复合载荷下S135钻杆管体裂纹扩展与结构改进

费根胜; 王从奎; 曾宪林; 唐穗欣; 张义

doi:10.13433/j.cnki.1003-8728.20220131

复合载荷下S135钻杆管体裂纹扩展与结构改进

doi: 10.13433/j.cnki.1003-8728.20220131

1.
武昌理工学院人工智能学院自动化系, 武汉 430223
2.
中国石油川庆钻探工程有限公司川西钻探公司, 成都 610051

基金项目:

重庆市教育委员会科学技术研究项目项目 KJQN201901332

详细信息

作者简介:
费根胜(1979-), 高级工程师, 硕士, 研究方向为井下工具设计开发和有限元仿真计算分析, 120160323@wut.edu.cn

中图分类号: TE938
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- 被引次数: 0
出版历程
- 收稿日期: 2021-09-18
- 刊出日期: 2023-10-25

Crack Propagation and Structural Improvement of S135 Drill Pipe Under Composite Loading

1.
Department of Automation Artificial Intelligence School, Wuchang University of Technology, Wuhan 430223, China
2.
Chuanxi Drilling Company, CNPC Chuanqing Drilling Engineering Company Limited Co., Ltd., Chengdu 610051, China

摘要

摘要: 在轴向、弯曲和扭矩等多种载荷的循环复合作用下, 钻杆管体应力集中部位或材料缺陷处会产生裂纹萌生和疲劳裂纹扩展现象, 导致管体失效甚至断裂。以API S135钢级钻杆管体为研究对象, 通过单轴拉伸试验和裂纹扩展试验测试材料力学性能参数, 建立管体数值仿真模型, 并以管体疲劳失效案例作为验证对象来验证模型可行性。通过裂纹扩展数值模拟发现, 管体内加厚过渡消失区最容易断裂失效, 且载荷循环次数最低; 载荷应力比增大, 可以降低疲劳断裂失效风险。通过对管体内加厚过渡消失区结构改进设计发现: 改进管体内加厚锥部长度和管体外加厚锥部长度对管体最大应力和载荷循环次数改变不大, 而提高管体壁厚t后应力下降显著, 且载荷循环次数提高明显。因此提高管体壁厚t是更为有效的改进方式, 并通过正交实验对结构组合进行分析和优选。
- 钻杆管体 /
- 复合载荷 /
- 裂纹扩展 /
- 结构改进 /
- 数值仿真
Abstract: Under the cyclic compound action of multiple loads, such as axial, bending and torque loads, crack initiation and fatigue crack propagation occur at the stress concentration position or defect of the pipe body, and lead to failure or even fracture of the pipe body. The API S135 steel drill pipe body was taken as the research object, the mechanical properties of the material were tested by using the uniaxial tensile test and crack propagation test, the simulation model for the drill pipe body was established, and the fatigue failure cases of API S135 steel grade drill pipe were taken as the object to verify the feasibility of the simulation model. Through the numerical simulation of crack propagation, it is found that the thickening transition zone inside the pipe body is the most prone to fracture failure, and the load cycle times are the lowest. The increase in load stress ratio can reduce the risk of fatigue fracture. The conclusions are obtained that by improving the structural design of the thickening transition zone in the drill pipe body: the maximum Mises stress and the number of load cycles are slightly affected by modifying the inside and outside thickening cone lengths, the Mises stress decreases significantly and the number of load cycles increases significantly after increasing wall thickness of the drill pipe body, therefore, increasing wall thickness of the drill pipe body is a more effective improved method, and the structural combination is analyzed and optimized by using the orthogonal experiment.
- drill pipe body /
- composite load /
- crack propagation /
- structure improvement /
- numerical simulation

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图 1 井眼造斜段钻杆管体受载情况示意图

Figure 1. Diagram of drill pipe body load in hole deviation section

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图 2 MTS809.25材料动态测试系统

Figure 2. Dynamic test system of MTS809.25 material

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图 3 单轴拉伸试验与仿真应力-应变曲线

Figure 3. The stress-strain curves of uniaxial tensile test and simulation

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图 4 试件疲劳试验与数值仿真对比关系曲线

Figure 4. The comparison curves between fatigue test data and numerical simulation data of a specimen

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图 5 失效钻杆管体形貌

Figure 5. The failed shape of drill pipe body

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图 6 钻杆管体网格模型

Figure 6. The mesh model of drill pipe body

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图 7 工作载荷下钻杆管体受力状态

Figure 7. Stress state of drill pipe body under working load

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图 8 工作载荷下管体应力沿着管体长度变化曲线

Figure 8. The Mises stress curve along the length of drill pipe body under working load

