Abstract
Three-high gas well is High-production gas well, High-temperature gas well and High-sulfur gas well.In the mining process of three-high gas wells, due to the impact of the role of the fluid and the tubing string fluctuations lead to severe vibration, the role could easily lead to severe vibration column damage. Based on the high gas flow during the mining shaft and column structural characteristics, taking into account the weight of the tubing string, the packer constraints impact characteristics of steel tubing, pre-stressing, the fluid pressure force on the tubing string's vibration characteristics. Established a tubing string vibration equation, and the establishment of the corresponding mass matrix obtained, the stiffness matrix and damping matrix. Lanczos algorithm with inherent characteristics of the pipeline parameters. The modal superposition method to analyze vibration characteristics of the tubing string, to ensure that the calculation speed in the case met the approximate solution of engineering precision, For the three-high gas wells safe, efficient production of effective technical support.
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