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。
Sand plug always occurred during fracturing in slant well or directional well.
最后为防止液体停止流动导致砂堵排出管，设计了结构独特的沉砂管。
And unique sand-settling pipe is also designed to prevent the sand from plugging the discharging pipe as fluid stops flowing.
分析了曲堤油田防砂及解堵过程中的经验教训及要解决的关键技术问题；
This thesis chiefly analyses the experience and lessons in the course of sand exclusion and plugging removing in quit oilfield.
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