Pick up drill stem test tool.

提起钻柱测试工具.

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The drill fluid in the drill stem increases the inertia of lateral vibration.

钻柱内的钻井液增加了钻柱横向振动的惯性质量.

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The longer the single drill pipe , the lesser the critical compressive force of drill stem.

钻杆的单根长度越长, 钻柱所能承受的临界载荷越小.

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Calculating results show that fluctuation pressure decrease with eccentricity between drill stem and well bore increase.

计算结果表明:随钻柱与井眼间偏心度增大,波动压力减小.全偏心情况下的波动压力大约只有同心情况下的一半.

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