
筒式钻头的切削具可分为截齿和牙轮，截齿筒状钻头用于风化软岩及永冻土地层钻进，牙轮筒式钻头用于硬质基岩钻进。
The effect and accuracy of using the apparent resistivity logging curve to identify permafrost and its influencing factors, such as soil properties, ice content and drilling diameter are discussed.
初步探讨了利用视电阻率电位测井曲线，划分多年冻结层的效果及精度与冻结层岩性、含冰量和井径等因素的关系。
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