Downhole Packer Safety Mechanisms for Premature Setting and Release
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Solution Overview
Problem
Existing packer tools in the oil industry face issues with accidental setting during run-in, unreliable release mechanisms due to shear pins susceptible to failure from temperature and pressure variations, and the risk of premature or unintended tool release, leading to operational inefficiencies and costs.
Innovation Solution
A packer tool with a hydraulic setting mechanism and anti-setting safety device, featuring a piston actuator and annular segments that prevent premature setting, combined with anti-release pins for secure release, allowing for reliable operation and reduced risk of accidental release, enabling efficient tool manipulation and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic setting mechanism with shear pins is used to enable tool setting, then the tool can be set reliably under hydraulic pressure, but the shear pins become susceptible to failure from temperature and pressure variations causing accidental setting or release
Solution Approach 1:
The setting mechanism is divided into two independent safety systems: shear pins for preventing premature setting during run-in, and anti-release pins for preventing unintended release during operation. This segmentation allows each system to address specific failure modes without being affected by all operational variations.
Solution Approach 2:
The anti-release pins are positioned and dimensioned to counteract the harmful effects of temperature and pressure variations before they can cause accidental release. The pins are designed with sufficient strength to resist these variations throughout the tool's operational life, providing preliminary protection against thermal and pressure-induced failures.
2Reliability
If shear pins are used to prevent premature setting, then accidental setting during run-in is prevented, but the pins may fail due to shear forces from jarring or thermal expansion causing unintended release
Solution Approach 1:
The safety system is segmented into shear pins for run-in protection and anti-release pins for operational protection. This division allows each component to be optimized for its specific function, with anti-release pins designed to handle shear forces from jarring and thermal expansion without causing unintended release.
Solution Approach 2:
The anti-release pins are designed with sufficient strength and proper positioning to cushion against shear forces from jarring and thermal expansion before these forces can cause unintended release. The pins act as a protective barrier that absorbs and distributes these harmful forces throughout the operational life of the tool.
3Productivity
If a removable packer design is used to allow tool extraction, then the tool can be retrieved after use, but the release mechanism becomes complex and susceptible to accidental operation
Solution Approach 1:
The release mechanism extracts the anti-release pins from their locked position through rotation, allowing the packer to be removed. This extraction-based release mechanism is simpler than traditional shear pin systems and reduces the complexity of the overall release system while maintaining reliability.
Solution Approach 2:
The anti-release pins are positioned and dimensioned during manufacturing to ensure they remain securely in place during run-in and operation, but can be easily extracted through a simple rotation operation. This preliminary positioning simplifies the release mechanism by eliminating the need for complex actuating systems.
4Ease of operation
If the packer is designed to set under hydraulic pressure, then setting can be controlled remotely, but the system becomes vulnerable to pressure variations causing unintended setting or release
Solution Approach 1:
The anti-release pins are designed to counteract the harmful effects of hydraulic pressure variations before they can cause unintended release. The pins are positioned and dimensioned to resist pressure-induced forces throughout the operational life of the tool, providing preliminary protection against pressure-related failures.
Solution Approach 2:
The anti-release pins act as a protective barrier that cushions against pressure variations before these forces can cause accidental release. The pins are designed with sufficient strength to absorb and distribute pressure-induced forces, protecting the release mechanism from unintended operation.
Data Source
AI summary
A packer tool has safety devices to prevent premature and reverse setting and release operations. The safety devices are independent of shear-pin safety systems. Confined annular segments prevent a setting actuator piston from moving absent tool-setting hydraulic pressure. The setting pressure first moves a cylinder in an opposite direction to unroof the segments allowing them to exit confinement and free the piston to set the packing and the anchor slips. Release safety pins extend radially inward from a packing-holder collar into short slots formed on a mandrel surface, preventing the mandrel from being turned. Previous set motion causes the pins to leave the slots thereby freeing the mandrel to turn only after the tool has been set. A third safety device comprises an expanded ring which is dragged by the release cone during release motion until it lodges in a circumferential groove in the mandrel, locking against reverse movement.