Simulation method of oil and gas pipeline welding joint inner crack expanding based on fluid and solid magnetic multi-field coupling

Abstract

The invention discloses a simulation method of oil and gas pipeline welding joint inner crack expanding based on fluid and solid magnetic multi-field coupling, and belongs to the technology of oil andgas pipeline welding joint inner crack detection. A leakage magnetism method is utilized to detect serviced pipeline welding joint inner cracks, and the pipeline welding joint inner crack expanding representing and evaluation problem under the effect of fluid and solid magnetic multi-field coupling is solved. The method is characterized by comprising the steps of building a fluid and solid magnetic multi-physics field model of pipeline welding joint inner crack expanding; constructing fluid and solid magnetic multi-field coupling; calculating pipeline welding joint inner crack expanding; conducting grid reconstruction for a computing domain around the pipeline welding joint inner cracks; conducing leakage magnetic field analysis in the progress of pipeline welding joint inner crack expanding; judging whether pipeline welding joints are cracked or not. By means of the fluid and solid magnetic multi-field coupling simulation method, the inner crack expanding degree can be represented, and the danger level of the damage of the pipeline welding joints is judged. By means of the implementation of the method, technical guarantee can be provided for the leakage magnetism method to detectand evaluate the hidden defects of the serviced pipeline welding joint inner cracks, conduct reproductive repairing or replace oil and gas pipelines.

Description

technical field [0001] The invention relates to an out-of-service detection method for recessive defects on the inner wall of pipeline welds in the technical field of oil and gas gathering and transportation engineering, which is used to quantitatively characterize the process of internal crack propagation and the damage degree of pipeline welds, and specifically relates to an oil and gas system based on fluid-solid magnetic multi-field coupling. The invention discloses a simulation method for crack propagation in pipeline welds, which belongs to the crack detection technology in oil and gas pipeline welds. Background technique [0002] As a transportation tool for oil and natural gas, oil and gas pipelines are an important link connecting their production, transportation and sales. Petroleum and natural gas are dangerous chemicals under national key supervision. They are flammable, explosive and toxic substances. Once they encounter leakage and ignition sources, they are pr...

AI Technical Summary

Problems solved by technology

The invention takes the crack on the outer wall of the pipeline weld as the detection object, only involves the coupling between the displacement field and the magnetic field of the pipeline weld structure, and does not involve the detection of cracks in the pipeline weld and the fluid-solid-magnetic multi-field coupling technology

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