Sequestration Injection Valve Dynamic Port Alignment
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Solution Overview
Problem
The injection of fluids into subsurface formations at high pressure can cause flashing and cooling, which negatively affects the sequestration injection valve and reduces operational efficiency.
Innovation Solution
A sequestration injection valve design featuring a housing with a flow valve, an injector assembly having a ported inner and outer sleeve, where the sleeves move relative to each other to maintain a constant pressure differential, ensuring the valve remains efficient across varying flow rates by aligning and misaligning ports and utilizing a vent stem with seals and a spring mechanism to control fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high pressure is applied to inject fluids into subsurface formations, then injection efficiency is improved, but fluid flashing and cooling occur which reduce valve efficiency and can cause freezing
Solution Approach 1:
The patent employs dynamic port alignment between the inner and outer sleeves that automatically adjusts based on flow conditions. The sleeves move relative to each other to align or misalign ports, creating a dynamic pressure differential control system that adapts to varying flow rates and pressures, preventing flashing and cooling while maintaining injection efficiency
Solution Approach 2:
The invention changes the pressure differential parameter dynamically by adjusting port alignment. By varying the degree of port alignment between sleeves, the system maintains optimal pressure differential across different operating conditions, preventing fluid flashing and the associated cooling effects that would reduce valve efficiency
2Productivity
If high pressure injection is used, then fluid injection efficiency is improved, but local area cooling occurs which can freeze the valve
Solution Approach 1:
The patent converts the potential harm of pressure drops into a beneficial control mechanism. By using the pressure differential created by dynamic port alignment, the system prevents flashing and cooling before they can cause freezing, turning what could be a harmful pressure variation into a protective feature
3Adaptability or versatility
If the valve operates across varying flow rates, then versatility is improved, but maintaining constant pressure differential becomes more difficult
Solution Approach 1:
The dynamic port alignment system automatically adapts to different flow rates by adjusting sleeve positions. As flow conditions change, the ports align or misalign to maintain the pressure differential, providing both versatility across operating ranges and stability of the critical pressure parameter
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
This design maintains a constant pressure differential, preventing fluid flashing and ensuring the valve operates efficiently, reducing the risk of freezing and extending the service life of seals by ensuring decisive closure and precise control over fluid flow.
Implementation Method 1
a spring mechanism to control fluid flow
Implementation Method 2
a vent stem with seals
Data Source
AI summary
A sequestration injection valve including a housing, a flow valve disposed in the housing, an injector assembly, the assembly having a ported inner sleeve and a ported outer sleeve, the inner sleeve and outer sleeve moveable relative to one another to more align or more misalign the ports in the inner sleeve and outer sleeve. A method for injecting sequestration fluid into a borehole including applying pressure to a flow valve in an injection valve, moving an inner sleeve of an injector assembly with the pressure, and automatically maintaining pressure differential at the injector assembly. A borehole system including a borehole in a subsurface formation, a string in the borehole, and a sequestration injection valve disposed within or as a part of the string.