Dual-Piston Packer Setting Apparatus for High-Pressure Wellbore Sealing
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Solution Overview
Problem
In high-pressure fracturing operations, packers in the wellbore face excessive fluid pressure, leading to high setting loads that can damage the sealing elements, and existing technologies lack effective mechanisms to mitigate this issue.
Innovation Solution
A dual-piston packer setting apparatus is introduced, featuring a primary piston and a secondary piston that are initially coupled but detach at higher fluid pressures, reducing the force transmitted to the sealing element and protecting it from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high fluid pressure is applied to set the packer, then the sealing element can be positioned and sealed, but the sealing element may be damaged by excessive setting loads
Solution Approach 1:
The piston assembly is divided into a first piston and a second piston that are initially coupled together. The first piston applies the majority of the setting force to the sealing element, while the second piston provides a portion of the setting force. This segmentation allows the system to distribute the high setting load across multiple components, preventing any single component from being overloaded and damaged while still achieving reliable sealing.
Solution Approach 2:
The coupling between the first and second pistons is designed to be dynamic rather than static. At high fluid pressures during setting operations, the pistons remain coupled to distribute the load. At lower fluid pressures during normal operation, the pistons can decouple, allowing the second piston to move independently and reducing the force transmitted to the sealing element. This dynamic behavior enables the system to adapt to different pressure conditions and protect the sealing element from excessive loads.
2Strength
If a single piston design is used, then the device complexity is low, but the sealing element cannot be protected from high-pressure damage
Solution Approach 1:
The piston assembly is divided into a first piston and a second piston that are initially coupled together. The first piston applies the majority of the setting force to the sealing element, while the second piston provides a portion of the setting force. This segmentation allows the system to distribute the high setting load across multiple components, preventing any single component from being overloaded and damaged while still achieving reliable sealing.
Solution Approach 2:
The second piston acts as an intermediary component between the fluid pressure source and the sealing element. It provides a portion of the setting force during high-pressure operations but can decouple from the first piston at lower pressures, thereby mediating the force transmission to the sealing element and protecting it from excessive loads while maintaining a relatively simple overall structure.
3Force
If the second piston remains coupled to the first piston at all times, then the setting force is maximized, but the sealing element is exposed to excessive forces during high-pressure operations
Solution Approach 1:
The coupling between the first and second pistons is designed to be dynamic rather than static. At high fluid pressures during setting operations, the pistons remain coupled to distribute the load. At lower fluid pressures during normal operation, the pistons can decouple, allowing the second piston to move independently and reducing the force transmitted to the sealing element. This dynamic behavior enables the system to adapt to different pressure conditions and protect the sealing element from excessive loads.
Solution Approach 2:
The system utilizes changes in fluid pressure parameters to control the coupling state between the pistons. At high pressure thresholds, the pistons are coupled to maximize setting force. When pressure decreases below a threshold, the coupling releases, allowing the second piston to move independently. This parameter-based control mechanism automatically adjusts the force transmission to the sealing element based on operating conditions, protecting the sealing element from excessive forces while maintaining effective sealing when needed.
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 dual-piston design allows the packer apparatus to operate effectively in high-pressure fracturing applications without damaging the sealing elements, maintaining the hydraulic seal and improving the sealing performance over time.
Implementation Method 1
providing a fluid at a fluid pressure to the packer apparatus, the fluid pressure causing the packer apparatus to transition from the first configuration to the second configuration
Implementation Method 2
transitioning to the activated configuration involves shearing a shear pin or a shear ring that is mechanically linking the second piston to the first piston
Data Source
AI summary
A packer setting apparatus utilizes a two piston design to set a sealing element of a wellbore packer based on a first level of fluid pressure provided to the packer setting apparatus when positioned downhole within a wellbore. The packer setting apparatus is further configured to maintain the sealing element in the set configuration when the packer setting apparatus is exposed to higher fluid pressure levels that would be experienced as part of wellbore fracturing operation and/or other pressure treatment operations that may be performed on the wellbore where the packer setting apparatus and the sealing element are located.