摘要
建立了弯曲井眼中的钻柱模型,在模型中考虑了重力、钻井液浮力、曲率半径、井眼轨迹等因素,用有限元法对钻柱屈曲过程进行分析,通过调整扶正器安放位置,得到超刚性钻具组合,并与满眼钻具组合计算结果进行比较。结果表明,超刚性钻具的最大挠度比满眼钻具的最大挠度小,说明超刚性钻具的刚度比满眼钻具的刚度大,受钻压和转速的影响小,抗地层造斜能力强;钻压和转速对钻柱挠度都有影响,但转速影响比钻压大得多。
The drill string model in bending borehole is established, and the gravity, buoyance of drilling fluid, radius of curvature and well trajectory are considered in the model. The buckling course of drill string is analyzed by means of finite element method. By regulating the setting location of the centralizer, the ultra-rigid drill tool combination is obtained and compared with the calculation result of full-bore drill tool combination. The results show that the maximum deflection of ultra-rigid drill tool is smaller than that of the full-bore drill tool, which indicates that the rigidity of ultra-rigid drill tool is bigger than that of the full-bore drill tool, and less affected by the drill pressure and rotating speed and stronger in resisting the kick-off of formation. The drill pressure and rotating speed both have influence on the deflection of the drill string, but the influence of the rotating speed is bigger than that of the drill pressure.
出处
《石油机械》
北大核心
2008年第4期25-27,1,共3页
China Petroleum Machinery
基金
中国石油天然气集团公司石油科技中青年创新基金项目(05E7043)
四川省青年科技基金项目(07ZQ026-014)
教育部留学回国人员科研启动基金项目“山前推覆体钻具防断与打快机理研究”
关键词
屈曲分析
挠度
钻柱
有限元
扶正器
buckling analysis, deflection, drill string, finite element, centralizer
