ball float collar 球形浮箍
casing float collar 套管浮箍
cementing float collar 注水泥浮箍
differential float collar 压差式浮箍
float-collar 浮箍
cement float collar 注水泥浮箍
stab-in cementing float collar 内管法注水泥浮箍
self-filling self-locking float collar 自灌自锁浮箍
collar of float 浮标的环
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