旋转套管对大斜度井偏心环空顶替效率影响的研究  

Effect of Casing Rotation on Displacement Efficiency of Cement Slurry in Highly Deviated Wells

作　　者：李志彬 黄毓祥 倪益民 Li Zhbin;Huang Yuxiang;Ni Yimin(CNOOC Ener Tech-Drilling&Production Co.,Tianjin 300459)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300459

出　　处：《石化技术》2021年第9期44-45,共2页Petrochemical Industry Technology

摘　　要：基于赫巴模型,利用数值模拟方法研究了套管旋转与不旋转下密度差和偏心度对顶替效率和顶替界面的影响。结果表明,随着密度差或偏心度的增大,顶替效率先增大后减小。在相同的顶替条件下,旋转套管可以提高顶替效率。同时模拟分析了不同套管转速对顶替效率的影响。考虑固井要求和操作,建议套管转速为20r/min左右为宜。In the case of casing rotation and non-rotation,the influence of density difference and casing eccentricity on displacement efficiency and displacing interface in highly deviated wells have been numerically simulated based on Herschel-Bulkley model.The results indicate that the displacement efficiency increases first and then decreases as the density difference or casing eccentricity increases.Under the same displacement conditions,rotating casing can improve displacement efficiency.At the same time,the influence of different casing speed on displacement efficiency is analyzed by means of simulation.Considering cementing requirements and operation,it is recommended that the casing speed be about 20 r/min.

关 键 词：大斜度井 旋转套管 密度差 偏心度 顶替效率 

分 类 号：TE256[石油与天然气工程—油气井工程]