【摘要】 针对深煤层天然气开采过程中井底压力低、井下积液难排出的问题，提出一种有效提升开采效率的途径。利用CFD模拟方法深入分析引射器内部流场，通过对比静态引射器实验与模拟结果，验证模拟方法的可靠性。基于此，对引射器二维结构尺寸进行优化，并开展三维模型仿真计算。同时对比气体和液体作为引射流体时二维和三维模拟结果的差异。静态引射器实验结果与模拟结果高度吻合，证明该模拟方法能够反映引射器内部实际流动情况。当引射气体介质时，二维模拟与三维模拟结果误差在5%以内。当引射流体为液体，引射器内部形成两相流体时，二维与三维模拟结果在数值上出现较大误差，但两相流体引射器二维与三维内部流场的趋势仍然一致。三维计算结果显示：气引射液引射率达169.54%,气引射气引射率为83.84%。该尺寸结构能够有效排出井底气水混合流体，提高开采效率。同时，明确了不同引射流体情况下二维与三维模拟的适用情况及其差异性。更多还原

【Abstract】 To address the issues of low bottom-hole pressure and difficulty in removing accumulated liquid during the extraction of natural gas from deep coal seams, an effective method was proposed to improve extraction efficiency.CFD simulation methods were used to conduct an in-depth analysis of the internal flow field of the ejector.By comparing the results of static ejector experiments with simulations, the reliability of the simulation method was verified.Based on this, the 2D structural dimensions of the ejector were optimized, and 3D model simulation calculations were carried out.At the same time, the differences between the 2D and 3D simulation results when using gas and liquid as the ejector fluid were compared.The static ejector experiment and simulation results highly matched, proving that this simulation method could reflect the actual flow conditions inside the ejector.When the ejected medium is gas, the error between the 2D and 3D simulation results is within 5%.When the ejected fluid is liquid and a two-phase flow forms inside the ejector, significant numerical differences appear between the 2D and 3D simulation results, but the trends of the internal flow fields of the two-phase flow ejector remain consistent in both 2D and 3D simulations.The 3D calculation results show that the gas-entrained liquid entrainment rate reaches 169.54%,and the gas-entrained gas entrainment rate is 83.84%.This structural size can effectively discharge the gas-water mixed fluid at the bottom of the well, improving extraction efficiency.At the same time, the applicability and differences between 2D and 3D simulations under different entrained fluid conditions are clarified.更多还原