https://www.slb.com/zh-cn/products-and-services/innovating-in-oil-and-gas/completions/well-completions/liner-hangers/rbs-rotational-ball-seat
RBS Rotational Ball Seat for Liner Hanger Systems | SLB
The rotational ball seat (RBS) simplifies and saves time on running and setting cemented and uncemented liner hanger systems, and reduces pressure surges.
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