ZJ15钻机底座的振动测试分析

Vibration testing and analysis of ZJ15 rig substructure.

对一现役ZJ15钻机底座在两种钻井速度下的振动情况进行了测试和分析。分析结果表明,底座的振动强度与井深、地质条件和钻井液密度有关;弯曲的方钻杆是造成底座水平方向振动的最主要原因;万向轴因与钻台面存在夹角,从而引起底座在三个方向的振动;采用四挡钻进时,万向轴的工频及其倍频接近底座垂直方向的固有频率是引起底座在该方向振动强烈的原因。建议对ZJ15钻机底座万向轴的安装做一些调整。

Testing and analysis of the vibration of ZJ15 rig substructure at two drilling rates are made. The results show that the vibration intensity of the substructure has a connection with the depth of the well, the geological condition and the density of drilling fluid; the horizontal vibration of the substructure is mainly caused by bent kelly; the included angle between the axis of cardan shaft and the derrick floor is also the cause of the vibration in three directions, and the cause of the intense longitudinal vibration of the substructure while drilling at the fourth rate is that the working frequency and multiple frequency of the cardan shaft are close to the vertical nature frequencies of the substructure. Suggestions on fixing the cardan shaft in the ZJ15 rig substructure is advanced.