The drilling riser's axial load effect on its mechanics in deep water is obvious, so, in practice, the top tensile load of drilling riser must be kept highly enough to a…
海洋深水钻井隔水管的轴向载荷对其力学特性有显著的影响，因此，在实际钻井作业过程中，隔水管顶部应保持足够的张力，避免隔水管处于受压状态。
The 1~(st) domestic hydraulic umbrella drill is therefore introduced to accelerate drilling velocity with obvious effect as a new breakthrough for drilling and blasting.
为了更好地加快施工进度，在打眼爆破方面要有新的突破，引进国内首台液压伞钻，大大提高了的打眼速度，效果显著。
And the larger the mass of the additional system, the greater the amplitude formed after exciting, the more obvious the amortization effect on drilling string.
附加系统质量越大，受到激励后的振幅越大，对钻柱的减振作用越显著。
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