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脊形PDC齿的机械性能和破岩效果

谢志涛 赵宇璇 郭勇 吴德胜 李亚东

谢志涛, 赵宇璇, 郭勇, 吴德胜, 李亚东. 脊形PDC齿的机械性能和破岩效果[J]. 金刚石与磨料磨具工程, 2024, 44(5): 599-606. doi: 10.13394/j.cnki.jgszz.2023.0172
引用本文: 谢志涛, 赵宇璇, 郭勇, 吴德胜, 李亚东. 脊形PDC齿的机械性能和破岩效果[J]. 金刚石与磨料磨具工程, 2024, 44(5): 599-606. doi: 10.13394/j.cnki.jgszz.2023.0172
XIE Zhitao, ZHAO Yuxuan, GUO Yong, WU Desheng, LI Yadong. Mechanical properties and rock-breaking effects of ridge-shaped PDC teeth[J]. Diamond & Abrasives Engineering, 2024, 44(5): 599-606. doi: 10.13394/j.cnki.jgszz.2023.0172
Citation: XIE Zhitao, ZHAO Yuxuan, GUO Yong, WU Desheng, LI Yadong. Mechanical properties and rock-breaking effects of ridge-shaped PDC teeth[J]. Diamond & Abrasives Engineering, 2024, 44(5): 599-606. doi: 10.13394/j.cnki.jgszz.2023.0172

脊形PDC齿的机械性能和破岩效果

doi: 10.13394/j.cnki.jgszz.2023.0172
详细信息
    作者简介:

    谢志涛,男,1988年生。主要研究方向:油气井工程技术。E-mail:karamaysy@163.com

  • 中图分类号: TQ164; TG74; TE921

Mechanical properties and rock-breaking effects of ridge-shaped PDC teeth

  • 摘要: 以地层特性为依据有针对性地选择PDC异形齿,可以降低其失效的概率并提高其机械钻速和进尺。为了综合对比脊形PDC齿的机械性能和破岩效果,对165斧形、135斧形、三刃3种脊形PDC齿的耐磨性能和抗冲击性能进行测试,随后选择花岗岩进行3个吃入深度的单齿切削试验和不同压力下的全尺寸钻头模拟钻进试验,并与普通圆形齿的结果进行对比。结果表明:3种脊形PDC齿的耐磨性能均优于圆形齿的;165斧形齿与三刃齿的抗冲击性能优于圆形齿的,而135斧形齿的冲击点缺少材料支撑,其抗冲击性能较差。在相同吃入深度下,脊形齿的切向力与法向力均低于圆形齿的相应力,且脊角越小切削力越小。135斧形齿的机械钻速最快且适合高钻压;与165斧形齿比较,三刃齿在≤20.0 kN的低钻压下机械钻速较快,在>20.0 kN的高钻压下机械钻速较慢;圆形齿的机械钻速最慢,所适合的钻压也较低。同时,当脊形齿的脊角变化时,其冲击点的材料支撑也发生改变,进而影响其抗冲击性能;且脊角变化会改变前方岩石内部的应力集中,进而改变其破岩效果。

     

  • 图  1  试验用立式转塔车床

    Figure  1.  Vertical turret lathe for testing

    图  2  试验用落锤冲击试验机

    Figure  2.  Drop hammer impact testing machine for testing

    图  3  模拟钻机局部照片

    Figure  3.  Partial photo of simulated drilling machine

    图  4  试验用圆形齿和脊形齿

    Figure  4.  Round and ridge-shaped teeth for testing

    图  5  PDC齿金刚石层截面形貌

    Figure  5.  Cross section topography of PDC tooth diamond layer

    图  6  PDC齿与岩石找平

    Figure  6.  PDC cutter aligned with rock

    图  7  4种PDC齿磨口

    Figure  7.  Wear flat of four PDC teeth

    图  8  VTL湿磨的磨损面积

    Figure  8.  Wear area of VTL wet grinding

    图  9  脊形齿与圆形齿差异示意图

    Figure  9.  Schematic diagram of difference between ridge-shaped tooth and round tooth

    图  10  PDC齿的断裂能

    Figure  10.  PDC teeth fracture energy

    图  11  4种齿断口形貌

    Figure  11.  Fracture morphologies of four teeth

    图  12  不同吃入深度下的切削力

    Figure  12.  Cutting forces at different penetration depths

    图  13  4种PDC齿钻头在不同钻压下的机械钻速

    Figure  13.  Mechanical drilling speede of four PDC tooth bits under different drilling pressures

    表  1  花岗岩岩样的基本力学性能参数

    Table  1.   Basic mechanical property parameters of granite samples

    参数取值
    密度 ρ / (g·cm−3)2.6
    单轴抗压强度 σ / MPa204.41
    弹性模量 E1 / GPa40.37
    泊松比 ε0.28
    黏聚力 E2 / MPa44.12
    内摩擦角 θ / (°)53.51
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-08-26
  • 修回日期:  2023-10-23
  • 录用日期:  2023-11-06
  • 网络出版日期:  2023-11-06
  • 刊出日期:  2024-10-01

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