Abstract
Deep gas wells and gas fields have the characteristics of high pressure. The vibration of the tubing string during the production of gas wells causes the string to be subjected to severe stress and even dynamic fatigue failure. Therefore, this article is based on the dynamic finite element theory, aiming at the characteristics of large-size tubing strings in deep gas wells. The finite element mechanics model and mathematical model of the tubing string vibration of the packer of high-pressure gas wells were established, and the ANSYS software was re-developed. The finite element analysis program for the vibration dynamics of the unbuckled and buckled strings of gas wells was compiled with APDL, and the displacement of the longitudinal vibration of the tubing string of high-pressure gas wells was studied. According to different sizes of tubing strings currently used in deep gas wells and gas fields, simulation calculations are carried out, and the axial impact load and buckling damage laws of the tubing strings of the entire well section under different production rates are obtained. It provides a theoretical basis for the prediction of tubing string vibration law and measures to prevent tubing string vibration.
Highlights
The deep gas well gas field is the main gas field of the “West-East Gas Transmission” project
According to different sizes of tubing strings currently used in deep gas wells and gas fields, simulation calculations are carried out, and the axial impact load and buckling damage laws of the tubing strings of the entire well section under different production rates are obtained
According to the above-mentioned literature research, most of the current researches mainly focus on the lateral vibration and stability of high-temperature and high-pressure gas well test strings and the research and analysis of fluid-solid coupling vibration of high-pressure gas well completion strings, and there is no specific focus on tubing
Summary
The deep gas well gas field is the main gas field of the “West-East Gas Transmission” project. Q Peng [7] et al established an eight-equation model of in-plane vibration of high-pressure gas well production tubing considering natural gas flow rate, pressure, axial force of the tubing string, and gravity. According to the above-mentioned literature research, most of the current researches mainly focus on the lateral vibration and stability of high-temperature and high-pressure gas well test strings and the research and analysis of fluid-solid coupling vibration of high-pressure gas well completion strings, and there is no specific focus on tubing. The longitudinal vibration displacement and alternating stress of the tubing string in high pressure gas wells are studied, and the axial stress change and buckling damage of the tubing string in the entire well section is studied in depth. It is of great significance to the prediction of tubing string vibration and the prevention of vibration hazards
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