摘要
连续管钻井过程中,底部钻具组合无钻铤,钻压施加困难。为此,设计了一种适用于88.9 mm微小井眼连续管钻井的73 mm三级水力加压器,建立了水力加压器串联在涡轮钻具上方时产生的轴向推力计算模型。为了延长水力加压器的工作寿命,设计了密封性能优良的车氏密封结构;主活塞杆与主缸体之间采用矩形花键连接方式,并进行了矩形花键连接副的接触应力分析。计算与分析结果表明,在钻井液排量5.0~6.0 L/s、密度1.05~1.20 g/cm3条件下可产生50~90 kN的轴向推力,完全满足88.9 mm微小井眼连续管钻井需要。
It is difficult to provide WOB because of no drill ing. Therefore, a kind of Ф73 mm three-stage hydraulic thruster collar on BHA in the process of coiled tubing drillsuitable for the Ф88.9 mm micro-hole coiled tubing drilling was designed. The calculation model for the axial thrust of the thruster series connection which is produced above turbo-drill was established. The Che' s seal structure with excellent sealability was designed in order to lengthen the service life of the thruster. The rectangular spline was adopted as the connection mode between the main piston rod and the cylinder body. The contact stress analysis of the rectangular spline connection pair was conducted. The calculation and analysis show that the axial thrust of 50 - 90 kN will be produced when the drilling fluid displacement is 5.0 -6.0 L/s and the density is 1.05 - 1.20 g/cm3 , which completely satisfies the requirement of Ф88.9 mm micro-hole coiled tubing drilling.
出处
《石油机械》
北大核心
2012年第11期15-18,共4页
China Petroleum Machinery
基金
国家科技重大专项"复杂结构井优化设计与控制关键技术"(2011ZX05009-005)
关键词
连续管钻井
微小井眼
水力加压器
车氏密封
矩形花键
有限元分析
coiled tubing drilling
micro-hole
hydraulic thruster
Che' s seal
rectangular spline
finite element analysis