An Analytical Method for Predicting Fluid-Structure Interaction Characteristics of Tubing and Casing with Special Threaded Joints

Abstract

The invention discloses an analysis method for predicting fluid-solid interaction characteristics of a special threaded connector oil casing. The analysis method includes the steps that a geometric model of the special threaded connector oil casing and a computational domain of an internal flow field of the oil casing are set up; grid generation is carried out on the structure and the internal flow field of the structure, and the fluid-solid interaction interface between the structure and the internal flow field is set up; the quantitative relation among grid sizes on the interaction interface is considered, the computational difference between a fluid grid and a structure grid is eliminated, a fast and efficient data transmission method is set up, fluid pressure is transmitted to the surface of the structure to perform numerical computation, and computation results are post-processed to obtain the dynamic change process of the structure and the internal flow field of the structure. The fluid-solid interaction effect between the special threaded connector oil casing structure and the internal flow field is fully considered, the computational difference between the interaction interface grids is eliminated, and the credibility of the computation results is improved; the fluid-solid interaction characteristics of the special threaded connector oil casing can be predicted and analyzed really, fast and efficiently, and comprehensive quality of designing the special threaded connector oil casing and the use reliability of the special threaded connector oil casing are improved.

Description

technical field [0001] The invention relates to a special threaded joint oil casing technology for oil pipes, in particular to an analysis method for predicting the fluid-solid coupling characteristics of the special threaded joint oil casing. Background technique [0002] In recent years, the demand for basic energy such as oil and natural gas has increased significantly in various countries. As an important energy transmission medium, oil casing is the main tool for oil and gas exploitation. However, with the continuous increase of pipeline transportation volume and the continuous improvement of pipe diameter, wall thickness and strength, many problems that were originally ignored will appear, such as the impact of the vibration of the internal conveying fluid on the service performance of the pipeline structure, the special thread The influence of joint oil casing on the internal flow field, etc. These problems have put forward higher requirements for the structural des...

AI Technical Summary

Problems solved by technology

For the research on oil casing with special threaded joints, a large number of traditional researches only focus on the structural characteristics of the pipe body or the hydrodynamic analysis inside the pipe body.

However, in actual engineering, the special threaded joint oil casing is in a large-scale fluid-solid coupling system, and the vibration of the pipe body will cause the unsteady flow of the fluid in the inner cavity; in turn, the flow of the fluid in the inner cavity will cause the tube Structural vibration of the body, etc.

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