S135钻杆接头缺口疲劳行为研究

李皓; 曾德智; 高定祥; 刘飞; 田刚; 施太和

doi:10.11911/syztjs.2019013

S135钻杆接头缺口疲劳行为研究

李皓^1,,
曾德智^1,*, ,,
高定祥²,
刘飞³,
田刚⁴,
施太和¹

1.
油气藏地质及开发工程国家重点实验室（西南石油大学），四川成都 610500
2.
中国石化西北油田分公司石油工程技术研究院，新疆乌鲁木齐 830011
3.
中国石化石油工程技术研究院，北京 100101
4.
中国石油新疆油田分公司工程技术研究院，新疆克拉玛依 834000

基金项目: 国家自然科学基金项目“静载、振动与腐蚀耦合作用下H₂S/CO₂气井完井管柱螺纹密封面的力化学损伤机制研究”（编号：51774249）、中国石化科技重大专项“顺北一区采输关键技术研究与应用”子课题“顺北一区高效采油技术研究”（编号：ZDP17004）联合资助

详细信息

作者简介:
李皓（1988—），男，甘肃陇南人，2011年毕业于兰州城市学院石油工程专业，2018年获西南石油大学油气井工程专业硕士学位，主要从事油气设施腐蚀与防护工作。E-mail：lihao1477024473@163.com

通讯作者:
曾德智，zengdezhi1980@163.com

中图分类号: TE28
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出版历程
- 收稿日期: 2018-05-29
- 修回日期: 2018-12-12
- 网络出版日期: 2019-01-16
- 刊出日期: 2019-06-30

A Study of the Notch Fatigue Behavior of S135 Drill Pipe Joint

1.
State Key Laboratory of Oil & Gas Reservoir Geology and Exploration(Southwest Petroleum University), Chengdu, Sichuang, 610500, China
2.
Research Institute of Petroleum Engineering, Sinopec Northwest Oil Field Company, Urumqi, Xinjiang, 830011
3.
Sinopec Research Institute of Petroleum Engineering, Beijing, 100101, China
4.
Research Institute of Engineering Technology, PetroChina Xinjiang Oilfield Company, Karamay, Xijiang, 834000, China

摘要

摘要:
钻杆接头疲劳失效是钻杆失效的主要形式，因此，为提高钻杆的使用寿命，对S135钻杆接头的疲劳行为进行了研究。根据钻杆接头的受力特征设计了疲劳试样，采用PQ–6型旋转弯曲疲劳试验机和扫描电镜研究了应力集中对S135钻杆疲劳性能的影响。结果表明：S135钻杆疲劳性能对V形缺口具有一定的敏感性；缺口根部半径越小，应力集中系数越大，对疲劳性能的影响越严重，应力集中系数和疲劳强度符合幂函数关系；疲劳裂纹从缺口根部开始萌生，存在许多裂纹源（呈环形排列）；应力相同时，随着应力集中系数增大，缺口根部的撕裂现象减弱，断口变得光滑、平整，疲劳条纹变得细而密。研究结果表明：对钻杆接头螺纹的牙型进行优化设计，可以降低或减缓齿根的应力集中，降低S135钻杆疲劳对缺口的敏感性，提高S135钻杆的使用寿命。
- S135钻杆 /
- 钻杆接头 /
- 缺口疲劳 /
- 应力集中 /
- 断口形貌
Abstract:
Drill pipe joint fatigue is the main form of drill pipe failure. In order to improve the safety fatigue life of drill pipe, the notch fatigue behavior of S135 drill pipe joint has been studied. The fatigue specimens were designed according to the force characteristics of drill pipe joint, and the influence of stress concentration on the fatigue performance of S135 drill pipe was studied by PQ-6 rotary bending fatigue tester and scanning electron microscope. The results showed that the fatigue of S135 drill pipe exhibited certain sensitivity to the V-notch. The smaller the notch root radius, the larger the stress concentration factor, and the more serious impact on the fatigue performance. The stress concentration factor and the fatigue strength are in accordance with the power function relationship. The process is as follows: the fatigue crack starts from the root of notch, and many sources of cracks existed (in annular arrangement). When the stress is the same, the tearing phenomenon at the root of notch weakens with the increase of stress concentration factor, the fracture becomes smooth and flat, and the fatigue fringes become fine and dense. The research results showed that the optimal design of the drill pipe thread joint could reduce or alleviate the stress concentration of the root, reduce the fatigue sensitivity of S135 drill pipe to the notch, and improve the safety by better mapping the fatigue life of S135 drill pipe.
- S135 drill pipe /
- drill pipe joint /
- notch fatigue /
- stress concentration /
- fracture morphology

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图 1 钻杆接头疲劳失效位置

Figure 1. Fatigue failure position of drill pipe joint

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图 2 光滑试样（单位：mm）

Figure 2. Smooth specimen (unit: mm)

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图 3 V形缺口几何特征和参数定义

Figure 3. The geometric feature and parameter definition of V-notch

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图 4 缺口试样（单位：mm）

Figure 4. Notch specimen (unit: mm)

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图 5 光滑试样的等效应力云图

Figure 5. Equivalent stress nephogram of a smooth specimen

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图 6 缺口试样的等效应力云图

Figure 6. Equivalent stress map of notched specimen

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图 7 不同应力集中系数K_t下应力升降示意图

Figure 7. Schematic diagram of stress fluctuation under different K_t

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图 8 应力集中系数与疲劳强度的关系

Figure 8. Relationship between stress concentration factor and fatigue strength

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图 9 不同应力集中程度下的S–N曲线

Figure 9. S–N cures at different stress concentration degrees

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图 10 光滑试样在空气中的疲劳断口

Figure 10. Fatigue fracture of a smooth specimen in air

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图 11 缺口试样在空气中的疲劳断口（K_t=2.23）

Figure 11. Fatigue fracture of notch specimen in air (K_t=2.23)

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图 12 缺口试样在空气中的疲劳断口（K_t=4.11）

Figure 12. Fatigue fracture of notch specimen in air (K_t=4.11)

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图 13 K_t=3.01缺口试样在空气中的疲劳断口

Figure 13. Fatigue fracture of notch sample in air(K_t=3.01)

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表 1 缺口应力集中对S135钻杆疲劳性能影响的试验方案

Table 1 Test Scheme for the Influence of Notch Stress Concentration on Fatigue Behavior of S135 Drill Pipe

组号	试样类型	H/mm	α/（°）	R/mm	K_t	环境
1	光滑				1.00	空气
2	缺口	1.0	90	0.1	4.11	空气（常温）
3				0.2	3.01
4				0.4	2.23
5				0.6	1.93
注：K_t为理论应力集中系数， ${K_{\rm{t}}} = {{{\sigma _{\max }}} / \sigma }$ ； ${\sigma _{\max }}$ 为缺口截面上的最大应力，MPa； $\sigma$ 为缺口截面上的平均应力，MPa^[13]。

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表 2 缺口疲劳系数及缺口敏感性计算结果

Table 2 Calculation results of notch fatigue coefficient and notch sensitivity

试样类型	$\scriptstyle R$ /mm	$\scriptstyle K_{\rm{t}}$	$\scriptstyle S_{{\rm{ - 1}}}^{\rm{e}}/ {\rm{MPa}}$	$\scriptstyle K_{\rm{f}}$	$\scriptstyle q$
光滑	∞	1.00	637.85	1.00	0
缺口	0.6	1.93	341.12	1.87	0.94
	0.4	2.23	303.01	2.10	0.90
	0.2	3.01	237.01	2.69	0.84
	0.1	4.11	184.51	3.46	0.79

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