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To solve the problem of severe erosion caused by sand particles passing through separators during shale gas extraction，a well in Changning Shale Gas Field was taken as an example. Based on FLUENT software，numerical simulation was used to simulate the erosion characteristics of sand particles on the drain valve under different speeds，sand content，particle size，shape coefficient and valve opening. The main factors affecting the erosion characteristics of the drain valve were evaluated to clarify the erosion situation of the drain valve. The results indicate that the erosion damage of the valve disc and throttle hole is the main reason for the failure of the sewage valve. As the valve opening decreases，the pressure difference inside the valve increases exponentially，and the flow velocity is the largest at the valve disc and throttle hole. With the decrease of shape coefficient of sand particles，the erosion of the valve is more severe. Based on sensitivity analysis，the degree of influence of various factors on valve erosion characteristics is: ξl (Speed)=0.73，ξm (Sand particle size)=0.71，ξn (Sand content)=0.70 and ξq (Shape coefficient)=0.67. Therefore，it is recommended to control the fluid flow rate to within 7 m/s by increasing the internal flow area of the valve，improving the sand removal ability of the desander，and preventing larger sand particles (sand particle size>60 μm) from entering the sewage valve. The sand particle size entering the sewage valve should be controlled within 60 μm，which provides an effective means for the evaluation and optimization of on-site equipment.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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