Axial-Radial Collapsible Ring for Gap-Free Wellbore Sealing
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Solution Overview
Problem
Existing expanding and collapsing apparatuses in oilfield devices suffer from extrusion gaps, uneven surfaces, and limited expansion ratios, which compromise sealing effectiveness and anchoring force.
Innovation Solution
A ring structure composed of interlocking elements that move between expanded and collapsed conditions through axial and radial movements, with tangential sliding, ensuring a seamless, high-expansion capability without gaps, and providing a smooth, unbroken surface for enhanced anchoring and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If segmented anti-extrusion rings are used to provide mechanical support, then structural strength is improved, but extrusion gaps are created between segments that compromise sealing effectiveness
Solution Approach 1:
The ring is divided into multiple segments that can expand and collapse independently. Each segment is equipped with its own actuator, allowing precise control of segment positioning to maintain contact with the wellbore wall while minimizing gaps between segments during both expanded and collapsed states.
Solution Approach 2:
The ring structure transitions from a static segmented design to a dynamic system where segments can move radially and axially. The segments are connected via hinges that allow relative movement, enabling the ring to adapt its shape and maintain sealing contact while providing structural support.
2Reliability
If circumferentially lapped segments are used to avoid extrusion gaps, then sealing effectiveness is improved, but the ring creates uneven surfaces that reduce anchoring force and spatial efficiency
Solution Approach 1:
Different regions of the ring structure have different properties: the outer circumference maintains a smooth, even surface for optimal anchoring contact with the wellbore wall, while the inner regions allow segmental movement and articulation for gap minimization. The hinge connections are positioned to preserve outer surface continuity.
3Device complexity
If discrete circumferential distribution of expanding structures is used, then device complexity is reduced, but surface area for anchoring is limited reducing maximum force rating
Solution Approach 1:
The ring structure utilizes both radial and axial dimensions to maximize anchoring surface area. By allowing segments to move in multiple directions and creating a three-dimensional engagement profile with the wellbore wall, the system achieves higher force ratings without proportionally increasing device complexity.
Data Source
Figure 1A~1D
Figure 2A~2D
Figure 3
AI summary
Embodiments described herein provide an expanding and collapsing apparatus and methods of use. The apparatus includes a plurality of elements assembled together to form a ring structure about a longitudinal axis. The ring structure is operable to be moved between an expanded condition and a collapsed condition by movement of the plurality of elements. At least one set of structural elements are operable to move between the expanded condition and the collapsed condition by movement of a first end in an axial direction, and by movement of a second end in a radial dimension. In certain embodiments, the plurality of elements includes at least one set of structural elements extending longitudinally on the apparatus and operable to slide with respect to one another. Applications of the embodiments described herein include oilfield devices, including anti-extrusion rings, plugs, packers, locks, patching tools, connection systems, and variable diameter tools run in a wellbore.