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在孔内工作的钻杆柱是一个下端支承在孔底,而上端固定在钻机立轴上的弹性系统。钻杆柱回转时承受三种形式的振动:扭转振动、横向振动和纵向振动。当外力作用的频率与钻杆柱固有振动频率一致时则产生共振现象。引起钻杆柱振动的主要因素是:由钻杆柱壁厚不均匀和接手同心度较差而产生的离心力;钻杆柱承受的扭矩和压力的变化;钻杆柱与孔壁的摩擦力;冲洗液的激动等。
The drill pipe string working in the hole is an elastic system with the lower end supported on the bottom of the hole and the upper end fixed on the vertical shaft of the drilling machine. Drill pipe column to withstand three types of vibration when turning: torsional vibration, lateral vibration and longitudinal vibration. Resonance occurs when the frequency of external forces is the same as the natural frequency of the drill string. The main factors that cause the vibration of the drill string are: the centrifugal force caused by the uneven thickness of the drill string and poor conception of the hand grip; the variation of the torque and pressure borne by the drill string; the friction between the drill string and the hole wall; Flushing fluid and so on.