1·Keep the drill centred in the borehole while it ascends and descends.
当钻头上下钻时，要把钻孔保持在中心。
—— 《柯林斯英汉双解大词典》
2·It optimises the chances of recovering an undisturbed, continuous sedimentary sequence from the lake floor and minimises the potential for trapped gases to gain entry to the borehole.
它优化了从湖底稳定取样、并保证从湖底沉积层取样的连续性，并最小程度上减小了冒气对钻孔的破坏。
3·A borehole image of rock layers indicating an underground point bar.
指示某地下曲流沙坝的一幅岩层钻孔图像。
4·The functions of the driving mechanism directly affect drilling efficiency, borehole quality and other technological performances of the drilling machine.
钻机给进机构性能的好坏直接影响钻探效率、钻孔质量的高低和钻机其他技术性能的发挥。
5·Point bars modeled in a North Texas gas field on the basis of borehole and seismic images.
根据钻孔和地震图像建立的德克萨斯州北部某气田中的曲流沙坝模型。
1·The borehole influences this difference if the tool is tilted or if there is a cave opposite one of the receivers.
当仪器倾斜或其中一个接收器正对着一个洞穴时，井眼将影响这种差异。
2·In borehole sonic logging, these may be the shear, flexural and Stoneley waves.
在井眼声波测井中，这些波是横波、弯曲波、斯通·利波。
3·The problem of borehole instability in the Triassic system and the Carboniferous system has been kept as a major difficulty in the exploration and development of this oilfield.
塔河油田三叠系、石炭系井眼失稳问题一直是该油田勘探与开发的技术难点。
4·With rational unit length and hinge rotating Angle, the flexible casing can be adaptable to the buckling borehole.
在合适的单元长度和铰链转角下，柔性套管可以较好地适应弯曲的井眼。
5·During drilling horizontal well, usually adopt geometry steerable drilling technology to increase the penetration rate of borehole track in oil reservoir.
在水平井钻井中，通常采用地质导向钻井技术来提高井眼轨迹在油层中的穿透率。
1·The variation of seismic velocity in shallow levels has important influence on velocity modelling and reflection imaging, which is confirmed by borehole data.
这一变化对建立地下速度模型及反射构造成象有较大影响，钻井资料证实了这一结果。
2·The Santee Coastal Reserve core, a 545 ft deep borehole in northeastern Charleston County, South Carolina, recovered sediments of Late Cretaceous, Paleocene, Eocene, and Quaternary age.
Santee海岸储藏岩心是从加州南部的查尔斯顿的545英尺深的钻井中采集的，代表白垩纪晚期、古新世、始新世和第四纪的沉积物。