Swellable Material Valve for Shunt Tube Flow Isolation
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Solution Overview
Problem
In gravel packing operations, achieving uniform distribution of gravel is challenging due to premature loss of transport fluid causing bridges, and manmade isolation devices can hinder distribution, leading to undesirable flow paths after the procedure.
Innovation Solution
A swellable material valve is deployed in shunt tubes to selectively block flow by expanding upon contact with a specific substance, such as water or hydrocarbon fluid, ensuring complete gravel packing and preventing further flow through the shunt tubes after the procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical valves are used to close off shunt tubes, then flow through shunt tubes can be blocked, but such valves must be cycled and are limited to shunt tubes of small size
Solution Approach 1:
The patent replaces mechanical valves with a swellable material that responds to chemical or physical stimuli (such as fluid pressure or chemical exposure) to block flow through the shunt tube. This eliminates the need for mechanical cycling and removes size limitations associated with traditional valve mechanisms, allowing the solution to work in shunt tubes of any diameter.
Solution Approach 2:
The swellable material changes its physical parameter (volume/shape) in response to environmental conditions such as fluid pressure or chemical exposure. When exposed to the wellbore environment or specific fluids, the material swells to block the shunt tube passage, providing a passive, automatic flow control mechanism without mechanical intervention.
2Manufacturing precision
If shunt tubes are used to bypass bridges and packers during gravel packing, then complete gravel packing can be achieved, but undesirable flow paths remain after the procedure
Solution Approach 1:
The swellable material is pre-installed in the shunt tube before the gravel packing operation. During the procedure, it remains in a non-blocking state to allow complete gravel distribution through the shunt tube, bypassing bridges and packers as needed. After gravel packing is complete, the material is activated to block the shunt tube, eliminating the harmful flow path before production begins.
Solution Approach 2:
The shunt tube flow path dynamically transitions from open to closed state based on the operational phase. During gravel packing, the swellable material remains collapsed or non-swollen to maintain an open flow path for gravel slurry. After the procedure, the material swells to close the path, adapting the system's flow characteristics to the current operational requirements.
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 swellable material valve effectively blocks flow through shunt tubes, ensuring uniform gravel distribution and preventing unwanted flow paths, thereby enhancing the effectiveness of gravel packing operations.
Implementation Method 1
the swellable material is exposed to a substance that induces swelling, thus blocking further flow through the shunt tube
Data Source
AI summary
A technique is provided to selectively control flow along shunt tubes, such as those used in gravel pack operations. The technique utilizes a swellable material valve that comprises a swellable material deployed along the shunt tube flow path. When flow through a specific shunt tube is no longer desired, the swellable material valve can be exposed to a substance that induces swelling of the swellable material. The expanded or swollen material blocks further flow along the shunt tube.