储气库井注采管柱流体运移规律研究

Study on Migration Rule of Gas Storage Well Injection-production String Fluid

针对储气库井油管弯曲段气蚀严重的问题,利用k-ε湍流模型,通过理想气体状态方程确定了油管内天然气流动的初始条件和边界条件,基于有限元方法,研究了不同注气速度、弯曲角度等对油管任意截面位置处静压、波动压力、速度场分布的影响规律。结果表明:储气库油管内压力波动大小与注采气密度、速度等相关,且与注采气速度平方成正比;在油管弯曲段由于能量的急剧转化导致油管内压力出现波动,而垂直段和水平段内压力变化较为平缓,弯曲段油管B点压力波动程度较A点明显降低,而该截面静压分布则刚好相反,且油管内压与注气速率之间呈现非线性关系。

For the serious cavitations problem of gas storage well bending tubing, using the k-ε turbulence model, the initial and boundary conditions of natural gas flow were determined by the state equation of ideal gas. According to the finite element method, the static pressure, fluctuates pressure, velocity profile at the pipeline＇ s arbitrary section were studied under different gas injection rate, angle of bending. The results showed that the gas storage tubing pressure is induced by the change of fluid density and injection-production speed, and is proportional to the square of the steam injection rate. The tubing pressure fluctuates at the bending section due to the sharp transformation of energy, and the pressures change more gently at the vertical section and horizontal section. The pressure at tubing bending section fluctuations from point A to B significantly decreased, and the cross section of the opposite static pressure distribution, and tubing internal pressure shows non-linear relationship between internal pressure and Key words：