Numerical Simulation on Thread Stress Distribution and Load Sensitivity of Drill Collars in Ultra-Deep Wells

Kuang Xianren; Cui Yongxing; Tian Ming; Du Yang; Tang Jiaxin

doi:10.12473/CPM.202506036

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Numerical Simulation on Thread Stress Distribution and Load Sensitivity of Drill Collars in Ultra-Deep Wells

DRILLING TECHNOLOGY AND EQUIPMENT | 更新时间：2026-10-15

- Numerical Simulation on Thread Stress Distribution and Load Sensitivity of Drill Collars in Ultra-Deep Wells
- China Petroleum Machinery Vol. 54, Issue 9, Pages: 19-28(2026)
- 作者机构：
  
  1.中国石油集团工程材料研究院有限公司
  2.中国石油天然气股份有限公司塔里木油田分公司
  3.中国石油大学（华东）机电工程学院
- 作者简介：
- 基金信息：
- DOI：10.12473/CPM.202506036
  CLC： TE924
- Received：13 June 2025，
  
  Revised：2026-03-16，
  
  Accepted：01 August 2025，
  
  Published：25 September 2026
- 稿件说明：
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邝献任，崔永兴，田明，等.超深井钻铤螺纹应力分布及载荷敏感度模拟研究［J］.石油机械，2026，54（9）：19-28.

Kuang XianRen，Cui YongXing，Tian Ming，et al.Numerical simulation on thread stress distribution and load sensitivity of drill collars in ultra-deep wells［J］.China Petroleum Machinery，2026，54（9）：19-28.
邝献任，崔永兴，田明，等.超深井钻铤螺纹应力分布及载荷敏感度模拟研究［J］.石油机械，2026，54（9）：19-28. DOI： 10.12473/CPM.202506036.

Kuang XianRen，Cui YongXing，Tian Ming，et al.Numerical simulation on thread stress distribution and load sensitivity of drill collars in ultra-deep wells［J］.China Petroleum Machinery，2026，54（9）：19-28. DOI： 10.12473/CPM.202506036.

摘要

钻铤作为连接钻柱与钻头的关键传力构件，在万米级深井极端载荷作用下存在瞬时强度失效与疲劳断裂风险，制约着安全高效钻进。为了研究万米深井钻铤螺纹的应力分布及载荷敏感性，对万米深井钻铤服役工况下的扭矩、钻井液压力、轴向载荷及弯矩载荷进行计算，进而建立包含真实螺纹结构的三维实体钻铤有限元模型；研究高弯矩作用下外螺纹根部的应力分布特征及强度失效机制，量化钻铤上扣过程与正常钻探工况的应力集中特性；研究扭矩波动与交变弯矩对内、外螺纹应力幅的影响规律，提出钻铤应力水平对扭矩与弯矩的敏感度量化指标，并构建应力预测敏感度曲线。研究结果表明：大的弯矩载荷将导致钻铤强度失效，螺旋屈曲产生的弯矩（336.3 kN·m）使外螺纹根部应力达993.23 MPa，接近材料抗拉强度，存在瞬时失效风险；扭矩波动（11.3~32.2 kN·m）与交变弯矩（±6.6 kN·m）分别产生11.7 与9.8 MPa局部应力幅，在上扣残余应力的叠加影响下，将引起塑性累积应变，加速疲劳失效；在小弯矩作用下，扭矩波动对疲劳损伤的影响更为显著。研究结果可为万米级超深井钻铤设计、安全作业及断裂预防措施制定提供理论支撑。

Abstract

Drill collar， a key force-transmission component connecting the drill string and the drill bit， is susceptible to instantaneous strength failure and fatigue failure under the extreme loads in wells deeper than 10，000 m， which restrict safe and efficient drilling. To investigate the stress distribution and load sensitivity of drill collar threads in wells deeper than 10，000 m， the torque， drilling fluid pressure， axial load and bending moment of drill collars under service conditions in such wells were calculated， and a three-dimensional solid finite element model of the drill collar featuring the real thread structure was established. The stress distribution characteristics and strength failure mechanism of the external thread root under high bending moments were analyzed， and the stress concentration characteristics of the drill collar during the make-up process and under normal drilling conditions were quantified. The influences of torque fluctuation and alternating bending moment on the stress amplitudes of the internal and external threads were identified， the quantitative sensitivity indexes of drill collar stress levels to torque and bending moment were proposed， and the stress prediction sensitivity curves were constructed. The results show that a large bending moment may cause strength failure of the drill collar. The bending moment （336.3 kN·m） generated by helical buckling makes the stress at the external thread root reach 993.23 MPa， close to the tensile strength of the material， implying a risk of instantaneous failure. The torque fluctuation （11.3-32.2 kN·m） and the alternating bending moment （±6.6 kN·m） produce local stress amplitudes of 11.7 MPa and 9.8 MPa， respectively， which， together with the make-up residual stress， will cause cumulative plastic strain and accelerate fatigue failure. Under small bending moments， torque fluctuation has more significant effect on fatigue damage. The research findings provide theoretical support for the design， safe operation， and failure prevention of drill collars for 10，000-m ultra-deep wells.

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