Study on Perforation Weakening Mechanism of N80 Coiled Tubing and Tool Geometry Optimization

Guofeng Hai; Wei Li

doi:10.62051/ijmee.v8n5.01

Authors

Guofeng Hai
Wei Li

DOI:

https://doi.org/10.62051/ijmee.v8n5.01

Keywords:

Coiled Tubing, Perforation Fishing, Cutter Design, Weakening Mechanism, ANSYS Explicit Dynamics

Abstract

Coiled tubing fishing operation is a major technical challenge in petroleum engineering. Especially for high-strength materials such as N80, conventional direct pulling is often limited by the bearing capacity limit of the tubing. In this study, an innovative fishing process combining perforation weakening and axial fracture is proposed. Based on the finite element method of ANSYS software, the influence of tool geometry on perforation load and residual strength of tubing string is systematically investigated. The explicit dynamics method is adopted to simulate the dynamic process of the punch piercing the pipe wall and fracturing the tubing. Meanwhile, the Johnson-Cook damage model is introduced to characterize the failure behavior of N80 material under complex stress triaxiality. The results show that compared with the circular cutter head, the optimized diamond cutter head reduces the piercing load by approximately 45.3% and the fracture load by about 23%, and induces obvious stress concentration zones on the pipe wall. This research provides a theoretical basis for the design of downhole perforation fishing tools.

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