塔里木油田山前地区地层复杂,井深普遍在 7 000 m 以上,起下钻频繁,因起下钻造成的波动压力而导致的井下复杂事故也明显增加,致使建井周期和费用大幅度增加,为此研制了 9 000 m 四单根立柱超深井钻机.首先用三维设计软件对四单根立柱钻机井架进行实体建模,然后应用 ANSYS 对井架进行动力学分析,主要包括模态分析、谐响应和瞬态响应等.分析结果表明,天车、二层台和辅助二层台位置在前开口方向上的位移大于在井架两侧方向上的位移,需要注意井架在低频段的前倾变形;人字架处的各向位移很小,说明人字架在钻井过程中不会产生较大的受迫振动.在瞬态冲击载荷的作用下,二层台的响应位移最大,响应时间最长,需加强支撑.动力学分析为四单根立柱钻机井架的优化设计、强度校核和安全性评定提供了依据.%The submountain region of Tarim Oilfield has complex stratum and the shaft depth is generally more than 7 000 m, which leads to frequent tripping and consequent downhole accidents due to fluctuation pressure during tripping, as well as the shaft construction period and cost increased significantly, thus 9 000 m ultra-deep shaft drill rig with quadruple standpipe was developed. First, 3D design software was applied to build the solid model of the quadruple-standpipe derrick of the drill rig, and then ANSYS was applied to conduct dynamics analysis on the derrick mainly including modal analysis, harmonic response and transient response. The analysis results showed: the displacement of the crane, racking board and auxiliary racking board in the front opening direction of the derrick was greater than their displacement in both side of the derrick, and the forward deformation of the derrick at low frequency should be pay more attention; the little deformation of the A-shaped frame at various direction showed the A-shaped frame would not produce large forced vibration in the process of drilling. Under the action of transient impact load, the response deformation of the racking board was the largest and the response duration was the longest, so it was necessary to strengthen supporting. The dynamics analysis offered reference for the optimization design, strength checking and safety assessment of the quadruple-standpipe derrick of the drill rig.
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