Simulation Study on Mechanical Behavior of a Nonmetallic Composite Coiled Tubing with Cable Laying under Tension Load
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摘要:
非金属敷缆复合连续油管在起下及采油过程中因自重而承受拉伸载荷，明确敷缆管在该载荷下的力学行为，可以为敷缆管的安全服役提供指导。采用有限元软件，构建了非金属敷缆复合连续油管的三维数值模型，分析了敷缆管在拉伸载荷下的力学行为及其各结构层的力学响应，探究了敷缆工艺参数（缆线缠绕及分布角度）对敷缆管力学特性的影响。研究表明：在拉伸载荷下，敷缆管所有结构层的应力均因缆线缠绕呈螺旋式分布；敷缆管拉伸至失效时，会经历弹性变形、过渡和屈服变形3个阶段，此时管内缆线处于小塑性均匀变形状态；减小缆线缠绕角度，可以提高敷缆管的弹性模量及其轴向承载能力，但会使敷缆管提前进入过渡阶段，进而发生屈服；缆线分布角度对敷缆管力学特性的影响不大。因此，在生产制造该类敷缆管时应着重考虑管内缆线的缠绕角度，该参数与敷缆管在拉伸载荷下力学性能的相关性较大
Abstract:Nonmetallic composite coiled tubing with cable laying is subjected to tension load due to its self-weight in the process of frequent lifting and lowering of wells for oil extraction, and clarifying the mechanical behavior of the pipe under this load can provide guidance for the safe service of the pipe. A three-dimensional numerical model of nonmetallic composite coiled tubing with cable laying was constructed by finite element software, and the mechanical behavior of the pipe under tension load and the mechanical response of each structural layer were analyzed. The influence of cable laying process parameters, such as cable winding and distribution angles, on the mechanical properties of the pipe was explored. The results indicate that under tension load, the stresses in all structural layers of the pipe with cable laying exhibit a spiral distribution because of cable winding. When the pipe is stretched to failure, it undergoes three stages: elastic deformation, transition stage, and yield deformation. Meanwhile, the cables are in a state of small plastic uniform deformation. Reducing the cable winding angle can enhance the elastic modulus and axial load-bearing capacity of the pipe with cable laying. However, it may cause the pipe to enter into the transition stage prematurely and then yield in advance. The cable distribution angle has a minimal impact on the mechanical properties of the pipe. Therefore, when this type of pipe is manufactured, special emphasis should be placed on the cable winding angle, as this parameter is highly correlated with the mechanical properties of the pipe under tension loads.
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图 1 非金属敷缆复合连续油管结构示意
Figure 1. Structure of nonmetallic composite coiled tubing with cable laying
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图 3 非金属敷缆复合连续油管几何模型
Figure 3. Geometric model of nonmetallic composite coiled tubing with cable laying
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图 4 玻纤带增强层及芳纶绳抗拉层铺放方向及层数
Figure 4. Laying direction and number of layers of glass fiber tape-reinforced layer and aramid rope tensile layer
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图 5 非金属敷缆复合连续油管端部施载示意
Figure 5. Loading on ends of nonmetallic composite coiled tubing with cable laying
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图 6 拉伸80 mm后敷缆管外保护层径向位移分布
Figure 6. Radial displacement distribution of outer protection layer of pipe with cable laying after stretching 80 mm
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图 7 敷缆管轴向伸长量与拉伸载荷的关系曲线
Figure 7. Relationship between axial elongation of pipe with cable laying and tension load
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图 8 拉伸位移80 mm时敷缆管中HDPE结构层的应力分布
Figure 8. Stress distribution of HDPE structural layer in pipe with cable laying after stretching 80 mm
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图 9 拉伸位移80 mm时玻纤带增强层各层的最大应力
Figure 9. Maximum stress of each layer of glass fiber tape-reinforced layer after stretching 80 mm
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图 10 玻纤带增强层Ply-7沿纤维方向的应力分布
Figure 10. Stress distribution of Ply-7 glass fiber tape-reinforced layer along fiber direction
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图 11 拉伸位移为80 mm时芳纶绳抗拉层沿纤维方向的应力分布
Figure 11. Stress distribution of aramid rope tensile layer along fiber direction after stretching 80 mm
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图 12 拉伸位移80 mm时缆线应力的变化趋势
Figure 12. Trend of cable stress variation after stretching 80 mm
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图 13 敷缆管中缆线缠绕角度对敷缆管力学性能的影响
Figure 13. Influence of cable winding angle on mechanical properties of pipe with cable laying
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图 14 缆线缠绕角度对敷缆管各结构层最大应力的影响
Figure 14. Influence of cable winding angle on maximum stress of each structural layer of pipe with cable laying
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图 15 动力缆分布角度对敷缆管力学性能的影响
Figure 15. Influence of distribution angle of power cable on mechanical properties of pipe with cable laying
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图 16 缆线分布角度对敷缆管各结构层最大应力的影响
Figure 16. Influence of cable distribution angle on maximum stress of each structural layer of pipe with cable laying
表 1 HDPE及缆线材料的参数
Table 1 Parameters of HDPE and cable materials
材料 弹性模量/MPa 泊松比 屈服强度/MPa 抗拉强度/MPa HDPE 850 0.45 25.9 纯铜 108000 0.32 220.0 263.04 
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表 2 不同纤维的力学性能参数
Table 2 Mechanical performance parameters of different fibers
纤维 断裂强度/
MPa弹性模量/
GPa延伸率，
%密度/
(t·m−3)泊松比 连续无碱玻璃
纤维1 404 72 2.6 2.60 0.22 Kevlar®29纤维 2 900 60 3.6 1.44 0.19
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