Buckle Prevention Ring for Downhole Packer Seal Integrity
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Solution Overview
Problem
Packer assemblies in downhole equipment often fail to maintain a seal under high pressure due to buckling, leading to fluid and gas leakage, as existing support structures are not effectively bonded and cannot withstand compressive loads.
Innovation Solution
A buckle prevention ring assembly is introduced, featuring at least one buckle prevention ring bonded to a packing element surrounding a central mandrel, which provides a tight seal between the packer and conduit by distributing packing element material evenly above and below the ring, preventing buckling and ensuring fluid-tight and gas-tight conditions, even under high pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a support structure is used in a packer assembly, then sealing capability is improved, but under high pressure the support structure buckles and causes leakage
Solution Approach 1:
The packing element is divided into multiple segments by the buckle prevention ring, creating separate zones that can independently withstand compressive loads. This segmentation prevents buckling by providing intermediate support points along the packing element length, allowing each segment to maintain structural integrity under pressure while preserving sealing capability.
Solution Approach 2:
The buckle prevention ring assembly combines different materials with complementary properties: the elastic packing element provides sealing through deformation, while the rigid buckle prevention ring provides structural support and buckling resistance. This composite structure allows the system to simultaneously achieve soft sealing contact and hard structural support against compressive loads.
2Device complexity
If a single element packer is used, then device complexity is reduced, but under high pressure the packer buckles towards the inside of the packer
Solution Approach 1:
The single packing element is segmented into multiple zones by the buckle prevention ring, creating a multi-chamber structure. This segmentation adds structural stability by providing intermediate support points that prevent the packing element from buckling inward under high pressure, while maintaining relative structural simplicity compared to multi-element packers.
Solution Approach 2:
The buckle prevention ring acts as an intermediary structural element between the packing element and the packer body. It provides internal support to the packing element, preventing buckling toward the inside of the packer, while allowing the packing element to maintain its sealing function against the conduit wall.
3Ease of manufacture
If support structures are not bonded into place, then ease of manufacture is improved, but under intense pressure the support structures cannot remain in place
Solution Approach 1:
The buckle prevention ring is integrated with the packing element through bonding, creating a unified composite structure. This merging ensures that the support structure remains in place under intense pressure while maintaining manufacturing simplicity, as the bonding can be achieved through standard molding or adhesive processes during packer assembly.
Data Source
AI summary
A buckle prevention ring assembly for use within a conduit, such as casing, having at least one buckle prevention ring may be provided. The buckle prevention ring may be bonded and may provide a fluid and gas tight seal to prevent fluid and gas from leaking out of the casing in a downhole environment.