Multiple Expandable Metal Packers With Hydrolock Valve Control
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Solution Overview
Problem
Trapped fluid between packers in a wellbore can prevent them from expanding fully, leading to incomplete sealing and potential hydrolock issues during the expansion of multiple packers in oil and gas well applications.
Innovation Solution
A hydrolock prevention valve system with a selectively actuatable valve that allows or blocks fluid flow between packers, automatically transitioning to a closed position when packers are fully expanded to ensure complete expansion and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple packers are expanded simultaneously to isolate regions along the wellbore, then sealing capability is improved, but trapped fluid prevents complete expansion of the packers
Solution Approach 1:
The patent extracts the trapped fluid from the annular space between packers by providing a flow path through the base pipe that allows fluid to escape from the region between the packers during expansion, enabling complete expansion while maintaining sealing capability
Solution Approach 2:
The patent establishes a fluid flow path and valve system in advance before packer expansion, allowing trapped fluid to be removed prior to and during the expansion process, ensuring packers can achieve full expansion without hydrolock
2Manufacturing precision
If a valve system is added to prevent hydrolock by controlling fluid flow between packers, then expansion completeness is improved, but device complexity increases
Solution Approach 1:
The valve system is designed to automatically respond to pressure conditions between the packers, opening to release trapped fluid when pressure exceeds a threshold and closing when pressure is normalized, eliminating the need for external control mechanisms
Solution Approach 2:
The patent uses a pressure-actuated valve mechanism that utilizes the hydraulic pressure of the expansion fluid itself to control valve opening and closing, converting the pressure differential into mechanical valve actuation without requiring additional power sources or control systems
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
Ensures complete expansion and secure sealing of packers by preventing hydrolock, allowing efficient fluid management and reliable operation of well systems.
Implementation Method 1
When fluid under sufficient pressure is directed into a packer cavity between the pipe connectors and between the expandable sleeve and base pipe, the expandable sleeve is deformed
Implementation Method 2
a hydrolock prevention valve system having a valve selectively actuatable to allow or block flow between a first flow passage extending to an annular space between the packers and a second flow passage extending to an annular section outside of the packers
Data Source
AI summary
A technique facilitates improved actuation and use of packers disposed along a well string and placed in a borehole, e.g. a wellbore. A plurality of packers may be disposed along a base pipe, e.g. a production tubing. Each packer has an expandable sleeve which may be expanded into a fully expanded configuration establishing a secure, sealing engagement with a surrounding wall. e.g. a surrounding wellbore wall. Additionally, a hydrolock prevention valve system comprises a valve which may be actuated to allow or block the flow of fluid from an annular region or regions between the packers.