旋转流场下PDC钻头的数值模拟仿真

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英文篇名：CFD Numerical Simulation Analysis of PDC Bits in Rotating Flow Field 作者：王勇勇 ; 张帅 ; 王文娟 ; 吕澜涛 英文作者：Wang Yongyong;Zhang Shuai;Wang Wenjuan;Lu Lantao;College of Mechanical Engineering, Xi'an Shiyou University; 关键词：PDC钻头 ; 水力学 ; 数值模拟 ; 井底流场 ; 涡旋 英文关键词：PDC bit;;hydraulics;;numerical simulation;;bottom-hole flow field;;vortex 中文刊名：云南化工 英文刊名：Yunnan Chemical Technology 机构：西安石油大学; 出版日期：2019-09-04 09:52 出版单位：云南化工 年：2019 期：07 语种：中文; 页：180-181 页数：2 CN：53-1087/TQ ISSN：1004-275X 分类号：TE921.1

摘要

利用fluent软件对简化的PDC钻头进行了三维旋转流场和非旋转流场的数值仿真。结果表明:钻头底部流道的逆流,是由于井底的特殊形状,致使高速流体与井壁碰撞,在黏性力的作用下造成的;钻头四个喷嘴正对分布时,钻头底部中心的涡旋,是由于喷嘴对称分布,使四股流体经井底相互碰撞,在黏性力的作用下造成的。由于涡旋会降低钻井液的携岩能力并对钻头造成磨损,所以有必要减少涡旋的产生。
        In this paper, the fluent software is used to simulate the three-dimensional rotating flow field and the non-rotating flow field of the PDC bit. The analysis results show that the reverse flow in the flow channel at the bottom of the drill bit is mainly due to the special shape of the bottom hole, causing the high-speed fluid to collide with the well wall, which is caused by the viscous force; When the drill bit has four nozzles symmetrically, the vortex at the center of the bottom of the drill bit is mainly because of the nozzles symmetrically distributed, so that the four strings of fluid collide with each other after passing through the bottom of the well and caused the vortex with the help of the viscous force. Since the vortex can lose the energy of the drilling fluid and reduce the rock carrying capacity of the drilling fluid and cause wear of the drill bit, the generation of the vortex ought to be reduced.

引文

[1]谢翠丽，蒋旭平，陈康民. PDC钻头井下流动可视化实验研究与冲蚀分析[J].石油机械，2005,33(6):1-4.
    [2]黄红梅，翟应虎，王辉，等.实体PDC钻头流场数值模拟与实验验证[J].石油大学学报(自然科学版)，2005,29(3):49-52.
    [3] Charles Douglas, Brian Stanley. Steel-body PDC bit targets shale drilling[J]. Drilling Contractor. Jul. 2011.