Packer Sealing Element Non-Swelling Layer Grooves
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Solution Overview
Problem
Existing swell packers face challenges in controlling the swell rates of sealing materials in wellbore applications, as they are often affected by exposure to hydrocarbon fluids or water, leading to uncontrolled expansion and potential leakage.
Innovation Solution
A swell packer apparatus featuring a vulcanized non-swelling outer layer with strategically cut grooves to expose a portion of the inner swellable sealing element, controlling fluid exposure and swelling rate by limiting the surface area accessible to swelling fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing material is fully exposed to hydrocarbon fluids or water, then the swellable material can expand to provide sealing, but the swell rate becomes uncontrolled leading to potential leakage
Solution Approach 1:
The sealing element has different surface areas with different properties: some areas are covered by the non-swelling barrier layer while other areas are exposed to swelling fluids. This local differentiation allows controlled swelling where needed while preventing uncontrolled expansion in other areas, resolving the contradiction between achieving reliable sealing and controlling swell rate.
Solution Approach 2:
The sealing element surface is segmented into exposed portions and covered portions by the barrier layer. This segmentation allows different regions to perform different functions: exposed regions control the swell rate while covered regions provide structural support and prevent over-expansion, thereby achieving both reliable sealing and controlled swelling.
2Manufacturing precision
If a barrier layer is applied to control swelling, then the swell rate is controlled, but the sealing efficiency decreases due to reduced fluid contact
Solution Approach 1:
The barrier layer is applied locally rather than uniformly across the entire sealing element. This allows the sealing element to have both covered areas (for swell rate control) and exposed areas (for maintaining sealing efficiency through fluid contact), resolving the contradiction between controlled swelling and effective sealing.
3Speed
If the sealing material expands rapidly, then sealing is achieved quickly, but the material may extrude or fail to anchor properly against wellbore walls
Solution Approach 1:
The barrier layer is pre-applied to the sealing element before deployment. This preliminary action controls the initial contact with swelling fluids, preventing rapid uncontrolled expansion that would cause extrusion, while still allowing sufficient swelling to achieve anchoring and sealing against wellbore walls.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the control over swelling rates, improves sealing efficiency, and increases the anchoring capabilities against wellbore walls, reducing the need for additional anti-extrusion measures and maintaining the integrity of the swellable material.
Implementation Method 1
the non-swelling layer is configured to prevent fluid communication between a swelling fluid disposed outside of the non-swelling layer and portions of the outer surface of the sealing element covered by the non-swelling layer
Implementation Method 2
the sealing material may swell in response to exposure to hydrocarbon fluids or to water in the well
Data Source
AI summary
Example apparatuses and methods are described for providing a swell packer apparatus having a vulcanized non-swelling outer layer with a pattern cut into it to expose an inner swellable sealing element. In an example embodiment, the swell packer includes a mandrel having a substantially cylindrical outer surface. A sealing element extends radially around the mandrel and a non-swelling layer circumferentially covers an outer surface of the sealing element. One or more grooves are cut in the non-swelling layer to expose a portion of the outer surface of the sealing element. The non-swelling layer is configured to prevent fluid communication between a swelling fluid disposed outside of the non-swelling layer and portions of the outer surface of the sealing element covered by the non-swelling layer.