Swellable Packer Seal Element Using Gas-Responsive Polymer
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Solution Overview
Problem
Conventional retrievable packers in subterranean wellbore operations require complex mechanical systems for expansion and contraction, making them difficult to design and implement effectively.
Innovation Solution
A swellable packer assembly using polymers that swell in response to gaseous hydrocarbons, carbon dioxide, hydrogen sulfide, carbonic acid, and hydrochloric acid, allowing for activation and deactivation by exposing the seal element to these gases, facilitating easy expansion and retraction for isolation and retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional mechanical systems are used for packer expansion and contraction, then the packer can be mechanically expanded and retracted, but the design and implementation becomes complex and difficult
Solution Approach 1:
The patent replaces complex mechanical expansion and contraction systems with a chemical swelling mechanism. The packer element is made of swellable polymer material that expands when exposed to specific chemicals (such as water or acids) and contracts when the chemicals are removed or neutralized. This substitution eliminates the need for complex mechanical actuators, pistons, and linkages, thereby simplifying the overall device design while maintaining operational capability
Solution Approach 2:
The patent utilizes changes in the physical-chemical parameters of the packer material itself to achieve expansion and contraction. By selecting polymers with specific swelling properties that respond to chemical environment changes (pH, presence of specific ions), the system transforms the packer's volume and shape through material property changes rather than mechanical actuation. This approach simplifies the device by making the packer element actively responsive to chemical stimuli
2Device complexity
If swellable polymers are used for packer expansion, then the device complexity is reduced, but the ability to withstand high temperatures and pressures may be compromised
Solution Approach 1:
The patent employs composite material structures where the base polymer matrix is combined with reinforcing materials such as aromatic polyamide fibers or other high-temperature resistant components. This composite construction allows the packer to maintain the swelling capability of the polymer while gaining the thermal and pressure resistance of the reinforcing materials. The combination enables the packer to withstand downhole conditions (high temperature and pressure) that would otherwise degrade simple polymer materials
Solution Approach 2:
The patent applies different material properties to different parts of the packer structure. The sealing surfaces utilize swellable polymer for effective sealing, while structural components exposed to high temperature and pressure are made from heat-resistant materials. This localized material selection optimizes each component for its specific functional requirements, ensuring both swelling capability and environmental resistance
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 enables efficient creation and removal of physical barriers in wellbores with a simpler design, maintaining high temperature and pressure isolation while allowing for easy retrieval of the packer assembly, reducing the complexity of tool design and operation.
Implementation Method 1
The swellable packer assembly generally comprises a seal element disposed on a tubular for use with a downhole string. The seal element comprises a swellable polymer designed to swell when contacted with gaseous hydrocarbons (such as methane, ethane and natural gas), hydrogen sulfide, carbon dioxide, carbonic acid and/or hydrochloric acid.
Implementation Method 2
After completion of a job, the packer could be deactivated by removing the source of the gas, allowing the seal element to retract and be removed from the well.
Data Source
AI summary
Swellable packer assemblies for providing a physical barrier inside a wellbore are provided. In one embodiment, the swellable packer comprises at least one seal element disposed on an outer surface of a tubular body portion which swells when contacted with one or more gases, the seal element comprising a polymer derived from a perfluoro vinyl monomer.