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针对气藏开采中、后期,气井中气体不能有效携带出液体而使液体在井筒中积聚形成“气井积液”的问题,利用地层自身能量作为动力液,将射流器和涡流装置进行有机结合,设计了射流涡流排水采气装置。利用有限元方法建立了射流涡流排水采气装置瞬态模型,分析了流体区域的压力分布、不同工况参数及结构参数的射流涡流排水采气装置携液情况。分析结果表明:随着射流涡流装置入口流体速度的增加,压降呈升高趋势;随着含液率的增加,压降呈升高趋势;螺旋角为70°时,压降较小,排液效果最佳;螺旋槽深4 mm时,排液效果最佳,在5 mm时次之;螺旋槽宽的取值范围为4~6 mm,其中5 mm时排液效果最佳。研究结果可为射流涡流排水采气装置的现场应用提供参考。
In the middle and later stages of gas production, the gas in the gas well can not effectively carry the liquid and the liquid accumulates in the wellbore to form a “gas well liquid” problem. Using the formation’s own energy as the motive fluid, the jet and the eddy current device are organically Combined with the design of jet eddy current drainage gas recovery unit. The transient model of jet swirling drainage and gas recovery unit was established by using the finite element method. The pressure distribution in the fluid zone, the carryover condition of the jet swirling drainage and gas recovery unit with different operating parameters and structural parameters were analyzed. The results show that the pressure drop increases with the increase of the fluid velocity at the entrance of the jet vortex device. The pressure drop increases with the increase of the liquid content. When the helix angle is 70 °, the pressure drop is small, The best liquid effect is obtained when the helical groove depth is 4 mm, and the discharge effect is the best at 5 mm. The helical groove width is in the range of 4 to 6 mm, and the discharge effect is best at 5 mm. The results can provide a reference for the field application of jet eddy drainage gas recovery unit.