Expandable Sleeve Insulation with Valve Pressure Control
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Solution Overview
Problem
Existing well insulation devices face challenges in maintaining effective sealing under varying pressure and temperature conditions, leading to potential collapse or loss of sealing contact with the well wall, which can result in well integrity issues and ecological damage.
Innovation Solution
An expandable sleeve device with a non-return valve and a three-way valve assembly that switches between initial and final states to ensure consistent pressure balance, preventing membrane collapse and maintaining sealing contact with the well wall, even under pressure differentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an expandable sleeve device is used to insulate the annular space between casing and well wall, then the sealing effectiveness is improved, but the device may collapse or lose sealing contact under varying pressure and temperature conditions
Solution Approach 1:
The expandable sleeve is designed to dynamically adjust its internal volume in response to pressure differentials. When external pressure exceeds internal pressure, the sleeve automatically expands to maintain contact with the well wall, ensuring continuous sealing effectiveness under varying pressure and temperature conditions throughout the well's service life.
Solution Approach 2:
The device utilizes controlled changes in internal pressure parameters to maintain structural stability. By monitoring and adjusting the pressure differential across the sleeve, the system ensures the sleeve remains in a stable expanded state, preventing collapse while adapting to temperature variations and pressure fluctuations during well operation.
2Reliability
If cement is pumped to seal the annular space, then the sealing is improved, but the cementing process may be imperfect due to large well size, horizontal areas, difficult circulation or loss areas
Solution Approach 1:
The invention extracts the sealing function from the traditional cementing process and implements it through a mechanical expandable sleeve device. This sleeve can be deployed independently of cementing challenges, providing reliable sealing in large wells, horizontal areas, and zones with difficult circulation or loss conditions where cementing may fail.
Solution Approach 2:
The expandable sleeve acts as an intermediary sealing mechanism between the casing and well wall, bypassing the limitations of direct cementing. It provides a controllable, reversible sealing solution that can be inflated to appropriate pressures and maintained throughout the well's service life, overcoming cementing imperfections in complex well geometries.
3Object-affected harmful factors
If the annular space is sealed with cement, then protection against corrosion and pollution is improved, but the casing is still subject to very high stresses from hydraulic fracturing pressures
Solution Approach 1:
The expandable sleeve provides dynamic pressure management by allowing controlled communication between annular spaces while maintaining sealing integrity. This dynamic system can accommodate high hydraulic fracturing pressures (over 15,000 psi) by adjusting its expansion state, protecting the casing from both corrosion and extreme pressure stresses simultaneously.
Solution Approach 2:
The device utilizes parameter changes in pressure and volume to manage the interaction between hydraulic fracturing pressures and casing integrity. By controlling the internal pressure of the sleeve and its expansion state, the system protects the casing from corrosive environments while withstanding the extreme stresses of modern hydraulic fracturing operations.
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 device effectively maintains insulation and sealing integrity across varying pressure conditions, preventing membrane collapse and ensuring reliable well integrity and ecological protection.
Implementation Method 1
a non-return valve placed in a passage which connects the internal volume of the casing to the internal volume of the sleeve
Implementation Method 2
means forming a three-way valve adapted to be switched a single time between an initial state in which a link is set up between the internal volume of the casing and the internal volume of the sleeve
Implementation Method 3
supply of pressurised fluid coming from the casing, via a passage passing through the wall of the casing, to expand the sleeve radially towards the exterior
Data Source
AI summary
The invention relates to an insulation device for wells by controlled supply of the internal volume of an expandable sleeve placed on a casing, comprising a non-return valve placed in a passage which connects the internal volumes of the casing and of the sleeve and a three-way valve which switches a single time between an initial state in which a link connects the internal volumes of the casing and of the sleeve to expand the sleeve and a final state in which the link between the internal volumes of the casing and of the sleeve is interrupted, whereas a link is set up between the internal volume of the sleeve and an annular volume of the well, the three-way valve and the non-return valve forming, after switching, two non-return valves mounted in series and in opposite directions on the passage connecting the internal volumes of the casing and of the sleeve.