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图 9 管体初始裂纹萌生观测点

Figure 9. The observation points of initial crack initiation of drill pipe body

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图 10 预制裂纹过程

Figure 10. The pre-existing crack process

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图 11 裂纹前缘应力强度因子分布曲线

Figure 11. The distribution curves of stress intensity factor at crack tip

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图 12 不同初始裂纹位置的疲劳寿命与裂纹深度关系曲线

Figure 12. The relationship curves between fatigue life and crack depth at different initial crack locations

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图 13 不同应力比下的疲劳寿命与裂纹深度关系曲线

Figure 13. The relationship curves between fatigue life and crack depth under different stress ratios

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图 14 管体加厚端结构示意图

Figure 14. Diagram of the thickened end structure of the drill pipe body

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图 15 工作载荷下管体最大应力沿壁厚增量变化曲线

Figure 15. Change curves of the maximum Mises stress along incremental wall thickness under working load

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图 16 观测点A和E点处管体疲劳寿命与壁厚增量的关系曲线

Figure 16. The relationship curves between fatigue life and incremental wall thickness at observation points A and E of drill pipe body

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图 17 工作载荷下, 管体最大应力随M_eu伸长量变化曲线

Figure 17. The change curves of maximum Mises stress with M_eu elongation under working load

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图 18 观测点A和E点处管体疲劳寿命与M_eu伸长量之间的关系曲线

Figure 18. The relationship curves between fatigue life and M_eu elongation at observation points A and E of drill pipe body

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图 19 工作载荷下, 管体最大应力随M_iu伸长量变化曲线

Figure 19. The change curves of the maximum Mises stress with M_eu elongation of drill pipe body under working load

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图 20 观测点A和E点处管体疲劳寿命与M_eu伸长量之间的关系曲线

Figure 20. The relationship curves between fatigue life and M_eu elongation at observation points A and E of drill pipe body

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表 1 钻杆管体元素质量分数

Table 1. Drill pipe body element mass fraction %

C	Si	Mn	P	Cr	Mo	Ni	Cu
0.28	0.26	0.80	0.011	0.95	0.39	0.034	0.012

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表 2 API S135钢级钻杆管体几何参数

Table 2. The geometrical parameters of API S135 steel drill pipe body

类别	数值
加厚类型	IEU
外径	139.7 mm
厚度	10.54 mm
焊颈	144.5 mm
钻杆长度	9.8 m

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表 3 管体裂纹扩展材料常数

Table 3. Material constants of drill pipe body′s crack growth

C	M	门槛值Δ K_th/(MPa·mm^1/2)	断裂韧度K_C/(MPa·mm^1/2)
3.9×10^-12	3.6	175	3 517

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表 4 结构参数API标准初始值

Table 4. Initial values of structural parameters of API standard

类别	API标准
管体壁厚t/mm	10.54
管体外加厚锥部长M_eu/mm	63.5
管体内加厚锥部长M_iu/mm	76.2

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表 5 增加壁厚, 观测点A、E循环载荷次数统计表

Table 5. The statistics table of cycle load numbers of observation point A, E with incremental wall thickness

壁厚t/mm	E点循环次数/次	A点循环次数/次
0	90 029	112 537
1	127 568	151 483
2	161 584	213 035
3	224 028	213 035
4	293 574	251 981
5	331 113	290 927
6	368 652	329 873
7	406 191	368 819
8	443 730	407 765
9	481 269	446 711

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表 6 增加M_eu长度, 观测点A、E载荷循环次数统计表

Table 6. The statistics table of cycle load numbers of observation points A, E with incremental length of M_eu

锥部长度伸长量/mm	E点循环次数/次	A点循环次数/次
0	90 029	112 537
25	91 789	114 584
50	95 337	118 135
75	98 327	118 474
100	101 149	119 011

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表 7 管体疲劳寿命随M_iu变化统计表

Table 7. The statistical table of fatigue life of drill pipe body with M_iu change

锥部长度伸长量/mm	E点循环次数/次	A点循环次数/次
0	90 029	112 537
50	91 743	112 713
100	92 389	113 135
150	94 103	113 311
200	95 817	113 487
250	97 531	113 663

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表 8 内加厚过渡消失区结构改进正交实验

Table 8. The orthogonal experiment on improving internal thickened transition vanishing zone structure

序号	t/mm	M_eu/mm	M_iu/mm	应力集中系数
1	3	75	150	1.225
2	3	25	200	1.209
3	3	50	50	1.195
4	3	100	0	1.203
5	4	100	100	1.194
6	4	50	150	1.198
7	3	0	100	1.209
8	5	100	200	1.191
9	4	0	200	1.182
10	4	75	0	1.190
11	5	75	100	1.194
12	4	25	50	1.183
13	6	75	200	1.190
14	5	25	150	1.177
15	6	100	50	1.168
16	5	50	0	1.172
17	6	50	100	1.178
18	5	0	50	1.165
19	7	100	150	1.177
20	7	50	200	1.163
21	6	0	150	1.167
22	7	75	50	1.156
23	6	25	0	1.160
24	7	25	100	1.151
25	7	0	0	1.163

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