复合钻井钻柱动力学特性研究

发布时间：2018-02-24 13:48

本文关键词： 复合钻井钻柱振动动力学井斜控制有限元分析　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：当今,螺杆钻具匹配PDC钻头的复合钻井技术已经成为钻井工程领域的主流工艺技术,大量的现场应用证明其能够有效地提高钻井速度、缩短钻井周期、降低钻井综合成本。本文收集和调研了大量复合钻井、钻柱动力学等方面的相关文献资料,通过分析这些资料并结合钻井现场实际情况,了解了该领域的发展趋势,明确了本文的研究方法和思路。在前人研究的基础上,根据复合钻井自身的特点,建立了钻柱纵向振动、横向振动、扭转振动的有限元模型,研究了钻柱模态变化规律和振型,计算了钻柱动态响应特征。利用非线性动力学原理,建立了复合钻井下部钻柱—钻头—地层的三维有限元数值模型。最后,结合现场定向钻井所遇到复合钻井井斜控制问题,分析了钻压、螺杆弯角、稳定器安装位置等因素对复合钻井井斜控制能力的影响规律。本文研究成果为复合钻井动力学研究、复合钻井井斜控制能力分析开辟了新的思路,为复合钻井的进一步发展和应用提供了理论基础和技术保障。本文主要研究内容和取得的成果如下： (1)根据非线性振动理论为基础,建立了复合钻井钻柱全井段有限元模型,计算出了钻柱纵向振动、横向振动、扭转振动的固有频率和各阶振型,并进行了谐响应分析。通过计算分析得了复合钻井钻柱的纵、横、扭各阶固有频率以及各阶响应位移随井深的变化关系。通过谐响应分析计算了在不同激振频率下,复合钻井钻柱的共振特性,得到了其共振时的响应位移和响应应力,据此可以判断钻柱的危险点位置。 (2)建立了复合钻井下部钻柱一钻头—地层—井壁的三维有限元模型,并通过给“地层”施加反向的转速来等效螺杆的转速,使模型更接近于真实的复合钻井工况。采用ABAQUS显示积分算法进行求解,研究了复合钻井工况时下部钻柱与井壁的碰撞力、钻头与井底岩石接触产生的轴向力的特点；复合钻井对下部钻柱纵、横向加速度的影响规律；复合钻井对钻柱扭矩和动态应力的影响。 (3)对复合钻井井斜控制问题进行了研究。结合钻井现场数据,建立了相应的复合钻井下部钻具组合有限元模型,分析了钻压、螺杆弯角、稳定器安装位置等因素对复合钻井井斜控制能力的影响规律,仿真结果与实际工况基本吻合,为优化复合钻井下部钻具结构提供了理论依据,可有效的指导现场施工
[Abstract]:Nowadays, the compound drilling technology of screw drill tool matching PDC bit has become the mainstream technology in drilling engineering field. A large number of field applications have proved that it can effectively improve the drilling speed and shorten the drilling period. In order to reduce the comprehensive cost of drilling, this paper collects and investigates a large number of related documents on compound drilling, drill string dynamics, and so on. By analyzing these data and combining with the actual situation of drilling site, we understand the development trend in this field. The research methods and ideas of this paper are clarified. On the basis of previous research, according to the characteristics of compound drilling, the finite element models of longitudinal, transverse and torsional vibration of drill string are established, and the modal variation law and mode shape of drill string are studied. The dynamic response characteristics of drill string are calculated. Based on the nonlinear dynamic principle, a three-dimensional finite element numerical model of drilling string, drill bit and formation in the lower part of composite drilling is established. The effects of drilling pressure, screw bending angle and stabilizer installation on the control ability of compound drilling well are analyzed. The research results of this paper have opened up a new way of thinking for the study of compound drilling dynamics and the analysis of compound drilling well deviation control ability. It provides the theoretical basis and technical guarantee for the further development and application of compound drilling. The main contents and achievements of this paper are as follows:. 1) based on the nonlinear vibration theory, the finite element model of the whole section of drilling string in compound drilling is established, and the natural frequencies and modes of the longitudinal vibration, transverse vibration and torsional vibration of the drill string are calculated. The relationship between the natural frequencies of longitudinal, transverse and torsional drill string and the displacement of each order response with well depth is obtained. The harmonic response analysis is used to calculate the relationship between the natural frequency and the displacement of the drill string at different exciting frequencies. The resonance characteristics of the drill string in compound drilling have obtained the response displacement and the response stress of the drill string during the resonance, and the dangerous point position of the drill string can be judged according to the response displacement and the response stress of the drill string. In this paper, a three-dimensional finite element model of drill string, drill bit and wellbore in the lower part of compound drilling is established, and the rotating speed of screw is equivalent by applying reverse rotation speed to formation. ABAQUS display integral algorithm is used to solve the model. The collision force between the lower drill string and the shaft wall and the axial force caused by the contact between the drill bit and the bottom rock during the combined drilling condition are studied. The influence of compound drilling on the longitudinal and lateral acceleration of the lower drill string and the influence of compound drilling on the drilling string torque and dynamic stress. Based on the drilling site data, the combined finite element model of the lower drilling tool is established, and the drilling pressure and screw bending angle are analyzed. The influence of stabilizer installation position on the deviation control ability of composite drilling wells is basically consistent with the actual working conditions. The simulation results provide a theoretical basis for optimizing the structure of drilling tools in the lower part of composite drilling, which can effectively guide the field construction.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE242.9

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