As sand plug occurs, stop adding proppants and circulate them out.
出现砂堵，停止加砂，进行循环。
Sand plug always occurred during fracturing in slant well or directional well.
斜井或定向井在压裂过程中，经常因出现砂堵导致施工失败。
A new scroll spring is provided for cleaning the sand filtering passage to prevent sand plug.
通过新颖的防砂涡卷弹簧可在防砂的同时清洁滤砂通道，防止滤砂通道堵塞。
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