The rotational ball seat (RBS) is a ball-type tubing-blockage device that is run in the liner setting string for the COLOSSUS CMT cemented liner hanger system and the COLOSSUS UNC uncemented liner hanger system.
When pressure is required to set hydraulic liner systems, a drop ball is released from the surface and lands on the ball seat contained within the RBS. Increasing the pressure above the predetermined shear value causes the ball seat to shear and rotate down. The ball is released, and a smooth and full ID remains through the tool.
Because the RBS is run in the setting string, it reduces the formation pressure surges and sharp rise in equivalent circulating density that are experienced when conventional liner toe ball seats shear. After the liner hanger has been set and the RBS sheared, a fullbore ID enables normal cementing operations, including the passage of drillpipe wiper plugs.
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