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针对盐穴储气库单井水溶造腔过程中管柱动力特性开展了初步探讨,认为造腔工程中,管柱在受限空间的自激振动和动力失稳是导致管柱发生严重弯曲或者破损的主要原因。初步分析了无空间约束条件下内外管柱的振动特性,得到了理想条件下管柱临界流速的计算式。计算表明,无约束条件下造腔管柱一般会由于液-固耦联振动而发生动力失稳,而且造腔内管一般会先于造腔外管发生失稳破坏。鉴于问题的重要性和复杂性,还对造腔管柱临界流速全面计算力学模型应考虑的诸因素进行了探讨,初步分析了管道轴力、液体压力、造腔循环方式、管道水平支撑,以及轴向水击和管道横向振动耦合的影响,为进一步结合工程实际开展空间约束条件下造腔管柱动力特性全面分析提出了建议。
In view of the preliminary study on the dynamic characteristics of the pipe string in the single-well salt cavern gas storage, it is considered that the self-excited vibration and dynamic instability of the pipe string in the confined space lead to severe bending of the pipe string or The main reason for damage. The vibration characteristics of the inner and outer columns without space constraint are analyzed preliminarily, and the calculation formula of the critical flow velocity under the ideal conditions is obtained. The calculation shows that the unconformity induced cavitation will generally result in dynamic instability due to the liquid-solid coupling vibration, and the cavity-forming inner tube will generally lose its instability before the cavity-forming outer tube. In view of the importance and complexity of the problem, the factors that should be considered in the comprehensive calculation of the critical flow rate of the cavity string are also discussed. The factors such as the pipeline axial force, the liquid pressure, the cavity circulation mode, the horizontal support of the pipeline, Axial water hammer and pipe transverse vibration coupling, and put forward suggestions for further comprehensive analysis of the dynamic characteristics of the man-made pipe string under space constraints.