水平井侧钻过程中钻柱横向振动规律的研究

在水平井的侧钻过程中,钻柱很容易发生横向振动,引发钻柱失效、井眼扩径等严重事故。鉴于此,全面地分析了侧钻水平井钻柱的横向振动,以近井底长钻柱单元为研究对象建立了这种振动的力学模型,研究了横向振动的动力学规律,获知了钻柱横向振动的共振频率的分布规律。振动规律的实际应用反映了钻柱横向振动规律理论分析的正确性。侧钻水平井钻柱横向振动规律的研究对水平井在侧钻过程中保持井壁稳定、减少钻柱失效、提高钻速和降低钻井成本具有重要的理论价值和实际意义。

Lateral drill string vibration in horizontal holes

In the course of sidetracking of horizontal holes, lateral drill string vibration often occurs. Therefore an overall analysis of lateral drilling string vibration in sidetracked holes is made. A mechanical model for the vibration is established by taking the long drilling string near the bottom hole as subject investigated. The dynamic law of the lateral vibration is studied, and the distribution law of the resonance frequency of the lateral vibration is obtained. The correctness of the vibration law analysis is proved by application practice. The study is of great importance to keeping stable borehole wall and reducing failure of drill string.