Swellable Polymeric Wellbore Seal with Segmented Swelling Kinetics
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Solution Overview
Problem
Existing wellbore sealing technologies lack a readily deployable seal that requires minimal actuation and fail to control mechanical properties and swelling kinetics effectively using polymeric materials.
Innovation Solution
A wellbore seal comprising a polymeric material with distinct phases, one having a high swelling characteristic and the other a low swelling characteristic, supported by a layer and an inflatable bladder, which expands to seal the wellbore when exposed to formation fluids, allowing controlled deployment and mechanical property retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a swellable seal member is used to seal the annular space, then the sealing capability is improved, but the deployment complexity and actuation requirements increase
Solution Approach 1:
The seal member is divided into multiple segments that can be independently deployed and sealed. Each segment can be actuated separately, allowing for controlled deployment and reduced complexity in the overall sealing system. The segmentation enables selective activation of sealing zones based on specific wellbore conditions.
Solution Approach 2:
The seal member is pre-configured with swelling materials and actuation mechanisms before deployment to the wellbore. The swelling capability is prepared in advance, allowing the seal to automatically expand and seal upon contact with formation fluids without requiring complex real-time actuation systems.
2Reliability
If a polymeric material with high swelling characteristic is used, then the sealing effectiveness is improved, but the control over swelling kinetics and mechanical properties deteriorates
Solution Approach 1:
Different regions of the seal member are assigned different polymeric materials with varying swelling characteristics. Areas requiring rapid sealing use materials with high swelling characteristics, while areas requiring mechanical stability use materials with lower swelling characteristics. This local differentiation enables controlled swelling kinetics and maintained mechanical properties throughout the seal member.
Solution Approach 2:
The seal member is constructed from composite polymeric materials that combine multiple materials with different swelling characteristics and mechanical properties. This composite structure allows for tailored swelling behavior in different zones while maintaining overall mechanical integrity and controllability of the sealing process.
3Reliability
If the seal member is expanded to seal the annular space, then the sealing capability is improved, but the mechanical integrity during expansion deteriorates
Solution Approach 1:
The seal member incorporates dynamic support structures that adapt during expansion. The support structure provides mechanical reinforcement during the swelling and sealing process, then transitions to a relaxed state once sealing is achieved. This dynamic behavior maintains mechanical integrity during expansion while enabling effective sealing.
Solution Approach 2:
The seal member uses composite construction combining swelling polymeric materials with reinforcing support structures. This composite design provides the necessary mechanical strength during expansion while allowing the polymeric material to swell and seal effectively. The support structure prevents excessive deformation and maintains structural integrity throughout the sealing process.
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
The solution provides a reliable, minimally actuated seal with controlled swelling kinetics, effectively isolating sections of the wellbore and maintaining mechanical integrity during expansion.
Implementation Method 1
The seal member includes a material that swells upon contact with a selected fluid
Implementation Method 2
an inflatable bladder, which expands to seal the wellbore
Data Source
AI summary
A seal comprising a polymeric material having a first swelling phase having a first swelling characteristic and a second swelling phase having a second swelling characteristic, the first swelling characteristic is greater than the second swelling characteristic is utilized to seal an upper portion from a lower portion of a wellbore. A wellbore seal tool is further described comprising a swellable layer, a supporting assembly disposed adjacent the swellable layer, and an inflatable bladder.