In the shale gas vertical separation metering skid, after the shale gas is separated by the gas-liquid separator, the bottom sand-carrying sewage is driven by high pressure, and the high-speed flowing sand particles will cause serious erosion to the sewage valve. Given this problem, taking a production well in the Changning area as an example, the corresponding mathematical model, and a three-dimensional model of blowdown valve is established. Based on FLUENT flow field analysis software, the erosion of the blowdown valve is simulated and analyzed under different pressure, sand particle size, and shape factor, sand particle density, and sewage sediment concentration, and the serious erosion problem of the blowdown system is obtained. Therefore, a new blowdown system improvement scheme is proposed, and the erosion of the blowdown valve after the scheme operation is simulated. The results show that the maximum erosion rate of the improved blowdown valve is 1.024 × 10⁻⁶kg/(s·m²), and the converted annual erosion thickness is 57.4 μm, which is 26.538–61.247 mm compared to the unimproved sewage valve. The corrosion inhibition rate of the sewage system can reach more than 99%. This greatly reduces the erosion rate of the blowdown valve and ensures the safe operation of the equipment.

页岩气垂直分离计量橇中，页岩气经气液分离器分离后，载砂污水被高压驱使，高速流动的砂粒对排污阀造成严重腐蚀。针对这一问题，以长宁地区的一口生产井为例，建立了相应的数学模型，建立了排污阀的三维模型。基于FLUENT流场分析软件，对排污阀在不同压力，沙粒大小，形状因子，沙粒密度和污水沉积物浓度下的侵蚀进行了模拟分析，得出了排污系统严重腐蚀的问题。因此，提出了一种新的排污系统改进方案，模拟了方案运行后排污阀的腐蚀情况。结果表明，改进的排污阀最大冲蚀率为1.024×10^-6 kg /（s·m ²），折算的年侵蚀厚度为57.4μm，相比之下，未经改进的排污阀为26.538-61.247 mm。污水系统的腐蚀抑制率可以达到99％以上。这大大降低了排污阀的腐蚀率，并确保了设备的安全运行。