深井钻柱振动纵向动态响应规律研究

发布时间：2018-06-02 00:25

本文选题：深井 + 钻柱振动　；参考：《东北石油大学》2015年硕士论文

【摘要】：在油田钻井中,钻柱经常会产生各种形式的振动。尤其在深井钻井时,钻柱的纵向振动特别明显。剧烈的钻柱纵向振动不仅会增加钻井成本,甚至影响钻井安全。为了解决这一问题,必须要分析深井钻柱振动纵向动态响应。根据实际钻井情况,建立深井钻柱纵向振动的力学模型,并对其进行理论分析。利用运动的偏微分方程和钻柱系统的边界条件推导出深井钻柱纵向振动的固有频率公式,通过VB语言对深井钻柱纵向振动固有频率公式进行计算机编程求解,从理论上得出深井钻柱纵向振动的固有频率。利用ANSYS有限元软件,建立深井钻柱纵向振动的有限元模型,对该模型进行模态分析,得到深井钻柱纵向振动的固有频率。对比理论得到的深井钻柱纵向振动固有频率和模态分析得到的深井钻柱纵向振动固有频率,发现二者之间误差很小。通过对深井钻柱纵向振动固有频率的分析得到深井钻柱纵向振动的各阶频率分布规律。在模态分析的基础上,对深井钻柱纵向振动有限元模型施加不同大小的周期性钻压,进行谐响应分析,得到深井钻柱纵向共振频率与位移关系的响应谱线。在动态响应谱线上可以清晰地观察到深井钻柱发生纵向共振的频率和共振时的位移,发现深井钻柱纵向共振的位移与所施加的钻压大小有关,还发现深井钻柱实际发生纵向共振的频率与深井钻柱纵向振动固有频率相吻合。所以不仅可以利用调节钻压来调节深井钻柱纵向共振的振动强度,还可以利用钻头转速与激振频率转换公式得到引起深井钻柱发生纵向共振时所达到的转速值,通过调节转速来避免共振的发生。
[Abstract]:In the drilling well of the oil field, the drill string often produces various forms of vibration. Especially in the deep well drilling, the longitudinal vibration of the drill string is particularly obvious. The intense longitudinal vibration of the drill string not only increases the drilling cost, but also affects the drilling safety. In order to solve this problem, it is necessary to analyze the longitudinal dynamic response of the drill string in the deep well. The mechanical model of longitudinal vibration of deep well drill string is established and analyzed theoretically. The inherent frequency formula of longitudinal vibration of deep well drill string is derived by using the partial differential equation of motion and the boundary condition of the drill string system. The VB language is used to solve the common frequency common frequency of the longitudinal vibration of the drill string in deep well. The natural frequency of longitudinal vibration of deep well drill string is used to establish a finite element model of longitudinal vibration of deep well drill column by ANSYS finite element software. The modal analysis of the model is carried out to obtain the inherent frequency of longitudinal vibration of deep well drillstring. The longitudinal vibration of deep well drill column longitudinal vibration obtained by comparison theory and the longitudinal vibration of deep well drill string obtained by the analysis of the theory of deep well drill string It is found that the error between the two is very small. Through the analysis of the inherent frequency of the longitudinal vibration of the deep well drill string, the frequency distribution of the longitudinal vibration of the deep well drill string is obtained. On the basis of the modal analysis, the circumferential drilling pressure of different sizes is applied to the finite element model of the longitudinal vibration of the deep well drill string, and the harmonic response analysis is carried out to get the deep well. The response spectrum lines of the relationship between the longitudinal resonance frequency and the displacement of the drill string can be found clearly on the dynamic response spectrum line, the longitudinal resonance frequency and the resonance displacement of the deep well drill string can be clearly observed. It is found that the displacement of the longitudinal resonance of the deep well drill string is related to the magnitude of the pressure applied, and the frequency and depth of the longitudinal resonance in the deep well drill string is also found. The inherent frequency of the longitudinal vibration of the drill string is consistent. So it can not only adjust the vibration intensity of the longitudinal resonance of the deep well drill string by adjusting the drilling pressure, but also can make use of the conversion formula of the bit speed and the excitation frequency to get the speed value of the longitudinal resonance of the deep well drill string, and avoid the resonance by adjusting the speed of the drill.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE921.2

【参考文献】