摘要
大位移水平井管柱下放时需要克服管柱与井壁之间的摩阻力,限制作业管柱的入井深度及大位移水平段的延伸距离,振动工具虽然可以在一定程度上降低管柱摩阻力,但其工程应用依据还不充分。根据不同工况,运用数值仿真方法,分析横向、轴向、扭转及其组合振源对管柱轴向力传递效率的影响规律。结果表明,单一振源对管柱轴向力传递效率在12.5%~64.5%之间,其中效果显著的振源频率为1Hz、线位移幅值为3mm的横向X振动或角位移幅值为π/6的扭转振动,计算得到两种及三种振源组合传递效率在44.0%~85.0%之间;两种振源的最佳组合为轴向加扭转,最大传递效率为74.0%,三种振源的最佳组合为横向X加轴向加扭转,最大传递效率为85.5%;比单一振源提升21.0%~31.5%,其中无间隙状态下提升幅度最大。该结果可为大位移水平井作业管柱振动减阻技术的应用提供技术参考。
When the tube is laid down in large displacement horizontal well,the friction between the tube and the borehole wall needs to be overcome,thus limiting the tube horizontal well depth.Vibration tools can reduce the tube friction to a certain extent,but not sufficient basis for engineering applications.According to different cases,using numerical simulation method,we analyzed tube axial force transfer efficiency under lateral,axial,torsional and combination vibration source.The results show that the axial force improves when the single vibration source is between 12.5%~64.5%.The significantly vibration frequency is 1Hz,line displacement amplitude 3mm horizontal Xvibration and angular displacement amplitudeπ/6torsional vibration.According to frequency and amplitude,two and three kinds the combination vibration source improve axial force between 44.0%~85.0%.The best two kinds combination is axial plus torsional,the maximum improvement efficiency is 74.0%.The best three kinds combination is horizontal Xplus axial plus torsional,the maximum improvement efficiency is 85.5%.Combination vibration source enhance the 21.0%~31.5% than single,with no gap state to enhance the maximum range.This result provides a technical reference for the vibration reduction friction technology for large displacement horizontal wells.
出处
《东北石油大学学报》
CAS
北大核心
2017年第3期94-102,共9页
Journal of Northeast Petroleum University
基金
国家自然科学基金项目(51674088)
关键词
水平井
管柱
摩阻力
强迫振动
轴向力
传递效率
数值仿真
horizontal well
tube
friction
vibration
axial force
transfer efficiency
numerical simulation
作者简介
刘巨保(1963-),男,博士,教授,主要从事井下管柱力学及应用软件开发、井下专用工具等方面的研究
