Because the filters move with the plunger, the sweeping action of the fluid on the downstroke cleans the filters and keeps sand suspended within the production fluid.
因为滤渣器与泵塞是连轴一起移动的，在下冲程期间进入的液体可以起到冲刷作用，利用液体的冲刷来清理滤渣器，使砂粒悬浮于产出液中。
The results of model and simulation can evaluate the range of oil or gas exploitation, and also the area of injected fluid sweeping.
其结果可用于油气采出范围的预测和计算，并为注入井的科学控制和合理布井提供依据。
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