Optimization of the Structural Design of the Integral Slip of a Soluble Bridge Plug
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摘要:
为提高可溶桥塞整体式卡瓦的锚定效果，以适用于ϕ95.0 mm可溶桥塞的整体式卡瓦为例，对其结构进行了优化设计。通过整体式卡瓦断裂试验和断裂数值模拟发现，在轴向载荷作用下，整体式卡瓦应力槽在其长度1/2处所受应力达到抗拉强度时，卡瓦断裂张开。基于此规律，通过数值模拟将整体式卡瓦的结构优化为采用6个均匀分布的应力槽，应力槽长25.0 mm、厚2.0 mm、宽4.0 mm，距前端25.0 mm、后端10.0 mm。结构优化后卡瓦的断裂力为72 kN，达到了ϕ95.0 mm可溶桥塞坐封时卡瓦断裂力的要求，且数值模拟及断裂试验均表明，结构优化后的整体式卡瓦不再呈C字形张开，其承压能力更强，卡瓦的锚定效果更好。研究结果表明，可溶桥塞整体式卡瓦的结构经优化设计后，其断裂力明显降低，能避免呈C字形张开，其锚定效果得到增强。
Abstract:In order to improve the anchoring performance of the integral slip of a soluble bridge plug, the team took the design of the integral slip suitable for a ϕ95.0 mm soluble bridge plug as an example, and then proposed a structural optimization design.According to the results from fracture experiments and numerical simulation of the integral slip, when the groove length 1/2 and above reach tensile strength under the effect of axial force, the slip fracture opens.Based on this law, the structure of stress groove was optimized by a numerical simulation.The integral slip adopted the form of six stress grooves, the length, thickness and width of stress groove were 25.0 mm, 2.0 mm and 4.0 mm, respectively.The distance from the front end and back end was 25.0 mm and 10.0 mm, respectively.Under this structure, the breaking force of the slip was 72 kN, which met the technical requirements of the slip breaking force when the ϕ95.0 mm soluble bridge plug was sealed.Moreover, numerical simulations and fracture experiments both showed that the integral slip after structural optimization could avoid C-shaped openings, resulting in better pressure bearing capacity and better anchoring performance of the slip.The results also demonstrated that, after structural optimization design, the breaking force of the integral slip of soluble bridge plug experienced an obvious decrease.The integral slip is capable of avoiding a C-shaped opening, which can improve the anchoring performance.
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Keywords:
- soluble bridge plug /
- integral slip /
- structure design /
- numerical simulation
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图 6 材料a和b加工的整体式卡瓦的应力分布
Figure 6. Stress distribution of the integral slip of Material a and Material b
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图 9 锥体反作用力和卡瓦的Mises应力模拟结果
Figure 9. Simulation results of Mises stress distribution of cone reaction force and slip
表 1 材料a和b的力学性能参数
Table 1 Mechanics parameters of Material a and Material b
材料 弹性模量/
MPa泊松比 屈服强度/
MPa抗拉强度/
MPaa 5 615 0.25 201.31 248 b 7 843 0.25 148.00 215 
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表 2 应力槽结构参数
Table 2 Structural parameters of the stress groove
结构 前端距/mm 后端距/mm A 15.0 20.0 B 25.0 10.0 C 30.0
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