Valve assemblies for high-temperature wells
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Solution Overview
Problem
Valve assemblies designed for hydrocarbon wells are not suitable for high-temperature geothermal wells due to the use of elastomeric materials that fail to function effectively at temperatures above 150°C, leading to the need for specialized valve assemblies that can withstand temperatures up to 600°C.
Innovation Solution
The development of valve assemblies with non-polymeric materials, such as metals, that include sealing assemblies with tortuous flow paths and sequential port opening mechanisms, allowing for high-temperature operation without relying on elastomers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomeric materials are used in valve assemblies for hydrocarbon wells, then sealing effectiveness is improved, but temperature resistance deteriorates at temperatures above 150°C
Solution Approach 1:
The patent changes the material parameter from elastomeric to non-polymeric materials (such as metal seals, graphite, or ceramic-based materials) that can withstand high temperatures up to 600°C while maintaining sealing effectiveness in geothermal well conditions
Solution Approach 2:
The valve assembly employs composite material construction, combining non-polymeric sealing materials with metal components to achieve both high-temperature resistance and effective sealing performance in the harsh geothermal environment
2Temperature
If non-polymeric materials are used in valve assemblies, then temperature resistance is improved, but sealing effectiveness deteriorates compared to elastomeric materials
Solution Approach 1:
The patent modifies the sealing mechanism parameters by using non-polymeric materials with different physical properties (such as metal-to-metal contact seals or graphite-based seals) that maintain sealing capability through mechanical interference or deformation rather than elastic recovery
Solution Approach 2:
The patent introduces intermediary elements such as sealing rings, gaskets, or coating layers made from high-temperature resistant non-polymeric materials that mediate between mating surfaces to prevent fluid leakage while withstanding extreme thermal conditions
3Productivity
If ports are opened simultaneously in valve assemblies, then fluid flow capacity is improved, but control precision deteriorates in sequential operations
Solution Approach 1:
The patent divides the valve assembly into multiple independently controllable port sections, allowing sequential opening and closing of individual ports or groups of ports through separate actuation mechanisms, thereby enabling precise control over fluid flow paths and rates
Solution Approach 2:
The patent implements dynamic control capabilities where the valve assembly can transition between different flow configurations by selectively opening or closing ports in sequence, adapting fluid flow patterns to match varying operational requirements of injection and production stages
Data Source
AI summary
A valve assembly suitable for use in a high temperature well, such as a geothermal well. The valve assembly comprises a tubular housing having ports to allow fluid communication between a fluid passageway in the valve assembly and the outside of the valve assembly, an outer sleeve longitudinally slidable in the tubular housing, and an inner sleeve longitudinally slidable in the outer sleeve. The outer and inner sleeves are slidable to various positions to prevent, allow or restrict flow through the ports. The valve assembly may include sealing assemblies that can withstand high temperatures, frangible plugs in the ports that can be sheared to open the ports, and/or a coupling member for coupling the inner and outer sleeve while the ports are being opened. The valve assembly may have ports configured in a manner that allows for sequential opening of the ports.