带压作业卡瓦接触特性分析及夹持性能评价
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1.四川科特检测技术有限公司;2.西南石油大学机电工程学院

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A

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国家自然科学基金(51775463)


Analysis of Contact Characteristics and Clamping Performance Evaluation of Slip used for snubbing service
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Sichuan KETE Testing Technology Co,Ltd

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    摘要:

    针对螺旋升角型卡瓦齿的卡瓦与管柱接触特性不清晰而造成卡瓦夹持性能无法准确评价等问题,采用理论方法分析卡瓦管柱相互作用受力,通过数值模拟方法,建立卡瓦-管柱-卡瓦座全尺寸相互接触有限元模型,开展了不同轴向载荷和摩擦系数下卡瓦和管柱的Mises应力和接触应力分布规律等接触特性研究,得到在轴向上,由底部往顶部逐渐减小,在周向上为非完成对称分布,且存在应力集中位置,卡瓦与管柱相比所受的Mises应力较大,接触应力较小;随着轴向载荷增大,Mises应力和接触应力都增大,随着摩擦系数的增大,Mises应力和接触应力都减小;在设计和实际使用中应着重考虑应力较大的部件和位置,在大载荷工况下,建议通过改变卡瓦材料、卡瓦齿形状等方式来增大摩擦系数,从而提高卡瓦在大载荷工况下的夹持性能,同时又可防止夹持力过大造成管柱被咬合过深而损坏。以上结果可为卡瓦的设计及夹持性能的评价提供理论指导。

    Abstract:

    To solve the problem of unclear contact characteristics between the slip with spiral rising angle teeth and the pipe column, which leads to an inaccurate evaluation of the clamping performance of the slip. In this paper, the theoretical method is used to analyze the forces acting on the interaction between slip and columns. Using numerical simulation methods, a full-scale finite element model of the interaction between the slip, pipe column, and slip seat was established. The Mises stress and contact stress distribution patterns of the slip and pipe column under different axial loads and friction coefficients were studied. It gradually decreases from the bottom to the top in the axial direction. It is an imperfect symmetric distribution in the circumferential direction and there are stress concentration locations. The slip is subjected to higher Mises stress and lower contact stress than the pipe column. As the axial load increases, the Mises and contact stress increase. As the friction coefficient increases, the Mises and contact stress decrease. In design and practical use, emphasis should be placed on components and locations with high-stress levels. Under high load conditions, increasing the friction coefficient by changing the material and shape of the slip teeth is recommended. Thus improving the clamping performance of the slip under high load conditions, while also preventing damage to the pipe column caused by excessive clamping force. The above results can provide theoretical guidance for the design of slips and the evaluation of clamping performance.

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王皓,廖飞龙,王文权,等. 带压作业卡瓦接触特性分析及夹持性能评价[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-12-04
  • 最后修改日期:2024-06-14
  • 录用日期:2024-06-24
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