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中文摘要：
在深井和大位移井钻进中,常常由于钻井周期长及狗腿度严重等问题导致套管和钻杆接头严重磨损甚至磨穿,带来安全隐患和巨大的经济损失。针对现有套管防磨工具使用寿命短和压耗大的问题,应用CAE和CFD技术分析了其过流压耗及间歇碰撞滚滑状态下的工作应力,提出了有针对性的改进措施,改进后结构的峰值工作应力和压耗分别减小20.8%和17.3%,可磨损体积增大14.0%;对挡圈及锁紧结构进行了优化设计,降低了其拆装难度。优化后的防磨工具压耗更小,可以有效减小套管和钻杆的磨损。
英文摘要：
During drilling deep wells and extended-reach wells,casing and drill string joint worn occurs frequently due to long drilling period and high dog leg severity,which brings high risks and economic loss.This paper used CAE CFD technology to analyze flow pressure loss and working stress under intermittent collision and skid state,and proposed measures for improvement correspondingly.After the improvement,working stress and pressure loss of structures were reduced by 20.8% and 17.3% respectively,worn volume was raised by 14.0%.The optimized design of retainer ring and locking structure reduced the dismounting difficulty.The optimized tool has a lower pressure loss,and can effectively reduce abrasion of casing and drill pipe.
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