牙轮钻头螺旋磁流体复合密封耐压机理

doi:10.7623/syxb202412010

石油学报 ›› 2024, Vol. 45 ›› Issue (12): 1851-1862.DOI: 10.7623/syxb202412010

牙轮钻头螺旋磁流体复合密封耐压机理

周已, 李天全, 周燚, 王儒晨

西南石油大学机电工程学院四川成都 610500

收稿日期:2024-06-01 修回日期:2024-10-21 出版日期:2024-11-25 发布日期:2025-01-03
通讯作者: 周已,女,1980年2月生,2009年获西南石油大学硕士学位,现为西南石油大学副教授,主要从事机械密封研究工作。Email:673871313@qq.com
作者简介:周已,女,1980年2月生,2009年获西南石油大学硕士学位,现为西南石油大学副教授,主要从事机械密封研究工作。Email:673871313@qq.com
基金资助:
国家自然科学基金青年科学基金项目(No.51604238)资助。

Pressure resistance mechanism for spiral magnetic fluid composite seal of cone bit

Zhou Yi, Li Tianquan, Zhou Yi, Wang Ruchen

School of Mechatronic Engineering, Southwest Petroleum University, Sichuan Chengdu 610500, China

Received:2024-06-01 Revised:2024-10-21 Online:2024-11-25 Published:2025-01-03

摘要/Abstract

摘要： 牙轮钻头螺旋磁流体复合密封结构具有主动排砂、自动补偿封浆效应等优点,是一种新型的牙轮钻头密封结构,耐压性能则是决定该新型密封性能的关键。因此,构建了牙轮钻头螺旋磁流体复合密封的磁场和磁流耦合的数值仿真模型,从磁通密度、磁感应强度、理论耐压值的角度实现了牙轮钻头螺旋磁流体复合密封耐压能力和密封性能的全过程,主要研究了工况参数(转速、温度)对新型密封耐压性能的影响规律。通过数值模拟发现,磁力线在极靴顶部处分布密集,能够实现聚磁效果,极靴顶部处的磁场强度将高于密封间隙处;磁通密度在极靴顶部位置上的磁场强度大小明显高于其他位置;在每个极靴顶部处都具有较高且相近的磁感应强度,极靴顶部处的磁感应强度最大,达到3.697 8 T,而齿槽处和密封间隙处的磁感应强度为0.24 T,极靴顶部处存在较大的磁感应强度梯度。根据理论耐压计算得到理论耐压值为1.09 MPa,验证了密封结构设计的可行性。随着转速和温度的增加,整个密封结构的耐压能力降低。与转速相比,温度对于密封结构耐压性能的影响较小。通过开展试验研究,验证了牙轮钻头螺旋磁流体复合密封的耐压性能,揭示了工况参数对其耐压性能的影响规律,试验结果和仿真结果相符合。

关键词: 牙轮钻头, 螺旋磁流体复合密封, 磁场模拟, 磁流耦合模拟, 试验研究

Abstract: The spiral magnetic fluid composite seal structure of the cone bit is characterized by active sand removal and automatic compensation for slurry sealing effect, as being a new seal structure for cone bit. Pressure resistance is the key to determine the performance of this new seal structure. Therefore, the paper constructs a numerical simulation model of magnetic field and magnetic fluid coupling for the spiral magnetic fluid composite seal of cone bit, and the whole process of pressure resistance and sealing performance of the spiral magnetic fluid composite seal is achieved in terms of magnetic flux density, magnetic induction intensity and theoretical pressure resistance. The study focuses on the influence law of working condition parameters (speed and temperature)on the pressure resistance of the new seal. Numerical simulation reveals that the magnetic lines of force are densely distributed at the top of pole shoe, which can achieve poly magnetic effect, and the magnetic field intensity at the top of the pole shoe will be higher than that at the seal gap; the magnetic flux density at the top of pole shoe is significantly higher than that at the other positions; the magnetic induction intensity at the top of each pole shoe is high and similar, and the magnetic induction intensity at the top of pole shoe is the largest, and can reach up to 3.697 8 T, while that at both tooth space and seal gap is 0.24 T. In addition, there is a large magnetic induction intensity gradient at the top of pole shoe. The theoretically calculated pressure resistance value is 1.09 MPa, which has verified the feasibility of the seal structure design. As the speed and temperature rise, the pressure resistance of the whole seal structure drops. Compared with speed, temperature has less influence on the pressure resistance of the seal structure. The pressure resistance of the spiral magnetic fluid composite seal of cone bit is verified by experimental studies, and the influence law of working condition parameters on the pressure resistance is also revealed, from which it can be see that the experimental results are consistent with the simulation results.

Key words: cone bit, spiral magnetic fluid composite seal, magnetic field simulation, magnetic fluid coupling simulation, experimental study

中图分类号:

TE92

周已, 李天全, 周燚, 王儒晨. 牙轮钻头螺旋磁流体复合密封耐压机理[J]. 石油学报, 2024, 45(12): 1851-1862.

Zhou Yi, Li Tianquan, Zhou Yi, Wang Ruchen. Pressure resistance mechanism for spiral magnetic fluid composite seal of cone bit[J]. Acta Petrolei Sinica, 2024, 45(12): 1851-1862.

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牙轮钻头螺旋磁流体复合密封耐压机理

Pressure resistance mechanism for spiral magnetic fluid composite seal of cone bit

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