the drill pipe string

基本解釋

What is the drill pipe string weight in air?
鉆桿在空氣中的重量是多少？
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The riser’s inner hollow core (a pipe within a pipe) is reserved for the drill string.
立管內(nèi)部核心是空心的（管中管），留給鉆柱使用。
The contact and friction of a drill pipe string with borehole wall and its deformation are analyzed and calculated with modified Newton iteration and approximate gradient increment of loading.
用修正的牛頓迭代法進(jìn)行迭代運(yùn)算和用近似梯度增量法修改載荷增量，并對(duì)鉆柱與井壁的接觸摩擦和鉆柱變形進(jìn)行了分析計(jì)算。

The new pipe will be placed right next to the small section of abandoned pipe where the drill string got stuck.
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