Retrievable Packer Slotted Sleeve Release Mechanism
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Solution Overview
Problem
Conventional retrievable packer systems face issues with hydraulic resistance and debris clogs during the release process, leading to potential damage and failure of release components, especially due to the reliance on snap rings and vent holes that can break under increased force or get clogged with debris.
Innovation Solution
A retrievable packer system with a slotted retrieval sleeve and a flow bypass mechanism that prevents hydraulic pressure resistance by forming fluid connections between the lower cone and packer mandrel, allowing for greater force application without damaging release components, and reducing the risk of debris clogs through multiple slots in the slotted retrieval sleeve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a snap ring is used to release the cone assemblies from the slip devices, then the release mechanism is simple, but the snap ring breaks under increased force and fails to release the slip devices
Solution Approach 1:
The release mechanism is divided into multiple independent components: a release tool with cutting element, a retrievable packer body, and a snap ring. The cutting element segments the stuck packer body, allowing the release tool to exert force on the snap ring without the entire packer structure resisting the release force, thereby preventing snap ring failure while maintaining mechanical simplicity.
2Force
If force is increased to disengage the cone assemblies and slip devices, then the release capability is improved, but the snap ring breaks and fails to release the slip devices
Solution Approach 1:
The cutting element is extracted as a separate functional component on the release tool, positioned to cut the packer body before the release force is applied to the snap ring. This extraction allows the high force needed for release to be applied only to the snap ring after the structural constraint of the packer body has been removed, enabling sufficient release force without exceeding snap ring strength limits.
3Reliability
If a vent hole is provided in the lower connection sleeve, then the hydraulic pressure can be released, but the vent hole gets clogged with debris and creates hydraulic resistance
Solution Approach 1:
The release tool acts as an intermediary mechanism that bypasses the need for hydraulic pressure release through the vent hole. By mechanically cutting the packer body and directly actuating the snap ring release, the system eliminates the intermediate step of hydraulic pressure equalization that requires the vent hole, thereby avoiding debris clog issues while maintaining reliable pressure management.
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 system effectively isolates zones in a wellbore during downhole operations and ensures reliable retrieval by preventing hydraulic resistance and debris-induced failures, allowing for safe and efficient release of the packer system without damaging release components.
Implementation Method 1
A slotted retrieval sleeve and lower cone are provided with flow channels to prevent hydraulic pressure resistance
Data Source
AI summary
The retrievable packer system includes a packer mandrel, a lock ring, an upper cone, a lower cone, a slip device, a retrieval mandrel, and a slotted retrieval sleeve. The lock ring is attached to the packer mandrel, followed by the upper cone, the slip device, the lower cone, and the retrieval mandrel. The upper connection sleeve and the lower connection sleeve cover the packer mandrel so as to form a chamber in fluid connection with slip flow channels of the slip device. The packer system is run into the borehole with the slotted retrieval sleeve in the first position relative to the lower cone and the slip device in the run-in position. The packer system is set and can be locked at a location in the borehole. The slotted retrieval sleeve can push the upper cone to return the slip device to the run-in position for retrieval of the packer system.