The accessories of MSC/HSC stage tool including first stage plug, free-fall opening plug, closing plug, shut-off baffle and pumping-down opening plug. Those plugs are made of rubber or aluminum, and drillable.
1. The shut-off baffle is installed in the casing collar, one joint above the float collar.
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 second-stage cement and drilling fluid. When running to the upper sliding sleeve, it effect a seal in the stage tool. Pressure is applied to the casing and the circulation ports are closed.
5. The pump-down opening plug is used for continuous cementing operation and in deviated wells. It can open the circulation ports directly and quickly, whereas the free-fall opening plug needs longer time waiting for falling.
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