Stage collar is a mechanical tool used to complete the cementing operation into two times. Stage collar mainly consists of two-stage coupling (body), first-stage plug, baffle plate, free fall opening plug (it is used when you use the non-continuous process) or pump-down opening plug (it is used when you use the continuous process), closing plug
1. It uses out-closing structure and locking device on the closing sleeve. The lock is reliable after the closing.
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2. The liquid would not occur in the loculum when opening or closing.
3. The I.D. of upper/lower sub should be the same as that of casing, it can protect the body of stage collar from damaging when the bits going down and doing drill-out operation.
4. All the accessories are made of drillable rubber or aluminum material. They have the function of anti-rotation, and can make the drill out easy.
5. You can use the pumping-down plug to carry out continuous process.