并且既能实现循环充填，又能实现挤压充填；必要时打开关门机构可实现二次充填。
It can not only carry out circulation packing, but also realize squeeze packing, and secondary packing can be done by opening the closing mechanism in demand.
针对滨南采油厂疏松砂岩出砂油藏所用皮碗式循环充填防砂工具和卡瓦式充填防砂工具存在的一系列弊端，研制应用了新型无卡瓦胶筒式循环充填工具。
A series of defects exist in the cup circulation pack sand control tools and slip filling sand control tools currently used in Binnan unconsolidated sandstone reservoir.
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