Integrated Casing Sealing Element for High-Pressure Well Anchoring
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Solution Overview
Problem
Conventional well packers require complex designs and mechanisms for sealing and anchoring, often failing to provide reliable seals in high-pressure, high-temperature environments and are prone to damage during installation due to exposure and mechanical stress.
Innovation Solution
A built-in anchoring and sealing system within the casing string that uses a settable annular sealing element with a locking mechanism, eliminating the need for external packer components and protecting the sealing element from damage, featuring a sealing element that radially expands to form a seal between the casing and an inner tubular member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional packers are used with external packer components and complex mechanisms, then sealing and anchoring functions are provided, but the device complexity increases and reliability decreases in high-pressure high-temperature environments
Solution Approach 1:
The patent combines the sealing element and anchoring features into a single integrated unit that is set within the casing string. The sealing element includes both the sealing component and anchoring components (such as dogs or slips) as part of one unified structure, eliminating the need for separate external packer components. This merging reduces device complexity while maintaining both sealing and anchoring functions, and improves reliability by reducing the number of potential failure points in high-pressure high-temperature environments.
Solution Approach 2:
The sealing element is designed to perform multiple functions simultaneously: it provides sealing against the casing wall, anchoring to prevent movement, and can be set and unset controllably. This multi-functional design eliminates the need for separate dedicated components for each function, reducing overall device complexity while enhancing reliability through a more streamlined system.
2Ease of operation
If conventional packers are exposed during installation, then they can be positioned in the well, but they are prone to damage during installation due to mechanical stress
Solution Approach 1:
The sealing element is pre-assembled and protected within the casing string before being deployed to the well. The anchoring features and sealing components are already in place and protected from mechanical damage during handling and installation. The element is only activated (set) when it reaches the desired position, at which point the protective casing is removed or repositioned, allowing the sealing element to expand and engage without having been exposed to damaging stresses during transport and installation.
3Device complexity
If a simple sealing element design is used, then device complexity is reduced, but the pressure and temperature rating is insufficient for high-pressure high-temperature applications
Solution Approach 1:
The sealing element is constructed using composite materials that combine the properties of elastomers (for sealing) with reinforcement materials such as fabric or wire mesh (for structural strength). This composite construction allows the sealing element to withstand high pressures and temperatures while maintaining a relatively simple overall design. The reinforcement provides the necessary mechanical strength without significantly increasing complexity, enabling the element to meet high-pressure high-temperature ratings.
4Reliability
If external packer components are used for sealing, then sealing function is provided, but the risk of damage during installation increases
Solution Approach 1:
By merging the sealing element and anchoring features into a single integrated unit that is protected within the casing string during installation, the patent eliminates the exposure of external packer components to mechanical damage. The sealing function is maintained through the integrated design, while the protective casing prevents damage during handling and installation, reducing the risk of harmful factors affecting the sealing components.
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 solution simplifies the design and enhances the pressure and temperature rating of the sealing system, making it suitable for high-pressure high-temperature applications while reducing the risk of damage during installation and maintaining a secure seal without the need for external packer components like slips.
Implementation Method 1
a sealing element that has an unset state in which the sealing element has a first radial thickness and a set state in which the sealing element has a second radial thickness that is greater than the first radial thickness to form a seal
Data Source
AI summary
An apparatus includes a casing and a sealing element that is retained in the casing. The sealing element has an unset state in which the sealing element has a first radial thickness and a set state in which the sealing element has a second radial thickness that is greater than the first radial thickness to form a seal between the casing and an inner tubular member.