弯曲载荷下钻挺接头强度分析与优化设计

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中图分类号：TE921.2 文献标志码：A doi：10.3969/j.issn.1001-3482.2025.05.004

Abstract：To address the failure problemof drill collar thread jointsunder bending loads，the influence of thebending strength ratio of themale and female threadsand the stress relief groove on the bending stress was studied by combining finite element simulation and experimental testing. The research results show that，compared with the structure without a stress relief groove and a bending strength ratio of1.73，the structure with a stress relief groove and a bending strength ratio of 2.15 reduces the stress at the drill collar joint by 56.18% . Increasing the outer diameterof the female thread of the drill collar is more efective in improving the stress than increasing the inner diameter of the male thread flow channel，and the stress relief groove can also efectively improve the stress at the thread joint. The research results provide theoretical basis and technical support for the strength analysis and optimization design of drill collar joints under bending loads.

Key words：drill collar sub;bending strength ratio;stress relief groove;finite element simulation; bending test; optimization design

油气勘探开发地域开始由地表、海洋浅层转向超深地层、海洋深水域、致密油气层等新型油气储层，油气开采的复杂程度和施工难度不断增大[1]。（剩余7159字）