Packer Anti-Preset Locking Mechanisms
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Solution Overview
Problem
Traditional packer assemblies are prone to premature deployment due to debris and external forces during downhole deployment, which can lead to unintended setting of the packing element before reaching the desired position within the wellbore.
Innovation Solution
Incorporation of locking mechanisms, such as collets and shear devices, in both hydrostatic and hydraulic setting assemblies to prevent accidental deployment until specific pressures are applied, allowing for independent operation of each assembly even when locked, ensuring the packing element is set correctly within the wellbore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional packer assemblies are deployed without locking mechanisms, then the device complexity is reduced, but the reliability of preventing premature deployment deteriorates
Solution Approach 1:
The locking mechanisms (collets and shear devices) are pre-installed in the setting assemblies to prevent premature deployment before the packer reaches the desired position. These locking features are activated only when specific pressures are applied, ensuring the packing element remains secured during deployment.
Solution Approach 2:
The locking mechanisms act as intermediary components between the setting assemblies and the packing element, providing an additional layer of control and protection against accidental deployment caused by debris or external forces during the deployment process.
2Reliability
If locking mechanisms are added to prevent premature deployment, then the reliability of deployment is improved, but the ease of operation deteriorates
Solution Approach 1:
The locking mechanisms are designed to activate automatically in response to specific pressure conditions during deployment. The collets and shear devices engage and disengage based on the applied pressure, eliminating the need for manual intervention or complex control systems to manage the locking features.
3Reliability
If independent operation of hydrostatic and hydraulic assemblies is enabled with locking mechanisms, then the reliability of each assembly is improved, but the device complexity increases
Solution Approach 1:
The packer system is divided into separate hydrostatic and hydraulic setting assemblies, each with its own locking mechanisms (collets and shear devices). This segmentation allows each assembly to operate independently with reliable locking control, while maintaining modular design principles that manage overall system 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
The locking mechanisms effectively prevent premature setting of the packing element, ensuring reliable deployment and engagement with the wellbore casing, providing robust reservoir isolation and production tubing anchoring capabilities.
Implementation Method 1
Some packers may be set using hydrostatic wellbore pressure and applied surface pressure
Implementation Method 2
some packers may also include a hydraulic set contingency with a plug if the hydrostatic unit fails to set
Data Source
AI summary
Disclosed herein are embodiments of a packer assembly and a well system. In one embodiment, a packer assembly includes an inner mandrel; a packing element at least partially surrounding the inner mandrel; a packing element activation sleeve coupled to the packing element; a hydrostatic setting assembly engageable with the packing element activation sleeve; and a hydraulic setting assembly positioned between the packing element and the hydrostatic setting assembly. The hydrostatic setting assembly includes a hydrostatic piston; a hydrostatic prop piston engageable to push the hydrostatic piston to engage the packing element activation sleeve; and a hydrostatic locking mechanism to maintain the hydrostatic piston in a locked position. The hydraulic setting assembly includes a hydraulic piston; a hydraulic locking mechanism coupled to the hydraulic piston; and a hydraulic prop piston engageable with the hydraulic locking mechanism and operable to move the hydraulic locking mechanism between locked and unlocked position.