论文部分内容阅读
RWD随钻扩眼使钻井和扩眼过程一次完成,并满足大部分特定井身轨迹严格控制的要求,具有工具结构简单,无活动部件,扩眼尺寸稳定规则的特点,是解决复杂深井阻卡、非常规井身结构应用和提高固井质量的有效手段。随钻扩眼过程中,扩眼器与所扩地层之间的岩石力学耦合作用对随钻扩眼钻进破岩效果和扩眼器、钻柱的优化设计等至关重要。为此,建立了弹塑性有限元力学分析模型,运用莫尔-库仑强度准则,用数值分析的原理和方法模拟了随钻扩眼时扩眼器破岩的力学机理。并对井眼围岩变形和应力分析及强度进行了研究,为研究随钻扩眼的破岩规律和对扩眼器进行改进提供了一种方法和研究的基础。
RWD Recov- eral With Drilling and Reaming, RWD completes the drilling and reaming process in one go and meets the stringent control requirements for most well-specific wellbores. RWD has the features of a simple tool structure, no moving parts, , Unconventional application of wellbore structure and effective means of improving cementing quality. During the process of reaming, the rock mechanics coupling between the reamer and the caving formation is crucial for the rock breaking effect while reaming drilling and the reamer and the optimal design of the drill string. For this purpose, the elasto-plastic finite element mechanical analysis model was established, and the Mohr-Coulomb strength criterion was used to simulate the mechanical mechanism of the reamer shattering when the reamer was reaming with the principle and method of numerical analysis. The deformation and stress analysis and strength of the surrounding rock are studied. It provides a method and research basis for studying the rock breaking law while reaming and reaming.