hole drag
... hole direction 井眼方位角 hole drag 井眼阻力 hole drift angle 井斜角 ...
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本文建立了在水平分支井眼中的钻柱摩擦阻力微分方程，并得到了在起、下钻过程中钻柱的总摩阻。
In this paper, the differential equation for the frictional resistance on the drill string in branch horizontal Wells was established and the total drill string friction during tripping was got.
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