Liner Hanger Support Mechanism for High-Pressure Sealing
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Solution Overview
Problem
Traditional liner hangers face challenges in maintaining sufficient contact pressure with the wellbore tubular ID, especially under high downhole pressures, which can lead to dislodgment or reduced sealing efficiency.
Innovation Solution
The improved liner hanger incorporates a mechanical support structure, such as a sliding sleeve, that moves underneath the expansion section to provide additional internal force and restrain the expansion section and sealing elements from compressing radially inward, thereby maintaining contact pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional liner hangers are used without additional support structures, then the device complexity is low, but the contact pressure between the liner hanger and wellbore tubular ID is insufficient under high downhole pressures
Solution Approach 1:
The mechanical support structure is positioned radially inside the support housing, creating a nested configuration where the support structure is housed within the liner hanger body. This nesting approach provides the necessary internal support to maintain contact pressure while minimizing the overall increase in device complexity by utilizing the existing internal space of the liner hanger.
Solution Approach 2:
The mechanical support structure is designed to be movable from a first position radially misaligned with the expansion section to a second position radially aligned with the expansion section. This dynamic positioning allows the support structure to engage only when needed (during expansion and high-pressure conditions), providing support pressure while maintaining ease of operation and deployment.
2Reliability
If the expansion section is allowed to compress radially inward under high pressure, then the device complexity remains low, but the sealing elements lose contact with the wellbore tubular ID
Solution Approach 1:
The mechanical support structure applies preliminary counter-action by being radially aligned with the expansion section before high-pressure conditions occur. This pre-positioned support structure resists the radial inward compression force that would otherwise cause the sealing elements to lose contact, thereby maintaining sealing efficiency under high downhole pressures.
Solution Approach 2:
The mechanical support structure acts as an intermediary element between the expansion section and the sealing elements. By providing internal support to the expansion section, the support structure prevents the sealing elements from compressing radially inward, thus maintaining their contact with the wellbore tubular ID and ensuring reliable sealing.
3Stress or pressure
If downhole pressure increases, then the natural sealing force decreases, but adding support structures increases device complexity
Solution Approach 1:
The mechanical support structure changes the internal pressure distribution parameters within the liner hanger by providing structured internal support. This support modifies the stress state of the expansion section, allowing it to better resist external downhole pressures while maintaining contact force on the sealing elements, thus addressing high-pressure conditions without excessive complexity.
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 effectively maintains contact pressure between the liner hanger and the wellbore tubular ID even under high-pressure conditions, preventing dislodgment and ensuring reliable fluid sealing.
Implementation Method 1
expandable metal configured to expand in response to hydrolysis to contact an inside diameter (ID) of the liner hanger body
Data Source
AI summary
Provided is a liner hanger, a method, and a well system. The liner hanger, in one aspect, includes a liner hanger body having an expansion section movable from a radially unexpanded state to a radially expanded state in contact with an inside diameter (ID) of a wellbore tubular. The liner hanger may further include a support assembly coupled to the liner hanger body, the support assembly including a support housing, and a mechanical support structure positioned radially inside of the support housing. In one aspect, the mechanical support structure is movable from a first position radially misaligned with the expansion section when the expansion section is in the radially unexpanded state to a second position at least partially radially aligned with the expansion section when the expansion section is in the radially expanded state. The liner hanger, in one aspect, further includes expandable metal coupled to the mechanical support structure.