1. The shut-off baffle is installed in the casing coupling, one joint above the float collar, used for pumping pressure of first-stage plug.
2. The first-stage plug is used to isolate the first-stage cement and drilling fluid. On the end of displacement, the first-stage plug lands and effects a seal against the shut-off baffle.
3. Featuring streamline shape and filled with lead, the free-fall opening plug can quickly free-fall to the lower sliding sleeve. When pressure is applied to the casing, it can open the circulation ports.
4. The closing plug is used to isolate the sec on d-stage cement and drilling fluid. When run ning to the upper sliding sleeve, it effect a seat in the stage cementer. Pressure is applied to the casing and the circulation ports are closed.
5. The pump-down opening plug is used fore on tenuous cementing operation and in deviated wells. It can open the circulation ports directly 日nd quickly, while the free-fall opening plug needs longer time waiting for falling.
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