To solve the centralization problem occurred with the expandable casing in the borehole,a new hoop structure,which can expand in accordance with the expandable casing,is invented.

• 将套管扶正器环箍设计为可随膨胀管的膨胀而连续膨胀结构,成为叠片式可膨胀套管扶正器,解决了膨胀管在井眼内扶正居中的问题。