型管柱中的生产堵塞器具有单流阀作用，可方便进行反循环洗井；
The procreative blanking plug of the "Y type" pipe string has check valve function and it can conveniently for reverse circulation well cleanup.
根据现有正反循环洗井转换操作中出现的问题，提出了正反循环洗井快速转换管汇的设计方案。
According to the problems of present direct flushing and indirect flushing transfer operation a design for rapid direct flushing and indirect flushing transfer manifold is pot forward.
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