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Sand production often leads to the failure of production equipment on offshore platform. Therefore, a new idea has been put forward, which is installing cyclone or baffle in the internal of the slug catcher for better sand control. In this paper, an experimental study is presented, which mainly includes sand particles accumulation shape, migration law and separation performance. The results suggest that the accumulation area is mainly divided into two zones: the crowded settlement zone and the free settle-ment zone. The crowded settlement zone has a special shape, which can be characterized by two param-eters: accumulation length and accumulation angle. Axial sampling analysis shows obvious particle classification. Median particle size decreases with the increase of the axial distance, and the range of par-ticle size distribution narrows gradually. The separation experiment shows that the gas velocity has the greatest influence on the separation efficiency. When the gas velocity is 14 m·s-1, the separation effi-ciency drops sharply, which can be abated by installing cyclone separator. In addition, the separation effi-ciency tends to be a constant under different gas velocities by installing baffle with appropriate height. Then the effectiveness and rationality of installing internal components can be strongly proved. All these provide important guidance for maximizing the sand control function of the slug catcher.