特种油气藏 ›› 2023, Vol. 30 ›› Issue (5): 158-165.DOI: 10.3969/j.issn.1006-6535.2023.05.021

• 钻采工程 • 上一篇    下一篇

定向双齿结构对PDC钻头破岩效率及侧向力的影响

盖京明1, 李玮1,2, 刘刚军3, 郑瑞强4, 李兵4, 陈子贺4   

  1. 1.东北石油大学,黑龙江 大庆 163318;
    2.油气钻完井技术国家工程研究中心,北京 102206;
    3.中国石油集团西部钻探工程有限公司,新疆 克拉玛依 834000;
    4.中国石油大庆钻探工程公司,黑龙江 大庆 163413
  • 收稿日期:2022-07-29 修回日期:2023-06-26 出版日期:2023-10-25 发布日期:2023-12-25
  • 通讯作者: 李玮(1979—),男,教授,博士生导师,2003年毕业于大庆石油学院石油工程专业,2010年毕业于东北石油大学油气井工程专业,获博士学位,现从事高效钻井破岩、水力压裂、钻井优化等方面的研究工作。
  • 作者简介:盖京明(1996—),男,2018年毕业于东北石油大学石油工程专业,现为该校石油与天然气工程专业在读博士研究生,主要从事油气井岩石力学方面的研究工作。
  • 基金资助:
    国家自然科学基金“万米深井PDC钻头冲击破岩机理及提速方法研究”(52274005)

Effect of Directional Double-Tooth Structure on Rock-Breaking Efficiency and Lateral Force of PDC Drill Bit

Gai Jingming1, Li Wei1,2, Liu Gangjun3, Zheng Ruiqiang4, Li Bing4, Chen Zihe4   

  1. 1. Northeast Petroleum University,Daqing,Heilongjiang 163318,China;
    2. National Engineering Research Center for Oil and Gas Drilling and Completion Technology,Beijing,102206,China;
    3. CNPC Western Drilling Engineering Co.,Ltd.,Karamay,Xinjiang 834000,China;
    4. PetroChina Daqing Exploratory Drilling Engineering Company,Daqing,Heilongjiang 163413,China
  • Received:2022-07-29 Revised:2023-06-26 Online:2023-10-25 Published:2023-12-25

摘要: 针对钻头在软硬夹层中钻进时,由于PDC钻头破岩效率低以及侧向力激增引发钻柱横向振动和涡动,导致钻头过早失效的问题,设计了一种具有定向双齿结构的PDC钻头,并通过双齿切削有限元模拟,研究了不同布齿参数的定向双齿结构对破岩效率和局部侧向力平衡的影响。结果表明:定向双齿结构能够有效提高破岩效率,双齿间距对机械比功的影响较小,相比单齿切削机械比功减小约5.60%~6.50%;双齿夹角能够显著影响机械比功,当双齿夹角为160 °时,相比单齿切削,机械比功减小约96.36%~113.82%;相同侧转角情况下,双齿夹角布齿的侧向力比单齿切削减小约33.40%~74.20%,能够有效提高钻头在过渡地层和定向钻井时的局部侧向力平衡,从而提高钻头整体力平衡效果。该研究可为PDC钻头布齿优化设计提供参考和依据。

关键词: 定向双齿, PDC钻头, 机械比功, 侧向力平衡, 软硬夹层, 深层, 超深层

Abstract: To address the problem of premature failure of PDC drill bit due to low rock-breaking efficiency and lateral vibrations and swirls of drill string caused by lateral force surge when drilling in soft and hard interbedded layer,a PDC drill bit with directional double-tooth structure was designed,and the effects of the directional double-tooth structure with different tooth arrangement parameters on rock-breaking efficiency and local lateral force balance were investigated by the finite element simulation of double-tooth cutting. The results show that the directional double-tooth structure can effectively improve the rock-breaking efficiency,the double-tooth spacing has less effect on the mechanical specific power,compared with the single-tooth cutting,the mechanical specific power is reduced by about 5.60%-6.50%; the double-tooth clamping angle can significantly affect the mechanical specific power,when the double-tooth clamping angle is 160 °,compared with the single-tooth cutting,the mechanical specific power is reduced by about 96.36%-113.82%; under the same side turning angle,the lateral force of the double-tooth clamping angle tooth arrangement is reduced by about 33.40%-74.20% compared with that of the single-tooth cutting,which can effectively improve the local lateral force balance of the drill bit in the transitional formation and directional drilling,and thus improve the overall force balance effect of the drill bit. This study can provide a reference and basis for the optimized design of the tooth arrangement of the PDC drill bit.

Key words: directional double-tooth, PDC drill bit, mechanical specific power, lateral force balance, soft and hard interbedded layer, deep formation, ultra-deep formation

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