沈琛, 刘峻峰. 多周期注采条件下储气库油管的屈曲行为[J]. 油气储运, 2022, 41(2): 185-191. DOI: 10.6047/j.issn.1000-8241.2022.02.008
引用本文: 沈琛, 刘峻峰. 多周期注采条件下储气库油管的屈曲行为[J]. 油气储运, 2022, 41(2): 185-191. DOI: 10.6047/j.issn.1000-8241.2022.02.008
SHEN Chen, LIU Junfeng. Buckling behavior of tubing in gas storage under multi-cycle injection-production[J]. Oil & Gas Storage and Transportation, 2022, 41(2): 185-191. DOI: 10.6047/j.issn.1000-8241.2022.02.008
Citation: SHEN Chen, LIU Junfeng. Buckling behavior of tubing in gas storage under multi-cycle injection-production[J]. Oil & Gas Storage and Transportation, 2022, 41(2): 185-191. DOI: 10.6047/j.issn.1000-8241.2022.02.008

多周期注采条件下储气库油管的屈曲行为

Buckling behavior of tubing in gas storage under multi-cycle injection-production

  • 摘要: 储气库注采井油管是注采气过程的双重通道,因储气库在运行过程中具有注采气量大、运行时间长、强注强采及多周期注采等特点,油管长期处于复杂的力学环境中,极易发生屈曲行为,导致失效风险升高。为此,结合气藏型储气库运行特征,建立多周期注采条件下储气库油管屈曲受力和变形量理论模型,并以某储气库实际注采井为例,开展油管屈曲行为判断与分析。结果表明:①油管在内外压力、温度效应及膨胀压缩力的作用下,会发生屈曲变形,最大屈曲程度可从正弦屈曲发展为螺旋屈曲。②在注气过程中,油管一直受拉力作用,未发生屈曲行为;在采气过程中,油管发生了屈曲行为。③油管沿程温度分布对屈曲行为有重要影响,可适当提高注气时介质温度,以减小油管顶部轴向载荷,从而降低油管失效风险。研究结果对保障储气库注采井安全生产和提高注采油管使用寿命具有工程实际意义。

     

    Abstract: Tubings in injection and production wells of gas storage serve as dual channels in the process of gas injection and production. However, buckling behavior is prone to occur for the tubing in the complicated mechanical environment due to the large volume of gas injection and production, long operation time, forcible injection and production, and multi-cycle injection and production of gas storage, thus increasing the risk of tubing failure. Therefore, a theoretical model of tubing stress and deformation in gas storage under multi-cycle injection-production was established with reference to the operation characteristics of reservoir type gas storage, and the buckling behavior was judged and analyzed for the actual injection and production wells of a Gas Storage. The results show that: i) Buckling deformation may occur to the strings under the combined action of the internal and external pressure, temperature effect, swelling force and compressive force, with the maximum buckling ranging from sinusoidal buckling to spiral buckling; ii) Buckling does not occur to the tubing subjected to tension effect during gas injection, but actually occurs during gas production; iii) As the temperature distribution along the tubing has an important influence on the buckling behavior, the medium temperature can be increased appropriately during gas injection to reduce the axial load on top of the tubing, thus mitigating the risk of tubing failure. The research results are of great significance to the safe production of the injection and production wells in gas storage and the extension of the service life of tubings.

     

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