三牙轮钻头轴承结构强度分析与参数研究

发布时间：2018-03-13 10:01

本文选题：牙轮钻头　切入点：轴承结构　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：牙轮钻头在井底的工作条件较为恶劣,主要承受轴向振动载荷、扭转振动载荷和横向振动载荷,轴承失效是牙轮钻头失效的主要原因。随着深井和超深井的不断增多,深部地层钻进需要的小尺寸三牙轮钻头越来越多,要求轴承能适应高钻压、高转速。但小尺寸三牙轮钻头布齿空间极其有限、壳体厚度较小,且牙爪轴承尺寸相对较小,为了提高钻速,在高钻压、高转速下常常发生轴承失效。因此,对小尺寸牙轮钻头轴承结构进行分析研究,具有极其重要的意义。本文以小尺寸三牙轮钻头为研究对象,建立了包含牙爪、牙轮和牙齿的牙轮钻头轴承模型,用ABAQUS有限元分析软件进行静强度分析,获得了轴承结构Mises应力和接触压力分布情况；用Fe-Safe软件作轴承结构疲劳强度分析,获得了轴承结构疲劳寿命和安全系数；用DOE试验设计技术,通过改变轴承结构大轴颈长度、小轴颈长度、大轴颈直径和小轴颈直径的不同尺寸,对牙轮钻头轴承结构开展结构参数敏感性研究,分析了交互作用对轴承结构参数敏感性的影响,并根据参数变化对牙轮钻头轴承结构强度的影响,对轴承结构参数作优化研究。通过以上对小尺寸三牙轮钻头轴承结构的分析,建立了牙轮钻头轴承结构静强度、疲劳强度的分析规范和评价指标,确定轴承结构参数变化对轴承静强度和疲劳强度的影响,最终得到合理的轴承结构设计参数,对指导小尺寸牙轮钻头轴承结构设计、开发牙轮钻头具有较大的意义。
[Abstract]:The working conditions of cone bit at the bottom of the hole are relatively bad, mainly bearing axial vibration load, torsional vibration load and transverse vibration load. Bearing failure is the main cause of cone bit failure. More and more small size three-cone bits are needed for drilling in deep formation, which requires bearings to adapt to high drilling pressure and high rotation speed. However, small size three-cone bits have extremely limited space for tooth distribution, smaller shell thickness, and relatively small size of claw bearings. In order to improve the drilling speed, bearing failure often occurs at high drilling pressure and high speed. Therefore, it is of great significance to analyze and study the bearing structure of small-sized cone bit. In this paper, the bearing model of small size three-cone bit is established, which includes claw, cone and tooth. The static strength of the bearing is analyzed by ABAQUS finite element analysis software. Mises stress and contact pressure distribution of bearing structure are obtained, fatigue life and safety factor of bearing structure are obtained by fatigue strength analysis of bearing structure with Fe-Safe software, and large journal length of bearing structure is changed by DOE test design technique. Different dimensions of small journal length, large journal diameter and small journal diameter, the structural parameter sensitivity of roller bit bearing structure is studied, and the influence of interaction on bearing structural parameter sensitivity is analyzed. According to the influence of the change of parameters on the structural strength of roller bit bearing, the structural parameters of bearing are optimized. Based on the above analysis of the bearing structure of the small size three-cone bit, the static strength and fatigue strength analysis criterion and evaluation index of the bearing structure are established, and the influence of the structural parameters of the bearing on the static strength and fatigue strength of the bearing is determined. Finally, reasonable design parameters of bearing structure are obtained, which is of great significance to guide the design of bearing structure of small size cone bit and to develop cone bit.
【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】：TE921.1

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