Slotted Expandable Backup Rings Lock Mandrel

The backup ring is divided into multiple segments with spiral grooves between them, allowing each segment to independently engage with the casing wall while maintaining collective reinforcement of the sealing element. This segmentation enables better distribution of reinforcing force around the circumference.

The backup ring incorporates spiral curved grooves that wrap around the ring structure. These curved features engage with the casing wall in a progressive manner, providing continuous radial support to the sealing element and preventing axial slippage during pressure application.

The backup ring segments with spiral grooves are designed to engage with the casing wall before drilling begins, creating a locking mechanism that prevents mandrel rotation during the drilling or milling removal process. This preliminary engagement eliminates the harmful rotational movement that would otherwise occur.

The spiral grooves in the backup ring create a mechanical interlock with the casing wall that acts as a preventive measure against mandrel rotation. This interlocking structure provides resistance to rotational forces before they can affect drilling efficiency or extend removal time.

The backup ring transitions from a static structure to a dynamic expandable structure that can change its configuration. In the unexpanded state, it maintains a compact form; when expanded, the spiral grooves engage with the casing wall to lock the mandrel position, providing stability only when needed.

The segmented backup ring structure allows the segments to nest together in a compact configuration when not in use, reducing overall complexity. When expanded, the segments separate and engage with the casing wall, providing the necessary locking function without requiring a permanently complex structure.