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因此，钻进效率低，回次进尺短，孔斜不易控制。Also it is difficult to control hole deviation.

遂道开挖进尺的大小与掏槽方式紧密相关。The footage tunnel excavation is closely related to the mode of cutting.

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通过仿真计算可以预测钻头的动钻压及进尺。By simulating the bit's longitudinal vibration, the dynamic load and footage are sought out.

本文提出了一种按最低成本原则确定单只钻头进尺的实用方法。A method is proposed to determine the bit footage when the drilling cost per meter reaches a minimum.

万年矿岩巷单进进尺低，严重影响着万年矿生产地区的正常衔接。The problem of slow driving in rock roadway seriously affects normal replacing driving and working in Wannian mine.

在实际施工时可以适当提高单次爆破进尺，从而加快新建朋山岭隧道施工进度。The advance per attack can be appropriately increased, and the new tunnel construction progress will be accelerated.

通过取心工具和钻头的优选、参数优化以及技术措施的强化，该井取心进尺18。Through optimization of coring tools and bits and improving technical measures, the coring footage of the well is 18.

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钻进时不能断水，如果听不到正常的震动声音或进尺过慢，应及时提钻检查。Drilling could not be without water, if not hear the normal vibration sound or drill too slow, lift the drill to check without delay.

看起来他在睡觉，但脑子里想的还是进尺和机器运转的情况。It looked as if he was sleeping, but he was still thinking about the footage and the situations of the machines running in his brain.

针对开挖进尺难以确定的问题，基于太沙基松散介质理论，推导了均质土中开挖进尺的计算公式，并推广到成层土中。Based on Terzaghi's loose medium theory, a calculating formula of digging length in homogeneous soil is proposed and applied to layered soil.

施工方法为三导洞加横通道法，并破除了常规进尺限制。Method of 3-heading excavation with across channel was introduced in construction and the general restriction of digging footage was can celled.

埋深比、进尺与掌子面稳定性成负相关关系，但对砂土掌子面破坏规律还需进一步研究。Burial depth ratio and footage have a negative correlation with heading stability. However, failure law of sand tunnel heading needs further study.

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介绍了利用剪切强度和单位进尺钻井成本的关系来进行PDC钻头选型的新方法。This paper presents a method to select PDC bits. This method uses a correlation between shear strength and drilling cost estimation per unit length.

根据现场实际数据，应用最小二乘法拟合出了水平井水平段成本和进尺之间的关系方程。The relationship between the cost and the footage at the horizontal interval length is matched by least square method from collecting the field data.

针对坚硬地层金刚石钻进参数的选择问题，从钻压、转速与泵量三方面作了分析，提出了合理选择钻进参数的方法，以保证正常生产施工的需要，提高钻探进尺效。According to the parameter selection problems of diamond drilling in hard rocks analysis is made from weight on bit, rotation speed and pumping quantity.

现场试验同样证实设计的自振空化射流喷嘴在保护钻头、减少钻头磨损及增加进尺、提高机械钻速方面有显著作用。Field tests also show that the self-resonating cavitation nozzle is highly effective in reducing bit wear, increasing drilling footage and drilling speed.

新站地区地质情况比较复杂，在钻井施工过程中极易发生井塌等情况，严重者由于井塌而导致了新钻井被迫报废进尺。Geological circumstance in Xinzhan area is complicated and borehole collapses occur easily during drilling operations that result in borehole obsolescence.

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针对钻头包泥堵钻和钙质胶结层难以进尺等影响钻进效率的几个问题，对刮刀钻头结构进行了改进设计，并取得了令人满意的效果。Aimed at resolve the several problems which affect drilling efficiency, such as balling up and calcareous cementation, the design of blade bits was modified.

该方法以一个建成的PDC钻头使用资料库为基础，该数据库包括钻头型号、所钻井段地层的平均剪切强度、单位进尺钻井成本等指标。It is based on a database of past PDC bits. In the databased, it includes bit type, average shear stress of well which bit was used in, cost per unit length.

现场试验表明，优化后的设计可降低炸药消耗量，提高掘进爆破进尺。The on-site experiments have shown that the explosive specific charge of blasting in excavating roadway is decreased but the advance per attack is increased.