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一、评比钻头的标准我认为，评比钻头的标准只能是该钻头钻进的综合经济效果，可采用每米进尺成本作为评比的标准，即：q＝A（T_1＋T_2）/L＋C/L式中：q—每米进尺成本（元）；A—每台时直接生产费用（元/台时）；T_1—纯钻进时间（台时）；T_2—辅助时间（台时）；C—钻头价格（元）；L—钻头寿命（米）。
First, the criteria for the evaluation of drill bit I think the standard drill bit can only be integrated into the drill economic impact, the cost per meter footage can be used as the evaluation criteria, namely: q = A (T_1T2) / L + C / L : Q- per meter footage cost (yuan); A-each direct production costs (yuan / Taiwan time); T_1-pure drilling time (Taiwan time); T_2- auxiliary time (Yuan); L-bit life (m).