Integral Multistage Safety Valve for Oil Wells
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Solution Overview
Problem
Existing downhole safety valves for oil and gas wells are complex, not compact, and have internal flow passages with non-uniform diameters leading to turbulent flow and pressure drops, with excessive threaded joints increasing the risk of leaks and fabrication costs.
Innovation Solution
A compact, integral multiple stage safety valve design with reduced body joints, featuring dual control lines for independent operation of each valve, a uniform internal flow path, and a constant exterior diameter, minimizing potential leak paths and fabrication costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple safety valves are arranged serially in separate bodies, then redundancy and safety are improved, but the number of body joints increases and reliability decreases
Solution Approach 1:
The patent combines multiple safety valves into a single integrated valve body, eliminating the need for separate bodies and multiple threaded joints. The integrated design maintains all safety functions while reducing the number of potential leak paths and failure points associated with multiple body connections.
Solution Approach 2:
While the valve body is integrated, the patent segments the control system into multiple independent control lines that can operate each valve stage separately. This allows independent operation and testing of each valve while maintaining a unified structural body.
2Ease of manufacture
If threaded joints are used to connect valve components, then assembly and disassembly are facilitated, but the risk of hydrocarbon leaks increases
Solution Approach 1:
The patent minimizes the number of threaded joints by integrating multiple valve stages into a single body. This reduction in joints directly reduces the number of potential leak paths for hydrocarbons while maintaining manufacturability through standardized connection points.
3Ease of operation
If internal flow passages have non-uniform diameters, then valve functionality is achieved, but turbulent flow and pressure drops occur
Solution Approach 1:
The patent applies local quality by providing different flow passage configurations in different valve stages, with each stage having uniform diameter passages optimized for its specific function. The transition between stages is designed to maintain flow uniformity, preventing turbulence and pressure drops while achieving the required valve control functionality.
4Adaptability or versatility
If dual control lines are provided for independent valve operation, then operational flexibility is improved, but device complexity increases
Solution Approach 1:
The patent segments the control system into two independent control lines, each capable of operating specific valve stages independently. This segmentation provides operational flexibility (ability to operate one valve as stand-by or both simultaneously) while keeping each control line relatively simple in design.
Data Source
AI summary
An integral multistage safety valve is designed to provide a second level of protection should a first stage fail. The valve may be used in oil and/or gas wells. The interior portion of the multiphase safety valve is designed so as to reduce turbulence and pressure loss through the valve when the valve is in an open position. The valves may be independently operable, or operable with a single control line. The multi-stage valve reduces the number of body joints required to construct two identical valves thereby reducing cost and potential leak paths and increasing reliability of the system.